Theoretical investigation on the relationship between the torque correlation and spin correlation models for the Gilbert damping constant

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

To gain insight into the relationship between the spin correlation (SC) and torque correlation (TC) models for the Gilbert damping constant, α, we first make a simple consideration on the physical aspect of these models and calculate α for the Fe50Co50 disordered alloy by the two models using the first principles technique. Electron scattering is introduced through the random arrangement of atoms and is treated with coherent potential approximation. The results indicate that in the TC model, vertex correction (VC) does not have significant contribution and the results are insensitive to the infinitesimal positive value, δ, which is used in Green's function. In the SC model, on the other hand, the VC is indispensable and the obtained values of α are found to be considerably sensitive to δ. We confirm that the value of α in the SC model approaches the value obtained in the TC model in the limit δ→+0.

Original languageEnglish
Article number013912
JournalJournal of Applied Physics
Volume117
Issue number1
DOIs
Publication statusPublished - 2015 Jan 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Theoretical investigation on the relationship between the torque correlation and spin correlation models for the Gilbert damping constant'. Together they form a unique fingerprint.

  • Cite this