Magnetization Dynamics, Gyromagnetic Relation, and Inertial Effects

Details Magnetization Dynamics, Gyromagnetic Relation, and Inertial Effects Magnetization Dynamics, Gyromagnetic Relation, and Inertial Effects

2011-09-30

arxiv.org/abs/1109.6782v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 1 figure

Scientific paper

The gyromagnetic relation - i.e. the proportionality between the angular momentum $\vec L$ (defined by an inertial tensor) and the magnetization $\vec M$ - is evidence of the intimate connections between the magnetic properties and the inertial properties of ferromagnetic bodies. However, inertia is absent from the dynamics of a magnetic dipole (the Landau-Lifshitz equation, the Gilbert equation and the Bloch equation contain only the first derivative of the magnetization with respect to time). In order to investigate this paradoxical situation, the lagrangian approach (proposed originally by T. H. Gilbert) is revisited keeping an arbitrary nonzero inertial tensor. A dynamic equation generalized to the inertial regime is obtained. It is shown how both the usual gyromagnetic relation and the well-known Landau-Lifshitz-Gilbert equation are recovered at the kinetic limit, i.e. for time scales above the relaxation time $\tau$ of the angular momentum.

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