Spin-lattice dynamics model with angular momentum transfer for canonical and microcanonical ensembles
Autor: | M. Strungaru, Richard F. L. Evans, Sergiu Ruta, Matthew O. A. Ellis, Oksana Chubykalo-Fesenko, Roy W. Chantrell |
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Rok vydání: | 2021 |
Předmět: |
Physics
Angular momentum Spins Phonon Magnon Spectral density 02 engineering and technology Unified Model 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Spectral line Quantum mechanics Lattice (order) 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
Zdroj: | Physical Review B. 103 |
ISSN: | 2469-9969 2469-9950 |
Popis: | 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. |
Databáze: | OpenAIRE |
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