Micromagnetic modelling of anisotropic damping in ferromagnet

Abstract

We report a numerical implementation of the Landau-Lifshitz-Baryakhtar theory, which dictates that the micromagnetic relaxation term obeys the symmetry of the magnetic crystal, i. e. replacing the single intrinsic damping constant with a tensor of corresponding symmetry. The effect of anisotropic relaxation is studied in thin saturated ferromagnetic disk and ellipse with and without uniaxial magneto-crystalline anisotropy. We investigate the angular dependency of the linewidth of magnonic resonances with respect to the given structure of the relaxation tensor. The simulations suggest that the anisotropy of the magnonic linewidth is determined by only two factors: the projection of the relaxation tensor onto the plane of precession and the ellipticity of the later.

6 pages, 5 figures, submitted to PRB Rapid. Comm

References in corpus (2)

• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• Mode- and size-dependent Landau-Lifshitz damping in magnetic nanostructures: Evidence for non-local damping

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