Structural and magnetic properties of epitaxial thin films of the equiatomic quaternary CoFeMnSi Heusler alloy

Lakhan Bainsla, Resul Yilgin, Jun Okabayashi, Atsuo Ono, Kazuya Suzuki, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We report the structural and magnetic properties of CoFeMnSi equiatomic quaternary Heusler alloy thin films. The epitaxial growth of the single-crystalline films with full B2 and partial L21 ordering on the Cr-buffered MgO(001) substrate was achieved using the in situ postannealing at temperature (Ta) of 500-600°C. A saturation magnetization value of about 3.5μB/f.u. (where f.u. represents formula unit) was obtained at room temperature for the sample with Ta=600°C, which is very close to the value of 3.7μB/f.u. reported previously for a bulk sample. Ferromagnetic resonance unveiled that negligible extrinsic relaxation due to magnetic softness as well as small intrinsic spin relaxation, i.e., the Gilbert damping constant of 0.005, which is smaller than that of permalloy. The spin magnetic moments for Co, Fe, and Mn atoms for the sample with Ta=600°C deduced from the x-ray magnetic circular dichroism were in agreement with those previously reported in the bulk sample, the effects of Fe-Mn swapping and Mn antisite disorder were discussed.

Original languageEnglish
Article number094404
JournalPhysical Review B
Volume96
Issue number9
DOIs
Publication statusPublished - 2017 Sep 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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