Intrinsic Gilbert damping constant in Co2MnAl Heusler alloy films

Resul Yilgin, Mikihiko Oogane, Stoshi Yakata, Yasuo Ando, Terunobu Miyazaki

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Intrinsic α-damping constants of Co2MnAl Heusler alloy films prepared by magnetron sputtering were investigated. After deposition of Co2MnAl films, the films were annealed at 200-400°C to control the crystal structure and the atomic order between Co, Mn, and Al sites. Ferromagnetic resonance (FMR) technique was used to obtain α values of Co2MnAl films in this study. Out-of-plane angular dependences of the resonance field (HR) and line width (ΔHpp) of FMR spectra were measured and fitted using the Landau-Lifshitz-Gilbert (LLG) equation. The authors were able to fit all experimental results well because of the lack of inhomogeneities in prepared Co2MnAl films. The α-damping constants obtained from the fitting results decreased with increasing annealing temperature and showed a minimum value of 0.007 at 300°C. It was found that a degree of B2 structure order can sensitively affect α-damping constants of Co2MnAl films.

Original languageEnglish
Pages (from-to)2799-2801
Number of pages3
JournalIEEE Transactions on Magnetics
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct 1

Keywords

  • Ferromagnetic resonance (FMR)
  • Heusler alloy
  • Linewidth
  • Resonance field
  • α-Gilbert damping constant

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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