The effect of substitution of Fe with Cr on the giant magnetoresistance of current-perpendicular-to-plane spin valves with Co2FeSi Heusler alloy

H. S. Goripati, T. Furubayashi, S. V. Karthik, T. M. Nakatani, Y. K. Takahashi, K. Hono*

*この研究の対応する著者

研究成果査読

11 被引用数 (Scopus)

抄録

We fabricated current-perpendicular-to-plane spin valves (SV) using Co 2FeSi and Co2(Cr0.1Fe0.9)Si Heusler alloys as ferromagnetic layers and a Ag spacer. The SV with Co 2(Cr0.1Fe0.9)Si showed relatively large magnetoresistance (MR) ratio of 11.9 and the resistance change-area product (δRA) of 6.3 mω μm2 at room temperature as compared to the MR ratio of 9.4 and the RA value of 4.1 mω μm2 for the SV using Co2FeSi. This indicates that the spin polarization of Co2FeSi is enhanced by the substitution of Cr for Fe as suggested by a previous point contact Andreev reflection measurements. Considering the high Curie temperature of 993 K, the Co2(Cr0.1Fe 0.9)Si alloy could be promising material for spin polarized electron source.

本文言語English
論文番号043901
ジャーナルJournal of Applied Physics
109
4
DOI
出版ステータスPublished - 2011 2 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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