Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys

S. V. Karthik; A. Rajanikanth; T. M. Nakatani; Z. Gercsi; Y. K. Takahashi; T. Furubayashi; K. Inomata; K. Hono

doi:10.1063/1.2769175

Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys

S. V. Karthik^*, A. Rajanikanth, T. M. Nakatani, Z. Gercsi, Y. K. Takahashi, T. Furubayashi, K. Inomata, K. Hono

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2 Crx Fe1-x Si alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L 21 ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0x0.5. We propose the composition range of 0.02x0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance.

Original language	English
Article number	043903
Journal	Journal of Applied Physics
Volume	102
Issue number	4
DOIs	https://doi.org/10.1063/1.2769175
Publication status	Published - 2007
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{6b1c4767f16f4e3aa2f285d777e76b0d,

title = "Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys",

abstract = "We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2 Crx Fe1-x Si alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L 21 ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0x0.5. We propose the composition range of 0.02x0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance.",

author = "Karthik, {S. V.} and A. Rajanikanth and Nakatani, {T. M.} and Z. Gercsi and Takahashi, {Y. K.} and T. Furubayashi and K. Inomata and K. Hono",

note = "Funding Information: S.V.K., A.R., and T.M.N. acknowledge the National Institute for Materials Science (NIMS) for providing NIMS junior research assistanceships. Z.G. is grateful to Japan Society for the Promotion of Science (JSPS) for the provision of a JSPS fellowship. This work was in part supported by the Ministry of Education, Science, Sports, and Culture of Japan, Grant-in-Aid for Young Scientists (B), 18760537, 2006.",

year = "2007",

doi = "10.1063/1.2769175",

language = "English",

volume = "102",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "4",

}

TY - JOUR

T1 - Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys

AU - Karthik, S. V.

AU - Rajanikanth, A.

AU - Nakatani, T. M.

AU - Gercsi, Z.

AU - Takahashi, Y. K.

AU - Furubayashi, T.

AU - Inomata, K.

AU - Hono, K.

N1 - Funding Information: S.V.K., A.R., and T.M.N. acknowledge the National Institute for Materials Science (NIMS) for providing NIMS junior research assistanceships. Z.G. is grateful to Japan Society for the Promotion of Science (JSPS) for the provision of a JSPS fellowship. This work was in part supported by the Ministry of Education, Science, Sports, and Culture of Japan, Grant-in-Aid for Young Scientists (B), 18760537, 2006.

PY - 2007

Y1 - 2007

N2 - We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2 Crx Fe1-x Si alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L 21 ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0x0.5. We propose the composition range of 0.02x0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance.

AB - We have investigated the effect of Cr substitution for Fe on the spin polarization, P, of Co2 Crx Fe1-x Si alloys using the point contact Andreev reflection method. A steep increase from P=0.57 to P=0.64 occurs by a small substitution of Cr for Fe of x=0.02, thereafter P values are constant for higher Cr concentrations up to x=0.4. The increase in spin polarization can be attributed to both the improved L 21 ordering found experimentally as well as the half-metallicity predicted by ab initio calculations in the composition range of 0x0.5. We propose the composition range of 0.02x0.1 is the most promising for ferromagnetic electrodes of magnetic tunneling junctions to achieve high tunneling magnetoresistance.

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DO - 10.1063/1.2769175

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VL - 102

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 4

M1 - 043903

ER -

Effect of Cr substitution for Fe on the spin polarization of Co2 Crx Fe1-x Si Heusler alloys

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