Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2 Fe (Ge0.5 Ga0.5) Heusler alloy

Y. K. Takahashi, A. Srinivasan, B. Varaprasad, A. Rajanikanth, N. Hase, T. M. Nakatani, S. Kasai, T. Furubayashi, K. Hono

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Abstract

Using a newly developed highly spin-polarized Heusler alloy, Co2 Fe (Ga0.5 Ge0.5) (CFGG), as ferromagnetic layers, we have fabricated a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (ΔRA) of 9.5 m μ m 2 and magnetoresistance (MR) ratio (100×ΔR/R) of 41.7% at 300 K. These values were further enhanced to Δ R A=26.4 m μ m 2 and MR=129.1% at 10 K. The large MR values are attributed to the high spin polarization of the CFGG alloy confirmed by point contact Andreev reflection measurements.

Original languageEnglish
Article number152501
JournalApplied Physics Letters
Volume98
Issue number15
DOIs
Publication statusPublished - 2011 Apr 11
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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