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ToolsOSTLER, 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. [Article]
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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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Ostler et al. - 2011 - Crystallographically amorphous ferrimagnetic alloys Comparing a localized atomistic spin model with experiments.pdf - Published Version
Available under License All rights reserved.
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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.
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