Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula
Materials Science
2010-04-28 v1
Abstract
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.
Keywords
Cite
@article{arxiv.0808.3923,
title = {Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula},
author = {Ion Garate and Allan MacDonald},
journal= {arXiv preprint arXiv:0808.3923},
year = {2010}
}
Comments
10 pages, 10 figures. Submitted to Phys. Rev. B