Magnetic damping in ferromagnetic thin films

Mikihiko Oogane, Takeshi Wakitani, Satoshi Yakata, Resul Yilgin, Yasuo Ando, Akimasa Sakuma, Terunobu Miyazaki

Research output: Contribution to journalArticle

136 Citations (Scopus)

Abstract

We determined the Gilbert damping constants of Fe-Co-. Ni and Co-Fe-B alloys with various compositions and half-metallic Co2MnAl Heusler alloy films prepared by magnetron sputtering. The ferromagnetic resonance (FMR) technique was used to determine the damping constants of the prepared films. The 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 experimental results fitted well, considering the inhomogeneities of the films in the fitting. The damping constants of the metallic films were much larger than those of bulk ferrimagnetic insulators and were roughly proportional to (g - 2)2, where g is the Lande g factor. We discuss the origin of magnetic damping, considering spin-orbit and s-d interactions.

Original languageEnglish
Pages (from-to)3889-3891
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number5 A
DOIs
Publication statusPublished - 2006 May 9

Keywords

  • Ferromagnetic resonance
  • MRAM
  • Magnetic damping
  • Spin dynamics

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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