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Giant Spin-Orbit Torque in Sputter-Deposited Bi Films

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Title
Giant Spin-Orbit Torque in Sputter-Deposited Bi Films
Author(s)
Kim, Sumin; Lee, Hyun-Woo; Gyung-Min Choi
Publication Date
2023-11
Journal
ADVANCED SCIENCE, v.10, no.31
Publisher
WILEY
Abstract
© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH. Bismuth (Bi) has the strongest spin-orbit coupling among non-radioactive elements and is thus a promising material for efficient charge-to-spin conversion. However, previous electrical detections have reported controversial results for the conversion efficiency. In this study, an optical detection of a spin-orbit torque is reported in a Bi/CoFeB bilayer with a polycrystalline texture of (012) and (003). Taking advantage of the optical detection, spin-orbit torque is accurately separated from the Oersted field and achieves a giant damping-like torque efficiency of +0.5, verifying efficient charge-to-spin conversion. This study also demonstrates a field-like torque efficiency of -0.1. For the mechanism of the charge-to-spin conversion, the bulk spin Hall effect and the interface Rashba-Edelstein effect are considered. Spin-orbit torque from polycrystalline bismuth (Bi) film is investigated using an optical method of magneto-optical Kerr effect (MOKE). Employing the spatial and vector resolution of the MOKE microscopy, damping-like torque (hDL) and field-like torque (hFL) are clearly separated from the Oersted field (hOe). Large torque efficiencies of +0.5 and -0.1, respectively for hDL and hFL, are achieved.image
URI
https://pr.ibs.re.kr/handle/8788114/14133
DOI
10.1002/advs.202303831
ISSN
2198-3844
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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