Structure and magnetoresistance of current-perpendicular-to-plane pseudo spin valves using Co2Mn(Ga0.25Ge0.75) Heusler alloy

Y. K. Takahashi, N. Hase, M. Kodzuka, A. Itoh, T. Koganezawa, T. Furubayashi, S. Li, B. S.D.Ch S. Varaprasad, T. Ohkubo, K. Hono

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32 Citations (Scopus)

Abstract

We have investigated the structure and magnetoresistance of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) pseudo spin valves (PSVs) using Co2Mn(Ga0.25Ge0.75) (CMGG) Heusler alloy ferromagnetic layers annealed at different temperatures. Relatively large ΔRA of 6.1 mΩμm2 and MR ratio of 40.2% were obtained in the CPP-PSV annealed at 400 °C. Annealing at higher than 400 °C led to a significant deterioration of MR outputs. Detailed structure analysis using transmission electron microscopy, three-dimensional atom probe, and synchrotron x-ray diffraction showed that the degradation of MR in the over-annealed sample was due to the increase of DO3 disorder in the CMGG layer, while the layered structure of the film is fully preserved.

Original languageEnglish
Article number223901
JournalJournal of Applied Physics
Volume113
Issue number22
DOIs
Publication statusPublished - 2013 Jun 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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