Composition dependence of spin-orbit torque in Pt1-x Mnx /CoFeB heterostructures

K. Vihanga De Zoysa; Samik Duttagupta; Ryuichi Itoh; Yutaro Takeuchi; Hideo Ohno; Shunsuke Fukami

doi:10.1063/5.0011448

Composition dependence of spin-orbit torque in Pt_1-_xMn_x/CoFeB heterostructures

K. Vihanga De Zoysa, Samik Duttagupta, Ryuichi Itoh, Yutaro Takeuchi, Hideo Ohno, Shunsuke Fukami

Tohoku University

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

5 Citations (Scopus)

Abstract

We investigate spin-orbit torques (SOTs) in heterostructures with Pt1-xMnx alloy and CoFeB as a function of Mn composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies (ζ SL and ζ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ζ SL up to 0.21 is obtained at x = 0.20. Compared to the x dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.

Original language	English
Article number	012402
Journal	Applied Physics Letters
Volume	117
Issue number	1
DOIs	https://doi.org/10.1063/5.0011448
Publication status	Published - 2020 Jul 6

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title = "Composition dependence of spin-orbit torque in Pt1-x Mnx /CoFeB heterostructures",

abstract = "We investigate spin-orbit torques (SOTs) in heterostructures with Pt1-xMnx alloy and CoFeB as a function of Mn composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies (ζ SL and ζ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ζ SL up to 0.21 is obtained at x = 0.20. Compared to the x dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.",

author = "{Vihanga De Zoysa}, K. and Samik Duttagupta and Ryuichi Itoh and Yutaro Takeuchi and Hideo Ohno and Shunsuke Fukami",

note = "Funding Information: We thank B. Jinnai, T. Hirata, H. Iwanuma, K. Goto, and C. Igarashi for their technical support. We also thank T. Dietl and M. Stiles for fruitful discussions. A portion of this work was supported by the ImPACT Program of CSTI, JSPS Kakenhi Nos. 17H06093 and 19H05622, JST-CREST No. JPMJCR19K3, the JSPS Core-to-Core Program, and RIEC Cooperative Research Projects. K.V.D.Z. acknowledges WISE Program for AIE for financial support. Publisher Copyright: {\textcopyright} 2020 Author(s).",

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AU - Vihanga De Zoysa, K.

AU - Duttagupta, Samik

AU - Itoh, Ryuichi

AU - Takeuchi, Yutaro

AU - Ohno, Hideo

AU - Fukami, Shunsuke

N1 - Funding Information: We thank B. Jinnai, T. Hirata, H. Iwanuma, K. Goto, and C. Igarashi for their technical support. We also thank T. Dietl and M. Stiles for fruitful discussions. A portion of this work was supported by the ImPACT Program of CSTI, JSPS Kakenhi Nos. 17H06093 and 19H05622, JST-CREST No. JPMJCR19K3, the JSPS Core-to-Core Program, and RIEC Cooperative Research Projects. K.V.D.Z. acknowledges WISE Program for AIE for financial support. Publisher Copyright: © 2020 Author(s).

PY - 2020/7/6

Y1 - 2020/7/6

N2 - We investigate spin-orbit torques (SOTs) in heterostructures with Pt1-xMnx alloy and CoFeB as a function of Mn composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies (ζ SL and ζ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ζ SL up to 0.21 is obtained at x = 0.20. Compared to the x dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.

AB - We investigate spin-orbit torques (SOTs) in heterostructures with Pt1-xMnx alloy and CoFeB as a function of Mn composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies (ζ SL and ζ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ζ SL up to 0.21 is obtained at x = 0.20. Compared to the x dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.

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Composition dependence of spin-orbit torque in Pt_1-_xMn_x/CoFeB heterostructures

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