Skocz do pozycji: 1.

Tytuł:

Nonlinear Zeeman Splitting of Holes in Doped GaAs Heterostructures

Autorzy:

Kubisa, M.
Ryczko, K.
Jadczak, J.
Bryja, L.
Misiewicz, J.
Potemski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2047934.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c

Opis:

Polarization-resolved photoluminescence from two-dimensional GaAs/GaAlAs heterostructures doped with acceptors was studied in high magnetic fields. Measurements were carried out in low temperatures up to 2 K and magnetic field up to 21 T. Experiments performed in the Faraday configuration enabled to resolve hole states with different spin orientation. We observed a nonlinear behavior of valence-band g factor in strong magnetic fields. To explain obtained results, a detailed theoretical calculation was carried out based on the Luttinger model for valence-band states. We examined the spin splitting of hole levels under the influence of both external magnetic field and built-in electric field existing in doped heterostructures. Changes of hole g factor with the width of the structure and the density of two-dimensional carriers are discussed.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 609-611
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 2.

Tytuł:

Transport and Thermoelectric Properties of Magnetic Organic Structures

Autorzy:

Zberecki, K.
Świrkowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/1030828.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.63.-b
75.75.-c

Opis:

Using ab initio methods, we study transport and thermoelectric phenomena of magnetic organic chains functionalized with nitroxide groups. We predict very good thermoelectric performance of the structure, as the conventional and spin Seebeck coefficients are remarkably enhanced. Our results suggest that magnetic organic chains would have a great potential for applications in spintronic devices.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 532-534
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 3.

Tytuł:

Thermoelectric Properties of Doped Zigzag Silicene Nanoribbons

Autorzy:

Zberecki, K.
Swirkowicz, R.
Barnaś, J.

Powiązania:

https://bibliotekanauki.pl/articles/1386845.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.63.-b
75.75.-c

Opis:

Thermoelectric properties of silicene nanoribbons doped with magnetic impurity atoms are investigated theoretically for both antiparallel and parallel orientations of the edge magnetic moments. Spin density distribution and transport parameters have been determined by ab-initio numerical methods based on the density functional theory. Doping with magnetic atoms considerably modifies the spin density distribution, leading to a ground state with a non-zero magnetic moment. Apart from this, the spin thermopower can be considerably enhanced by the impurity atoms.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 505-507
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 4.

Tytuł:

Electron Mediated Mn-Mn Interaction in Quantum Dots

Autorzy:

Bak, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1428517.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.85.+t
85.75.-d

Opis:

We present a theoretical study of magnetic interaction in quantum dots with magnetic $Mn^{2+}$ in dot impurities. We show that gate voltage applied to the quantum dot shifts the centers of electron clouds. Exact formulae for the perturbed spin density allow us to derive expression for the change of the strength of the sp-d coupling. Estimations show that sp-d exchange integral is very sensitive to the gate voltage variations. Exact formulae for the change of the effective exchange integrals are derived. As the spin coded qubits are elements of the RAM memory, a part of the energy stored in magnetic coupling will be dissipated when information is written or erased. We estimate this energy and find it sufficiently large to destroy quantum coherence during quantum computing. Finally, we discuss the interdot spin coupling and show the effect of gate voltage operations on the spin intra- and interdot Ruderman-Kittel-Kasuya-Yosida coupling.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1219-1221
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 5.

Tytuł:

Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Bulk Alloys

Autorzy:

Przybył, A.
Pawlik, K.
Pawlik, P.
Gębara, P.
Wysłocki, J.

Powiązania:

https://bibliotekanauki.pl/articles/1387335.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.En
75.75.-c
75.75.Cd

Opis:

The aim of this paper was to study the phase constitution, magnetic properties and magnetization reversal processes in the rapidly solidified bulk (Pr,Dy)-(Fe,Co)-B alloys doped with Zr, Ti, Mn and Ni. The 3 mm outer diameter tubes samples of the $Pr₈Dy₁Fe₆₀Co₇Ni_{(6x)}MnₓB₁₄Zr₁Ti₃$ (where x = 0, 3, 6) alloys were produced by suction-casting technique. The admixture of Zr was introduced in order to improve their glass forming abilities while Dy was substituted to enhance the magnetocrystalline anisotropy of hard magnetic phase. The effect of Ni and Mn addition on the phase constitution and magnetic properties was studied in the presented work.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 579-581
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 6.

Tytuł:

Normal Modes in a Linear Chain of Nanomagnets

Autorzy:

Wal, A.
Dubiel, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/1032392.pdf

Data publikacji:

2017-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.75.Jn
71.70.Gm

Opis:

The dynamics of magnetization in low-dimensional systems of micromagnets has been a very interesting subject of scientific studies last years. Excitations in such systems may have forms of normal modes. The frequency of the mode can be determined with the use of analytical methods as well as of micromagnetic numerical techniques. One of the latter is the Hamiltonian dynamical matrix method. The method is an analogue of that used to determine oscillations of atoms in crystal. The advantage of it is the possibility of calculating both of all frequencies and profiles of normal modes. Excitations in a finite system can depend on the size of it, as was noticed by experimentalists. The aim of this study is an analysis of eigenstates of the chain consisting of finite numbers of nanomagnets and dependence of states on orientation of magnetic moments and external magnetic field.

Źródło:

Acta Physica Polonica A; 2017, 132, 1; 100-102
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 7.

Tytuł:

Spin-wave Instability Theory for Ferromagnetic Nanostructures

Autorzy:

Haghshenasfard, Z.
Nguyen, H.
Cottam, M.

Powiązania:

https://bibliotekanauki.pl/articles/1189207.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Ds
75.75.-c
75.78.-n

Opis:

A microscopic, or Hamiltonian-based, theory is outlined for studying the spin-wave instability thresholds of the parametric processes occurring in ferromagnetic nanostructures under conditions of pumping with a microwave field. Most previous work has concentrated on spheres or films with dimensions of order several μm or more, with the theoretical interpretation being made in terms of macroscopic (or continuum) methods. At smaller length scales, as in ultrathin films and nanowires with thickness or lateral dimensions less than about 100 nm, the discreteness of the quantized spin waves and their spatial distributions become modified, making it more appropriate to employ a microscopic approach to the nonlinear dynamics with a lattice of effective spins interacting through the magnetic dipole-dipole and exchange interactions. Effects of microwave pumping (in either the parallel or perpendicular configuration) are incorporated in calculations for the instability thresholds of the quantized spin-wave bands in different nanostructures and materials.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 192-197
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 8.

Tytuł:

Monte Carlo Simulations of Ferromagnetic Nanocomposites

Autorzy:

Woińska, M.
Majhofer, A.
Gosk, J.
Szczytko, J.

Powiązania:

https://bibliotekanauki.pl/articles/1403635.pdf

Data publikacji:

2012-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.40.Mg
75.50.Tt
75.75.-c

Opis:

We present results of Monte Carlo simulations of a model system of Co nanoparticles in an external magnetic field. In our simulations we take into account the interaction with the external magnetic field, the energy of crystallographic anisotropy and the dipole-dipole interactions between single domain nanoparticles. We apply the standard Metropolis algorithm to a cluster of 27 randomly distributed superparamagnetic Co nanoparticles. We investigate the dependence of blocking temperature $T_{B}$ on particle and cluster size.

Źródło:

Acta Physica Polonica A; 2012, 122, 6; 1019-1021
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 9.

Tytuł:

Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic $Fe_3C$ Particles

Autorzy:

David, B.
Schneeweiss, O.
Šantavá, E.
Morjan, I.

Powiązania:

https://bibliotekanauki.pl/articles/1507060.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Wx
75.50.Bb
75.75.-c

Opis:

Two nanopowders containing superparamagnetic $Fe_3C$ particles, superparamagnetic $Fe_3O_4//γ-Fe_2O_3$ particles and carbon black phase were synthesised by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of $Fe_3C$ was 3 nm for the first sample and 10 nm for the second sample. Mössbauer spectra measured at 27 K and zero-field cooled/field cooled curves measured down to 4 K are reported.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 766-767
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 10.

Tytuł:

Indirect Coupling Between Localized Magnetic Moments in Zero-Dimensional Graphene Nanostructures (Quantum Dots)

Autorzy:

Szałowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/1201877.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Hx
75.75.-c
73.22.Pr

Opis:

The indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between on-site magnetic impurities is studied for two kinds of graphene nanoflakes consisting of approximately 100 carbon atoms, posessing either zigzag or armchair edge. The tight-binding Hamiltonian with Hubbard term is used in non-perturbative calculations of coupling between the impurities, placed at the edge of the structure. In general, for zigzag-edged nanoflakes a pronounced coupling robust against charge doping is found, while for armchair-edged structures the interaction is weaker and much more sensitive to charge doping. Also the distance dependence of indirect exchange differs significantly for both edge forms.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 236-237
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 11.

Tytuł:

In-Plane Edge Magnetism in Graphene-Like Nanoribbons

Autorzy:

Krompiewski, S.
Cuniberti, G.

Powiązania:

https://bibliotekanauki.pl/articles/1032763.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.30.Gw
61.48.Gh

Opis:

This paper is devoted to identification of the most important factors responsible for formation of magnetic moments at edges of graphene-like nanoribbons. The main role is attributed to the Hubbard correlations (within unrestricted Hartree-Fock approximation) and intrinsic spin-orbit interactions, but additionally a perpendicular electric field is also taken into account. Of particular interest is the interplay of the in-plane edge magnetism and the energy band gap. It is shown that, with the increasing electric field, typically the following phases develop: magnetic insulator (with in-plane spins), nonmagnetic narrow-band semiconductor, and nonmagnetic band insulator.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 828-829
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 12.

Tytuł:

Spin Glass Dynamics of Nanoparticle $La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3$ Obtained by a Mechanochemical Milling

Autorzy:

Perovic, M.
Mrakovic, A.
Kusigerski, V.
Blanusa, J.
Spasojevic, V.

Powiązania:

https://bibliotekanauki.pl/articles/1534032.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.75.Jn
75.50.Lk

Opis:

Spin dynamics of nanoparticle $La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3$ system was studied through the set of diverse magnetic measurements. Analysis of the data obtained from magnetic relaxation measurements, memory effect and AC susceptibility experiments pointed to a spin glass like behavior of interacting nanoparticle system.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 813-814
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 13.

Tytuł:

Accents in Modern High Saturation Nanocrystalline Fe-Rich Alloys

Autorzy:

Butvinová, B.
Butvin, P.
Maťko, I.
Janičkovič, D.
Kuzminski, M.
Ślawska-Waniewska, A.
Švec, P.
Chromčíková, M.

Powiązania:

https://bibliotekanauki.pl/articles/1030276.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.60.-d
75.75.-c

Opis:

Post processing limits for iron-rich Fe-Cu-Si-B-P high-induction rapidly-quenched ribbons have been tested. 530°C/20 min is already too much, formed borides being the essential culprit of magnetic properties deterioration. Unlike standard Si-poor Fe-Nb-Cu-B-Si Finemets, these alloys annealed even in "technical" Ar below the upper limit do not create significant squeezing surfaces.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 711-713
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 14.

Tytuł:

Magnetic properties of hexagonal graphene nanomeshes

Autorzy:

Zwierzycki, M.
Ryndyk, D.

Powiązania:

https://bibliotekanauki.pl/articles/1054780.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.22.Pr
75.75.-c
72.25.Dc

Opis:

Graphene nanomeshes are the nanostructures consisting of graphene flake with a regular pattern of antidots (holes) punched through it. Thanks to the energy gaps opening in electronic spectrum, nanomesh-based transistors offer improved I_{on}/I_{off} ratio of the collector current while supporting up to 100 larger driving currents than nanoribbon-based devices. In this paper the electronic and magnetic structure of graphene nanomeshes with hexagonally shaped antidots was studied. It has been found that the internal zigzag edges support magnetic moments and that lowest energy magnetic configuration is antiferromagnetic. The density of states calculated for ground state configuration exhibit the energy gap which can be substantially reduced upon switching (e.g. by external magnetic field) to ferromagnetic configuration. Based on this we predict that the structure will exhibit magnetoresistive effect, which makes graphene nanomeshes of this kind relevant for spintronic applications.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 830-832
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 15.

Tytuł:

Effect of the sign of anisotropy constants on the properties of the system of interacting ferromagnetic nanoparticles

Autorzy:

Sadek, M.
Marchwiany, M.
Woinska, M.
Majhofer, A.
Gosk, J.
Twardowski, A.
Szczytko, J.

Powiązania:

https://bibliotekanauki.pl/articles/1159850.pdf

Data publikacji:

2016-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.40.Mg
75.50.Tt
75.75.-c

Opis:

We use the Monte Carlo simulation method to investigate the influence of the signs of magnetocrystalline anisotropy constants and the magnetic dipole-dipole interactions on the zero field cooled-field cooled magnetization experiments and hysteresis curves of a system of magnetic nanoparticles. Positive first cubic anisotropy constant K₁ results in larger blocking temperatures and larger coercive fields of a system, while the second anisotropy constant K₂ is practically of negligible importance for the phenomena investigated. Magnetic dipole-dipole interactions are important only in the most dense systems of particles and their effects practically disappear for systems where the distance between the closest particles exceeds three particle diameters.

Źródło:

Acta Physica Polonica A; 2016, 129, 1a; A-53-A-55
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 16.

Tytuł:

Structural and Thermophysical Properties of Magnetic Beads Containing Metallic Nanocrystallites

Autorzy:

Izydorzak, M.
Leonowicz, M.
Skumiel, A.

Powiązania:

https://bibliotekanauki.pl/articles/1490752.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Bb
75.75.-c
81.07.-b

Opis:

Cobalt, iron, nickel and iron carbide nanocrystallites, stabilized within carbon beads, were prepared by the three-step procedure including formation of metal acrylamide complex, followed by frontal polymerization and pyrolysis of the polymer at various temperatures. The beads containing the nanocrystallites exhibit domination of the ferromagnetic ordering. The analysis of calorimetric results allowed estimation of the efficiency of the hyperthermal effect, under the influence of an alternating magnetic field. The XTT tests show that the extracts prepared on the basis of the $Fe_3C$ containing beads are nontoxic, whereas these made of the composites containing Co and Ni exhibit negligible cytotoxicity for the test article/vehicle ratios 6.25 and 3.125 mg/ml.

Źródło:

Acta Physica Polonica A; 2012, 121, 1; 68-70
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 17.

Tytuł:

Influence of Nb Addition on Magnetic Properties of the Nanocrystalline $(Nd₁₀Fe₆₇B₂₃)_{100-x}Nbₓ$ (where x = 1, 2, 4) Alloy Ribbons

Autorzy:

Szwaja, M.
Pawlik, K.
Pawlik, P.
Gębara, P.
Michalski, B.

Powiązania:

https://bibliotekanauki.pl/articles/1387907.pdf

Data publikacji:

2015-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.En
75.75.-c
75.75.Cd

Opis:

In the present work the magnetic properties and phase constitution of $(Nd₁₀Fe₆₇B₂₃)_{100-x}Nbₓ$ (where x = 1, 2, 4) alloys in the form of ribbons were investigated. The base alloys were prepared by arc-melting the high purity elements with pre-alloyed Fe-B under an Ar atmosphere. The ribbon samples were obtained by controlled atmosphere melt-spinning technique. In order to generate the nanocrystalline microstructure and hard magnetic properties, samples were annealed at various temperatures (from 923 K to 1023 K) for 5 min. The aim of the present work was to determine the influence of Nb admixture and annealing conditions on the phase constitution and magnetic properties.

Źródło:

Acta Physica Polonica A; 2015, 127, 2; 623-625
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 18.

Tytuł:

Magnetic Behaviour of Ferritin Nanoparticles

Autorzy:

Miglierini, M.
Lancok, A.

Powiązania:

https://bibliotekanauki.pl/articles/1534808.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.80.+y
31.30.Gs
75.75.-c

Opis:

Characterization of magnetic behaviour of ferritin nanoparticles of biological origin is presented. Two types of samples prepared from human and horse spleen tissues were investigated by $\text{}^{57}Fe$ Mössbauer spectrometry. At room temperature, ferritin nanoparticles exhibit superparamagnetic behaviour due to their small dimensions. First occurrence of magnetic interactions was noticed below 60 K. Blocking temperature of human and horse ferritin nanoparticles was determined to be of 16 K and 32 K, respectively.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 944-945
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 19.

Tytuł:

Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials

Autorzy:

Cherkezova-Zheleva, Z.
Zaharieva, K.
Buchkov, K.
Blagoev, B.
Mitov, I.

Powiązania:

https://bibliotekanauki.pl/articles/1382568.pdf

Data publikacji:

2014-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.60.-d
75.75.-c
82.80.Ej

Opis:

The presented study compares magnetic properties of Ni-doped magnetites $Ni_{0.5}^{2+}Fe_{0.5}^{2+}Fe_{2}^{3+}O_{4}$ to magnetite $(Fe_3O_4)$ sample. Physicochemical properties of materials were registered by means of X-ray powder diffraction, Mössbauer spectroscopy, saturation magnetization and physical properties measurement systems. It was obtained that used preparation procedures lead to synthesis of single phase spinel materials with close nanodimensional size about 8-12 nm. Mechanochemically synthesized sample shows better magnetic properties as lower blocking temperature of superparamagnetic state and minimal coercivity in comparison to other studied materials.

Źródło:

Acta Physica Polonica A; 2014, 126, 4; 912-915
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 20.

Tytuł:

Magnetoresistance of Electrochemically Produced NiFe and CoNiFe Nanowires

Autorzy:

Avcu, D.
Atalay, F.
Aydogmus, E.
Kaya, H.
Atalay, S.

Powiązania:

https://bibliotekanauki.pl/articles/1215584.pdf

Data publikacji:

2014-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Gf
81.15.Pq
75.75.-c

Opis:

CoNiFe and NiFe nanowires were electrochemically produced by dc electrodeposition on highly ordered porous anodic alumina oxide templates. Scanning electron microscope images of nanowires after removing the alumina membrane showed that these nanowires are uniform with the diameters of about 220-300 nm and about 25-30 μm length. The energy dispersive X-ray analysis showed that the composition of the nanowires is $Ni_{88}Fe_{12}$, $Co_7Ni_{82}Fe_{11}$. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.

Źródło:

Acta Physica Polonica A; 2014, 125, 2; 230-231
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 21.

Tytuł:

Magnetic Properties of "As-Prepared" and Chemically Modified Multiwalled Carbon Nanotubes

Autorzy:

Kuryliszyn-Kudelska, I.
Małolepszy, A.
Mazurkiewicz, M.
Stobinski, L.
Dobrowolski, W.

Powiązania:

https://bibliotekanauki.pl/articles/2047920.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.48.De
81.20.Ym
75.75.-c

Opis:

In this work we have studied the structural and magnetic properties of "as-prepared" multiwalled carbon nanotubes, synthesized by the chemical vapor deposition method, and chemically modified multiwalled carbon nanotubes. Transmission electron microscopy was used to show multiwalled carbon nanotubes structure. The results of systematic magnetic property measurements on multiwalled carbon nanotubes are presented. The static and dynamic magnetic responses, such as the temperature dependence of the linear AC susceptibility and DC magnetization up to 9 T were studied. We have observed significant changes in magnetic AC susceptibility and magnetization for "as-prepared" and chemically modified multiwalled carbon nanotubes samples.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 597-599
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 22.

Tytuł:

Magnetoimpedance Effects in Electrodeposited NiFe Nanowire Array

Autorzy:

Aydogmus, E.
Kaya, H.
Atalay, F.
Atalay, S.
Avcu, D.

Powiązania:

https://bibliotekanauki.pl/articles/1207745.pdf

Data publikacji:

2014-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Gf
81.15.Pq
75.75.-c

Opis:

In this work, NiFe nanowires were grown in highly ordered porous anodic alumina oxide templates by dc electrodeposition at a pH value of 2.6. Scanning electron microscopy showed that wires have diameters of about 250-310 nm and length 25-30 μm. The energy dispersive X-ray analysis showed that the composition of the nanowires is $Ni_{65}Fe_{35}$. Electrical contacts were made on both sides of the nanowire array and their magnetoimpedance properties were investigated. All the magnetoimpedance curves showed single peak behavior due to the high shape anisotropy. The maximum magnetoimpedance change at the 79 MHz driving current frequency was ≈ 1.45%.

Źródło:

Acta Physica Polonica A; 2014, 125, 2; 227-229
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 23.

Tytuł:

Magnetoresistance of Electrodeposited Co/Cu Multilayer Nanowires

Autorzy:

Avcu, D.
Atalay, F.
Atalay, S.
Kaya, H.
Aydogmus, E.

Powiązania:

https://bibliotekanauki.pl/articles/1401297.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Gf
81.15.Pq
75.75.-c

Opis:

Co/Cu multilayer nanowires were electrodeposited potentiostatically on highly ordered porous anodic alumina oxide templates. Scanning electron microscopy (SEM) showed that wires have diameters of about 250-300 nm and length of 40-50 μm. Co/Cu multilayer nanowire arrays embedded in anodic alumina oxide were mechanically polished with diamond in a suspension of oil until the wires appeared. Then the top and bottom surfaces of the material were coated with a layer of Au with a thickness of 100 nm for electrical contacts. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1115-1117
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 24.

Tytuł:

Magnetism of Nanoparticle $La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3$ under Applied Hydrostatic Pressure

Autorzy:

Kusigerski, V.
Perovic, M.
Mrakovic, A.
Blanusa, J.
Mihalik, M.
Zentkova, M.
Spasojevic, V.

Powiązania:

https://bibliotekanauki.pl/articles/1534028.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Tt
75.75.-c
81.07.Bc

Opis:

Nanoparticle $La_{0.7}Ca_{0.3}Mn_{0.7}Fe_{0.3}O_3$ with the average particle size of 10 nm was mechanochemically synthesized in the single-step procedure. Temperature and field dependences of magnetization were recorded under both ambient and applied hydrostatic pressure up to 0.47 GPa. At ambient pressure, two magnetic transition points were observed: one of the spin-glass like type at the temperature $T_{f}$ ≈ 34 K, and ferro-to-paramagnet transition at $T_{C}$ ≈ 51 K. Under the applied pressure magnetic parameters gradually changed: (i) both $T_{C}$ and $T_{f}$ were lowered with the increase in pressure; (ii) both high field magnetization $M_{5T}$ and remanent magnetization $M_{Rem}$ decreased with pressure; (iii) coercivity $H_{C}$ increased with pressure. The obtained results show that magnetism of a nanoparticle system with high degree of intrinsic disorder diminishes with the applied pressure that is in compliance with the effect of the increased cationic disorder ("internal pressure") in bulk manganites.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 811-812
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 25.

Tytuł:

Fabrication and Study of the Magnetic Properties of $(Fe_{30}Co_{70})_{100-x}Zn_{x}$ Nanowire Arrays

Autorzy:

Sedghi, A.
Zolfi, F.
Vali Aghaie, S.

Powiązania:

https://bibliotekanauki.pl/articles/1400557.pdf

Data publikacji:

2015-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.Gf
81.15.Pq
75.75.-c

Opis:

$(Fe_{30}Co_{70})_{100-x}Zn_{x}$ (0 ≤ x ≤ 10) nanowires with diameters of ≈ 37 nm have been fabricated by AC electrodeposition into pores of anodized aluminum oxide (AAO) templates. The $Fe_{30}Co_{70}$ and Zn contents of the nanowires have been adjusted by varying the ratio of $Fe_{30}Co_{70}$ and Zn ion concentrations in the electrolyte. The effect of the Zn content and annealing on the magnetic properties (e.g., coercivity and squareness) of nanowires arrays have been investigated using X-ray diffraction, scanning electron microscopy, and alternating gradient force magnetometer. X-ray diffraction patterns reveal that an increase in the concentration of Zn ions of the electrolyte results in significant reduction in coercivity and squareness. It was found that the magnetic properties of nanowires can be significantly improved by appropriate annealing process. The highest values for coercivity (2670 Oe) and squareness (0.99) have been obtained for nanowires electrodeposited using 95/5 and 98/2 $Fe_{30}Co_{70}:Zn$ concentrations at annealing temperatures of 575°C and 550°C, respectively.

Źródło:

Acta Physica Polonica A; 2015, 127, 6; 1706-1711
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 26.

Tytuł:

Magnetic Properties of $V_{2}O_{3}$ Nanooxide Prepared Mechanochemically With and Without Salt Matrix

Autorzy:

Dvurečenskij, A.
Billik, P.
Cigáň, A.
Bystrický, R.
Maňka, J.
Škrátek, M.
Majerová, M.

Powiązania:

https://bibliotekanauki.pl/articles/1372489.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

85.25.Dq
75.75.-c
61.46.+w

Opis:

We present a new technological route of synthesis of $V_{2}O_{3}$ nanocrystals based on mechanochemical reduction of $V_{2}O_{5}$ with $Na_{2}SO_{3}$ as a reductant, followed by low temperature vacuum annealing. The structural and magnetic properties of the $V_{2}O_{3}$ nanocrystals were studied.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 398-399
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 27.

Tytuł:

The Novel Multichannel Single Photon Correlations Technique Applied for the Spin Dynamics Study of a Few Mn^{2+} Ions in a CdTe/ZnTe Quantum Dot

Autorzy:

Malinowski, F.
Koperski, M.
Goryca, M.
Smoleński, T.
Golnik, A.
Kossacki, P.
Wojnar, P.

Powiązania:

https://bibliotekanauki.pl/articles/1399084.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.Hc
72.21.La
75.75.-c

Opis:

In this work we demonstrate a novel experimental approach to the study of single photon correlations. The introduction of the multichannel detection setup enables the simultaneous measurement of a large number of correlation functions for photons emitted from different energetic ranges. The advantages of this new approach were exploited in a detailed study of the biexciton-exciton recombination cascade in CdTe/ZnTe quantum dots doped with a few $Mn^{2+}$ ions. The information about the dynamics of the magnetic system in the quantum dot during the lifetime of the exciton was obtained from the analysis of the correlation functions.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 791-794
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 28.

Tytuł:

Frustration Measure for Molecular Magnets with Single-Ion Anisotropy

Autorzy:

Kozłowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/1030687.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.45.+j
75.50.Xx
75.75.-c
03.67.Mn

Opis:

The universal frustration measure and its extension to anisotropic systems is calculated for a family of spin Hamiltonians modeling a hypothetical ring-shaped chromium-based molecular magnets. The proposed extension takes into account the impact of single-ion anisotropy on the magnetic centers and behaves more consistently with respect to the isotropic counterpart. The influence of anisotropy on both measures is assessed, which leads to a conclusion that frustration decreases with increasing absolute value of single ion anisotropy.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 423-425
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 29.

Tytuł:

Thickness Dependence of Mössbauer Parameters for Fe₇₈Si₉B₁₃ Metallic Glass Ribbons

Autorzy:

Amini, N.
Miglierini, M.
Hasiak, M.
Dekan, J.
Habibi, S.

Powiązania:

https://bibliotekanauki.pl/articles/1032172.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Kj
75.60.Ej
75.75.-c
76.80.+y

Opis:

Changes in magnetic microstructure of Fe₇₈Si₉B₁₃ ribbons were investigated by the Mössbauer spectrometry as a function of their thickness. The latter decreases inversely with the quenching wheel velocity. Amorphicity of the samples was checked by X-ray diffraction and the Mössbauer spectrometry. Average values of hyperfine magnetic fields do not appreciably differ with the production velocity. On the other hand, notable deviations are observed in the position of a net magnetic moment. After annealing with moderate temperature, the magnetic anisotropy improves as indicated by an increase of the average value of hyperfine magnetic field. However, magnetic moments turn out of the ribbon plane and this process continues towards higher production velocity, i.e., smaller thickness of the ribbons. No appreciable deviations in the investigated Mössbauer parameters were revealed after annealing during different time intervals.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 666-668
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 30.

Tytuł:

Magnetic Properties of Epitaxial Fe/(Ga,Mn)As Hybrids

Autorzy:

Kalbarczyk, K.
Dziatkowski, K.
Szczytko, J.
Gosk, J.
Tokarczyk, M.
Kowalski, G.
Twardowski, A.
Bednarski, W.
Ostrowski, A.
Waplak, S.
Martinek, J.
Liu, X.
Furdyna, J.

Powiązania:

https://bibliotekanauki.pl/articles/1399140.pdf

Data publikacji:

2013-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.30.Gw
75.50.Pp
75.50.Bb

Opis:

Thin-film structures composed of two kinds of ferromagnetic material - metallic Fe and semiconducting (Ga,Mn)As - were investigated by means of SQUID magnetometry and ferromagnetic resonance spectroscopy. Dependence of remnant magnetic moment on temperature showed unexpected anisotropic features when recorded along two orthogonal in-plane directions. For one of these orientations, the change in sign of the slope of m(T) curve at the Curie point of (Ga,Mn)As was observed, while for the other, an analogous m(T) curve retained monotonic character. Based on the comparison with ferromagnetic resonance data, the apparent non-monotonicity was attributed to the temperature-induced change of balance between the external magnetic field and uniaxial magnetic anisotropy in the plane of Fe layer.

Źródło:

Acta Physica Polonica A; 2013, 124, 5; 873-876
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 31.

Tytuł:

Mössbauer Studies of Core-Shell Nanoparticles.

Autorzy:

Kalska-Szostko, B.
Cydzik, M.
Satuła, D.
Giersig, M.

Powiązania:

https://bibliotekanauki.pl/articles/1506313.pdf

Data publikacji:

2011-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

82.80.Ej
81.07.-b
75.75.-c
81.16.-c

Opis:

The ferrite magnetic nanoparticles with core-shell structures were obtained in two step preparation process. The Mössbauer spectra obtained for particles of pure maghemite or magnetite and two layered core-shell one the magnetite on maghemite and maghemite on magnetite are very different from each other. The presented results show that interparticle and intraparticle interaction plays important role in overall magnetic properties as well.

Źródło:

Acta Physica Polonica A; 2011, 119, 1; 15-17
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 32.

Tytuł:

Effects of Intrinsic Forces in Toroidal Cores Wound of Soft-Magnetic Ribbons

Autorzy:

Butvinová, B.
Butvin, P.
Švec, P.
Chromčíková, M.
Vlasák, G.

Powiązania:

https://bibliotekanauki.pl/articles/1534033.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.20.En
75.60.Ej
75.75.-c
81.40.-z

Opis:

Magnetic anisotropy as shown by hysteresis loops of tape-wound toroidal cores has been inspected as to the specific response of the anisotropy to core-internal forces during and after annealing. The loops of toroids are compared to that of strip samples annealed together in various ambience. The core-internal forces were manipulated by means of different core construction, too. The results show that it is the heterogeneity, which produces the most effective forces. Different annealing-induced ribbon shrinkage makes the cores effectively heterogeneous and governs their magnetic response, whereas inherent ribbon heterogeneity affects the core properties, too, and is essential for homogeneous cores.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 815-817
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 33.

Tytuł:

Magnetic Properties of the Nanocrystalline $DyMnO_{3}$ Compound

Autorzy:

Dyakonov, V.
Szytuła, A.
Baran, S.
Kravchenko, Z.
Zubov, E.
Iessenchuk, O.
Bazela, W.
Dul, M.
Zarzycki, A.
Szymczak, H.

Powiązania:

https://bibliotekanauki.pl/articles/1538453.pdf

Data publikacji:

2010-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.05.cp
75.47.Lx
75.50.Ee
75.75.-c

Opis:

We report on the X-ray powder diffraction and magnetic measurements of the polycrystalline and the two nanocrystalline samples of $DyMnO_{3}$ compound synthesized at temperatures of 800 and 850°C. All samples at room temperature crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters determined change only slightly with preparation methods but the average grains size of the nanoparticles determined from X-ray data increases significantly with increasing annealing temperature. Temperature dependence of the magnetic susceptibility indicates the antiferromagnetic order in Dy sublattice at low temperatures.

Źródło:

Acta Physica Polonica A; 2010, 117, 4; 607-610
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 34.

Tytuł:

Characterization of Carbon Nanotubes

Autorzy:

Jeníková, M.
Zakuťanská, K.
Kováč, J.
Girman, V.
Kopčanský, P.
Tomašovičová, N.

Powiązania:

https://bibliotekanauki.pl/articles/1032760.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.48.De
74.25.nd
68.37.Lp
75.75.-c

Opis:

The aim of the presented work was to characterize single-walled carbon nanotubes as well as multi-walled carbon nanotubes by transmission electron microscopy, the Raman spectroscopy and magnetization measurements to obtain information about their size, structure, and magnetic properties. We show that having different carbon nanotubes one can easily distinguish the single-wall or multi-wall carbon nanotubes and determine their quality. The obtained results show that carbon nanotubes can be diamagnetic or ferromagnetic depending on their structural parameters.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 952-954
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 35.

Tytuł:

Transformation of Hyperfine Interactions in Co-Substituted Nanoperm-Type Alloys during Annealing

Autorzy:

Hatala, T.
Miglierini, M.

Powiązania:

https://bibliotekanauki.pl/articles/1507056.pdf

Data publikacji:

2010-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.80.+y
71.55.Jv
42.25.Fx
75.75.-c

Opis:

Structure and magnetic order of rapidly quenched $(Fe_{1-x}Co_{x})_{79}Mo_8Cu_1B_{12}$ alloys is investigated by $\text{}^{57}Fe$ Mössbauer spectrometry in transmission geometry and by conversion electron Mössbauer spectrometry. The effect of heat treatment upon hyperfine interactions was studied as a function of Co contents (x = 0, 0.5). Magnetic dipole interactions developed in both alloys when sufficient number of ferromagnetic nanograins is created after heat treatment. The kinetics of crystallization was derived from in situ diffraction of synchrotron radiation. The progress of crystallization is different at both sides of the ribbon-shaped samples.

Źródło:

Acta Physica Polonica A; 2010, 118, 5; 764-765
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 36.

Tytuł:

Size Dependence of Magnetic and Optical Properties of $Co_3O_4$ Nanoparticles

Autorzy:

Sarfraz, A.
Hasanain, S.

Powiązania:

https://bibliotekanauki.pl/articles/1206616.pdf

Data publikacji:

2014-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Gc
61.05.cp
75.75.-c
78.66.-w

Opis:

The effect of particle size on the magnetic and optical properties of cobalt oxide $Co_3O_4$ has been investigated. Single phase $Co_3O_4$ nanoparticles were synthesized by co-precipitation route and their structure was confirmed through X-ray diffraction analysis. The average crystallite sizes of the nanoparticles as determined from the X-ray diffraction were found to lie in the range of 13 to 59 nm. At room temperature these particles show paramagnetic response and the DC magnetic moment of the samples showed an increasing trend with increasing particle size. Both the antiferromagnetic Néel temperature $T_{N}$ and the low temperature moment depict finite size effects in the AC susceptibility measurements. The optical absorption studies show that there are two direct band gaps in $Co_3O_4$, the main energy band gap and a sub-band located inside the main energy gap. The values of these energy band gaps for the 45 nm particles were determined to be 3.15 and 1.76 eV, respectively. The direct band gap in these particles clearly shows a blue shift with decreasing size attributable to the quantum confinement effect.

Źródło:

Acta Physica Polonica A; 2014, 125, 1; 139-144
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 37.

Tytuł:

Temperature behaviour of hyperfine magnetic fields in a Fe-Co-Si-B-Mo-P metallic glass followed with ⁵⁷Fe Mössbauer spectrometry

Autorzy:

Cesnek, M.
Miglierini, M.
Kmječ, T.
Kohout, T.
Amini, N.
Janičkovič, D.
Matúš, P.

Powiązania:

https://bibliotekanauki.pl/articles/1053048.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Kj
75.60.Ej
75.75.-c
76.80.+y

Opis:

Amorphous glass with nominal chemical composition Fe₅₁Co₁₂Si₁₆B₈Mo₅P₈ was studied by combination of the Mössbauer spectroscopy and magnetic measurements in order to characterize magnetic and structural features. Temperature evolution of the Mössbauer spectra revealed presence of broad distribution of hyperfine magnetic field at lower temperatures which vanishes with increase of temperature. The Curie temperature estimated from the Mössbauer spectroscopy experiments is T_{C} ≈ 392 K. This value is in a good agreement with that obtained by magnetic measurements (T_{C}=397 K). The Mössbauer spectroscopy spectra of the sample annealed at 823 K revealed a presence of crystalline components. This temperature is notably lower than the expected temperature of the onset of crystallization observed by differential scanning calorimetry ( ≈ 835 K).

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 744-746
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 38.

Tytuł:

Dependence of Ultrasonic and Magnetic Hyperthermia on the Concentration of Magnetic Nanoparticles

Autorzy:

Kaczmarek, K.
Hornowski, T.
Bielas, R.
Żak, D.
Timko, M.
Józefczak, A.

Powiązania:

https://bibliotekanauki.pl/articles/1030383.pdf

Data publikacji:

2018-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
43.35.Cg
43.35.Wa
87.85.-d

Opis:

Hyperthermia treatment is the heating of tumor tissue up to temperatures between 41°C and 45°C, which trigger several physiological reactions in the body. Hyperthermia within tissue can be applied through various mechanisms. One of them is magnetic hyperthermia which uses superparamagnetic iron oxide nanoparticles (SPIONs) heated by an externally applied magnetic field. SPIONs can also be used as sonosensitizers in ultrasound hyperthermia increasing acoustic wave attenuation. The impact of SPION concentration on thermal effect during ultrasonic and magnetic hyperthermia was investigated in agar-gel phantom with added magnetite nanoparticles. The presence of nanoparticles in the tissue-mimicking phantom increases the thermal losses of ultrasound energy and temperature of the phantom.

Źródło:

Acta Physica Polonica A; 2018, 133, 3; 716-718
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 39.

Tytuł:

Exciton Binding Energy and Oscillator Strength in a Shallow Quantum Well in an External Magnetic Field

Autorzy:

Zięba, P.
Piętka, B.
Łusakowski, J.
Tralle, I.

Powiązania:

https://bibliotekanauki.pl/articles/1402589.pdf

Data publikacji:

2015-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.35.Ji
75.75.-c
73.21.Fg
62.20.-x

Opis:

We discuss the influence of an external magnetic field on the exciton energy and the exciton oscillator strength in the shallow quantum wells. We include into consideration the Coulomb attraction between electron and hole, which is rarely taken into account. We self-consistently solve the Schrödinger equation to compare the obtained results with the experimental values.

Źródło:

Acta Physica Polonica A; 2015, 128, 2; 237-239
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 40.

Tytuł:

Type-II InAs/GaAsSb/GaAs Quantum Dots as Artificial Quantum Dot Molecules

Autorzy:

Klenovský, P.
Křápek, V.
Humlíček, J.

Powiązania:

https://bibliotekanauki.pl/articles/1398560.pdf

Data publikacji:

2016-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.21.La
75.75.-c
85.35.Be
68.65.Hb

Opis:

We have studied theoretically the type-II GaAsSb capped InAs quantum dots for two structures differing in the composition of the capping layer, being either (i) constant or (ii) with Sb accumulation above the apex of the dot. We have found that the hole states are segmented and resemble the states in the quantum dot molecules. The two-hole states form singlet and triplet with the splitting energy of 4 μeV/325 μeV for the case (i)/(ii). We have also tested the possibility to tune the splitting by vertically applied magnetic field. Because the predicted tunability range was limited, we propose an approach for its enhancement.

Źródło:

Acta Physica Polonica A; 2016, 129, 1a; A-62-A-65
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 41.

Tytuł:

Temperature of a Single Mn Atom in a CdTe Quantum Dot

Autorzy:

Papierska, J.
Goryca, M.
Wojnar, P.
Kossacki, P.

Powiązania:

https://bibliotekanauki.pl/articles/1791341.pdf

Data publikacji:

2009-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.Hc
71.70.Gm
78.55.Et
75.75.-c

Opis:

In this work we present a study of the temperature of the single magnetic atom embedded in a semiconductor quantum dot versus excitation power and magnetic field. This temperature is defined by the thermal distribution of spin states of single Mn ion, and results from its interaction with the neighborhood. This temperature was found to be much higher than the temperature of the thermal bath. Its dependence on the excitation power and magnetic field is discussed.

Źródło:

Acta Physica Polonica A; 2009, 116, 5; 899-900
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 42.

Tytuł:

Mössbauer and SQUID Characterization of Iron in Human Tissue: Case of Globus Pallidus

Autorzy:

Miglierini, M.
Boča, R.
Kopáni, M.
Lančok, A.

Powiązania:

https://bibliotekanauki.pl/articles/1382185.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

76.80.+y
31.30.Gs
75.75.-c
87.85.jc

Opis:

Lyophilized samples of human brain tissue from the region of Globus Pallidus were investigated in powder form by $\text{}^{57}Fe$ Mössbauer spectroscopy and SQUID magnetometry. The obtained hyperfine parameters including isomer shift and quadrupole splitting exhibit a ferritin-like behaviour with high-spin Fe(III) sites. Three types of features were derived from temperature development of magnetic susceptibility: dominating diamagnetism, dominating paramagnetism, and intermediate states. The magnetic characteristics of the samples do not correlate with age of the donors.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 240-241
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 43.

Tytuł:

Magnetization Dynamics of a (Cd,Mn)Te Quantum Well in Pulsed Magnetic Field

Autorzy:

Kobak, J.
Goryca, M.
Kossacki, P.
Golnik, A.
Karczewski, G.
Wojtowicz, T.
Gaj, J.

Powiązania:

https://bibliotekanauki.pl/articles/1791344.pdf

Data publikacji:

2009-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.67.Hc
71.70.Gm
78.55.Et
75.75.-c

Opis:

In this paper we present studies of magnetization relaxation in a (Cd,Mn)Te quantum well containing 3.2% of Mn, after a pulse of magnetic field. The relaxation was found to be very fast, with dominant component faster than 10 ns. Upon application of static magnetic field the relaxation does not slow down, in contrast with the behavior of very diluted quantum wells or bulk material.

Źródło:

Acta Physica Polonica A; 2009, 116, 5; 907-908
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 44.

Tytuł:

Magnetoluminescence of a CdTe Quantum Dot with a Single Manganese Ion in Voigt Configuration

Autorzy:

Koperski, M.
Goryca, M.
Kazimierczuk, T.
Kossacki, P.
Wojnar, P.
Gaj, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/2047960.pdf

Data publikacji:

2011-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.21.La
75.75.-c
78.55.Et
78.67.Hc

Opis:

We present a study of the neutral exciton and negative trion recombination spectra of an individual CdTe quantum dot with a single manganese ion, in magnetic field measured in the Voigt configuration. We describe experimental results and compare with a theoretical model. The quantitative agreement between the model and the experiment allows us to determine separately the electron g-factor.

Źródło:

Acta Physica Polonica A; 2011, 119, 5; 618-620
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 45.

Tytuł:

Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

Autorzy:

Prida, V.M.
Salaheldeen, M.
Pfitzer, G.
Hidalgo, A.
Vega, V.
González, S.
Teixeira, J.
Fernández, A.
Hernando, B.

Powiązania:

https://bibliotekanauki.pl/articles/1032144.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.30.Gw
75.70.Kw
75.75.-c
75.70.-i
75.70.Rf

Opis:

The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 822-827
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 46.

Tytuł:

Preparation and Magnetic Characteristics of $Co_{1-δ}Zn_{δ}Fe_2O_4$ Ferrite Nanopowders

Autorzy:

Kubisztal, M.
Herok, I.
Karolus, M.
Prusik, K.
Haneczok, G.

Powiązania:

https://bibliotekanauki.pl/articles/1398315.pdf

Data publikacji:

2017-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.47.Lx
75.50.Gg
75.50.Tt
75.75.-c
75.75.Cd

Opis:

In the present paper the $Co_{1-δ}Zn_{δ}Fe_2O_4$ (0 ≤ δ ≤ 1) ferrite nanopowders with a spinel type structure were synthesized using a chemical co-precipitation technique with constant flow rate $ν _{FR}$=120 cm³/min at three different reaction temperatures i.e. $T_r$ =50°C, 70°C and 90°C. Magnetic and structural characteristics of the obtained materials were investigated by means of X-ray diffraction method, transmission electron microscopy and vibrating sample magnetometer. In the course of studies hysteresis loops M(μ₀H) and the relations of magnetization $M_{7T}$ (determined at $\text{}_{μ0}H $=7 T), squareness ratio S and the Néel temperature $T_{N}$ versus Zn content were determined and discussed in detail. It was shown that for δ<0.6 the increase in reaction temperature $T_r$ results in a significant increase of the measured magnetic characteristics. In particular, in the case of $Co_{0.8}Zn_{0.2}Fe_2O_4$ ferrite nanopowder magnetization $M_{7T}$ reaches maximal value of about 80 emu/g.

Źródło:

Acta Physica Polonica A; 2017, 131, 5; 1236-1239
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 47.

Tytuł:

Fine Smoothing of Conductive Substrate for Permalloy Layer Electroplating

Autorzy:

Butta, M.
Janosek, M.
Pilarcikova, I.
Kraus, L.

Powiązania:

https://bibliotekanauki.pl/articles/1201077.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.30.-m
75.50.-y
07.55.-w
75.70.-i

Opis:

In this paper we study the influence of the roughness of the copper substrate on the magnetic properties of the FeNi film we electroplate onto it. The roughness and the thickness of the copper substrate are reduced by electropolishing in orthophosphoric acid: we show how to select the working point, which gives the highest smoothness, avoiding defects due to gas evolution. Finally we show how a smoother substrate contributes to reducing the coercivity of the magnetic film grown on it.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 150-151
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 48.

Tytuł:

Magnetic Hyperfine Fields of Nanoperm Alloys

Autorzy:

Miglierini, M.
Kohout, J.
Lančok, A.
Šafářová, K.

Powiązania:

https://bibliotekanauki.pl/articles/1428957.pdf

Data publikacji:

2012-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.50.Tt
75.75.-c
76.80.+y
76.60.-k
68.37.Rt

Opis:

Magnetic hyperfine fields of $Fe_{90}Zr_7B_3$ Nanoperm nanocrystalline alloy are characterized by $\text{}^{57}Fe$ Mössbauer spectrometry and $P^{57}Fe$ NMR as well as by magnetic force microscopy. $\text{}^{57}Fe$ NMR enables to distinguish a broad signal of iron atoms located in a residual amorphous matrix from a narrow one which belongs to Fe in nanograins. The former coincides with the distribution of hyperfine fields obtained from $\text{}^{57}Fe$ Mössbauer spectroscopy. In addition, it is possible to make a distinction between NMR signals of the Fe nanograins located in magnetic domains from that of the nanograins positioned in domain walls. This is confirmed by magnetic force microscopy where appearance of maze-domains is observed.

Źródło:

Acta Physica Polonica A; 2012, 121, 5-6; 1263-1265
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 49.

Tytuł:

Effects of Core Dimensions and Manufacturing Procedure on Fluxgate Noise

Autorzy:

Janošek, M.
Vyhnánek, J.
Zikmund, A.
Butvin, P.
Butvinová, B.

Powiązania:

https://bibliotekanauki.pl/articles/1367343.pdf

Data publikacji:

2014-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.75.-c
75.30.-m
75.50.-y
07.55.-w
75.70.-i

Opis:

The effect of demagnetizing factor and manufacturing procedure on noise of the fluxgate probes, manufactured from metallic glasses, is presented. The fluxgate probes were either tape-wound, or flat, wet-etched ringcore and race-track geometries. When combining low demagnetizing factor and high enough cross-section of the probe, a minimum in the noise dependence can be found. For 50 mm ringcores, in such minimum the noise value as low as $7 pT_{RMS}$ in 0.1-10 Hz frequency band was achieved, which is very low for an as-cast tape, and has not been reported before.

Źródło:

Acta Physica Polonica A; 2014, 126, 1; 104-105
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 50.

Tytuł:

Size dependent heating efficiency of multicore iron oxide particles in low-power alternating magnetic fields

Autorzy:

Smolkova, I.
Kazantseva, N.
Vitkova, L.
Babayan, V.
Vilcakova, J.
Smolka, P.

Powiązania:

https://bibliotekanauki.pl/articles/1054706.pdf

Data publikacji:

2017-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.47.Lx
75.50.Mm
75.60.Jk
75.75.-c
75.78.-n

Opis:

Aggregates of superparamagnetic nanoparticles, so called multicore particles get much attention due to collective magnetic behaviour. Despite the fact that saturation magnetization and coercivity of multicore particles are lower than for single particles of comparable size, they can generate large amount of heat in alternating magnetic field. This makes them promising for magnetic hyperthermia. However, correlation between internal magnetic structure of multicore particles and their heating ability in alternating magnetic fields are not clear yet. Detailed experimental investigations are required to determine the optimal sizes of multicore particles and the alternating magnetic field parameters to obtain maximal heat. In this study, we demonstrated how hydrodynamic size of multicore particles influences alternating magnetic field energy absorption. Dense aggregates composed of bare magnetic iron oxide nanoparticles of 13 nm were obtained by coprecipitation. Further peptization allowed to gain aqueous dispersions of multicore particles with various hydrodynamic size, varing from 85 to 170 nm, due to electrostatic stabilization. Multicore particles dispersions have saturation magnetization of 40 A m²/kg_{Fe₃O₄} and coercivity of 79.6 A/m regardless of their size. Dispersion of 85 nm multicore particles is stable and provides specific loss power of 42 W/g_{Fe}. Further increase of hydrodynamic size leads to low stability and loss of the ability to generate heat in alternating magnetic field.

Źródło:

Acta Physica Polonica A; 2017, 131, 4; 663-665
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce