Inhomogeneous Gilbert damping from impurities and electron-electron interactions
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We present a unified theory of magnetic damping in itinerant electron ferromagnets at order q2 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.
Phys. Rev. B 78, 020404(R) (2008) [4 pages]