Magnetization dynamics in the inertial regime: nutation predicted at short time scales

2010/08/12 by M. -C. Ciornei, J. M. Rubí, J. -E. Wegrowe · 4 citations
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.83.020410

arxiv created 2010/08/12 · arxiv updated 2015/05/19

Abstract

The dynamical equation of the magnetization has been reconsidered with enlarging the phase space of the ferromagnetic degrees of freedom to the angular momentum. The generalized Landau-Lifshitz-Gilbert equation that includes inertial terms, and the corresponding Fokker-Planck equation, are then derived in the framework of mesoscopic non-equilibrium thermodynamics theory. A typical relaxation time τ is introduced describing the relaxation of the magnetization acceleration from the inertial regime towards the precession regime defined by a constant Larmor frequency. For time scales larger than τ, the usual Gilbert equation is recovered. For time scales below τ, nutation and related inertial effects are predicted. The inertial regime offers new opportunities for the implementation of ultrafast magnetization switching in magnetic devices.

Cited by

• Relativistic theory for coupled orbital and spin angular momentum dynamics in magnetic systems
• Ultrafast switching of antiferromagnetic order by field-derivative torque
• Bringing light into the Landau-Lifshitz-Gilbert equation: Consequences of its fractal non-Markovian memory kernel for optically induced magnetic inertia and magnons
• Unquenched orbital angular momentum as the origin of spin inertia

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