Effect of Film Thickness on the High Frequency Magnetic Properties of Polycrystalline Fe-Ga Films

Yasushi Endo, Takumi Sakai, Takamichi Miyazaki, Yutaka Shimada

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This paper describes the effect of film thickness on the high frequency magnetic properties of polycrystalline Fe-Ga films. The damping constant (α) increases markedly from approximately 0.015 to 0.081 for a film thickness below 20 nm, reaches a maximum value of 0.084 at a thickness of 30 nm, and then decreases to 0.068 as the thickness further increases to 100 nm. All the values are much larger than those of a single crystal Fe-Ga film, indicating that the extrinsic damping overlaps with the intrinsic damping. The inhomogeneous broadening in a zero field [ΔH (0)] significantly increases with the film thickness due to the magnetic inhomogeneities, such as anisotropy dispersion and other effects. In addition, α increases markedly as the saturation magnetostriction (λs) increases. This behavior is very similar to those of Ni-Fe and Ni-Fe-M films. Therefore, these results demonstrate that α is correlated with λs regardless of the film thickness, and also sensitive to magnetic inhomogeneities.

Original languageEnglish
Article number7924417
JournalIEEE Transactions on Magnetics
Volume53
Issue number11
DOIs
Publication statusPublished - 2017 Nov

Keywords

  • Coplanar waveguide ferromagnetic resonance (CPW-FMR) measurement
  • Fe-Ga film
  • damping constant
  • saturation magnetostriction

ASJC Scopus subject areas

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

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