Computational Materials Science2022，Vol.2098.DOI:10.1016/j.commatsci.2022.111359

Spin-lattice dynamics simulation of the Einstein-de Haas effect

Dednam, W. Sabater, C. Lombardi, E. B. Fernandez-Rossier, J. Caturla, M. J. Botha, A. E.
Computational Materials Science2022，Vol.2098.DOI:10.1016/j.commatsci.2022.111359
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  • NSTL
  • Elsevier

Spin-lattice dynamics simulation of the Einstein-de Haas effect

Dednam, W. 1Sabater, C. 2Lombardi, E. B. 1Fernandez-Rossier, J. 3Caturla, M. J. 2Botha, A. E.1
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作者信息

  • 1. Univ South Africa
  • 2. Univ Alicante
  • 3. Int Iberian Nanotechnol Lab
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Abstract

The spin and lattice dynamics of a ferromagnetic nanoparticle are studied via molecular dynamics and with semi-classical spin dynamics simulations where spin and lattice degrees of freedom are coupled via a dynamic uniaxial anisotropy term. We show that this model conserves total angular momentum, whereas spin and lattice angular momentum are not conserved. We carry out simulations of the Einstein-de Haas effect for a Fe nanocluster with more than 500 atoms that is free to rotate, using a modified version of the opensource spin-lattice dynamics code (SPILADY). We show that the rate of angular momentum transfer between spin and lattice is proportional to the strength of the magnetic anisotropy interaction. The addition of the anisotropy allows full spin-lattice relaxation to be achieved on previously reported timescales of similar to 100 ps and for tight-binding magnetic anisotropy energies comparable to those of small Fe nanoclusters.

Key words

Spin-lattice dynamics/Molecular dynamics simulations/Magnetic anisotropy/Conservation of total angular momentum/Angular momentum exchange/Einstein-de Haas effect

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出版年

2022
Computational Materials Science

Computational Materials Science

EISCI
ISSN：0927-0256
被引量5
参考文献量46
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