Inhomogeneous Gilbert damping from impurities and electron-electron interactions

Details Inhomogeneous Gilbert damping from impurities and electron-electron interactions Inhomogeneous Gilbert damping from impurities and electron-electron interactions

2008-04-04

arxiv.org/abs/0804.0820v2

Phys. Rev. B 78, 020404 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.78.020404

We present a unified theory of magnetic damping in itinerant electron ferromagnets at order $q^2$ including electron-electron interactions and disorder scattering. We show that the Gilbert damping coefficient can be expressed in terms of the spin conductivity, leading to a Matthiessen-type formula in which disorder and interaction contributions are additive. In a weak ferromagnet regime, electron-electron interactions lead to a strong enhancement of the Gilbert damping.

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