Crystallographically amorphous ferrimagnetic alloys : comparing a localized atomistic spin model with experiments

OSTLER, Thomas, EVANS, Richard F. L., CHANTRELL, Roy W., ATXITIA, Unai, CHUBYKALO-FESENKO, Oksana, RADU, Ilie, ABRUDAN, Radu, RADU, Florin, TSUKAMOTO, Arata, ITOH, A., KIRILYUK, A., RASING, Theo and KIMEL, A. V. (2011). Crystallographically amorphous ferrimagnetic alloys : comparing a localized atomistic spin model with experiments. Physical Review B, 84 (2), 024407.

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Ostler et al. - 2011 - Crystallographically amorphous ferrimagnetic alloys Comparing a localized atomistic spin model with experiments.pdf - Published Version
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Official URL: https://journals.aps.org/prb/abstract/10.1103/Phys...
Link to published version:: 10.1103/PhysRevB.84.024407

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.

Item Type: Article
Departments: Arts, Computing, Engineering and Sciences > Engineering and Mathematics
Identification Number: 10.1103/PhysRevB.84.024407
Depositing User: Thomas Ostler
Date Deposited: 27 Apr 2017 13:42
Last Modified: 27 Apr 2017 22:15
URI: http://shura.shu.ac.uk/id/eprint/15286

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