First-principles calculations of magnetization relaxation in pure Fe, Co, and Ni with frozen thermal lattice disorder

Abstract

The effect of the electron-phonon interaction on magnetization relaxation is studied within the framework of first-principles scattering theory for Fe, Co, and Ni by displacing atoms in the scattering region randomly with a thermal distribution. This "frozen thermal lattice disorder" approach reproduces the non-monotonic damping behaviour observed in ferromagnetic resonance measurements and yields reasonable quantitative agreement between calculated and experimental values. It can be readily applied to alloys and easily extended by determining the atomic displacements from ab initio phonon spectra.

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• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• A unified first-principles study of Gilbert damping, spin-flip diffusion and resistivity in transition metal alloys
• Low relaxation rate in a low-Z alloy of iron
• Spin orbit precession damping in transition metal ferromagnets

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