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However, previous electrical detections have reported controversial results for the conversion efficiency. In this study, an optical detection of a spin\u2010orbit torque is reported in a Bi\/CoFeB bilayer with a polycrystalline texture of (012) and (003). Taking advantage of the optical detection, spin\u2010orbit torque is accurately separated from the Oersted field and achieves a giant damping\u2010like torque efficiency of +0.5, verifying efficient charge\u2010to\u2010spin conversion. This study also demonstrates a field\u2010like torque efficiency of \u22120.1. For the mechanism of the charge\u2010to\u2010spin conversion, the bulk spin Hall effect and the interface Rashba\u2010Edelstein effect are considered.<\/jats:p>","DOI":"10.1002\/advs.202303831","type":"journal-article","created":{"date-parts":[[2023,9,7]],"date-time":"2023-09-07T21:46:02Z","timestamp":1694123162000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Giant Spin\u2010Orbit Torque in Sputter\u2010Deposited Bi Films"],"prefix":"10.1002","volume":"10","author":[{"given":"Sumin","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Energy Science Sungkyunkwan University  Suwon 16419 South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyun\u2010Woo","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology  Pohang 37673 South Korea"},{"name":"Asia Pacific Center for Theoretical Physics  77 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