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

doi:10.1063/1.3503869

Current-perpendicular-to-plane spin valves with a Co₂Mn (Ga _0.5Sn_0.5) Heusler alloy

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Current-perpendicular-to-plane spin valves (SVs) with a new Heusler alloy of Co₂ Mn (Ga_0.5Sn_0.5) (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 language	English
Article number	093916
Journal	Journal of Applied Physics
Volume	108
Issue number	9
DOIs	https://doi.org/10.1063/1.3503869
Publication status	Published - 2010 Nov 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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

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.",

author = "N. Hase and Varaprasad, {B. S.D.Ch S.} and Nakatani, {T. M.} and H. Sukegawa and S. Kasai and Takahashi, {Y. K.} and T. Furubayashi and K. Hono",

note = "Funding Information: The authors thank Dr. S. Mitani and Dr. M. Hayashi for the valuable discussion and advice. NH, BSDCSV and TMN thank the National Institute for Materials Science for providing a NIMS junior research assistantship. This work was in part supported by the Grant-in-Aid for Scientific Research (A) (Grant No. 2224609) and (B) (Grant No. 20360322) and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.",

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doi = "10.1063/1.3503869",

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T1 - Current-perpendicular-to-plane spin valves with a Co2Mn (Ga 0.5Sn0.5) Heusler alloy

AU - Hase, N.

AU - Varaprasad, B. S.D.Ch S.

AU - Nakatani, T. M.

AU - Sukegawa, H.

AU - Kasai, S.

AU - Takahashi, Y. K.

AU - Furubayashi, T.

AU - Hono, K.

N1 - Funding Information: The authors thank Dr. S. Mitani and Dr. M. Hayashi for the valuable discussion and advice. NH, BSDCSV and TMN thank the National Institute for Materials Science for providing a NIMS junior research assistantship. This work was in part supported by the Grant-in-Aid for Scientific Research (A) (Grant No. 2224609) and (B) (Grant No. 20360322) and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - 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.

AB - 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.

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Current-perpendicular-to-plane spin valves with a Co₂Mn (Ga _0.5Sn_0.5) Heusler alloy

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