Structure and magnetoresistive properties of current-perpendicular-to-plane pseudo-spin valves using polycrystalline Co2fe-based heusler alloy films

T. M. Nakatani, Ye Du, Y. K. Takahashi, T. Furubayashi, K. Hono*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We report current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of pseudo-spin valves (PSVs) with polycrystalline Co2Fe(Al 0.5Si0.5) (CFAS) and Co2Fe(Ga 0.5Ge0.5) (CFGG) Heusler alloy films. Strongly [0 1 1] textured polycrystalline Heusler alloy films grew on the Ta/Ru/Ag underlayer. Relatively large CPP-GMR values of ΔRA up to 4 mΩ μm2 and ΔR/R up to 10% were obtained with 5 nm thick Heusler alloy films and Ag spacer layer by annealing CFAS PSV at 450 C and CFGG PSV at 350 C. Transmission electron microscopy revealed a flat and sharp interface between the [0 1 1] textured CFAS layers and the [1 1 1] textured Ag spacer layer. Annealing above an optimal temperature for each PSV led to reductions in MR values as a result of the thickening of the spacer layer induced by the Ag diffusion from the outer Ag layers.

Original languageEnglish
Pages (from-to)3695-3702
Number of pages8
JournalActa Materialia
Volume61
Issue number10
DOIs
Publication statusPublished - 2013 Jun
Externally publishedYes

Keywords

  • Giant magnetoresistance CPP-GMR Heusler alloy Spin valve

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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