Current-perpendicular-to-plane giant magnetoresistance in pseudo spin valves with Co2Fe(Ge0.5Ga0.5) heusler alloy ferromagnetic layers and Cu/Ag spacer

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We studied the transport properties and micro-structure of current-perpendicular-to-plane pseudo spin valves (PSVs) with ferromagnetic Co2Fe}(Ge0.5Ga0.5) (CFGG) Heusler alloy layers and a Cu or Ag spacer. The CFGG/Cu/CFGG PSVs showed an optimum annealing temperature at 300°C, which is substantially lower than 500°C for CFGG/Ag/CFGG PSVs. The Valet-Fert analysis yielded comparable interfacial spin asymmetries in CFGG/Cu (or Ag)/CFGG PSVs, which indicates that the Cu spacer has as good a band matching as that of the Ag spacer with the CFGG Heusler alloy. However, transmission electron microscopy observation revealed that the CFGG/Cu/CFGG tri-layered structure is thermally unstable compared to the CFGG/Ag/CFGG tri-layered structure, thus placing a limit on the annealing temperature for producing higher magnetoresistance output by using the Cu spacer.

Original languageEnglish
Article number6558963
Pages (from-to)4413-4416
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • CPP-GMR
  • Heusler alloy
  • magnetic read head

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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