Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2 Fe (Ge0.5 Ga0.5) Heusler alloy

Y. K. Takahashi; A. Srinivasan; B. Varaprasad; A. Rajanikanth; N. Hase; T. M. Nakatani; S. Kasai; T. Furubayashi; K. Hono

doi:10.1063/1.3576923

Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co₂ Fe (Ge_0.5 Ga_0.5) Heusler alloy

Y. K. Takahashi, A. Srinivasan, B. Varaprasad, A. Rajanikanth, N. Hase, T. M. Nakatani, S. Kasai, T. Furubayashi, K. Hono

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96 Citations (Scopus)

Abstract

Using a newly developed highly spin-polarized Heusler alloy, Co₂ Fe (Ga_0.5 Ge_0.5) (CFGG), as ferromagnetic layers, we have fabricated a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (Δ_RA) of 9.5 m μ m ² and magnetoresistance (MR) ratio (100×ΔR/R) of 41.7% at 300 K. These values were further enhanced to Δ R A=26.4 m μ m ² and MR=129.1% at 10 K. The large MR values are attributed to the high spin polarization of the CFGG alloy confirmed by point contact Andreev reflection measurements.

Original language	English
Article number	152501
Journal	Applied Physics Letters
Volume	98
Issue number	15
DOIs	https://doi.org/10.1063/1.3576923
Publication status	Published - 2011 Apr 11
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3576923

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@article{014d1a792f6e49a290e771399904fafa,

title = "Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2 Fe (Ge0.5 Ga0.5) Heusler alloy",

abstract = "Using a newly developed highly spin-polarized Heusler alloy, Co2 Fe (Ga0.5 Ge0.5) (CFGG), as ferromagnetic layers, we have fabricated a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (ΔRA) of 9.5 m μ m 2 and magnetoresistance (MR) ratio (100×ΔR/R) of 41.7% at 300 K. These values were further enhanced to Δ R A=26.4 m μ m 2 and MR=129.1% at 10 K. The large MR values are attributed to the high spin polarization of the CFGG alloy confirmed by point contact Andreev reflection measurements.",

author = "Takahashi, {Y. K.} and A. Srinivasan and B. Varaprasad and A. Rajanikanth and N. Hase and Nakatani, {T. M.} and S. Kasai and T. Furubayashi and K. Hono",

note = "Funding Information: This work was supported in part by PREST-JST and by Grant-in-Aids for Scientific Research (A) and (B) (Grant Nos. 22246091 and 20360322).",

year = "2011",

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day = "11",

doi = "10.1063/1.3576923",

language = "English",

volume = "98",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "15",

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TY - JOUR

T1 - Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2 Fe (Ge0.5 Ga0.5) Heusler alloy

AU - Takahashi, Y. K.

AU - Srinivasan, A.

AU - Varaprasad, B.

AU - Rajanikanth, A.

AU - Hase, N.

AU - Nakatani, T. M.

AU - Kasai, S.

AU - Furubayashi, T.

AU - Hono, K.

N1 - Funding Information: This work was supported in part by PREST-JST and by Grant-in-Aids for Scientific Research (A) and (B) (Grant Nos. 22246091 and 20360322).

PY - 2011/4/11

Y1 - 2011/4/11

N2 - Using a newly developed highly spin-polarized Heusler alloy, Co2 Fe (Ga0.5 Ge0.5) (CFGG), as ferromagnetic layers, we have fabricated a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (ΔRA) of 9.5 m μ m 2 and magnetoresistance (MR) ratio (100×ΔR/R) of 41.7% at 300 K. These values were further enhanced to Δ R A=26.4 m μ m 2 and MR=129.1% at 10 K. The large MR values are attributed to the high spin polarization of the CFGG alloy confirmed by point contact Andreev reflection measurements.

AB - Using a newly developed highly spin-polarized Heusler alloy, Co2 Fe (Ga0.5 Ge0.5) (CFGG), as ferromagnetic layers, we have fabricated a current-perpendicular-to-plane pseudospin valve with large resistance change-area product (ΔRA) of 9.5 m μ m 2 and magnetoresistance (MR) ratio (100×ΔR/R) of 41.7% at 300 K. These values were further enhanced to Δ R A=26.4 m μ m 2 and MR=129.1% at 10 K. The large MR values are attributed to the high spin polarization of the CFGG alloy confirmed by point contact Andreev reflection measurements.

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ER -

Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co₂ Fe (Ge_0.5 Ga_0.5) Heusler alloy

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