We investigated spin-to-charge current conversion in sputtered Y3Fe5O12 (YIG)/granular bismuth selenide (GBS) bi-layers at room temperature. The spin current is pumped to the GBS layer by the precession of magnetization at ferromagnetic resonance in the YIG layer. The spin-mixing conductance is determined to be as large as (13.64 ± 1.32) × 1018 m−2, which is larger than that of YIG/Pt and comparable or better than that of YIG/crystalline bismuth selenide indicating that GBS is a good spin-sink. The figure of merit of spin-to-charge conversion, the inverse Edelstein effect length (), is estimated to be as large as (0.11 ± 0.03) nm. shows GBS film thickness dependence, and its value is three times as large as in crystalline bismuth selenide. The value larger than that of crystalline bismuth selenide and other topological insulators indicates that the spin-to-charge conversion is due to the spin-momentum locking. As the thickness of GBS increases, decreases, which means the figure-of-merit of spin-to-charge conversion is influenced by grain size.
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11 March 2019
Research Article|
March 12 2019
Room-temperature spin-to-charge conversion in sputtered bismuth selenide thin films via spin pumping from yttrium iron garnet
Mahendra DC;
Mahendra DC
a)
1
School of Physics and Astronomy, University of Minnesota
, Minneapolis, Minnesota 55455, USA
a)Author to whom correspondence should be addressed: [email protected].
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Tao Liu;
Tao Liu
2
Department of Physics, Colorado State University
, Fort Collins, Colorado 80523, USA
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Jun-Yang Chen
;
Jun-Yang Chen
3
Department of Electrical and Computer Engineering, University of Minnesota
, Minneapolis, Minnesota 55455, USA
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Thomas Peterson;
Thomas Peterson
1
School of Physics and Astronomy, University of Minnesota
, Minneapolis, Minnesota 55455, USA
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Protyush Sahu;
Protyush Sahu
1
School of Physics and Astronomy, University of Minnesota
, Minneapolis, Minnesota 55455, USA
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Hongshi Li;
Hongshi Li
4
Department of Chemical Engineering and Materials Science, University of Minnesota
, Minneapolis, Minnesota 55455, USA
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Zhengyang Zhao
;
Zhengyang Zhao
3
Department of Electrical and Computer Engineering, University of Minnesota
, Minneapolis, Minnesota 55455, USA
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Mingzhong Wu;
Mingzhong Wu
2
Department of Physics, Colorado State University
, Fort Collins, Colorado 80523, USA
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Jian-Ping Wang
Jian-Ping Wang
a)
1
School of Physics and Astronomy, University of Minnesota
, Minneapolis, Minnesota 55455, USA
3
Department of Electrical and Computer Engineering, University of Minnesota
, Minneapolis, Minnesota 55455, USA
4
Department of Chemical Engineering and Materials Science, University of Minnesota
, Minneapolis, Minnesota 55455, USA
a)Author to whom correspondence should be addressed: [email protected].
Search for other works by this author on:
Mahendra DC
1,a)
Tao Liu
2
Jun-Yang Chen
3
Thomas Peterson
1
Protyush Sahu
1
Hongshi Li
4
Zhengyang Zhao
3
Mingzhong Wu
2
Jian-Ping Wang
1,3,4,a)
1
School of Physics and Astronomy, University of Minnesota
, Minneapolis, Minnesota 55455, USA
2
Department of Physics, Colorado State University
, Fort Collins, Colorado 80523, USA
3
Department of Electrical and Computer Engineering, University of Minnesota
, Minneapolis, Minnesota 55455, USA
4
Department of Chemical Engineering and Materials Science, University of Minnesota
, Minneapolis, Minnesota 55455, USA
a)Author to whom correspondence should be addressed: [email protected].
Appl. Phys. Lett. 114, 102401 (2019)
Article history
Received:
September 03 2018
Accepted:
February 07 2019
Citation
Mahendra DC, Tao Liu, Jun-Yang Chen, Thomas Peterson, Protyush Sahu, Hongshi Li, Zhengyang Zhao, Mingzhong Wu, Jian-Ping Wang; Room-temperature spin-to-charge conversion in sputtered bismuth selenide thin films via spin pumping from yttrium iron garnet. Appl. Phys. Lett. 11 March 2019; 114 (10): 102401. https://doi.org/10.1063/1.5054806
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