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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number043901
JournalJournal of Applied Physics
Volume113
Issue number4
DOIs
Publication statusPublished - 2013 Jan 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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