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Title: Enhanced spin–orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures
Authors: Lee, Hae-Yeon
Kim, Sanghoon
Park, June-Young
Oh, Young-Wan
Park, Seung-Young
Ham, Wooseung
Kotani, Yoshinori
Nakamura, Tetsuya
Suzuki, Motohiro
Ono, Teruo  kyouindb  KAKEN_id
Lee, Kyung-Jin
Park, Byong-Guk
Author's alias: 小谷, 佳範
中村, 哲也
鈴木, 基寛
小野, 輝男
Issue Date: Mar-2019
Publisher: AIP Publishing
Journal title: APL Materials
Volume: 7
Issue: 3
Thesis number: 031110
Abstract: 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.
Rights: © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (
DOI(Published Version): 10.1063/1.5084201
Appears in Collections:Journal Articles

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