Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula

Details Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula

2008-08-28

arxiv.org/abs/0808.3923v1

Phys. Rev. B 79, 064404 (2009)

Physics

Condensed Matter

Materials Science

10 pages, 10 figures. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.064404

We report on a study of Gilbert damping due to particle-hole pair excitations in conducting ferromagnets. We focus on a toy two-band model and on a four-band spherical model which provides an approximate description of ferromagnetic (Ga,Mn)As. These models are sufficiently simple that disorder-ladder-sum vertex corrections to the long-wavelength spin-spin response function can be summed to all orders. An important objective of this study is to assess the reliability of practical approximate expressions which can be combined with electronic structure calculations to estimate Gilbert damping in more complex systems.

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