Ab Initio theory of the Gilbert damping in random ferromagnetic alloys

0482219 - FZÚ 2018 RIV US eng J - Journal Article
Drchal, Václav - Turek, I. - Kudrnovský, Josef
Ab Initio theory of the Gilbert damping in random ferromagnetic alloys.
Journal of Superconductivity and Novel Magnetism. Roč. 30, č. 6 (2017), s. 1669-1672. ISSN 1557-1939. E-ISSN 1557-1947
R&D Projects: GA ČR GA15-13436S
Institutional support: RVO:68378271
Keywords : Gilbert damping * ferromagnetic alloys * ab initio * nonlocal torques
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.142, year: 2017

We present an ab initio theory of the Gilbert damping in ferromagnetic alloys with substitutional disorder. The theory is based on nonlocal torques represented by nonrandom, site-off-dagonal, and spin-independent matrices. The formalism is developed for the relativistic tight-binding linear muffin-tin orbital (TB-LMTO) method and the coherent potential approximation (CPA). The CPA vertex corrections play a crucial role for the internal consistency of the theory and for its exact equivalence to other first-principles approaches based on random local torques. The theory is illustrated by calculations for various random transition metal alloys. Results are in a reasonable agreement with other calculations and accessible experimental data.
Permanent Link: http://hdl.handle.net/11104/0277603