Co-based Heusler alloys for CPP-GMR spin-valves with large magnetoresistive outputs

T. M. Nakatani*, N. Hase, H. S. Goripati, Y. K. Takahashi, T. Furubayashi, K. Hono

*この研究の対応する著者

研究成果: Article査読

33 被引用数 (Scopus)

抄録

We studied various Heusler alloy compositions for the ferromagnetic layers of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valves (SVs) to obtain large MR outputs for the read sensor applications. The exchange biased SV with Co2 Fe(Al0.5 Si0.5 ) alloy showed a resistance change-area product (Δ RA) of 6 mΩ μm 2 and an MR ratio of 21% at room temperature when the Co2 Fe(Al0.5 Si0.5 ) layer was well-B2-ordered by a high temperature annealing at 500°C. The critical bias current density for the spin torque effect on the reduction of ΔRA was ∼ 3 × 10 7 A/cm2. Based on the high spin polarization directly measured by the point contact Andreev reflection method, Co2 (Cr 0.1 Fe0.9 )Si, Co2 Mn(Ga0.5 Sn 0.5 ), and Co2 Fe(Ge0.5 Ga0.5 ) alloy thin films were investigated for CPP-GMR SVs. Among them, the Co 2Fe(Ge0.5Ga0.5) alloy showed a high CPP-GMR ratio in the pseudo SVs exceeding 40% at RT and 120% at 10 K.

本文言語English
論文番号6187793
ページ(範囲)1751-1757
ページ数7
ジャーナルIEEE Transactions on Magnetics
48
5 PART 1
DOI
出版ステータスPublished - 2012 5月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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