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タイトル: | Enhanced spin–orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures |
著者: | Lee, Hae-Yeon Kim, Sanghoon Park, June-Young Oh, Young-Wan Park, Seung-Young Ham, Wooseung Kotani, Yoshinori Nakamura, Tetsuya Suzuki, Motohiro Ono, Teruo Lee, Kyung-Jin Park, Byong-Guk |
著者名の別形: | 小谷, 佳範 中村, 哲也 鈴木, 基寛 小野, 輝男 |
発行日: | Mar-2019 |
出版者: | AIP Publishing |
誌名: | APL Materials |
巻: | 7 |
号: | 3 |
論文番号: | 031110 |
抄録: | Spin-orbit torque facilitates efficient magnetisation switching via an in-plane current in perpendicularly magnetised heavy-metal/ferromagnet heterostructures. The efficiency of spin-orbit-torque-induced switching is determined by the charge-to-spin conversion arising from either bulk or interfacial spin-orbit interactions or both. Here, we demonstrate that the spin-orbit torque and the resultant switching efficiency in Pt/CoFeB systems are significantly enhanced by an interfacial modification involving Ti insertion between the Pt and CoFeB layers. Spin pumping and X-ray magnetic circular dichroism experiments reveal that this enhancement is due to an additional interface-generated spin current of the non-magnetic interface and/or improved spin transparency achieved by suppressing the proximity-induced moment in the Pt layer. Our results demonstrate that interface engineering affords an effective approach to improve spin–orbit torque and thereby magnetisation switching efficiency. |
著作権等: | © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
URI: | http://hdl.handle.net/2433/242943 |
DOI(出版社版): | 10.1063/1.5084201 |
出現コレクション: | 学術雑誌掲載論文等 |
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