Increased magnetic damping in ultrathin films of Co2FeAl with perpendicular anisotropy

Y. K. Takahashi, Y. Miura, R. Choi, T. Ohkubo, Z. C. Wen, K. Ishioka, R. Mandal, R. Medapalli, H. Sukegawa, S. Mitani, E. E. Fullerton, K. Hono

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We estimated the magnetic damping constant α of Co2FeAl (CFA) Heusler alloy films of different thicknesses with an MgO capping layer by means of time-resolved magneto-optical Kerr effect and ferromagnetic resonance measurements. CFA films with thicknesses of 1.2 nm and below exhibited perpendicular magnetic anisotropy arising from the presence of the interface with MgO. While α increased gradually with decreasing CFA film thickness down to 1.2 nm, it was increased substantially when the thickness was reduced further to 1.0 nm. Based on the microstructure analyses and first-principles calculations, we attributed the origin of the large α in the ultrathin CFA film primarily to the Al deficiency in the CFA layer, which caused an increase in the density of states and thereby in the scatterings of their spins.

本文言語English
論文番号252409
ジャーナルApplied Physics Letters
110
25
DOI
出版ステータスPublished - 2017 6 19
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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