Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys

S. V. Karthik*, A. Rajanikanth, T. M. Nakatani, Z. Gercsi, Y. K. Takahashi, T. Furubayashi, K. Inomata, K. Hono

*この研究の対応する著者

研究成果: Article査読

29 被引用数 (Scopus)

抄録

We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2 Crx Fe1-x Si alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L 21 ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0x0.5. We propose the composition range of 0.02x0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance.

本文言語English
論文番号043903
ジャーナルJournal of Applied Physics
102
4
DOI
出版ステータスPublished - 2007
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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