Published in
American Physical Society, Physical review B, 2(84)
DOI: 10.1103/physrevb.84.024407
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Crystallographically amorphous ferrimagnetic alloys: Comparing a localized atomistic spin model with experiments
,
Richard F. L. Evans,
Roy W. Chantrell ,
Unai Atxitia,
Oksana Chubykalo-Fesenko,
Ilie Radu,
Radu Abrudan ,
Florin Radu ,
Arata Tsukamoto,
A. Itoh,
Andrei Kirilyuk,
Theo H. M. Rasing,
Alexey Kimel
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Abstract
We present a computational model of crystallographically amorphous ferrimagnetic alloys using a stochastic Landau-Lifshitz-Gilbert equation of motion for atomistic spins and an atomistic spin Hamiltonian with Heisenberg exchange. The spontaneous equilibrium magnetization is calculated and a comparison with a mean field model is made. The simulations show excellent agreement with experiments on GdFeCo using x-ray magnetic circular dichroism to determine the individual sublattice magnetizations. The calculated temperature dependence of the magnetization shows a polarization of the Gd sublattice leading to a common Curie temperature, in agreement with the experimental data. The intersublattice exchange is shown to be an important energy transfer channel for ultrafast dynamics. ; Peer reviewed