Spin-lattice dynamics model with angular momentum transfer for canonical and microcanonical ensembles

Abstract

A unified model of molecular and atomistic spin dynamics is presented enabling simulations both in microcanonical and canonical ensembles without the necessity of additional phenomenological spin damping. Transfer of energy and angular momentum between the lattice and the spin systems is achieved by a phenomenological coupling term representing the spin-orbit interaction. The characteristic spectra of the spin and phonon systems are analyzed for different coupling strength and temperatures. The spin spectral density shows magnon modes together with the uncorrelated noise induced by the coupling to the lattice. The effective damping parameter is investigated showing an increase with both coupling strength and temperature. The model paves the way to understanding magnetic relaxation processes beyond the phenomenological approach of the Gilbert damping and the dynamics of the energy transfer between lattice and spins.

Metadata

Item Type:	Article
Authors/Creators:	Strungaru, Mara (mss555@york.ac.uk) Ellis, Matthew O.A. Ruta, Sergiu (sir503@york.ac.uk) Chubykalo-Fesenko, Oksana Evans, Richard F.L. https://orcid.org/0000-0002-2378-8203 Chantrell, Roy W. https://orcid.org/0000-0001-5410-5615
Copyright, Publisher and Additional Information:	Funding Information: We are grateful to Dr. P.-W. Ma and Professor M. Probert for helpful discussions. Financial support of the Advanced Storage Research Consortium is gratefully acknowledged. M.O.A.E. gratefully acknowledges support in part from EPSRC through Grant No. EP/S009647/1. The spin-lattice simulations were undertaken on the VIKING cluster, which is a high performance compute facility provided by the University of York. The authors acknowledge the networking opportunities provided by the European COST Action CA17123 "Magnetofon" and the short-time scientific mission awarded to M.S. © 2021 American Physical Society. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details
Dates:	Accepted: 22 December 2020 Published: 19 January 2021
Institution:	The University of York
Academic Units:	The University of York > York Institute for Materials Research The University of York > Faculty of Sciences (York) > Physics (York)
Depositing User:	Pure (York)
Date Deposited:	19 Mar 2021 09:50
Last Modified:	09 Apr 2025 23:30
Published Version:	https://doi.org/10.1103/PhysRevB.103.024429
Status:	Published
Refereed:	Yes
Identification Number:	10.1103/PhysRevB.103.024429
Related URLs:	http://www.scopus.com/inward/record.url?...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:172323

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Spin-lattice dynamics model with angular momentum transfer for canonical and microcanonical ensembles

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