Skocz do pozycji: 1.

Tytuł:

Effects of the Spin-Dependent Potential fluctuations on Free Exciton Zeeman Splitting of Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se

Autorzy:

Herbich, M.
Mac, W.
Stachow, A.
Twardowski, A.
Tworzydło, J.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1950805.pdf

Data publikacji:

1996-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Magnetoreflectance of free exciton and magnetization in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se (0.0007 < x < 0.12) were measured. The evaluated proportionality factor between the exciton splitting and the magnetization showed a strong concentration dependence. This effect cannot be explained within the mean field approximation and the virtual crystal approximation and it was described within the model including chemical and magnetic disorder.

Źródło:

Acta Physica Polonica A; 1996, 90, 4; 813-816
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Magnetooptical Properties of GaAs:Mn

Autorzy:

Szczytko, J.
Stachow, A.
Mac, W.
Twardowski, A.
Becla, P.
Tworzydło, J.

Powiązania:

https://bibliotekanauki.pl/articles/1952188.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Magnetoreflectance from GaAs:Mn was measured in the free exciton range for B ≤ 5 T and T = 2.0 K. Combining optical results with magnetization data the value for the exchange parameter N$\text{}_{0}$α-N$\text{}_{0}$β =-(2.3 ± 0.6) eV was obtained. Assuming that N$\text{}_{0}$α ≈ +0.2 eV, the ferromagnetic p-d exchange interaction was found with the magnitude N$\text{}_{0}$β ≈ +2.5 eV.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 951-954
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Waveguiding in Thin Films with Quadratic Magneto-Optical Medium

Autorzy:

Pištora, J.
Domański, A.
Bárta, O.
Staněk, F.
Postava, K.
Ciprian, D.
Kopřiva, I.

Powiązania:

https://bibliotekanauki.pl/articles/2014713.pdf

Data publikacji:

2001-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

The waveguiding in thin planar structures with quadratic magneto-optical medium is analysed. The permittivity tensor elements with quadratic magneto-optical constants are specified. From synchronous condition for guided modes in layered system with magnetic ordering the dispersion relation of waveguide is presented. The reflection coefficients for s-polarized light at transversal, longitudinal, and polar configurations as incidence angle function are described. The influence of quadratic magneto-optical effect on the resonant character of the waveguiding term is described in detail. The theory covers the situation in which the optical response of the structure is linear in the amplitude of the incident wave.

Źródło:

Acta Physica Polonica A; 2001, 99, 1; 17-23
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

New Contribution to Faraday and Kerr Magneto-Optical Effects in Ferromagnets

Autorzy:

Vedyayev, A.
Zhuravlev, M.
Lobachev, A.

Powiązania:

https://bibliotekanauki.pl/articles/1030420.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

We consider a new magneto-optic effect based upon spin-orbit interaction of the conducting electrons in ferromagnetic metal with the electric field of plane polarized light wave. We calculated off-diagonal components of conductivity tensor for this mechanism of a.c. conductivity. These components determine the current induced by the light wave in the direction perpendicular to the plane of the light polarization. Numerical evaluation shows that the conductivity for this new effect exceeds the off-diagonal components of conductivity tensor for ordinary magneto-optic effect. The components appear to be still considerably smaller than the diagonal elements of the conductivity tensor.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 523-525
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Magnetooptical Studies of Bulk Diluted Magnetic Semiconductors

Autorzy:

Gaj, Jan

Powiązania:

https://bibliotekanauki.pl/articles/1888049.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls

Opis:

Recent developments in physics of large gap II-VI Diluted Magnetic Semiconductors (DMS) studied by means of magnetooptical methods are reviewed. Applicability of the Heisenberg Hamiltonian to describe the ion-carrier interaction in new DMS materials is discussed. The paper includes anisotropy related phenomena, new type of bound magnetic polarons found in Van Vleck paramagnetic (Cd,Fe)Se and discusses application of magnetic field to study kinetics of Raman cascades in DMS.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 171-178
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Effects of Photoluminescence Polarization in Semiconductor Quantum Well Subjected to In-Plane Magnetic Field

Autorzy:

Semenov, Yu. G.
Ryabchenko, S. M.

Powiązania:

https://bibliotekanauki.pl/articles/2038089.pdf

Data publikacji:

2004-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.-n
78.20.Ls

Opis:

Strong optical polarization anisotropy observed previously in the exciton photoluminescence from [100]-oriented quantum wells subjected to the in-plane magnetic field is described within microscopic approach. Developed theory involves two sources of optical polarization anisotropy. The first of them is due to correlation between ψ-functions phases of electron and heavy hole which arise owing to electron Zeeman spin splitting and joint manifestation of low-symmetrical and Zeeman interactions of heavy holes in an in-plane magnetic field. Other optical polarization anisotropy source stems from the admixture of light-holes states to heavy-holes ones by low-symmetry interactions. The heavy hole splitting caused by these interactions separately and the effects of their interference are analyzed. The domination of C$\text{}_{2v}$ low-symmetry interaction connected with quantum wells interfaces and/or in-plane deformations takes place in relatively low magnetic field. The directions of this perturbation determine main directions of the π-periodical optical polarization anisotropy. The cubic anisotropy of valence band can add the π/2-periodical contribution to the optical polarization anisotropy. In the case of quantum wells with semimagnetic barriers the Zeeman term contribution can reach value, which dominates the C$\text{}_{2v}$ ones, and crossover to polarization connected with magnetic field direction may be observed in low temperature.

Źródło:

Acta Physica Polonica A; 2004, 105, 6; 537-545
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Photoluminescence in Tilted Magnetic Field of Triply Negatively Charged Excitons Hybridized with a Continuum

Autorzy:

Van Hattem, B.
Corfdir, P.
Brereton, P.
Pearce, P.
Graham, A.
Stanley, M.
Hugues, M.
Hopkinson, M.
Phillips, R.

Powiązania:

https://bibliotekanauki.pl/articles/1399086.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.66.Fd
78.20.Ls

Opis:

We analyse the magneto-photoluminescence of triply negatively charged excitons coupled to a continuum of states. The excitonic complex is confined to a Stranski-Krastanow InAs/GaAs quantum dot embedded in a Schottky diode. Different orientations of the magnetic field have been investigated. A modelling of the Coulomb blockade together with the calculation of the electron Fock-Darwin spectrum has allowed us to predict the magnetic fields of anticrossing between the quantum dot energy states and the wetting layer Landau levels. Good agreement between the theoretical model and the experimental results has been obtained.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 798-800
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Changes of FIR Reflectivity of HgSe:Cr in a Magnetic Field

Autorzy:

Hausenblas, M.
Wyder, P.
Witowski, A. M.
Wittlin, A.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1921666.pdf

Data publikacji:

1992-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.30.Fs

Opis:

The results of FIR magnetoreflectivity of HgSe:Cr are presented. They are interpreted using a classical dynamic dielectric function.

Źródło:

Acta Physica Polonica A; 1992, 82, 5; 741-744
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Do the Mixed Crystals HgSeS Exhibit the One-Mode Behavior?

Autorzy:

Szuszkiewicz, W.
Witowski, A. M.
Julien, C.
Balkanski, M.
Dybko, K.
Witkowska, B.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1924226.pdf

Data publikacji:

1992-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.30.Fs

Opis:

The low-temperature far-infrared reflectivity spectra of HgSe and HgSeS are measured and analysed. The results suggest the one-mode behavior of phonon excitations in HgSeS mixed crystals.

Źródło:

Acta Physica Polonica A; 1992, 82, 5; 887-889
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Exciton States in Type-II ZnSe/BeTe Quantum Wells

Autorzy:

Platonov, A. V.
Yakovlev, D. R.
Zehnder, U.
Kochereshko, V. P.
Ossau, W.
Fischer, F.
Litz, Th.
Waag, A.
Landwehr, G.

Powiązania:

https://bibliotekanauki.pl/articles/1968413.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
78.66.Hf

Opis:

We present an optical investigation of novel heterostructures based on beryllium chalcogenides with a type-I and type-II band alignment. In the type-II quantum well structures (ZnSe/BeTe) we observed a strong exciton transition involving an electron confined in the conduction band well and a hole localized in the valence band barrier (both in ZnSe layer). This transition is drastically broadened by the temperature increase due to enhanced exciton-acoustic phonon interaction.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 953-957
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

s,p-d Exchange Constants of ZnFeTe Diluted Magnetic Semiconductor

Autorzy:

Mac, W.
Herbich, M.
Nguyen, The Khoi
Twardowski, A.
Shapira, Y.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1933919.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.70.Gm

Opis:

Reflectance and degree of polarization of reflectance of the free exciton in Zn$\text{}_{1-x}$Fe$\text{}_{x}$Te (x ≈ 0.002) was measured at T = 1.9 K and magnetic field up to 5 T. Combining the exciton splitting with the magnetization data we estimated the exchange constant N$\text{}_{0}$(α-β) = 2.1 eV.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 845-848
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Determination of Exciton Zeeman Splittings in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te from Faraday Rotation Measurements

Autorzy:

Stachow, A.
Nguyen, The Khoi
Gaj, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/1933998.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.35.+z

Opis:

Reflectivity and Faraday rotation measurements were carried out on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals in the complete zinc-blende range of composition 0 < x ≤ 0.71. From a comparison of the results of these two experiments for samples with x ≤ 0.3, we demonstrate that the Faraday angle Θ, measured in limited spectral range, is proportional to the energy splitting of exciton states ΔE, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculate ΔE values also for x > 0.3. This allowed us to find an empirical description of ΔE values for the whole range of compositions as a function of B and x.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 909-912
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Light Propagation in a Magnetic Field: Random Green Matrix Approach

Autorzy:

Pinheiro, F. A.
Rusek, M.
Orłowski, A.
van Tiggelen, B. A.

Powiązania:

https://bibliotekanauki.pl/articles/2037256.pdf

Data publikacji:

2004-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Dd
78.20.Ls

Opis:

We studied the spectral properties of the matrices describing multiple scattering of electromagnetic waves from randomly distributed point-like magneto-optically active scatterers under an external magnetic field B. We showed that the complex eigenvalues of these matrices exhibit some universal properties such as the self-averaging behavior of their real parts, as in the case of scatterers without magneto-optical activity. However, the presence of magneto-optically active scatterers is responsible for a striking particularity in the spectra of these matrices: the splitting of the values of the imaginary part of their eigenvalues. This splitting is proportional to the strength of the magnetic field and can be interpreted as a consequence of the Zeeman splitting of the energy levels of a single scatterer.

Źródło:

Acta Physica Polonica A; 2004, 105, 4; 339-347
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Temperature and Intensity Dependent Faraday Rotation in Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te at CO$\text{}_{2}$ Laser Wavelengths

Autorzy:

Kowałczyk, L.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1891287.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.30.El

Opis:

Faraday rotation in Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.11) has been investigated experimentally over the temperature range from T = 8 K to 250 K using a Q-switched CO$\text{}_{2}$ laser. Due to the exchange interaction between mobile carriers and localized Mn ions, dramatic enhancement of Verdet coefficient at low temperatures has been observed. The values of Verdet coefficient V = 5585 rad T$\text{}^{-1}$ m$\text{}^{-1}$ at 8 K and V = 1745 rad T$\text{}^{-1}$ m$\text{}^{-1}$ at 80 K have been obtained for Hg$\text{}_{0.89}$Mn$\text{}_{0.11}$Te at 10.6 μm. The dependence of Faraday rotation on intensity of laser radiation has been observed. Intensity dependent Faraday rotation shows saturation for high laser power. Intensity induced rotation is qualitatively attributed to the dispersion associated with saturable absorption of laser radiation. The results obtained in this work indicate that Hg$\text{}_{1-x}$Mn$\text{}_{x}$Te is a suitable material for Faraday rotator at CO$\text{}_{2}$ laser wavelengths for high power laser beam.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 429-431
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Mechanisms of the Magneto-Optical Activity of Rare-Earth Ions in Rare-Earth Iron Garnet Single Crystals

Autorzy:

Tsidaeva, N.
Abaeva, V.
Magkoev, T.

Powiązania:

https://bibliotekanauki.pl/articles/1490761.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Gg
78.20.Ls

Opis:

The magnetic and magneto-optical properties of the typical representatives of three rare-earth iron garnets (RIG) groups: with heavy rare-earth elements Yb, Er, Dy, Tb; with elements from the middle of lanthanide series Gd, Sm, and with light rare-earth element Nd are presented. In contradistinction to other work on the Faraday rotation, which were done only at 1152 nm (8696 $cm^{-1}$), here we present FR spectra obtained in the energy region 5500-20000 $cm^{-1}$ with high optical resolution. The investigations have been done at temperatures of 5, 82, 130, 295 K using magnetic field up to 25 kOe applied parallel to the [111] crystallographic axis of the crystals. It has been shown that the contribution proportional to the magnetic field and independent of temperature to the mixing of the ground state multiplets exceeds the paramagnetic contribution in YbIG, ErIG, GdIG, SmIG. In Tb and Dy iron garnets contributions from the two mechanisms have opposite signs, and the paramagnetic mechanism gives the greatest contribution to the Faraday rotation. Nevertheless, the contribution of the diamagnetic mechanism, caused by the influence of the exchange field in the iron sublattices on rare-earth ions, is significant, and it is necessary to take it into account. Anomalously large magneto-optical activity is observed in NdYIG. This is the result of contributions of the same sign and approximately equal in magnitude from the paramagnetic and diamagnetic mechanisms.

Źródło:

Acta Physica Polonica A; 2012, 121, 1; 74-77
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Magneto-Optical and Optical Investigation of the Surface Region of Ion implanted Garnet Films

Autorzy:

Lali, Kalandadze

Powiązania:

https://bibliotekanauki.pl/articles/1387379.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.Cn
78.20.Ls

Opis:

In the present work we have shown the efficiency of complex investigation of the ion implanted garnet surface region by magneto-optical and optical methods. We have investigated the optical and magneto-optical properties of the ion-implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ garnet films. It has shown that ion implantation influences significantly the magneto-optical properties of the garnet films and practically does not change its optical characteristics. We have also determined the spectral dependences of the component of the tensor of dielectric permittivity for the surface of ion implanted (YBiCaSm)₃(FeGeSi)₅O₁₂ ferrite-garnet films before and after implantation process. These calculations let us evaluate the influence of implantation on an electronic energy structure of the surface layer for the sample.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 582-584
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Exciton Magneto-Optical Study on Single Quantum Wells, Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te/Cd$\text{}_{1-x'-y}$Zn$\text{}_{x}$'Mn$\text{}_{y}$Te

Autorzy:

Takeyama, S.
Grabecki, G.
Adachi, S.
Takagi, Y.
Wojtowicz, T.
Karczewski, G.
Kossut, J.

Powiązania:

https://bibliotekanauki.pl/articles/1934045.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.-m
78.20.Ls
78.66.Hf

Opis:

Four-single quantum wells composed of the ternary non-magnetic compounds Cd$\text{}_{0.93}$Zn$\text{}_{0.07}$Te (well width = 13, 19, 40, 90 Å), separated by the quaternary magnetic-compound Cd$\text{}_{0.48}$Zn$\text{}_{0.04}$Mn$\text{}_{0.48}$Te on (100)GaAs substrate were grown by MBE, and exhibited clear and distinctive photoluminescence lines corresponding to each quantum well. Double luminescence peaks with closely spaced within one well were observed from 90 Å and 40 Å quantum wells. Temperature and magnetic-field study revealed characteristic luminescence features associated with a bound exciton near the interface rather than with one monolayer fluctuation.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 945-948
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Autorzy:

Lawrence, I.
Feuilet, G.
Tuffigo, H.
Bodin, C.
Cibert, J.
Rühle, W. W.

Powiązania:

https://bibliotekanauki.pl/articles/1861487.pdf

Data publikacji:

1993-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.66.Hf
78.20.Ls
78.47.+p

Opis:

Carrier tunneling through CdMnTe barriers of different thicknesses is investigated in CdTe/CdMnTe asymmetric double quantum wells. Steady-state photoluminescence at 1.8 K and time-resolved photoluminescence experiments between 10 K and 50 K were performed.

Źródło:

Acta Physica Polonica A; 1993, 84, 4; 637-640
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Large Filling-Factor-Dependent Spin Splitting in Magnetooptic Kerr Effect in GaAs/AlGaAs Multiple Quantum Wells

Autorzy:

Dudziak, E.
Bozym, J.
Pruchnik, D.
Wasilewski, Z. R.

Powiązania:

https://bibliotekanauki.pl/articles/1969050.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
73.20.Dx
78.66.Fd

Opis:

Magnetooptic Kerr effect in GaAs/Al$\text{}_{0.312}$Ga$\text{}_{0.688}$As multiple quantum wells was investigated in the integer quantum Hall regime. The measurements have been performed in magnetic fields up to 14.5 T, at the temperature of 1.8 K. Experimental data indicate the discontinuous behavior of the magnetooptic Kerr effect spectrum as a function of the filling factor. For odd filling factor values ν=3 and 5 we observe the large spin splitting. The effects cannot be explained in the one-particle model.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 291-296
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Magneto-Optical Characteristics of Human Serum

Autorzy:

Surma, M.
Bućko, J.
Bąk, G.
Ciszek, M.

Powiązania:

https://bibliotekanauki.pl/articles/2014394.pdf

Data publikacji:

2000-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Lc
78.20.Ek
78.20.Ls

Opis:

A study of magneto-optical circular birefringence of human serum from healthy subjects and cancer patients was performed. Significant differences in the magnetic field induced change of the natural optical activity of serum from healthy blood donors and neoplasmic patients were noted. The natural optical activity of blood is positive, irrespective of the donor health status, whereas the magnetic field induced (B > 10T) change in the natural optical activity of the serum from cancer patients is negative while that from healthy donors is positive. The value and sign of the characteristic magneto-optical marker of human serum was discovered in a study of the influence of very high magnetic fields on chiral media and interpreted on the basis of the recent developments in the theory of magnetic field induced optical circular birefringence in the media revealing natural optical activity. The blood serum is a chiral medium.

Źródło:

Acta Physica Polonica A; 2000, 98, 5; 533-542
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Magnetized Plasma in Polar Semiconductors

Autorzy:

Wysmołek, A.

Powiązania:

https://bibliotekanauki.pl/articles/2047367.pdf

Data publikacji:

2007-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.Fs
73.20.Mf
78.20.Ls

Opis:

Plasma excitations in metallic n-type GaAs are studied in high-magnetic fields using the method of inelastic light scattering (the Raman scattering). Experimental data are analyzed using a standard, dielectric function theory. The results obtained for samples with a high electron concentration are well understood in terms of longitudinal excitations. A strong interaction of coupled longitudinal optical-phonon-plasmon modes with the collective cyclotron resonance excitations (the Bernstein modes) is observed. In samples with a lower electron concentration, the unexpected feature in the vicinity of the undressed optical phonon is observed at high magnetic fields. This effect is explained in terms of transverse excitations, which would appear in the Raman spectrum due to disorder-activated selection-rule breaking. A field induced metal-insulator transition and magnetopolaron effect on shallow donors in GaAs is shown to be traced with the Raman scattering experiments in samples with the lowest electron concentration.

Źródło:

Acta Physica Polonica A; 2007, 112, 2; 141-152
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Optical and Magnetooptical Properties of Clinical Dextrans

Autorzy:

Koralewski, M.
Reinholz, F.
Karoń, J.
Waraczewski, K.

Powiązania:

https://bibliotekanauki.pl/articles/2047896.pdf

Data publikacji:

2007-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ek
78.20.Ls
81.05.Lg

Opis:

The effect of dextran concentration, pH, temperature, and urea on the conformation of dextran chain in saline solution were studied. Two characteristic concentrations for both dextrans were observed. One with c$\text{}_{1}$≈0.02 g/dL and second with c$\text{}_{2}$∼2 g/dL which may be related with aggregation and overlapping processes of polymer chains, respectively. The mean optical polarizability for dextran polysaccharides were discussed in relation to their radius of gyration. Preliminary results of the Faraday effect dispersion and their temperature dependence is also presented.

Źródło:

Acta Physica Polonica A; 2007, 112, 5; 1119-1124
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Optical Properties of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Crystals near Fundamental Absorption Edge in Transverse Magnetic Fields

Autorzy:

Safonova, L.
Brazis, R.
Narkowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/2041745.pdf

Data publikacji:

2005-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
78.20.Ci
78.20.Ls

Opis:

A simple and convenient model is proposed to elucidate the optical characteristics of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te crystals using experimental data on light reflection in magnetic field. The model is based on the quasi-oscillator concept accounting both for the exciton and fundamental absorption edge contributions. The energy dependencies of refraction index and absorption coefficient are presented for Mn mole fraction x=20% at the magnetic field values up to 5 T.

Źródło:

Acta Physica Polonica A; 2005, 107, 2; 267-270
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Faraday Rotation in Multiple Quantum Wells of GaAs/AlGaAs

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.
Wasilewski, Z. R.

Powiązania:

https://bibliotekanauki.pl/articles/1952529.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
73.20.Dx
78.66.Fd

Opis:

We report on the results of first measurements of the Faraday rotation of modulated n-doped multiple quantum wells of GaAs/Al$\text{}_{x}$Ga$\text{}_{1-x}$As (x = 0.312). The measurements have been performed in the magnetic fields up to 13 T at the temperature of 2 K, in the spectral region of interband transitions. A rich structure of magneto-excitons has been found in the measured spectra. Faraday rotation (phase) measurements are proposed as an alternative method to photoluminescence excitation for investigations of magneto-excitons in quantum wells. The dependence of the measured Faraday rotation on magnetic field and hypothetical connections with quantum Hall effect are also discussed.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 1022-1026
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Weak Ferromagnetism of Fe Intercalated Fullerides

Autorzy:

Byszewski, P.
Diduszko, R.
Baran, M.

Powiązania:

https://bibliotekanauki.pl/articles/1929859.pdf

Data publikacji:

1994-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
76.70.Hb
78.55.Kz

Opis:

The magnetic properties of C$\text{}_{60}$Fe$\text{}_{x}$ resemble spin glass with the freezing onset above 200 K. The unusual magnetization behavior at intermediate temperatures is ascribed to bonds reorganization.

Źródło:

Acta Physica Polonica A; 1994, 85, 2; 297-302
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Far-Infrared Narrow-Band Photodetector Based on Magnetically Tunable Cyclotron Resonance-Assisted Transitions in Pure n-Type InSb

Autorzy:

Dmowski, L. H.
Cheremisin, M.
Skierbiszewski, C.
Knap, W.

Powiązania:

https://bibliotekanauki.pl/articles/1968062.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
72.40.+w
78.90.+t

Opis:

We present the possibility of using magnetic field to enhance responsivity and to tune spectral range of far-infrared InSb detector (based on photoconductivity effect) beyond its standard range limited to about 30 cm$\text{}^{-1}$. We show that due to cyclotron resonance assisted transitions we can use it as a tunable detector working up to energies about 180 cm$\text{}^{-1}$ (22 meV). We have used such a detector as a spectrometer for measurements of the Landau emission from GaAs emitter.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 733-736
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Transient Photoreflectance of DMS: Thermo-Magnetic Modulations and Magnetic Relaxation

Autorzy:

Scalbert, D.

Powiązania:

https://bibliotekanauki.pl/articles/1968991.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.50.Pp
78.47.+p

Opis:

Optical pump-and-probe experiments performed at the nanosecond timescale on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te are reviewed. Recent studies have established that for low excitation densities thermo-magnetic modulations of the reflectivity prevail against other possible modulations. Hence the relaxation time of the signal directly reflects the spin relaxation of the Mn ions. Detailed studies of the modulation mechanisms give the opportunity to investigate some fundamental magneto-optical properties of the diluted magnetic semiconductors, otherwise beyond reach, such as the paramagnetic shift of the gap in the dilute regime.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 177-187
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Magnetophotoconductivity Due to Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Sadowski, M. L.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1890653.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.-w

Opis:

The paper concerns investigations of shallow centres in semi-insulating (SI) GaAs samples. A very sensitive measuring method - magnetophotoconductivity due to intra-shallow-donor transitions - was used. We report the behaviour of intra-impurity transitions as well as an additional structure in low magnetic fields for different far-infrared wavelengths (70.6 μm, 96.5 μm, 118.8 μm, 163 µm). The results are discussed in terms of a fluctuating potential from ionized centres in SI GaAs. The physical mechanism responsible for the low magnetic field structure is proposed.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 291-294
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Magnetotransmission Measurements of Intra-Shallow-Donor Transitions in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Kożuchowski, K.
Grynberg, M.

Powiązania:

https://bibliotekanauki.pl/articles/1920976.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.Ls
78.50.Ge

Opis:

In this paper we present the results of an investigation of the 1s-2p$\text{}_{+}$ intra-shallow-donor transition by means of an extremely difficult magnetotransmission experiment performed on semi-insulating GaAs. We report the temperature dependence of the transition intensity. We noticed the absence in the absorbance spectra of a well-pronounced structure which is observed at low magnetic fields in photoconductivity measurements. The results are discussed in terms of a fluctuating potential from ionized centres in semi-insulating GaAs.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 617-619
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Spin-Lattice Relaxation of CdMnTe, Measured with a Pick-up Coil in a High Magnetic Field

Autorzy:

Strutz, T.
Witowski, A.
Wyder, P.

Powiązania:

https://bibliotekanauki.pl/articles/1927546.pdf

Data publikacji:

1991-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
78.20.Ls
78.47.+p

Opis:

The spin-lattice relaxation (SLR) time of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te with x=0.008 is measured directly under electron spin resonance condition in a magnetic field of 8.9 T, using a pick-up coil. The SLR times are measured for different sample temperatures between 3.0K and 35K and compared with data of a more diluted sample with x=0.002. The SLR times are shorter than expected for single spin SLR. Moreover, the temperature dependence of the SLR time does not show any of the characteristic behaviours for single spin SLR. Thus, the observed SLR times are explained by cross relaxation of single spins with spin clusters.

Źródło:

Acta Physica Polonica A; 1991, 79, 1; 149-153
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Exchange Parameters of CdCrS Semimagnetic Semiconductor

Autorzy:

Herbich, M.
Mac, W.
Twardowski, A.
Ando, K.
Demianiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/1968099.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.70.Gm
78.30.Fs

Opis:

Free exciton magnetoreflectance and magnetization of Cd$\text{}_{1-x}$Cr$\text{}_{x}$S (0.0024 < x < 0.0031) were measured at T = 2.0 K and magnetic field up to 5 T. Combining the heavy hole exciton splitting with the magnetization data the exchange integral N$\text{}_{0}$β = +0.46±0.04 eV was evaluated within the framework of mean field approximation.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 774-776
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Temperature Dependence of Energy Gap of Highly Concentrated Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te(0.6 < x ≤ 1.0) Epilayers

Autorzy:

Stachow, A.
Mac, W.
Nguyen, The Khoi
Twardowski, A.
Karczewski, G.
Janik, E.
Wojtowicz, T.
Kossut, J.

Powiązania:

https://bibliotekanauki.pl/articles/1934002.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.40.Fy
75.25.+z
78.20.Ls

Opis:

The temperature dependence of the energy gap of MBE grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (0.6 < x ≤ 1.0) was measured for 2 K ≤ T ≤ 200 K and B ≤ 5 T. The results are interpreted in the frames of the model predicting that the exchange contribution to the band edge shift is proportional to the product of the magnetic susceptibility and the temperature.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 913-916
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

The Relaxation of Mn Pairs in CdMnTe at High Magnetic Fields

Autorzy:

Strutz, T.
Witowski, A. M.
Wyder, P.

Powiązania:

https://bibliotekanauki.pl/articles/1890763.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.30.-v
78.20.Ls
78.47.+p

Opis:

The spin-lattice relaxation in CdMnTe at 4.7 K has been measured at high magnetic fields up to 24.5 T. At fields, where the ground state of nearest-neighbor exchange coupled Mn pairs changes due to energy level crossing, an increase in the relaxation rate is observed. This is attributed to the change of relaxation of nearest-neighbor Mn pairs. It proves that not only large size Mn clusters are involved in the relaxation as it has been shown previously, but also Mn pairs. It shows as well that the mixing of pair states is quite effective.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 313-316
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Infrared Spectroscopy of GaAs Doped with Mn

Autorzy:

Rutkowska, A.
Wasik, D.
Witowski, A.
Sadowski, M.
Orłowski, W.
Strzelecka, G.
Hruban, A.
Kamińska, M.
Twardowski, A.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2044531.pdf

Data publikacji:

2005-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.70.Ej
78.20.Ls
78.30.Fs

Opis:

We found that the fine structure related to Lyman spectra of [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] centers in GaAs was present only for samples with low Mn concentration. Such samples, at low temperature, did not show any hopping conductance within Mn impurity band. Magnetooptical measurements revealed that magnetic field induced splitting of the Lyman optical transitions was larger than Zeeman splitting observed for typical shallow acceptors in GaAs, like Be, Zn, and C. This experimental result proved that in the case of Mn acceptor impurity, the exchange coupling of a hole and the S = 5/2 Mn$\text{}^{2+}$(d$\text{}^{5}$) core could not be neglected, which was in accordance with the [Mn$\text{}^{2+}$(d$\text{}^{5}$) + a hole] model of the neutral Mn center in GaAs.

Źródło:

Acta Physica Polonica A; 2005, 108, 5; 845-849
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Carrier Tunneling in High Magnetic Fields

Autorzy:

Christianen, P. C. M.
Bruggink, I. E. M.
Maan, J. C.
Van Der Vleuten, W.

Powiązania:

https://bibliotekanauki.pl/articles/1933728.pdf

Data publikacji:

1995-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.20.Ls
71.35.+z

Opis:

A magnetic field induced coupling is observed between the Landau levels with different quantum number of two GaAs quantum wells separated by a thin (Ga,Al)As tunnel barrier using magneto-photoluminescence-excitation spectroscopy. This coupling cannot be due to a resonance between single particle energy levels, and therefore an explanation is proposed in terms of the Coulomb interaction of magneto-excitons across the thin barrier.

Źródło:

Acta Physica Polonica A; 1995, 88, 4; 691-694
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Density of States for Ballistic Electrons in Electric and Magnetic Fields

Autorzy:

Zawadzki, W.
Kubisa, M.

Powiązania:

https://bibliotekanauki.pl/articles/2011136.pdf

Data publikacji:

1999-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.-b
73.40.Hm
78.20.Ls

Opis:

The density of states for ballistic electrons in the presence of an electric field of almost arbitrary shape is calculated for one, two, and three dimensions using the semiclassical quantization in a finite sample. The semiclassical results are compared with these of the complete quantum treatment for a constant electric field. The case of crossed electric and magnetic fields is also considered and it is demonstrated that in this configuration the density of states exhibits a transition between magnetic and electric types of motion. Implications of this transition for the quantum Hall effect are mentioned.

Źródło:

Acta Physica Polonica A; 1999, 96, 5; 603-612
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

The Optical Method of Determining the Point Symmetries

Autorzy:

Malinowski, S.

Powiązania:

https://bibliotekanauki.pl/articles/1887979.pdf

Data publikacji:

1991-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.16.-d
78.20.Bh
78.20.Jq
78.20.Ls

Opis:

The present symmetry theory of optical phenomena makes it possible to determine each of 122 point symmetry groups both for non-dispersive as well as dispersive media. This is achieved by considering the symmetry breaking effect external fields (separately E and H) on the propagation of electromagnetic waves. The corresponding results are collected in Tables I-III. The way of measuring the relevant physical quantities is proposed. The point symmetry of a given sample is obtained by comparing the experimental results with their theoretical counterparts. The results given in Tables I-III can also be viewed as the discussion of the "canonical" solutions (effects) for a given symmetry K.

Źródło:

Acta Physica Polonica A; 1991, 80, 1; 61-79
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 38.

Tytuł:

Magnetooptical Analysis of Interface Mixing in Pulsed Laser Evaporation and Epitaxy Grown CdTe/Cd$\text{}_{0.9}$Mn$\text{}_{0.1}$Te Multiple Quantum Well and Superlattice

Autorzy:

Lewalski, A.
Nguyen, The Khoi
Kossacki, P.
Gaj, J. A.
Dubowski, J. J.

Powiązania:

https://bibliotekanauki.pl/articles/1929672.pdf

Data publikacji:

1993-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.20.Ls
75.50.Pp

Opis:

A recently proposed magnetooptical method of determination of interface mixing was applied to CdTe/CdMnTe superstructures grown by pulsed laser evaporation and epitaxy. Diffusion length were found ≈ 5 Å for a multiple quantum well and > 15 Å for a superlattice. Ranges of Mn mole fractions and well width values enabling efficient application of the method were determined.

Źródło:

Acta Physica Polonica A; 1993, 84, 3; 571-574
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Quantum Dots - Theory for Experiments

Autorzy:

Jacak, L.
Krasnyj, J.
Wójs, A.

Powiązania:

https://bibliotekanauki.pl/articles/1967993.pdf

Data publikacji:

1997-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
71.35.Ji
78.20.Ls

Opis:

A simple model based on the effective-mass method and treating a quantum dot as a small irregularity of the periodic crystal field is developed and used for the description of the radiative recombination of an exciton captured in that quasi-zero-dimensional structure. The additional peaks appearing in the photoluminescence spectra at the critical quantum dot size are predicted as a consequence of the metastable excited states occurring in the energy spectrum of a confined exciton. The obtained dependence of the photoluminescence spectrum on the dot size and magnetic field reproduces well the available experimental results.

Źródło:

Acta Physica Polonica A; 1997, 92, 4; 633-640
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Magnetotransport and Magnetooptics of InAs$\text{}_{1-x}$Sb$\text{}_{x}$ and Heterojunctions Combinations Formed Between InAs and GaSb, AlSb Or InAs$\text{}_{1 -x}$Sb$\text{}_{x}$

Autorzy:

Stradling, R. A.

Powiązania:

https://bibliotekanauki.pl/articles/1968244.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.My
76.40.+b
78.20.Ls

Opis:

Cyclotron resonance and interband measurements are reported in magnetic fields up to 160 T for InAs/InAs$\text{}_{1-x}$Sb$\text{}_{x}$ superlattices, one of which is a "self-organised" or "natural" superlattice, and InAs$\text{}_{1-x}$Sb$\text{}_{x}$ epilayers. The samples were grown by MBE at temperatures between 370°C to 500°C. No dependence of the band gap, effective masses or g-values on the growth temperature was detected. Anomalous tilt behaviour was observed for the superlattices. Inversion asymmetry induced spin-splitting of the subbands in gated InAs quantum wells is investigated by means of the Shubnikov-de Haas effect and cyclotron resonance. The non-parabolicity was well fitted by Kane theory, although the measured values of effective mass were substantially higher than predictions. Infrared life time measurements at wavelengths between 6 and 85 microns are undertaken with free electron lasers on InAs/InAs$\text{}_{1-x}$Sb$\text{}_{x}$ superlattices and InAs/AlSb quantum wells. Suppression of the Auger recombination times is demonstrated with the superlattices.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 851-865
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Persistent Spin Resonance of Donor Electrons and Hopping Magnetoconductivity in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$

Autorzy:

Wojtowicz, T.
Semaltianos, N.
Kłosowski, P.
Dobrowolska, M.
Furdyna, J. K.
Miotkowski, I.

Powiązania:

https://bibliotekanauki.pl/articles/1890647.pdf

Data publikacji:

1991-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.25.Jd
72.20.My

Opis:

The first observation of electric dipole spin resonance of donor electrons in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ in far-infrared magnetotransmission is reported. Modification of the donor wave function due to non-diagonal exchange interaction with localized magnetic moments and to magnetic fluctuations are believed to allow this resonance. Hopping magnetoconductivity studied in the same crystals shows a behavior typical for wide gap diluted magnetic semiconductors.

Źródło:

Acta Physica Polonica A; 1991, 80, 2; 287-290
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Magnetic Polaron Formation in Semimagnetic Semiconductor Heterostructures

Autorzy:

Yakovlev, D. R.

Powiązania:

https://bibliotekanauki.pl/articles/1947113.pdf

Data publikacji:

1996-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.35.+z
75.50.Rr

Opis:

We present a survey of experimental and theoretical studies of exciton magnetic polarons in semimagnetic semiconductor epilayers, quantum wells and superlattices. The emphasis is on dynamical aspects of magnetic polaron formation in systems of different dimensionality.

Źródło:

Acta Physica Polonica A; 1996, 90, 4; 703-714
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Photovoltaic Effect of ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions in Presence of Magnetic Field

Autorzy:

Gałązka, R. R.
Nguyen, The Khoi
Khoi, Le Van
Dobrowolski, W.
Witkowska, B.
Mycielski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1933917.pdf

Data publikacji:

1995-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

Photovoltaic effect of the ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions, prepared by vapor-transport epitaxy of ZnTe on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate was studied. The photovoltaic measurements were carried out over the temperature range from 12 K to 300 K and in the magnetic field up to 6 T. In the magnetic field, maximum of the sensitivity corresponding to the energy of the forbidden gap of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate splits into two components for σ$\text{}^{+}$ and σ¯ circular polarizations of incident light. This phenomenon was ascribed to the exchange interaction of the magnetic moments of Mn$\text{}^{++}$ ions with band electrons. From the value of the splitting energy the exchange integral N$\text{}_{0}$(α-β) was determined to be 1.15 ± 0.2 eV.

Źródło:

Acta Physica Polonica A; 1995, 88, 5; 841-844
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Magneto-Optic Periodic Strip Structures

Autorzy:

Ciprian, D.
Pištora, J.

Powiązania:

https://bibliotekanauki.pl/articles/2014935.pdf

Data publikacji:

2001-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Fx
78.20.Ls
75.70.-i

Opis:

The paper deals with the optical response from periodic lamellar magnetic structure consisting of permalloy strips on Si substrate covered by Cr protection layer. The ultrathin structure is magnetized in polar geometry and the spectral dependence of magneto-optic response is computed using rigorous coupled wave analysis. The results are compared with the data obtained from magneto-optical ellipsometry experiments. Further model computation helps to understand the basic features of the Kerr rotation spectra and reveal the possible reason of deviation between the experimental data and the model computation.

Źródło:

Acta Physica Polonica A; 2001, 99, 1; 33-46
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Magnetooptical Studies of CdTe-Rich Epitaxial Layers

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.
Jędral, L. Z.

Powiązania:

https://bibliotekanauki.pl/articles/1890795.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
72.40.+w
78.20.Ls

Opis:

The first magnetooptical studies comprising magnetoreflection, magnetoabsorption and Faraday rotation of CdTe-rich Hg$\text{}_{1-x-y}$Cd$\text{}_{x}$Mn$\text{}_{y}$Te are reported. The drastic disappearing of excitonic structure, for already very small Hg content, has been observed. The exchange parameters close to those for CdMnTe have been found.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 325-328
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Magnetooptical Properties of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n Junctions

Autorzy:

Khoi, Le Van
Karczewski, G.
Dobrowolski, W.
Kossut, J.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1891332.pdf

Data publikacji:

1991-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

The first experimental evidence of the magnetic quantum oscillation in the photovoltaic effect of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n junctions is reported. The p-n junctions were obtained in Pb$\text{}_{1-x}$MnxSe crystals with manganese content, 0 ≤ x ≤ 0.08 by introducing Cd donors by diffusion. Measurements were per formed between 5-85 K and in the presence of the magnetic field 0-7 T in the Faraday and Voigt configurations of the incident infrared radiation of various photon energies in the vicinity of the energy gap of a Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se. Strong oscillatory behavior of the photovoltage was observed as a function of the magnetic field intensity at a constant wavelength of the incident light. Using the model of Adler of the energy band structure modified by the exchange terms, and after identification of the initial and final states of the transitions, we derive the band parameters of the Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se crystals.

Źródło:

Acta Physica Polonica A; 1991, 80, 3; 445-448
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Magnetooptical Studies of Quasi-Two-Dimensional Electron Layer on HgCdMnTe

Autorzy:

Dudziak, E.
Bożym, J.
Pruchnik, D.

Powiązania:

https://bibliotekanauki.pl/articles/1877146.pdf

Data publikacji:

1995-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.30.+y
78.20.Ls
72.40.+w

Opis:

Photovoltaic magneto-spectroscopy was used for the first time as the interband probe in the study of the 2D electron gas on narrow-gap HgCdMnTe semiconductor. The strong circular dichroism was found which agrees with the phenomenological description of the optical properties of the 2D electron systems in quantized Hall regime. The model of coupled intersubband resonances and interband transitions was proposed as a qualitative explanation.

Źródło:

Acta Physica Polonica A; 1995, 87, 2; 563-566
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Photo-Induced Relaxation of Magnetization in Molecular Magnet

Autorzy:

Zieliński, P.
Tracz, P.
Podgajny, R.
Pełka, R.
Bałanda, M.
Wasiutyński, T.
Sieklucka, B.

Powiązania:

https://bibliotekanauki.pl/articles/1814014.pdf

Data publikacji:

2007-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Xx
75.60.-d
78.20.Ls

Opis:

The experimental study of photo-induced magnetization of hybrid molecular magnet containing cobalt(II) and tungsten(V) magnetic centers bridged by 4,4'-bpy and $CN^-$ is presented. The observed increase in magnetization rate is attributed to the defects due to inter-valence transfer between $Co^{II}W^V$↔ $Co^{III}W^{IV}$. The time evolution of magnetization is parameterized by the power law rather than exponential function.

Źródło:

Acta Physica Polonica A; 2007, 112, S; S-183-S-188
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Magneto-Optical Study Toward Discrimination of Iron Mineral in Human Tissues

Autorzy:

Koralewski, M.
Żurawski, J.
Langkammer, C.
Karoń, J.
Haybaeck, J.

Powiązania:

https://bibliotekanauki.pl/articles/1030495.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.15.-v
87.64.Ni
78.20.Ls

Opis:

Magnetic optical rotatory dispersion (MORD) of thin selected biological tissues and thin film of composite made from akaganeite mineral and PVA as well as ferritin and their mimetics aqueous suspensions were performed in spectral range 250-650 nm at room temperature. Good correlation between MORD spectra for akaganeite composite film, ferritin and their mimetics aqueous suspensions with spectra of thin slices of human tissue obtained from white matter of the brain and spleen were observed. Comparison suggest a contribution from Fe(III) to MORD spectra of tissues. This preliminary results show that application of MORD spectroscopy to clinical analysis may be useful.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 742-744
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 50.

Tytuł:

Anisotropic Magnetic Properties of MilledBearing Steel Surface

Autorzy:

Mičica, M.
Blažek, D.
Hadzima, B.
Pištora, J.
Neslušan, M.

Powiązania:

https://bibliotekanauki.pl/articles/1192261.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.60.Ej
78.20.Ls

Opis:

For many reasons, the steel surfaces are machined to obtain required physical properties. Suitable methods are required for the management and control of the manufacturing processes, which are simultaneously sufficiently robust and sensitive. The non-destructive testing methods, sensitive to the magnetic properties of the surface, are very suitable for this purpose. The Barkhausen noise (BN) measurement, which reveals the discontinuous movement of the magnetic domains in the thin surface layer during magnetisation reversal process is very robust, while magneto-optical Kerr effect (MOKE) method, using polarized light for orientation measurements of magnetic domains at the surface, is very sensitive and provides detailed information about hysteresis curves (HC) of the materials. In this contribution our results obtained on the milled 100Cr6 bearing steel are presented. These properties were obtained by MOKE laboratory measurements and bring very interesting facts about the magnetisation reversal process, which depends on the orientation of the magnetic field with respect to the cutting direction. Our results clarify the strong anisotropy of BN, which is observed during the industrial application of this method.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1421-1423
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 51.

Tytuł:

Two-Dimensional Optical Imaging of Artificial Magnetic Field in the Laboratory

Autorzy:

Li, X.
An, N.
Feng, X.
Bai, J.

Powiązania:

https://bibliotekanauki.pl/articles/1400280.pdf

Data publikacji:

2013-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.25.Ja
42.30.-d
78.20.Ls

Opis:

Two-dimensional images of the artificial magnetic field created by permanent magnets were obtained by means of the Faraday magnetic rotation effect. This provides a convenient and effective means to observe and measure macro-scale magnetic field, as well as lays a base for three-dimensional optical imaging of magnetic field. The magnetic field imaging here can also be considered as a key part of the magnetic rotation geomagnetic field imaging method which we put forward before, and will provide experimental support for this method.

Źródło:

Acta Physica Polonica A; 2013, 123, 1; 34-38
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 52.

Tytuł:

Magnetic Birefringence Study of the Magnetic Core Structure of Ferritin

Autorzy:

Koralewski, M.
Pochylski, M.
Mitróová, Z.
Melníková, L.
Kováč, J.
Timko, M.
Kopčanský, P.

Powiązania:

https://bibliotekanauki.pl/articles/1428622.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
87.15.-v
87.85.jf

Opis:

Magnetically induced optical birefringence (Δ n) was measured for magnetoferritin and horse spleen ferritin aqueous suspensions. The Δ n for magnetoferritin was described in the frame of the Langevin formalism taking into account distribution of core diameter. The established average magnetic dipole moment and core diameter is equal to about 460 $μ_{B}$ and 3 nm, respectively. It was shown that magnetic birefringence and the Cotton-Mouton constant can be powerful parameters in identification of the magnetic core structure of ferritin, especially useful in biomedicine.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1237-1239
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Ellipsometric Selective Sensitivity to Magnetic Nanostructures

Autorzy:

Hamrlová, J.
Postava, K.
Životský, O.
Hrabovský, D.
Pištora, J.
Švec, P.
Janičkovič, D.
Maziewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1534105.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
75.50.Bb
75.60.-d

Opis:

Recently, we have shown that the approach of depth sensitivity of magneto-optic ellipsometry can be generalized to selectivity from different materials in nanostructures. We use the condition number as the figure of merit to quantify the magneto-optic selectivity to two different magnetic contributions in magnetic nanostructure. The method is demonstrated on nanostructures containing magnetically hard Fe particles in surface layer of soft FeNbB amorphous ribbon. We separated both magnetic contributions from measurement of hysteresis loops using magneto-optic Kerr effect in longitudinal configuration. Magneto-optic selectivity is discussed and theoretical model on the basis of effective medium is compared with experimental data of longitudinal magneto-optic Kerr effect depending on angle of incidence.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 837-839
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 54.

Tytuł:

Photovoltaic Effect on PbTe p-n Junction in the Presence of Magnetic Field

Autorzy:

Le Van, Khoi
Grodzicka, E.
Witkowska, B.
Story, T.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1929738.pdf

Data publikacji:

1993-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

Photovoltaic spectra of PbTe p-n junction have been measured in the infrared spectral region in the temperature range of 8-260 K. The p-n junctions have been formed by cadmium diffusion into the p-type PbTe crystals. From the positions of the photovoltaic maxima the energy gap of the diode material has been determined. In the presence of a magnetic field up to 7 T, a pronounced oscillatory behavior of the photovoltage was observed in the Faraday and Voigt configurations. Experiments were performed as a function of the magnetic field intensity at a constant wavelength of the incident light. The energy of the interband magnetooptical transitions between the Landau levels in PbTe was determined and compared with the theoretical model of Adler, describing the energy band structure for the IV-VI compounds.

Źródło:

Acta Physica Polonica A; 1993, 84, 4; 721-724
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Ground Shallow Donor State of III-V Compounds for Arbitrary Magnetic Field

Autorzy:

Obuchowicz, A.
Własak, J.

Powiązania:

https://bibliotekanauki.pl/articles/1921601.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
61.50.Em
71.55.-i

Opis:

Theory of shallow donor in III-V semiconductors in the presence of magnetic field is reinvestigated. Considerations are performed within the 3-level Kane model. In order to avoid singularities caused by the Coulomb potential we divide it into short- and long-range components. The latter one is the slowly varying potential and contrary to the Coulomb potential it satisfies all demands for envelope function equation. The short-range part is contributing to a chemical shift. Calculation of energies of two possible spin states of ground donor level are then performed using variational method.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 693-696
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Mechanism of Optical Detection of Magnetic Resonance in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te

Autorzy:

Godlewski, M.
Surma, M.
Gałązka, R. R.
Nguyen, The Khoi
Gisbergen, S.J.C.H.M.
Gregorkiewicz, T.
Ammerlaan, C. A. J.

Powiązania:

https://bibliotekanauki.pl/articles/1921620.pdf

Data publikacji:

1992-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.70.Hb
75.50.Pp
78.20.Ls

Opis:

The photoluminescence and optically detected magnetic resonance studies of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (x = 0.095) are presented. The Mn$\text{}^{2+}$ magnetic resonance is detected optically via the changes of "edge" emission induced by the decrease of the Mn spin system magnetization.

Źródło:

Acta Physica Polonica A; 1992, 82, 4; 717-719
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Magnetooptics of III-V Compounds in Many Band Model Approach

Autorzy:

Obuchowicz, A.
Wlasak, J.

Powiązania:

https://bibliotekanauki.pl/articles/1886749.pdf

Data publikacji:

1991-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
61.50.Em
71.55.-i

Opis:

III-V semiconducting compounds in the presence of a magnetic field are considered. The 14 x 14 effective hamiltonian in the frame of 5-level model is obtained. Directional dependence of selection rules are obtained. Shallow donor levels in the frame of spherical 3-level model are also considered. New trial functions suitable for a whole range of magnetic field are proposed. It is found that the energy as well as the variational function of each magnetodonor level is a continuous function of the magnetic field.

Źródło:

Acta Physica Polonica A; 1991, 79, 2-3; 329-332
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

SQUID Magnetometry and Magneto-Optics of Epitaxial EuSe

Autorzy:

Rumpf, K.
Granitzer, P.
Kellner, W.
Kirchschlager, R.
Janecek, S.
Pascher, H.
Krenn, H.

Powiązania:

https://bibliotekanauki.pl/articles/2038138.pdf

Data publikacji:

2004-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
78.20.Ls
07.55.Jg

Opis:

The complicated (H,T)-magnetic phase diagram of EuSe is caused by the critical balance between nearest and next nearest neighbour exchange interaction (J$\text{}_{NN}$=0.119 K and J$\text{}_{NNN}$=-0.1209 K) and leads to various spin arrangements NNSS..., NSN..., NNS, NNN... [NS denotes opposite ferromagnetic order in adjacent (111) planes]. Beside the subtle local exchange of 5d-t$\text{}_{2g}$ electrons and localized holes with neighbouring Eu-4f spins, obviously also the strain status influences the occurrence of these different phases. We investigate the magnetic ordering phenomenon in a strained 2.5 μm EuSe film on BaF$\text{}_{2}$ substrate by SQUID magnetometry and magneto-optics like spectral Faraday- and Kerr-effect measurements for temperatures from 2 K up to 200 K and for magnetic fields up to 5 T. The magneto-optical probe monitors the local environment of the photoexcited electron-hole pair, called magnetic exciton, located within a ferromagnetic surrounding (photoinduced magnetic polaron), whereas the integral magnetization measured by SQUID is most sensitive to long-range magnetic ordering. In spite of the dissimilarity of measurement techniques we find an influence of the long-range magnetic order (e.g. of the NNS- or NNN-matrix) on the non-resonant Kerr reflection. The complementarity of SQUID and magneto-optical methods is stringent only in the (resonant) spectral regime, where magnetic polarons are formed.

Źródło:

Acta Physica Polonica A; 2004, 105, 6; 621-629
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Beyond the Virtual Crystal Approximation in Diluted Magnetic Semiconductors

Autorzy:

Tworzydło, J.

Powiązania:

https://bibliotekanauki.pl/articles/1873004.pdf

Data publikacji:

1995-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.70.Gm
78.20.Ls
71.55.Gs

Opis:

We present a new model approach which goes beyond the virtual crystal approximation and the molecular field approximation in the description of the spin splitting of band states in diluted magnetic semiconductors. The theory is formulated within a one-band effective mass approximation and explicitly takes into account a chemical and magnetic disorder caused by substitutional ions. The results confirm the apparent dependence of the p-d exchange integral on x in Cd$\text{}_{1-x}$Mn$\text{}_{x}$S for small concentrations of Mn ions and we predict the asymmetric field and temperature dependence of the spin splitting in this compound.

Źródło:

Acta Physica Polonica A; 1995, 87, 2; 391-394
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Self-Induced Persistent Photoconductivity in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions

Autorzy:

Van Khoi, Le
Dobrowolski, W.
Zakrzewski, A.
Dobaczewski, L.
Gałązka, R. R.

Powiązania:

https://bibliotekanauki.pl/articles/1952039.pdf

Data publikacji:

1996-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.25.Tn
78.20.Ls
72.80.Ga

Opis:

At temperatures lower than 200 K the photomemory effect has been observed in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions. The persistent photoconductivity can be achieved either by illumination from an external light source or by a self-absorption of the electroluminescence radiation when a voltage of about 10 V for a few seconds is applied to the diode. Current-voltage characteristics are of the form I~ V$\text{}^{m}$. The capacitance and electroluminescence measurements show that the photomemory effect in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$ Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions can be caused by the bistable nature of the In dopant in the Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate. In the high resistivity interface layer and the substrate material indium forms centers similar to DX-like centers in Zn$\text{}_{x}$Cd$\text{}_{1-x}$Te and Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te.

Źródło:

Acta Physica Polonica A; 1996, 90, 5; 883-886
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Excitons and Trions in Modulation Doped Structures in High Magnetic Fields

Autorzy:

Kochereshko, V.
Andronikov, D.
Platonov, A.
Crooker, S.
Barrick, T.
Karczewski, G.
Tronc, P.

Powiązania:

https://bibliotekanauki.pl/articles/2038321.pdf

Data publikacji:

2004-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.Et
71.35.-y
78.20.Ls
78.40.Fy

Opis:

Photoluminescence spectra of modulation-doped CdTe/CdMgTe quantum well structures containing two-dimensional electron gases of low, moderate and high electron concentrations were studied in high magnetic fields up to 45 T. The recombination line of triplet trion state was found in the spectra. A model calculation of photoluminescence spectra in magnetic fields, which takes into account singlet and triplet trion states, was carried out. It was shown that the dark triplet becomes observable in photoluminescence spectra because it becomes the only recombination channel when the formation of the singlet trion state is suppressed by magnetic fields.

Źródło:

Acta Physica Polonica A; 2004, 106, 3; 319-328
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Exciton Trions in II-VI Heterostructures

Autorzy:

Cox, R. T.
Huard, V.
Kheng, K.
Lovisa, S.
Miller, R. B.
Saminadayar, K.
Arnoult, A.
Cibert, J.
Tatarenko, S.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1968984.pdf

Data publikacji:

1998-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Dx
78.66.Hf
71.35.Ji
78.20.Ls

Opis:

Optical spectra associated with transitions that create or annihilate charged excitons X$\text{}^{-}$ or X$\text{}^{+}$ can be observed in quantum well heterostructures containing an electron gas or a hole gas, respectively. A review is given of properties of trion states in CdTe quantum wells in zero field and of the magnetic field-dependence of the circular polarization and oscillator strength of the trion optical resonance. The possibility that disorder is needed to stabilise trion states in concentrated 2D electron or hole systems is discussed.

Źródło:

Acta Physica Polonica A; 1998, 94, 2; 99-109
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 63.

Tytuł:

The Magneto-Optical Response of Diluted Magnetic Semiconductor $CdTe-Cd_{1-x}Mn_{x}Te$ Multi Quantum Wells in the Voigt Configuration

Autorzy:

Hidari, M.
Farjami Shayesteh, S.

Powiązania:

https://bibliotekanauki.pl/articles/1807790.pdf

Data publikacji:

2009-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.30.Fs
78.30.-j
78.20.Ls
73.21.Fg

Opis:

We have calculated the s- and p-polarized far infrared magnetoplasmon spectra of doped $CdTe-Cd_{1-x}Mn_{x}Te$ multi quantum wells in the presence of a static magnetic field up to 20 T parallel to the surface of the layers using a macroscopic model based on effective medium theory, using a novel approach which gives a good account of the data together with a clear physical interpretation of the various spectral features, such as the free carrier and optical phonon properties. The results show that the transverse optical modes (for the whole composition range, x = 0 to 1) are sensitive and change linearly with respect to the composition parameter. In p-polarized reflectivity the cyclotron resonance experiences a blue shift when the magnetic field strength increases. Also, the analysis of the dielectric tensor function and the Voigt dielectric function is used to determine the carriers' cyclotron effective masses (for both holes and electrons) as a function of composition. Furthermore, a modified random element iso-displacement approach has been extended for the multi layers to analyze the influence of the composition on the optical phonon response in the barrier layer.

Źródło:

Acta Physica Polonica A; 2009, 116, 2; 232-237
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Intra-Shallow-Donor Photoconductivity in Semi-Insulating GaAs

Autorzy:

Karpierz, K.
Sadowski, M. L.

Powiązania:

https://bibliotekanauki.pl/articles/1877562.pdf

Data publikacji:

1991-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.40.+w
78.20.ls
78.50.Ec
78.50.Ge

Opis:

The far-infrared photoconductivity of a semi-insulating GaAs sample was measured at 4.2 K as a function of magnetic field up to 7 T. Apart from a peak corresponding to the 1s - 2p$\text{}_{+1}$ transition of the hydrogen-like shallow donor, a well-pronounced structure was observed which does not appear in n-type GaAs.

Źródło:

Acta Physica Polonica A; 1991, 79, 1; 121-124
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 65.

Tytuł:

Interference Effects in T-MOKE Spectra of Fe Thin Films at the 3p Edges - Theory and Experiment

Autorzy:

Legut, D.
Tesch, M.
Oppeneer, P.
Mertins, H.
Jansing, Ch.
Gilbert, M.
Gaupp, A.
Bürgler, D.
Schneider, C.

Powiązania:

https://bibliotekanauki.pl/articles/1386641.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Gw
78.20.Ls
78.70.Ck
74.20.Pq

Opis:

We present combined first-principle calculations and experimental results of the transversal magneto-optical Kerr effect (T-MOKE) of thin Fe films across the 3p edges using linearly polarized synchrotron radiation. We show that the experimental T-MOKE spectra at the 3p edges of Fe exhibit clear signals that are strongly influenced by interference effects. Ab initio calculated T-MOKE asymmetry spectra confirm the importance of interference effects. The comparison of experimental with calculated spectra reveals some differences that we attribute to metal/metal interface roughness that is not taken into account in the calculations.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 466-468
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 66.

Tytuł:

Skyrmions in a Hole Gas with Large Spin Gap and Strong Disorder

Autorzy:

Bryja, L.
Ryczko, K.
Wójs, A.
Misiewicz, J.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2046907.pdf

Data publikacji:

2006-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Mf
73.21.Fg
78.20.Ls
78.67.De

Opis:

In the photoluminescence excitation spectra of two-dimensional valence holes with large spin gap and strong disorder we find evidence for quantum Hall ferromagnetism and small skyrmions around the Landau level filling factorν=1. This interpretation is supported by numerical calculations.

Źródło:

Acta Physica Polonica A; 2006, 110, 2; 163-168
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 67.

Tytuł:

Element Specific Magnetometry Combining X-ray Circular with Linear Dichroism: Fundamentals and Applications

Autorzy:

Kowalik, I.

Powiązania:

https://bibliotekanauki.pl/articles/1399311.pdf

Data publikacji:

2015-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Dm
78.20.Ls
75.50.Pp
75.50.Tt

Opis:

This article gives an overview of the use of X-ray absorption spectroscopy to characterize the magnetic properties for technologically important, low dimensional magnetic materials. An overview is given both for the experimental hardware, the measurements and the analysis of the spectra. The information obtained is discussed for metallic and semiconducting systems, using both the X-ray magnetic circular dichroism and the X-ray linear magnetic dichroism spectroscopy.

Źródło:

Acta Physica Polonica A; 2015, 127, 3; 831-849
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 68.

Tytuł:

Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses

Autorzy:

Nakajima, M.
Yamaguchi, K.
Suemoto, T.

Powiązania:

https://bibliotekanauki.pl/articles/1489996.pdf

Data publikacji:

2012-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.78.Jp
42.50.Md
76.50.+g
78.20.Ls

Opis:

We demonstrated coherent control of spin precession motion due to the ferromagnetic resonance induced by magnetic field component of ultrashort terahertz pulses. The amplitude of the precession can be controlled by the pulse separation time of the double pulse excitation technique. We succeeded in observing the energy transfer between spin and photon systems, and the energy of the spin system is returned to the second terahertz pulses instantaneously when the precession amplitude is cancelled.

Źródło:

Acta Physica Polonica A; 2012, 121, 2; 343-346
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 69.

Tytuł:

Excitonic Polaritons in Transverse Magnetic Fields

Autorzy:

Loginov, D.
Kochereshko, V. P.
Litvinov, A.
Besombes, L.
Mariette, H.
Davies, J. J.
Smith, L. C.
Wolverson, D.

Powiązania:

https://bibliotekanauki.pl/articles/2047705.pdf

Data publikacji:

2007-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.35.-y
71.35.Ji
78.20.Ls
78.67.De

Opis:

Reflectivity spectra taken from wide quantum wells based on CdTe/CdZnTe and GaAs/AlGaAs (in which the well width is much larger than the exciton Bohr radius) were studied in magnetic fields in the plane of the well (the Voigt geometry). The energy splitting between bright and dark excitons and the redistribution of the oscillator strength from bright to dark was observed and this allowed us to determine the exciton exchange constantΔ. We found that exciton translational mass depends on the value of magnetic field. Additionally, we found that diamagnetic shift also depends on exciton wave vector. Changes in the spectra in the range of the overlap of heavy and light hole exciton resonances were observed when the magnetic field was inverted. Theoretical modeling of the spectra allowed us to explain all the observed features in the reflectivity spectra and to determine some material parameters.

Źródło:

Acta Physica Polonica A; 2007, 112, 2; 381-386
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 70.

Tytuł:

Excitonic Effects in Linear and Photoinduced Faraday Rotation in Semimagnetic Semiconductors

Autorzy:

Leisching, P.
Pankoke, R.
Buss, C.
Frey, R.
Flytzanis, C.
Cibert, J.
Wasiela, A.

Powiązania:

https://bibliotekanauki.pl/articles/1968336.pdf

Data publikacji:

1997-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.65.-k
75.30.Et
78.20.Ls
78.66.Hf

Opis:

We investigate the influence of the Coulomb interaction on the giant linear and photoinduced Faraday rotation in the bulk Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te system. Experimental results are presented and discussed by calculating the complex dielectric function. The anisotropy and k-dependence of the magnetic spin-exchange interaction and the Coulomb interaction between optically excited bound and unbound electron-hole pairs are considered using a microscopic theory. At high excitation densities, the excitonic nonlinearities of the 1s transitions are investigated.

Źródło:

Acta Physica Polonica A; 1997, 92, 5; 895-898
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 71.

Tytuł:

Role of Oxygen Coordination on the Ultrafast Demagnetization in Ferrite Nanoparticles

Autorzy:

Terrier, E.
Liu, Y.
Begin, S.
Pichon, B.
Bigot, J.
Halte, V.

Powiązania:

https://bibliotekanauki.pl/articles/1385573.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.47.J-
78.20.Ls
75.30.Et
75.75.Fk

Opis:

In this work, we have studied the ultrafast dynamics of charges and spins in assemblies of magnetite (Fe₃O₄) and maghemite (γ - Fe₂O₃) nanoparticles. We demonstrate that using time-resolved magneto-optics one is able to disentangle those very similar iron oxide structures. The Fe₃O₄ nanoparticles are elaborated by hydrothermal decomposition and deposited by drop on a glass substrate. γ - Fe₂O₃ nanoparticles assemblies have been obtained by annealing the Fe₃O₄ nanoparticles. Comparing time resolved transmission and Faraday rotation, our measurements show that in case of Fe₃O₄ the demagnetization occurs after the thermalization of the charges, as expected from previous works on ultrafast quenching of magnetization in ferromagnetic nanostructures. On the contrary, in the case of maghemite nanoparticles, an acceleration of the demagnetizing occurs, leading to a simultaneous charges and spins dynamics. We attribute this behavior to the rearrangement of vacancies and annealing of crystal defects in maghemite.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 345-346
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 72.

Tytuł:

Optical Properties of Diluted Magnetic Semiconductor Quantum Structures

Autorzy:

Dobrowolska, M.
Luo, H.
Furdyna, J. K.

Powiązania:

https://bibliotekanauki.pl/articles/1931886.pdf

Data publikacji:

1995-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Et
73.20.Dx
68.55.Bd
78.20.Ls

Opis:

Conduction and valence band edges in diluted magnetic semiconductors undergo enormous Zeeman shifts when a magnetic field is applied, reaching values in excess of 100 meV at low temperatures. These Zeeman shifts can thus have profound consequences on the properties of DMS/non-DMS heterostructures, since they provide the opportunity of tuning their band alignment by varying an applied field. This leads to a variety of entirely new effects, and also provides a powerful tool for probing the effect of band alignment on the properties of semiconductor heterostructures in general. We illustrate this with several examples. First, using the ZnSe/ZnMnSe system, we discuss the creation of a spatial spin modulation (spin superlattice). Second, we use the drastic differences in the Zeeman splitting occurring in different layers of a DMS/non-DMS superlattice in order to pinpoint the localization in space of the specific electronic states involved in optical transitions. We illustrate this by investigating the localization of above-barrier states in type-I ZnSe/ZnMnSe superlattices, and of spatially-direct (type-I) excitons which occur in ZnTe/CdMnSe and ZnMnTe/CdSe type-II super-lattices. Finally, we exploit Zeeman tuning to demonstrate the confinement effects which occur in a single quantum barrier.

Źródło:

Acta Physica Polonica A; 1995, 87, 1; 95-106
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Measurement of Very Small Zeeman Splittings in GaN:Mn,Mg by Faraday Rotation

Autorzy:

Wołoś, A.
Kossacki, P.
Golnik, A.
Kamińska, M.
Gaj, J. A.
Twardowski, A.
Grzegory, I.
Boćkowski, M.
Porowski, S.

Powiązania:

https://bibliotekanauki.pl/articles/2035615.pdf

Data publikacji:

2002

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
71.70.Ej
71.55.Eq
71.20.Nr

Opis:

In this work we demonstrate an application of Faraday rotation for measuring an extremely small Zeeman splitting of an Mn related absorption line placed at 1.417 eV in optical absorption spectrum of Mn and Mg doped gallium nitride. Analysis of the collected spectra allowed us to determine the value of the splitting as equal to 0.12±0.01 meV at 6 T. This data should help in establishing the nature of the observed absorption band.

Źródło:

Acta Physica Polonica A; 2002, 102, 4-5; 695-699
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 74.

Tytuł:

Magnetochiral Effect in H$\text{}_{h}$ and V$\text{}_{h}$ Components of Rayleigh Light Scattering by Diamagnetic Molecular Systems

Autorzy:

Woźniak, S.

Powiązania:

https://bibliotekanauki.pl/articles/2028894.pdf

Data publikacji:

2001-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

33.15.Kr
33.20.Fb
33.55.-b
78.20.Ls

Opis:

A static magnetic field B$\text{}^{0}$, acting on a chiral liquid perpendicular to the propagation direction of an optical beam, is shown to induce a magnetochiral change of Rayleigh light scattering which is different in sign for the light scattered parallel and antiparallel to B$\text{}^{0}$. It is related to the electric dipole and magnetic dipole or/and electric quadrupole moments induced simultaneously in a chiral molecule by electric dipole interaction with electromagnetic radiation. For diamagnetic molecules the effect is described by linear and nonlinear polarizabilities, responsible also for circular birefringence (natural optical activity and the Faraday effect) as well as axial (magnetochiral) birefringence.

Źródło:

Acta Physica Polonica A; 2001, 100, 4; 517-528
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 75.

Tytuł:

Combined Exciton-Cyclotron Resonance in Photoluminescence of a Two-Dimensional Hole Gas

Autorzy:

Jadczak, J.
Bryja, L.
Płochocka, P.
Wójs, A.
Misiewicz, J.
Maude, D.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/1791299.pdf

Data publikacji:

2009-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Mf
71.35.Ji
71.35.Pq
78.20.Ls

Opis:

A two-dimensional hole gas in an asymmetric GaAs/$Ga_{1-x}Al_{x}As$ quantum well is studied by polarization-resolved photoluminescence in high magnetic fields (up to B = 20 T) and at low temperatures (down to T = 50 mK). In addition to the previously reported dominant emission channels of various free and acceptor-bound trions, the high-energy hole cyclotron replicas of the bound states are now also observed, corresponding to the combined exciton-cyclotron resonance. Identification of different transitions in the rich, multi-peak spectra was possible by the analysis of optical selection rules and comparison of the experimental spectra with realistic numerical calculations.

Źródło:

Acta Physica Polonica A; 2009, 116, 5; 852-853
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Emission from Mesoscopic-Size Islands Formed in a GaAs/AlAs Double Layer Structure

Autorzy:

Wysmołek, A.
Chwalisz, B.
Potemski, M.
Stępniewski, R.
Babiński, A.
Raymond, S.
Thierry-Mieg, V.

Powiązania:

https://bibliotekanauki.pl/articles/2038338.pdf

Data publikacji:

2004-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.De
78.20.Ls
71.35.Lk
73.20.-r
78.47.+p

Opis:

The nature of sharp emission lines which are present in macro-luminescence experiments on a type-II GaAs/AlAs double quantum well structure is discussed. The experiments, which also include micro-lumines- cence measurements, allowed us to conclude that the sharp emission lines observed originate from lateral GaAlAs islands of a fewμm in diameter. They serve as efficient type-I recombination centers for indirect excitons and/or carriers which diffuse in the GaAs/AlAs QW structure and strongly affect the emission processes observed in macro-luminescence experiments. These traps can easily be filled with electron-hole pairs, giving rise to the formation of neutral excitons as well as more complex excitonic molecules. Magneto-luminescence spectra from single islands resemble those observed for natural quantum dots formed in narrow GaAs quantum wells.

Źródło:

Acta Physica Polonica A; 2004, 106, 3; 367-381
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Evidence of Singlet-Triplet Crossing in Photoluminescence of Positively Charged Excitons in GaAs Quantum Wells

Autorzy:

Bryja, L.
Wójs, A.
Jadczak, J.
Misiewicz, J.
Płochocka, P.
Potemski, M.
Reuter, D.
Wieck, A.

Powiązania:

https://bibliotekanauki.pl/articles/1811918.pdf

Data publikacji:

2008-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Mf
71.35.Ji
71.35.Pq
78.20.Ls

Opis:

Positively charged excitons in a two-dimensional hole gas in symmetric and asymmetric GaAs/$Ga_{1-x}Al_{x}As$ quantum wells are studied in polarization-resolved photoluminescence experiments in high magnetic fields B (up to 23 T) and low temperatures (down to 300 mK). The experiments are accompanied by numerical calculations of a real structure. The whole family of trions (the singlet and a pair of triplets) are observed. The Coulomb energies crossing of singlet and triplet is found: hidden in symmetric and visible in asymmetric structures.

Źródło:

Acta Physica Polonica A; 2008, 114, 5; 1073-1077
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Exciton Exchange between Nearly-Free and Acceptor-Bound States of a Positive Trion Assisted by Cyclotron Excitation

Autorzy:

Jadczak, J.
Bryja, L.
Wójs, A.
Bartsch, G.
Yakovlev, D. R.
Bayer, M.
Plochocka, P.
Potemski, M.
Reuter, D.
Wieck, A.

Powiązania:

https://bibliotekanauki.pl/articles/2047925.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.20.Mf
71.35.Ji
71.35.Pq
78.20.Ls

Opis:

In magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well we observe coupling of two different radiative states. The pair of coupled states are an acceptor-bound trion AX$\text{}^{+}$ and an essentially free (only weakly localized by a shallow lateral potential) trion X$\text{}^{+}$, brought into resonance by an additional cyclotron excitation controlled by the magnetic field. The coupling mechanism is the exciton transfer, and the optical signature is a clear anticrossing of the emission lines of an X$\text{}^{+}$ and a cyclotron replica of the AX$\text{}^{+}$.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 600-601
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 79.

Tytuł:

Magnetooptics in Layered Nonlinear Structures

Autorzy:

Boardman, A. D.
Xie, M.

Powiązania:

https://bibliotekanauki.pl/articles/2035662.pdf

Data publikacji:

2003

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.65.Tg
42.65.Wi
42.25.Fx
78.20.Ls

Opis:

The magnetooptics of an asymmetric layered waveguide structure is discussed to investigate the possibility of creating new devices that combine both nonreciprocity and nonlinearity. After addressing some fundamental magnetooptic properties and the kind of materials needed, a straightforward envelope theory is given that exploits the Voigt effect instead of the more obvious Faraday effect. It is emphasised that this choice leads to desirable design features. It is proposed that the introduction of an applied magnetic field to a waveguide structure can be achieved through the use of thin current-carrying strips. It is emphasised that the strips can be arranged to any degree of complexity and that a high degree of control over spatial soliton dynamics can be achieved. Spatial soliton light beams are selected because they can be generated, within a waveguide, in a stable form. The attractive features of using the type of magnetooptic waveguide investigated here are highlighted with examples and it is concluded that the formats proposed can be used for the fully integrated isolator capacity that modern laser systems demand.

Źródło:

Acta Physica Polonica A; 2003, 103, 2-3; 121-131
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 80.

Tytuł:

Semimagnetic Semiconductors

Autorzy:

Gaj, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/2011142.pdf

Data publikacji:

1999-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
78.20.Ls
71.70.Gm
75.30.Et

Opis:

This paper contains a description and explanation of selected basic phenomena characteristic of bulk semimagnetic semiconductors: giant Faraday rotation and giant Zeeman splitting, mean field approximation and its limitations, ion-ion interaction, its measurements and its influence on magnetic properties, etc. The basic part is followed by a discussion of a personal choice of new perspectives open by the introduction of diluted magnetic semiconductors in semiconductor quantum structures. In particular, the role of magnetic ions in characterization of semiconductor quantum structures and low-dimensional excitonic systems is analyzed. Particular attention is paid to magnetooptical phenomena and magnetooptical experimental methods in large gap II-VI semimagnetic semiconductors.

Źródło:

Acta Physica Polonica A; 1999, 96, 5; 651-664
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Diluted Magnetic III-V Semiconductors

Autorzy:

Twardowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2014143.pdf

Data publikacji:

2000-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
71.55.Eq
78.20.Ls
71.70.Gm

Opis:

During recent years diluted magnetic semiconductors based on III-V compounds have been of considerable interest. In this respect we review the basic properties of these materials, which are nearly exclusively Mn-based systems, such as GaMnAs, InMnAs, GaMnSb, and GaN:Mn. We discuss the nature of Mn impurity. Different Mn centers are considered and experimental pieces of evidence suggesting the dominating role of Mn (d$\text{}^{5}$) configuration are given. Then we analyze s, p-d exchange, together with resulting magnetooptical properties (in particular absorption edge slitting for heavily p-type GaMnAs). The coupling between Mn ions (d-d exchange) and ferromagnetic ordering observed in InMnAs and GaMnAs is the next subject. Some mechanisms responsible for this ordering are presented. Finally we discuss transport properties and some selected problems of quantum structures based on III-V diluted magnetic semiconductors.

Źródło:

Acta Physica Polonica A; 2000, 98, 3; 203-216
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 82.

Tytuł:

Optical Sensor of the Magnetic Field in Electrical Power Engineering

Autorzy:

Barczak, K.
Pustelny, T.
Zycki, Z.
Blazejczyk, T.
Dorosz, D.

Powiązania:

https://bibliotekanauki.pl/articles/1506720.pdf

Data publikacji:

2010-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.70.-a
42.81.-i
42.79.Pw
78.20.Ls

Opis:

The authors of the presented paper deal with investigations concerning applications of the optical fiber sensor of the magnetic field in electric DC engines with permanent magnets. The aim of the sensor is to measure the state of magnetization of permanent magnets (basing on the measurements of magnetic field induction). The knowledge of the state of magnetization helps to decide whether permanent magnets need to be additionally magnetized in order to prevent damages of the whole engine. This can be done automatically, even when the engine is running. For the purpose the Faraday magnetooptic effect is used. The presented investigations concern an optical fiber sensor of the magnetic field provided with a glass rod characterized a high value of the Verdet constant as the sensing element. Thanks to the application of optical fibers the connection of the sensor head with the whole measuring system is constructed of insulating material without using of electrical connections.

Źródło:

Acta Physica Polonica A; 2010, 118, 6; 1090-1092
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 83.

Tytuł:

Second-Harmonic Generation Studies of Inhomogeneous Magnetization Distributions in Thin Garnet Film

Autorzy:

Bonda, A.
Uba, S.
Uba, L.

Powiązania:

https://bibliotekanauki.pl/articles/1386869.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
42.65.Ky
75.50.Gg
75.70.-i

Opis:

The magnetization processes can be effectively studied using magnetization-induced second-harmonic generation effect (MSHG). The aim of the current work is the investigation of inhomogeneous magnetization distributions induced in the surface area of the garnet film by ion implantation. The studies were performed on magnetic garnet film of (111) symmetry, implanted with H⁺₂ ions of 1.5 × 10¹⁶ cm¯² dose and 60 keV energy. The measurements of MSHG effect were performed as a function of the sample rotation angle and the amplitude of external magnetic field. The observed MSHG intensity hystereses were subjected to a decomposition procedure into contributions having different magnetic field dependences. The contributions originating from the implanted and unimplanted parts of the film volume of different magnetic ordering were analyzed and discussed.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 511-513
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Terahertz Detection by the Entire Channel of High Electron Mobility Transistors

Autorzy:

Sakowicz, M.
Łusakowski, J.
Karpierz, K.
Knap, W.
Grynberg, M.
Köhler, K.
Valusis, G.
Gołaszewska, K.
Kamińska, E.
Piotrowska, A.
Caban, P.
Strupiński, W.

Powiązania:

https://bibliotekanauki.pl/articles/1811985.pdf

Data publikacji:

2008-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.+a
78.20.Ls
85.30.Tv
07.57.Kp

Opis:

GaAs/AlGaAs and GaN/AlGaN high electron mobility transistors were used as detectors of THz electromagnetic radiation at liquid helium temperatures. Application of high magnetic fields led to the Shubnikov-de Haas oscillations of the detection signal. Measurements carried out with a simultaneous modulation of the intensity of the incident THz beam and the transistor gate voltage showed that the detection signal is determined by the electron plasma both in the gated and ungated parts of the transistor channel. This result is of importance for understanding the physical mechanism of the detection in high electron mobility transistors and for development of a proper theoretical description of this process.

Źródło:

Acta Physica Polonica A; 2008, 114, 5; 1343-1348
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

Magneto-Optical Study of NiFe/Au/Co/Au Layers

Autorzy:

Mazalski, P.
Postava, K.
Tekielak, M.
Maziewski, A.
Urbaniak, M.
Szymański, B.
Stobiecki, F.

Powiązania:

https://bibliotekanauki.pl/articles/1810594.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.60.-d
75.70.-i
75.70.Ak
78.20.Ls

Opis:

Sputtered NiFe/Au/Co/Au layers with noncollinear magnetizations are of scientific interest for unusual magnetization behavior and their potential application in spintronics. In this paper, we propose to use a material selective sensitivity of magneto-optical Kerr effect for separation of signals from different materials in a bilayer system. The materials selective sensitivity is demonstrated on a sample with two mutually perpendicular Co and NiFe wedges.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 369-371
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

X-Ray Magnetic Circular Dichroism Studies on $CeNi_4B$

Autorzy:

Toliński, T.
Cezar, J.
Wende, H.
Kowalczyk, A.
Baberschke, K.

Powiązania:

https://bibliotekanauki.pl/articles/1810402.pdf

Data publikacji:

2009-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.Lp
75.20.Hr
78.70.Dm
79.60.-i
78.20.Ls

Opis:

The $CeNi_4B$ compound is a mixed-valence system. It is a paramagnet with $μ_\text{eff}$= 0.52 $μ_{B}$/f.u. and the paramagnetic Curie temperature θ= -10.7 K. In the present research we complete our previous magnetic susceptibility and X-ray photoemission measurements with new studies by the X-ray magnetic circular dichroism method. The observation of the Ce $M_{4,5}$ edges carried out with X-ray magnetic circular dichroism confirms the mixed-valence state deduced previously from X-ray photoemission spectroscopy. Moreover, we report on the measurements of the Ni $L_{2,3}$ edges, which enable verification of the Ni contribution to the magnetism of this compound.

Źródło:

Acta Physica Polonica A; 2009, 115, 1; 129-131
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers

Autorzy:

Papaj, M.
Kobak, J.
Rousset, J.
Janik, E.
Golnik, A.
Kossacki, P.
Pacuski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1403629.pdf

Data publikacji:

2012-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji

Opis:

We report on epitaxial growth of diluted magnetic semiconductor (Zn,Co)Te. Reflectivity spectra reveal excitonic transition which split under magnetic field due to giant Zeeman effect. Magnetooptical effects can be described using literature data.

Źródło:

Acta Physica Polonica A; 2012, 122, 6; 1010-1011
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium

Autorzy:

Brzózka, K.
Sovák, P.
Szumiata, T.
Górka, B.
Gawroński, M.

Powiązania:

https://bibliotekanauki.pl/articles/1428972.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.70.-i
76.80.+y
78.20.Ls

Opis:

Thin films of Nanoperm alloys with partial substitution of iron by yttrium are the subject of investigations. The attention is fixed on the influence of yttrium substitution on structure and magnetic characteristics of the samples. The effect of film thickness is also considered. Conversion electron Mössbauer spectroscopy and magneto-optic Kerr effect were used to derive hyperfine parameters and coercive field, respectively. Coexistence of crystalline bcc-Fe phase and an amorphous one with diverse proportion was stated in most of the samples. It was found that surface and interface regions contribute to the magnetic properties of films.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1270-1272
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Magnetooptical Properties of (Ga,Fe)N Layers

Autorzy:

Papierska, J.
Rousset, J.
Pacuski, W.
Kossacki, P.
Golnik, A.
Nawrocki, M.
Gaj, J.
Suffczyński, J.
Kowalik, I.
Stefanowicz, W.
Sawicki, M.
Dietl, T.
Navarro-Quezada, A.
Faina, B.
Li, T.
Bonanni, A.

Powiązania:

https://bibliotekanauki.pl/articles/1492954.pdf

Data publikacji:

2011-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji

Opis:

Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.

Źródło:

Acta Physica Polonica A; 2011, 120, 5; 921-923
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Optical Fibre Current Sensor for Electric Power Industry

Autorzy:

Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.

Powiązania:

https://bibliotekanauki.pl/articles/1506714.pdf

Data publikacji:

2010-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.70.-a
42.81.-i
42.79.Pw
78.20.Ls

Opis:

The paper deals with the optical fibre current sensor based on new optical fibre made of glass with a high value of refractive index. This kind of glass was developed to meet the requirements of these optical fibres. The aim of investigations was to develop a new optical fibre with adequate magneto-optical properties and a relatively weak linear birefringence resulting from the process of its production. These features are of essential importance for optical fibre current sensors. The results of investigations concerning such optical fibres have been presented, displaying satisfactory magneto-optical properties, as well as only low linear birefringence induced by stresses arising in the course of their manufacturing.

Źródło:

Acta Physica Polonica A; 2010, 118, 6; 1087-1089
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Finemet Thin Films Substituted by Chromium - CEMS and MOKE Study

Autorzy:

Brzózka, K.
Szumiata, T.
Sovák, P.
Górka, B.
Hibner, K.
Balcerski, J.

Powiązania:

https://bibliotekanauki.pl/articles/1533968.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
61.46.Hk
76.80.+y
78.20.Ls

Opis:

Conversion electron Mössbauer spectroscopy and magneto-optical Kerr effect were applied to investigate hyperfine interactions and macroscopic magnetic properties of Finemet-type thin films. Phase analysis as well as compositional evolution of hyperfine parameters and coercivity was performed in the range of chromium percentage 0 ≤ x ≤ 14. Essential differences in structure and hyperfine parameters were found for films of different chromium concentration. Coercivity shows non-monotonic dependence with minimal value at x = 5.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 794-796
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

New Optical Glasses with High Refractive Indices for Applications in Optical Current Sensors

Autorzy:

Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.

Powiązania:

https://bibliotekanauki.pl/articles/1795777.pdf

Data publikacji:

2009-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.70.-a
42.81.-i
42.79.Pw
78.20.Ls

Opis:

The paper concentrates on the optical fibre sensors of electric current intensity. The specially elaborated glasses with high values of refractive indices were investigated in the prepared testing stand. The glasses have possessed the refractive index values n in the range 1.6 ≤ n ≤ 2.2. For the glasses the values of the Verdet constants for two waveguides: $λ_1$ = 635 nm and $λ_2$ = 1550 nm were determined. The obtained results showed that the elaborated on the base of new glasses optical fibres are much more sensitive on the action of magnetic field than the silica fibres.

Źródło:

Acta Physica Polonica A; 2009, 116, 3; 247-249
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Photonic-Crystal Fibres with Suspended Core - Numerical Analyses

Autorzy:

Pustelny, T.
Grabka, M.

Powiązania:

https://bibliotekanauki.pl/articles/1811518.pdf

Data publikacji:

2008-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
07.07.Df
42.79.Pw
42.81.-i

Opis:

The paper gives a short description of light guidance mechanisms of index-guided photonic-crystal fibres. The results of numerical analyses of photonic-crystal fibres with a suspended core are presented. Such fibres are planned to be applied for investigation of magneto-optic effects in gaseous media.

Źródło:

Acta Physica Polonica A; 2008, 114, 6A; A-115-A-120
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

The New Sensing Fibre for Application in Optical Fibre Current Sensor

Autorzy:

Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.

Powiązania:

https://bibliotekanauki.pl/articles/1811528.pdf

Data publikacji:

2008-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.20.Ls
42.81.Gs
42.81.Pa
42.81.Qb

Opis:

The present paper deals with investigations concerning optical fibre current sensors. They are mainly applied in measurements of the intensity of the electric current in the power lines as so-called optical transformers of the electrical current. The most important advantages of fibre current sensors are: safety of service, insulating power as well as their insensitiveness to electromagnetic interference. The investigations were concentrated on designing of adequate sensing fibre, and particularly on the choice of an adequate kind of glass, of which this fibre could be made. Besides, also the head of the fibre current sensor was designed, basing on the suggested and produced sensing fibre. The paper presents the results of magneto-optic tests of the glass and the sensing fibre.

Źródło:

Acta Physica Polonica A; 2008, 114, 6A; A-3-A-6
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Simulation of Unsaturation Domain Formation in Antiferromagnetic Multilayers

Autorzy:

Major, M.
Bottyán, L.
Nagy, D. L.

Powiązania:

https://bibliotekanauki.pl/articles/2030438.pdf

Data publikacji:

2002-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.Kw
75.40.Mg
78.20.Ls
75.25.+z

Opis:

A two-dimensional phenomenological model of patch-domain formation on unsaturation in strongly coupled tri- and multilayer antiferromagnets is presented. Domain patterns are simulated using a fast Monte Carlo algorithm. As a first example the autocorrelation function of the simulated domain pattern is compared with that of a measured Kerr image.

Źródło:

Acta Physica Polonica A; 2002, 101, 2; 301-305
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Motional Enhancement of Exciton Magnetic Moments

Autorzy:

Litvinov, A.
Kochereshko, V.
Cox, R. T.
Besombes, L.
Mariette, H.
Boukari, H.
Loginov, D.
Davies, J. J.
Smith, L. C.
Wolverson, D.

Powiązania:

https://bibliotekanauki.pl/articles/2047370.pdf

Data publikacji:

2007-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.35.Cc
71.35.Ji
71.36.+c
78.20.Ls

Opis:

The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.

Źródło:

Acta Physica Polonica A; 2007, 112, 2; 161-165
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Excitonic Giant Zeeman Effect in Wide Gap Diluted Magnetic Semiconductors Based on ZnO and GaN

Autorzy:

Pacuski, W.
Ferrand, D.
Kossacki, P.
Marcet, S.
Cibert, J.
Gaj, J. A.
Golnik, A.

Powiązania:

https://bibliotekanauki.pl/articles/2046983.pdf

Data publikacji:

2006-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Pp
75.30.Hx
78.20.Ls
71.35.Ji

Opis:

We present a theoretical description of the excitonic giant Zeeman effect observed in wide gap diluted magnetic semiconductors (Zn,Co)O and (Ga,Mn)N. In these materials, A and B excitons present quite complex energy shifts and change of oscillator strengths under magnetic field. These features can be well reproduced using an excitonic Hamiltonian, taking into account ion-carrier exchange, wurtzite trigonal crystal field, spin-orbit and electron-hole exchange interactions.

Źródło:

Acta Physica Polonica A; 2006, 110, 3; 303-309
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Quantum Size Effects in Ultrathin Layered Magnetic Systems

Autorzy:

Bruno, P.

Powiązania:

https://bibliotekanauki.pl/articles/1953153.pdf

Data publikacji:

1997-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.Cn
75.30.Et
78.20.Ls
75.70.-i

Opis:

The effect of electron confinement in ultrathin layered magnetic systems is discussed. This leads to quantum size effects which can be observed by photoemission in overlayers. In magnetic multilayers, spectacular oscillatory behavior of the interlayer exchange coupling results from the electron confinement. The quantum size effects manifest themselves also in the magneto-optical properties of ultrathin films.

Źródło:

Acta Physica Polonica A; 1997, 91, 1; 37-54
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Exchange Coupled Double Layers for Magneto-Optical Applications

Autorzy:

Becker, S.
Rohrmann, H.
Roell, K.
Stobiecki, F.

Powiązania:

https://bibliotekanauki.pl/articles/1953155.pdf

Data publikacji:

1997-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.Ch
42.79.Vb
78.20.Ls
75.70.-i

Opis:

Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.

Źródło:

Acta Physica Polonica A; 1997, 91, 1; 55-65
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Optical Anisotropy of Quantum Disks in the External Static Magnetic Field

Autorzy:

Schillak, P.
Czajkowski, G.

Powiązania:

https://bibliotekanauki.pl/articles/1811986.pdf

Data publikacji:

2008-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.35.Cc
71.35.Ji
73.21.La
78.20.Ls
78.67.Hc

Opis:

We show how to compute the optical functions (the complex magneto-susceptibility, dielectric function, magneto-reflection and ellipsometric spectra) for semiconductor quantum disks exposed to a uniform magnetic field in the growth direction, including the excitonic effects. The optical response is calculated for an oblique incidence of the propagating electromagnetic wave and for input waves with different polarization. The method uses the microscopic calculation of nanostructure excitonic wave functions and energy levels, and the macroscopic real density matrix approach to compute the electromagnetic fields and susceptibilities. The electron-hole screened Coulomb potential is adapted and the valence band structure is taken into account in the cylindrical approximation, thus separating light- and heavy-hole motions. The novelty of our approach is that the solution is obtained in terms of known one-particle electron and hole eigenfunctions, since, in the considered nanostructure due to confinement effects accompanied by the e-h Coulomb interaction, the separation of the relative- and center-of-mass motion is not possible. We obtain both the eigenvalues and the eigenfunctions. The convergence of the proposed method is examined. We calculate the magnetooptical functions, including the optical Stokes parameters and ellipsometric functions for the case of oblique incidence. Numerical calculations were performed for InAs (disk)/ GaAs (barrier) disks. A good agreement with experiments was obtained.

Źródło:

Acta Physica Polonica A; 2008, 114, 5; 1349-1354
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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