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Wyszukujesz frazę "75.78.Cd" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Control of the Spin Wave Phase in Transmission through the Ultrathin Interface between Exchange Coupled Ferromagnetic Materials
Autorzy:
Mailian, M.
Gorobets, O.
Gorobets, Y.
Zelent, M.
Krawczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030386.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Kz
75.78.Cd
Opis:
In this paper, we show analytically and numerically, that the ultrathin metallic layer up to few monatomic layers separating two ferromagnetic media, which are exchange coupled, can effectively change the phase of the reflected or transmitted spin waves. Taking into account ground states with parallel orientations of the magnetization vectors, we developed the analytical model, which shows the possibility of spin-wave phase control by varying the exchange coupling strength between two ferromagnets. Moreover, we demonstrate with micromagnetic simulations that the effect still exists for the spin waves propagating in thin ferromagnetic film during the reflection or transmission from the interface, where interlayer exchange interactions are present.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 480-482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scaling Behaviour of Chirality Dependent Domain Wall Pinning in Planar Nanowires
Autorzy:
Eastwood, D.
Bogart, L.
Atkinson, D.
Powiązania:
https://bibliotekanauki.pl/articles/1506885.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.78.Cd
81.07.Gf
Opis:
Micromagnetic modelling is used to establish the dimensional scaling dependence of the magnetic fields required for domain wall injection and chirality dependent pinning in planar permalloy nanowires with asymmetric structural notches. The wire width, thickness and notch constriction width are systematically varied whilst the axial magnetization is reversed under a globally applied magnetic field. A component of magnetic field transverse to the direction of propagation is applied throughout the reversal to control the domain wall chirality, and therefore determine the strength of pinning at the notch. We deduce that thicker wires with a narrower width cause larger depinning fields and stronger chirality dependent pinning, an observation relevant for domain wall memory applications, and particularly those exploiting chirality dependent pinning in nanowires.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 719-722
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast Vortex Core Switching at Moderate Temperatures
Autorzy:
Lebecki, K.
Nowak, U.
Powiązania:
https://bibliotekanauki.pl/articles/1385566.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.60.Nt
75.78.-n
75.78.Cd
Opis:
Ferromagnetic vortex core switching is investigated using micromagnetic simulations. For that the OOMMF program is used together with a temperature extension we have developed recently. This is a continuum micromagnetic approach, where the well-known Landau-Lifshitz-Gilbert equation (valid for zero temperature) is replaced by the Landau-Lifshitz-Bloch equation. In our research we simulate switching of a ferromagnetic vortex core in a flat disk (diameter 200 nm, thickness 20 nm) with material parameters that resemble permalloy. Temperatures in the range 400 K to 700 K are considered. Switching itself is caused by application of a very short oscillating magnetic pulse. Parameters used resemble conditions met in the experiment: oscillation period 141 ps (equal to the peak width) and amplitude 60 mT. Surprisingly, no large temperature- or discretization dependence is found. Reasons for that are discussed.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 342-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Processes of Nanoparticles Embedded into Ferromagnetic Matrix
Autorzy:
Ziółkowski, G.
Chrobak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1387548.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.-d
75.78.Cd
Opis:
The paper refers to computer simulations of interactions between magnetically hard particle embedded into ultra-hard matrix. We used simulated annealing and Monte Carlo simulations in a frame of the 3D Heisenberg model. The performed simulations reveal that the particles show additional exchange anisotropy dependent on "frozen" spin direction in the matrix and the angle between matrix and particle easy magnetization axes. The particle-matrix coupling are responsible for multi-phase magnetic hysteresis shape and exchange-bias like effect.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 597-599
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fe₂O₃ and Gd₂O₃ Nanoparticles Embedded in Mesoporous Silica: Magnetic Properties Comparison
Autorzy:
Kapusta, O.
Zeleňáková, A.
Hrubovčák, P.
Girman, V.
Zeleňák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1031039.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.78.+s
47.11.Kb
75.75.Cd
75.40.Cx
78.20.-e
Opis:
Nanocomposite materials containing Fe₂O₃ and Gd₂O₃ nanoparticles with the same concentration were prepared by nanocasting method. At this procedure silica matrix serves as nanoreactor for growth of nanoparticles. Temperature and external dc field dependences of the magnetization both samples were compared. Composite containing Fe₂O₃ nanoparticles shows superparamagnetic behaviour with blocking temperature around 45 K. Otherwise, paramagnetic properties were observed for the sample with Gd₂O₃ (above 10 K). Additionally, due to free pores the silica matrix could serve as medium to increase the number of bonded water molecules. These properties together with appropriate magnetic characteristics make studied materials suitable for magnetic resonance imaging applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 860-862
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MBE Growth of CdTe/ZnTe Quantum Dots with Single Mn Ions
Autorzy:
Gietka, K.
Kobak, J.
Rousset, J.
Janik, E.
Słupiński, T.
Kossacki, P.
Golnik, A.
Pacuski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1403652.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
81.07.Ta
78.67.Hc
75.50.Pp
75.75.Cd
75.30.Hx
Opis:
We report MBE growth and properties of samples with self assembled quantum dots with single manganese ions and low density of quantum dots. Manganese concentration was calibrated using magneto-reflectivity measurements and the giant Zeeman effect in (Cd,Mn)Te and (Zn,Mn)Te layers. Successful incorporation of Mn in the CdTe/ZnTe quantum dots was confirmed using micro-photoluminescence measurements: single manganese ion in quantum dot manifests in sixfold splitting of exciton emission lines due to s, p-d exchange interaction.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1056-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cu Layer Thickness on Morphology and Magnetic Properties of Co/Cu Nanowires
Autorzy:
Kac, M.
Kopec, M.
Cieniek, L.
Zarzycki, A.
Kac, S.
Maximenko, A.
Dutkiewicz, E.
Marszalek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030657.pdf
Data publikacji:
2018-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.60.Ej
75.75.Cd
78.67.Rb
81.07.Gf
82.45.Qr
Opis:
We studied changes of morphology and magnetic properties of Co/Cu multilayered nanowires, electrodeposited in polycarbonate membranes, as a function of Cu layer thickness. The morphology and structure of wire assemblies with an average diameter of 200 nm and length of 10 μ m, investigated by X-ray diffraction and scanning electron microscopy techniques, revealed polycrystalline structure of Cu and Co layers with smooth lateral surface of nanowires. Overdeposited nanowires created caps which showed flower-like dendrites with shape changing as a function of Cu thickness and electrodeposition parameters. Chemical composition of Co and Cu nanowires analysed by energy dispersive spectroscopy and proton induced X-ray emission showed Cu nanowires free from Co atoms while in Co nanowires, Cu contamination with concentration below 10% was observed. The oxidation traces observed in single-component Cu nanowires did not appear in multilayered nanowires. Magnetic measurements indicated easy axis of magnetization in membrane plane for nanowires with Cu thickness smaller than 20 nm, whereas for larger Cu thicknesses isotropic orientation of magnetization was observed. The presence of Cu atoms in single-component Co nanowires resulted in the appearance of magnetic anisotropy with easy axis along nanowire axis and the increase of coercivity value.
Źródło:
Acta Physica Polonica A; 2018, 133, 2; 302-305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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