Autor: Wal, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Artykuł

Skocz do pozycji: 2.

Tytuł:: Rarefied Band in Spectrum of Two-Magnon States of Heisenberg Ferromagnet of Clock Dial Plate
Autorzy:: Lulek, T.
Wal, A.
Powiązania:: https://bibliotekanauki.pl/articles/1933552.pdf
Data publikacji:: 1995-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.50.+q
75.30.Ds
02.20.-a
75.Jm
Opis:: The Heisenberg isotropic exchange Hamiltonian with the nearest neighbour interactions for the ring of N = 12 nodes (the clock dial plate) with the spin 1/2 has been diagonalized within the manifold of all 66 two-magnon excitations from the ferromagnetic ground state. The spectrum consists of 5 full bands, i.e. bands defined over the whole Brillouin zone, and a single band which is doubly rarefied, i.e. defined only for even values of quasimomentum. The rarefied band is found to be dispersionless outside the centre of the Brillouin zone. It separates two bands of "weakly bounded" spin waves from two other which are "weakly antibounded". The last remaining band is situated below this collection of scattered spin waves, and describes two tightly bounded spin deviations. The spectrum exhibits dispersion, but it is degenerate (singlet and quintet) at the boundary of the Brillouin zone.
Źródło:: Acta Physica Polonica A; 1995, 88, 2; 259-268
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Anisotropy of g_{eff} Factor for Ni_{50}Mn_{35.5}In_{14.5} Heusler Alloy
Autorzy:: Dubiel, Ł.
Wal, A.
Stefaniuk, I.
Powiązania:: https://bibliotekanauki.pl/articles/1398339.pdf
Data publikacji:: 2017-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.30.-v
75.20.En
32.10.Fn
Opis:: In this work electron magnetic resonance (EMR) spectra of off-stoichiometric $Ni_{50}Mn_{35.5}In_{14.5}$ Heusler alloy ribbons obtained by melt-spinning method were measured. The EMR measurements were performed on the X-band (9.36 GHz) spectrometer. Angle dependences were registered for three orientations of sample, with the use of uniaxial goniometer at 300. The results exhibited magnetic anisotropy and were used for calculating the principal values of g tensor.
Źródło:: Acta Physica Polonica A; 2017, 132, 1; 91-93
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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