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Dc M, Chen JY, Peterson T, Sahu P, Ma B, Mousavi N, Harjani R, Wang JP. Observation of High Spin-to-Charge Conversion by Sputtered Bismuth Selenide Thin Films at Room Temperature. Nano Lett 2019; 19:4836-4844. [PMID: 31283247 DOI: 10.1021/acs.nanolett.8b05011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigated spin-to-charge conversion in sputtered Bi43Se57/Co20Fe60B20 heterostructures with in-plane magnetization at room temperature. High spin-to-charge conversion voltage signals have been observed at room temperature. The transmission electron microscope images show that the sputtered bismuth selenide thin films are nanogranular in structure. The spin-pumping voltage decreases with an increase in the size of the grains. The inverse Edelstein effect length (λIEE) is estimated to be as large as 0.32 nm. The large λIEE is due to the spin-momentum locking and is further enhanced by quantum confinement in the nanosized grains of the sputtered bismuth selenide films. We also investigated the effect on spin-pumping voltage due to the insertion of layers of MgO and Ag. The MgO insertion layer has almost completely suppressed the spin-pumping voltage, whereas the Ag insertion layer has enhanced the λIEE by 43%.
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Affiliation(s)
- Mahendra Dc
- School of Physics and Astronomy , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Jun-Yang Chen
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Thomas Peterson
- School of Physics and Astronomy , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Protuysh Sahu
- School of Physics and Astronomy , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Bin Ma
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Naser Mousavi
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Ramesh Harjani
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Jian-Ping Wang
- School of Physics and Astronomy , University of Minnesota , Minneapolis , Minnesota 55455 , United States
- Department of Electrical and Computer Engineering , University of Minnesota , Minneapolis , Minnesota 55455 , United States
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