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    Wyświetlanie 1-11 z 11
    Tytuł:
    Effect of Nanocrystallization Process on the Magnetomechanical Coupling in Fe-Si-B-Cu-Nb Alloy
    Autorzy:
    Kaczkowski, Z.
    Małkiński, L.
    Kuźmiński, M.
    Müller, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861130.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.60.Nt
    75.60.Ch
    Opis:
    Magnetic and magnetoelastic properties of the Fe$\text{}_{73.5}$Si$\text{}_{16.5}$B$\text{}_{6}$Cu$\text{}_{1}$Nb$\text{}_{3}$ alloy change considerably during nanocrystallization process. Improvement of magnetic properties is accompanied by the decrease in piezomagnetic parameters such as magnetomechanical coupling and $\Delta E$-effect.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 201-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cavity-Polariton Effects in II-VI Microcavities
    Autorzy:
    André, R.
    Boeuf, F.
    Heger, D.
    Dang, Le Si
    Romestain, R.
    Bleuse, J.
    Müller, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011103.pdf
    Data publikacji:
    1999-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.36.+c
    42.55.Sa
    78.66.-w
    Opis:
    Semiconductor microcavities are monolithic multilayer heterostructures grown by molecular beam epitaxy. They allow the confinement along the growth axis of both photons between the Bragg reflectors and excitons in quantum wells. If the exciton-photon coupling matrix element is large enough compared to the line width, the system is said to be in the strong coupling regime. In that case a quantum well exciton couples to another discrete state: the photon mode of a planar microcavity with the same in-plane wave vector, to give rise to quasi-stationary states named cavity polaritons. In this regime, the Fermi golden rule does not hold any more and the optical properties, linear or nonlinear, are strongly related to polariton features. A review of the optical properties of CdTe-based microcavities operating in the strong coupling regime is given in this paper. The strength of the exciton-photon coupling, dynamic optical properties, and relaxation processes along polariton dispersion curves will be discussed, as well as stimulated emission of cavity polariton luminescence.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 5; 511-524
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Stray Field Detection as Guidance for Electronic Transport Measurements in the B-T Phase Diagram of MnSi
    Autorzy:
    Pohlit, M.
    Witt, S.
    Akbari, M.
    Krellner, C.
    Müller, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030531.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.55.Ge
    72.15.Eb
    72.80.Ga
    75.30.-m
    Opis:
    In order to advance modern information technologies, progress in both the fabrication of magnetic nanostructures and of complex materials, from which small magnetic entities - like the skyrmions present in MnSi - emerge and in developing measurement techniques are desired. Here the sensor-based stray field detection using tailor-made micro-Hall magnetometers has proven to be a versatile tool for studying the magnetization reversal of individual magnetic nanostructures, domain wall motion in thin films, as well as the local stray field close to macroscopic samples. In this article we demonstrate that the local stray field can be used to accurately map out the B-T phase diagram of MnSi and serve as a guidance for simultaneously-performed electronic transport measurements. The presented study also serves as a proof-of-principle experiment for future combined investigations of electronic transport and magnetization focusing on electrically-contacted magnetic nanostructures.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 582-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probing 3d-4f Exchange Interactions by High-Field Magnetization Measurements
    Autorzy:
    Skourski, Y.
    Kuz'min, M.
    Skokov, K.
    Müller, K.
    Wosnitza, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810420.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Et
    75.30.Kz
    Opis:
    In a 4f-3d ferrimagnet the molecular field (a net value expressing the relevant exchange interactions) can be determined from high-field magnetization measurements. If the applied field is high enough, it breaks the ferrimagnetic ground state and drives the system towards ferromagnetic order via non-collinear intermediate phases. Magnetization curves of $Er_2Fe_{17}$ singe crystal were measured along the [100] crystallographic direction in magnetic fields up to 50 T. An unfixed sample, free to rotate, was measured as well. The magnetization measured along the easy magnetization direction shows jumps at 37.5 and 44 T. The first jump was used for the determination of the molecular field (66.4 T). This agrees with the data for the unfixed sample where a kink in the magnetization at 33.5 T yields a molecular field of 65.7 T. The obtained values are in a good agreement with literature data.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 178-180
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Transport and Point Contact Spectroscopy of Cubic DyCu$\text{}_{5}$
    Autorzy:
    Nenkov, K.
    Idzikowski, B.
    Ilkovic, S.
    Kačmarčiková, E.
    Reiffers, M.
    Müller, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013688.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    72.15.Eb
    73.23.Ad
    73.40.Jn
    Opis:
    The electron transport properties and point contact spectra of melt-spun DyCu$\text{}_{5}$ with the cubic phase (structure type AuBe$\text{}_{5}$, space group $F\overline{4}3m$) were investigated. It was found by ac-susceptibility measurements that below a transition temperature T$\text{}_{m}$=6.5 K this phase shows metamagnetism. Between T$\text{}_{m}$ and T$\text{}_{C}$=14.5 K a spontaneous magnetization is found. Our measurements of electrical resistivity confirm the existence of two magnetic phase transitions in the compound. Furthermore, we present point contact spectra of DyCu$\text{}_{5}$-Cu heterocontacts which are directly proportional to the electron-quasiparticle interaction function. Apart from a peak at about 18 meV, which is characteristic of electron-phonon interaction in pure Cu, we observed a series of additional maxima at lower energy, which are connected with the allowed 4f-transitions from the ground state to excited crystalline electric field levels.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 843-846
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upgrade of the Electroporation Device KEA-MOBIL
    Autorzy:
    Sack, M.
    Attmann, F.
    Stängle, R.
    Wolf, A.
    Frey, W.
    Müller, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807923.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.cj
    Opis:
    For the production of synthetic bio-fuel the use of green biomass enables additional resources of raw material supplementary to the commonly used dry material. An electroporation assisted drying process gives the opportunity of a more efficient dewatering than only pressing and subsequent drying. Experiments showed a lower relative humidity of the pressed material after electroporation compared to pressing the raw material only. Moreover, the drying process of the electroporated material was much shorter. This is because the pores formed in the cell membranes foster a better extraction of water during pressing and enhance the diffusion process during the drying process. The paper presents exemplarily the experimental results for green rye. For the electroporation-assisted drying process the electric contact to the plant material has to be established by means of the juice inside the plants only rather than adding additional water. Hence, for experiments in larger scale, the existing electroporation device KEA-MOBIL has been equipped with a new combined electroporation reactor and press. The reactor has a plate electrode system, whose upper electrode additionally serves as a piston to apply mechanical force to extract juice for a good electrical contact between plant material and the electrodes. A two-stage Marx generator serves as a pulse source. To reduce the insulation distance to the walls of the shielding cabin the Marx generator is operated in ground symmetric configuration. The device has been designed for a batch-wise throughput of 50 kg/h. An automatic feeding device enables the alternating use of two test vessels. The device has been tested on-site on a farm with green rye and grass.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1081-1083
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Textures in Thin Ion-Irradiated Ni and Fe Films
    Autorzy:
    Lieb, K. P.
    Zhang, Kun
    Müller, G. A.
    Schaaf, P.
    Uhrmacher, M.
    Felsch, W.
    Münzenberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028981.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Bb
    75.70.Ak
    Opis:
    Heavy-ion bombardment of thin ferromagnetic, polycrystalline films can induce substantial changes of their magnetic and microstructural properties. Since we first identified this effect in 50-150 nm thick Fe and Ni films irradiated with Xe-ions, we made a systematic search for the influence of various film and implantation parameters on the orientation and degree of the magnetic anisotropy and how these parameters correlate with the microstructure of the films. Several analyzing methods, such as Rutherford backscattering, magneto-optical Kerr effect, X-ray diffraction, magnetic force microscopy, $\text{}^{111}$In perturbed angular correlation, and conversion electron Mössbauer spectroscopy, were employed in the investigation.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 751-760
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications
    Autorzy:
    Baeumler, M.
    Polyakov, V.
    Gütle, F.
    Dammann, M.
    Benkhelifa, F.
    Waltereit, P.
    Reiner, R.
    Müller, S.
    Wespel, M.
    Quay, R.
    Mikulla, M.
    Wagner, J.
    Ambacher, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197910.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Fi
    85.30.De
    85.30.Tv
    85.40.Bh
    85.40.Qx
    73.40.-c
    73.90.+f
    73.61.Ey
    73.50.Mx
    Opis:
    The lifetime and stability of AlGaN/GaN heterostructure field effect transistors at high power levels can be enhanced by introducing field plates to reduce electric field peaks in the gate-drain region. Simulations of the electric field distribution along the channel using the 2D ATLAS software from Silvaco indicate that above a characteristic drain source voltage three spatially separated electric field peaks appear, one located at the drain-side edge of the gate foot, one at the end of the drain-sided gate field plate, and one at the end of the source shield field plate. The close correlation between lateral electric field and the electroluminescence due to hot electron related intra-band transitions can be very helpful when optimizing the electric field distribution in high power devices. Electroluminescence microscopy images of devices with gate and source shield field plate reveal the peaks located at the locations of enhanced electric field. By studying the voltage dependence of the electroluminescence peaks the influence of the field plates on the electric field distribution in source drain direction can be visualized.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 982-985
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge Carrier Dynamics in $Ga_{1-x}Mn_{x}As$ Studied by Resistance Noise Spectroscopy
    Autorzy:
    Lonsky, M.
    Teschabai-Oglu, J.
    Pierz, K.
    Sievers, S.
    Schumacher, H.
    Yuan, Y.
    Böttger, R.
    Zhou, S.
    Müller, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1397018.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    73.50.Td
    73.50.-h
    73.61.-r
    64.60.ah
    61.72.-y
    Opis:
    We report on electronic transport measurements of the magnetic semiconductor Ga_{1-x}Mn_{x}As, whereby the defect landscape in various metallic thin films (x=6%) was tuned by He-ion irradiation. Changes in the distribution of activation energies, which strongly determine the low-frequency 1/f-type resistance noise characteristics, were observed after irradiation and can be explained by deep-level traps residing in the As sublattice. Various other kinds of crystalline defects such as, for instance, Mn interstitials, which possibly form nanoscale magnetic clusters with a fluctuating spin orientation, also contribute to the 1/f noise and can give rise to random telegraph signals, which were observed in films with x=7%. In addition, we neither find evidence for a magnetic polaron percolation nor any features in the noise near the Curie temperature.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 520-522
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards Attosecond Pulses with High Harmonics
    Autorzy:
    Agostini, P.
    Paul, P. M.
    Breger, P.
    Toma, E. S.
    Muller, H. G.
    Mullot, G.
    Augé, F.
    Balcou, Ph.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030463.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Re
    42.65.Ky
    32.80.Rm
    33.60.Cv
    Opis:
    The high harmonics produced by focusing an intense femtosecond laser in a gas are theoretically shown to be locked in phase. The physics of this locking is discussed and a new method based on quantum interference in two-photon, two-color ionization allowing to retrieve the relative phase of harmonic pairs is described. The main result is that the 5 harmonics of orders 11-19 produced in argon generate a train of subfemtosecond pulses with a period of 1.35 fs and a duration of 250 attoseconds.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 313-324
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium for antihydrogen production in the AEGIS experiment
    Autorzy:
    Consolati, G.
    Aghion, S.
    Amsler, C.
    Bonomi, G.
    Brusa, R.
    Caccia, M.
    Caravita, R.
    Castelli, F.
    Cerchiari, G.
    Comparat, D.
    Demetrio, A.
    Di Noto, L.
    Doser, M.
    Evans, C.
    Fanì, M.
    Ferragut, R.
    Fesel, J.
    Fontana, A.
    Gerber, S.
    Giammarchi, M.
    Gligorova, A.
    Guatieri, F.
    Haider, S.
    Hinterberger, A.
    Holmestad, H.
    Kellerbauer, A.
    Khalidova, O.
    Krasnicky, D.
    Lagomarsino, V.
    Lansonneur, P.
    Lebrun, P.
    Malbrunot, C.
    Mariazzi, S.
    Marton, J.
    Matveev, V.
    Mazzotta, Z.
    Müller, S.
    Nebbia, G.
    Nedelec, P.
    Oberthaler, M.
    Pacifico, N.
    Pagano, D.
    Penasa, L.
    Petracek, V.
    Prelz, F.
    Prevedelli, M.
    Ravelli, L.
    Rienaecker, B.
    Robert, J.
    Røhne, O.
    Rotondi, A.
    Sandaker, H.
    Santoro, R.
    Smestad, L.
    Sorrentino, F.
    Testera, G.
    Tietje, I.
    Widmann, E.
    Yzombard, P.
    Zimmer, C.
    Zmeskal, J.
    Zurlo, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057954.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    04.80.Cc
    07.77.-n
    36.10.Dr
    78.70.Bj
    Opis:
    The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H̅, a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H̅ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n⁴, n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n=3 state; a second laser pulse (tunable in the range 1650-1700 nm) will further excite Ps to the Rydberg state.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1443-1449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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