title: Temperature for a dynamic spin ensemble.
abstract: In molecular dynamics simulations, temperature is evaluated, via the equipartition principle, by computing the mean kinetic energy of atoms. There is no similar recipe yet for evaluating temperature of a dynamic system of interacting spins. By solving semiclassical Langevin spin-dynamics equations, and applying the fluctuation-dissipation theorem, we derive an equation for the temperature of a spin ensemble, expressed in terms of dynamic spin variables. The fact that definitions for the kinetic and spin temperatures are fully consistent is illustrated using large-scale spin dynamics and spin-lattice dynamics simulations.
authors.affiliation: Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China.
authors.forename: Pui-Wai
authors.initials: PW
authors.lastname: Ma
authors.forename: S L
authors.initials: SL
authors.lastname: Dudarev
authors.forename: A A
authors.initials: AA
authors.lastname: Semenov
authors.forename: C H
authors.initials: CH
authors.lastname: Woo