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

被引：168

作者：

Ebert, H. ^{[1
]}

Mankovsky, S. ^{[1
]}

Koedderitzsch, D. ^{[1
]}

Kelly, P. J. ^{[2
,3
]}

机构：

[1] Univ Munich, Dept Chem, D-81377 Munich, Germany

[2] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[3] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 06期

关键词：

COHERENT-POTENTIAL APPROXIMATION; IMPURITIES; ALLOYS; METALS;

D O I：

10.1103/PhysRevLett.107.066603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A Kubo-Greenwood-like equation for the Gilbert damping parameter alpha 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 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 alpha when small amounts of substitutional Cu are introduced.

引用

页数：4

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