Current-perpendicular-to-plane giant magnetoresistance using Co 2Fe(Ga1-xGex) Heusler alloy

H. S. Goripati*, T. Furubayashi, Y. K. Takahashi, K. Hono

*この研究の対応する著者

研究成果: Article査読

36 被引用数 (Scopus)

抄録

We investigated the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo spin valves (PSVs) using ferromagnetic (FM) Heusler alloy Co2Fe(Ga1-xGex) (x = 0, 0.5, and 1) layers and an Ag spacer layer. The FM layer with x = 0.5 gave rise to the highest MR output, ΔRA = 8.7 mΩ·μm2, at room temperature with 10 nm thick Heusler alloy layers. The MR output increased with increasing annealing temperature, Ta, with a maximum at Ta = 500 °C. Transmission electron microscopy showed no visible changes in the layered structure; however, energy dispersive x-ray analysis indicated a considerable diffusion of Ga and Ge into the other layers by annealing at T a = 550 °C. The ΔRA dependence on the thickness of the FM layers indicated that both high bulk and interface spin asymmetries contribute to the high MR output.

本文言語English
論文番号043901
ジャーナルJournal of Applied Physics
113
4
DOI
出版ステータスPublished - 2013 1 28
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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