The effect of substitution of Fe with Cr on the giant magnetoresistance of current-perpendicular-to-plane spin valves with Co2FeSi Heusler alloy

H. S. Goripati; T. Furubayashi; S. V. Karthik; T. M. Nakatani; Y. K. Takahashi; K. Hono

doi:10.1063/1.3549722

The effect of substitution of Fe with Cr on the giant magnetoresistance of current-perpendicular-to-plane spin valves with Co₂FeSi Heusler alloy

H. S. Goripati, T. Furubayashi, S. V. Karthik, T. M. Nakatani, Y. K. Takahashi, K. Hono^*

^*Corresponding author for this work

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

11 Citations (Scopus)

Abstract

We fabricated current-perpendicular-to-plane spin valves (SV) using Co ₂FeSi and Co₂(Cr_0.1Fe_0.9)Si Heusler alloys as ferromagnetic layers and a Ag spacer. The SV with Co ₂(Cr_0.1Fe_0.9)Si showed relatively large magnetoresistance (MR) ratio of 11.9 and the resistance change-area product (δRA) of 6.3 mω μm² at room temperature as compared to the MR ratio of 9.4 and the RA value of 4.1 mω μm² for the SV using Co₂FeSi. This indicates that the spin polarization of Co₂FeSi is enhanced by the substitution of Cr for Fe as suggested by a previous point contact Andreev reflection measurements. Considering the high Curie temperature of 993 K, the Co₂(Cr_0.1Fe _0.9)Si alloy could be promising material for spin polarized electron source.

Original language	English
Article number	043901
Journal	Journal of Applied Physics
Volume	109
Issue number	4
DOIs	https://doi.org/10.1063/1.3549722
Publication status	Published - 2011 Feb 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "The effect of substitution of Fe with Cr on the giant magnetoresistance of current-perpendicular-to-plane spin valves with Co2FeSi Heusler alloy",

abstract = "We fabricated current-perpendicular-to-plane spin valves (SV) using Co 2FeSi and Co2(Cr0.1Fe0.9)Si Heusler alloys as ferromagnetic layers and a Ag spacer. The SV with Co 2(Cr0.1Fe0.9)Si showed relatively large magnetoresistance (MR) ratio of 11.9 and the resistance change-area product (δRA) of 6.3 mω μm2 at room temperature as compared to the MR ratio of 9.4 and the RA value of 4.1 mω μm2 for the SV using Co2FeSi. This indicates that the spin polarization of Co2FeSi is enhanced by the substitution of Cr for Fe as suggested by a previous point contact Andreev reflection measurements. Considering the high Curie temperature of 993 K, the Co2(Cr0.1Fe 0.9)Si alloy could be promising material for spin polarized electron source.",

author = "Goripati, {H. S.} and T. Furubayashi and Karthik, {S. V.} and Nakatani, {T. M.} and Takahashi, {Y. K.} and K. Hono",

note = "Funding Information: H.S.G. and T.M.N. 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), (B) (Grant No. 20360322), Priority Area “Creation and control of spin current” (Grant No. 19048029), JST-PRESTO and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.",

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AU - Goripati, H. S.

AU - Furubayashi, T.

AU - Karthik, S. V.

AU - Nakatani, T. M.

AU - Takahashi, Y. K.

AU - Hono, K.

N1 - Funding Information: H.S.G. and T.M.N. 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), (B) (Grant No. 20360322), Priority Area “Creation and control of spin current” (Grant No. 19048029), JST-PRESTO and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.

PY - 2011/2/15

Y1 - 2011/2/15

N2 - We fabricated current-perpendicular-to-plane spin valves (SV) using Co 2FeSi and Co2(Cr0.1Fe0.9)Si Heusler alloys as ferromagnetic layers and a Ag spacer. The SV with Co 2(Cr0.1Fe0.9)Si showed relatively large magnetoresistance (MR) ratio of 11.9 and the resistance change-area product (δRA) of 6.3 mω μm2 at room temperature as compared to the MR ratio of 9.4 and the RA value of 4.1 mω μm2 for the SV using Co2FeSi. This indicates that the spin polarization of Co2FeSi is enhanced by the substitution of Cr for Fe as suggested by a previous point contact Andreev reflection measurements. Considering the high Curie temperature of 993 K, the Co2(Cr0.1Fe 0.9)Si alloy could be promising material for spin polarized electron source.

AB - We fabricated current-perpendicular-to-plane spin valves (SV) using Co 2FeSi and Co2(Cr0.1Fe0.9)Si Heusler alloys as ferromagnetic layers and a Ag spacer. The SV with Co 2(Cr0.1Fe0.9)Si showed relatively large magnetoresistance (MR) ratio of 11.9 and the resistance change-area product (δRA) of 6.3 mω μm2 at room temperature as compared to the MR ratio of 9.4 and the RA value of 4.1 mω μm2 for the SV using Co2FeSi. This indicates that the spin polarization of Co2FeSi is enhanced by the substitution of Cr for Fe as suggested by a previous point contact Andreev reflection measurements. Considering the high Curie temperature of 993 K, the Co2(Cr0.1Fe 0.9)Si alloy could be promising material for spin polarized electron source.

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The effect of substitution of Fe with Cr on the giant magnetoresistance of current-perpendicular-to-plane spin valves with Co₂FeSi Heusler alloy

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