Ab-initio calculation of the Gilbert damping parameter via linear response formalism
Materials Science
2015-05-27 v1 Other Condensed Matter
Abstract
A Kubo-Greenwood-like equation for the Gilbert damping parameter is presented that is based on the linear response formalism. Its implementation using the fully relativistic Korringa-Kohn-Rostoker (KKR) band structure method in combination with Coherent Potential Approximation (CPA) alloy theory allows it to be applied to a wide range of situations. This is demonstrated with results obtained for the bcc alloy system FeCo as well as for a series of alloys of permalloy with 5d transition metals. To account for the thermal displacements of atoms as a scattering mechanism, an alloy-analogy model is introduced. The corresponding calculations for Ni correctly describe the rapid change of when small amounts of substitutional Cu are introduced.
Keywords
Cite
@article{arxiv.1102.4551,
title = {Ab-initio calculation of the Gilbert damping parameter via linear response formalism},
author = {H. Ebert and S. Mankovsky and D. Koedderitzsch and P. J. Kelly},
journal= {arXiv preprint arXiv:1102.4551},
year = {2015}
}