Modeling coupled spin and lattice dynamics
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 coupling term based upon 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.
Keywords
Cite
@article{arxiv.2010.00642,
title = {Modeling coupled spin and lattice dynamics},
author = {Mara Strungaru and Matthew O A Ellis and Sergiu Ruta and Oksana Chubykalo-Fesenko and Richard F L Evans and Roy W Chantrell},
journal= {arXiv preprint arXiv:2010.00642},
year = {2021}
}
Comments
12 pages, 9 figures