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Giant Spin-Orbit Torque in Sputter-Deposited Bi Films.

ABSTRACT: 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.

SUBMITTER: Kim S

PROVIDER: S-EPMC10625106 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature

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Giant Spin-Orbit Torque in Sputter-Deposited Bi Films.

Kim Sumin S Lee Hyun-Woo HW Choi Gyung-Min GM

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20230907 31

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 ...[more]

PMID: 37679062

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