Theoretical study on gilbert damping of nonuniform magnetization precession in ferromagnetic metals

Nobuyuki Umetsu, Daisuke Miura, Akimasa Sakuma

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We study Gilbert damping in bulk metallic ferromagnets containing magnetic and nonmagnetic impurities in the presence of nonuniform magnetization precession. In this model, a microscopic expression for the Gilbert damping tensor is obtained using the linear response theory with respect to the interaction between magnetization and conduction electrons. We especially focus on a diagonal element of the tensor, which is a conventional Gilbert damping constant, and evaluate it numerically as a function of the wave vector q of magnetization precession. We show that the impurity scattering dominates Gilbert damping for 0 < |q| < k F↔ - k F↓, while the Stoner excitation dominates for k F↔ - k F↓ < |q| < k F↔ + k F↓ (k is the Fermi wave number for σ spin electrons).

Original languageEnglish
Article number114716
Journaljournal of the physical society of japan
Volume81
Issue number11
DOIs
Publication statusPublished - 2012 Nov

Keywords

  • Gilbert damping
  • Landau-Lifshitz-Gilbert equation
  • Spintronics
  • Transverse spin susceptibility

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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