Transient spin dynamics in a single-molecule magnet

Abstract

We explore the limitations and validity of semi-classically formulated spin equations of motion. Using a single-molecule magnet as a test model, we employ three qualitatively different approximation schemes. From a microscopic model, we derive a generalized spin equation of motion in which the parameters have a non-local time-dependence. This dynamical equation is simplified to the Landau-Lifshitz-Gilbert equation with i) time-dependent, and ii) time-independent parameters. We show that transient dynamics is essentially non-existing in the latter approximation, while the former breaks down in the regime of strong coupling between the spin and the itinerant electrons.

8 pages, 5 figures

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Cited by in corpus (14)

• Time-retarded damping and magnetic inertia in the Landau-Lifshitz-Gilbert equation self-consistently coupled to electronic time-dependent nonequilibrium Green functions
• A many-body approach to transport in quantum systems: From the transient regime to the stationary state
• Inertial effects in ultrafast spin dynamics
• Spin-dependent heat signatures of single-molecule spin dynamics
• Charge Transport and Entropy Production Rate in Magnetically Active Molecular Dimer
• Bath-induced spin inertia
• Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems
• Unified framework of the microscopic Landau-Lifshitz-Gilbert equation and its application to Skyrmion dynamics
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Dynamical exchange and phase induced switching of a localized molecular spin
• Electronically Mediated Magnetic Anisotropy in Vibrating Magnetic Molecules
• Charge conservation in spin torque oscillators leads to a self-induced torque
• Time-dependent spintronic anisotropy in magnetic molecules
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque