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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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 |
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Departments - Does NOT include content added after October 2018: | Faculty of Science, Technology and Arts > Department of Engineering and Mathematics |
Identification Number: | https://doi.org/10.1103/PhysRevB.84.024407 |
Page Range: | 024407 |
Depositing User: | Thomas Ostler |
Date Deposited: | 27 Apr 2017 13:42 |
Last Modified: | 18 Mar 2021 04:17 |
URI: | https://shura.shu.ac.uk/id/eprint/15286 |
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