Bi-quadratic interlayer exchange coupling in Co 2MnSi/Ag/Co 2MnSi pseudo spin-valve

Hari S. Goripati; Masamitsu Hayashi; T. Furubayashi; T. Taniguchi; H. Sukegawa; Y. K. Takahashi; K. Hono

doi:10.1063/1.3671634

Bi-quadratic interlayer exchange coupling in Co ₂MnSi/Ag/Co ₂MnSi pseudo spin-valve

Hari S. Goripati, Masamitsu Hayashi^*, T. Furubayashi, T. Taniguchi, H. Sukegawa, Y. K. Takahashi, K. Hono

^*Corresponding author for this work

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

8 Citations (Scopus)

Abstract

Bi-quadratic interlayer exchange coupling is found below 100 K in a Co ₂MnSi/Ag/Co ₂MnSi current-perpendicular-to-plane pseudo spin valves. The bi-quadratic coupling constant J ₂ was estimated to be ∼-0.30 erg/cm ² at 5 K and the strong temperature dependence of the coupling strength points its likely origin to the loose spin model. Application of current of ∼2 × 10 ⁷ A/cm ² below 100 K leads to an increase in the magnetoresistance (MR), indicating current induced antiparallel alignment of the two magnetic layers. These results strongly suggest that the presence of the bi-quadratic interlayer exchange coupling causes the reduction of the magnetoresistance at low temperature and illustrates the importance of understanding the influence of interlayer exchange coupling on magnetization configuration in magnetic nanostructures.

Original language	English
Article number	123914
Journal	Journal of Applied Physics
Volume	110
Issue number	12
DOIs	https://doi.org/10.1063/1.3671634
Publication status	Published - 2011 Dec 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Bi-quadratic interlayer exchange coupling in Co 2MnSi/Ag/Co 2MnSi pseudo spin-valve",

abstract = "Bi-quadratic interlayer exchange coupling is found below 100 K in a Co 2MnSi/Ag/Co 2MnSi current-perpendicular-to-plane pseudo spin valves. The bi-quadratic coupling constant J 2 was estimated to be ∼-0.30 erg/cm 2 at 5 K and the strong temperature dependence of the coupling strength points its likely origin to the loose spin model. Application of current of ∼2 × 10 7 A/cm 2 below 100 K leads to an increase in the magnetoresistance (MR), indicating current induced antiparallel alignment of the two magnetic layers. These results strongly suggest that the presence of the bi-quadratic interlayer exchange coupling causes the reduction of the magnetoresistance at low temperature and illustrates the importance of understanding the influence of interlayer exchange coupling on magnetization configuration in magnetic nanostructures.",

author = "Goripati, {Hari S.} and Masamitsu Hayashi and T. Furubayashi and T. Taniguchi and H. Sukegawa and Takahashi, {Y. K.} and K. Hono",

note = "Funding Information: H.S.G. thanks the National Institute for Materials Science for the NIMS junior research assistantship. T.T. is supported by JSPS. This work was in part supported by the Grant-in-Aid for Scientific Research (A) (Grant No. 2224609 ), (B) (Grant No. 20360322 ), and Priority Area “Creation and control of spin current” (Grant No. 19048029 ).",

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doi = "10.1063/1.3671634",

language = "English",

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T1 - Bi-quadratic interlayer exchange coupling in Co 2MnSi/Ag/Co 2MnSi pseudo spin-valve

AU - Goripati, Hari S.

AU - Hayashi, Masamitsu

AU - Furubayashi, T.

AU - Taniguchi, T.

AU - Sukegawa, H.

AU - Takahashi, Y. K.

AU - Hono, K.

N1 - Funding Information: H.S.G. thanks the National Institute for Materials Science for the NIMS junior research assistantship. T.T. is supported by JSPS. This work was in part supported by the Grant-in-Aid for Scientific Research (A) (Grant No. 2224609 ), (B) (Grant No. 20360322 ), and Priority Area “Creation and control of spin current” (Grant No. 19048029 ).

PY - 2011/12/15

Y1 - 2011/12/15

N2 - Bi-quadratic interlayer exchange coupling is found below 100 K in a Co 2MnSi/Ag/Co 2MnSi current-perpendicular-to-plane pseudo spin valves. The bi-quadratic coupling constant J 2 was estimated to be ∼-0.30 erg/cm 2 at 5 K and the strong temperature dependence of the coupling strength points its likely origin to the loose spin model. Application of current of ∼2 × 10 7 A/cm 2 below 100 K leads to an increase in the magnetoresistance (MR), indicating current induced antiparallel alignment of the two magnetic layers. These results strongly suggest that the presence of the bi-quadratic interlayer exchange coupling causes the reduction of the magnetoresistance at low temperature and illustrates the importance of understanding the influence of interlayer exchange coupling on magnetization configuration in magnetic nanostructures.

AB - Bi-quadratic interlayer exchange coupling is found below 100 K in a Co 2MnSi/Ag/Co 2MnSi current-perpendicular-to-plane pseudo spin valves. The bi-quadratic coupling constant J 2 was estimated to be ∼-0.30 erg/cm 2 at 5 K and the strong temperature dependence of the coupling strength points its likely origin to the loose spin model. Application of current of ∼2 × 10 7 A/cm 2 below 100 K leads to an increase in the magnetoresistance (MR), indicating current induced antiparallel alignment of the two magnetic layers. These results strongly suggest that the presence of the bi-quadratic interlayer exchange coupling causes the reduction of the magnetoresistance at low temperature and illustrates the importance of understanding the influence of interlayer exchange coupling on magnetization configuration in magnetic nanostructures.

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Bi-quadratic interlayer exchange coupling in Co ₂MnSi/Ag/Co ₂MnSi pseudo spin-valve

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