Current-perpendicular-to-plane spin valves with a Co2Mn (Ga 0.5Sn0.5) Heusler alloy

N. Hase, B. S.D.Ch S. Varaprasad, T. M. Nakatani, H. Sukegawa, S. Kasai, Y. K. Takahashi, T. Furubayashi, K. Hono

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18 Citations (Scopus)

Abstract

Current-perpendicular-to-plane spin valves (SVs) with a new Heusler alloy of Co2 Mn (Ga0.5Sn0.5) (CMGS) as magnetic layers and an Ag spacer have been investigated. Magnetoresistance (MR) values of 8.8% and 17.2% and resistance change-area product (ΔRA) of 4.0 m μ m2 and 6.5 m μ m2 were measured at 300 K and 12 K, respectively. Transmission electron microscopy observations have revealed that the CMGS magnetic layer was ordered to the B2 structure for the SV annealed at 400 °C. Higher annealing temperature led to the degradation of the multilayer structure, resulting in lower MR and ΔRA values regardless of the L 21 structure of the CMGS layer. This suggests that MR properties may be enhanced further if the thermal stability of the multilayer structure is improved.

Original languageEnglish
Article number093916
JournalJournal of Applied Physics
Volume108
Issue number9
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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