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Ab Initio Calculation of the Gilbert Damping Parameter via the Linear Response Formalism

Ab Initio Calculation of the Gilbert Damping Parameter via the Linear Response Formalism A Kubo-Greenwood-like equation for the Gilbert damping parameter α is presented that is based on the linear response formalism. Its implementation using the fully relativistic Korringa-Kohn-Rostoker band structure method in combination with coherent potential approximation alloy theory allows it to be applied to a wide range of situations. This is demonstrated with results obtained for the bcc alloy system Fe 1 - x Co x as well as for a series of alloys of Permalloy with 5 d 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 α when small amounts of substitutional Cu are introduced. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Ab Initio Calculation of the Gilbert Damping Parameter via the Linear Response Formalism

Physical Review Letters , Volume 107 (6) – Aug 5, 2011
4 pages

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References (39)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
0031-9007
eISSN
1079-7114
DOI
10.1103/PhysRevLett.107.066603
pmid
21902352
Publisher site
See Article on Publisher Site

Abstract

A Kubo-Greenwood-like equation for the Gilbert damping parameter α is presented that is based on the linear response formalism. Its implementation using the fully relativistic Korringa-Kohn-Rostoker band structure method in combination with coherent potential approximation alloy theory allows it to be applied to a wide range of situations. This is demonstrated with results obtained for the bcc alloy system Fe 1 - x Co x as well as for a series of alloys of Permalloy with 5 d 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 α when small amounts of substitutional Cu are introduced.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Aug 5, 2011

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