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.

arXiv comment12 pages, 9 figures

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Cited by in corpus (12)

• Quantum Brownian Motion for Magnets
• Spin-lattice model for cubic crystals
• Angular momentum transfer via relativistic spin-lattice coupling from first principles
• Internal decoherence in nano-object interferometry due to phonons
• Ultrafast Demagnetization through Femtosecond Generation of Non-thermal Magnons
• Rotationally invariant formulation of spin-lattice coupling in multi-scale modeling
• Spin-lattice interaction parameters from first principles: theory and implementation
• Energy balance and energy correction in dynamics of classical spin systems
• Calculating spin-lattice interactions in ferro- and antiferromagnets: the role of symmetry, dimension and frustration
• A feasibility analysis towards the simulation of hysteresis with spin-lattice dynamics
• Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry
• Spin-lattice couplings in $3d$ ferromagnets: analysis from first-principles