@article{f201e5c03b7a4cbc92dfbc56ef153901,
title = "Enhanced spin-orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures",
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.",
author = "Lee, {Hae Yeon} and Sanghoon Kim and Park, {June Young} and Oh, {Young Wan} and Park, {Seung Young} and Wooseung Ham and Yoshinori Kotani and Tetsuya Nakamura and Motohiro Suzuki and Teruo Ono and Lee, {Kyung Jin} and Park, {Byong Guk}",
note = "Funding Information: This work was supported by the National Research Foundation of Korea (Grant Nos. NRF-2015M3D1A1070465, 2017R1A2A2A05069760, and 2017M2A2A6A01071238), the Basic Research Laboratory Program through the National Research Foundation of Korea (NRF) funded by the MSIT (Grant No. NRF-2018R1A4A1020696), and the National Research Council of Science and Technology (NST) (Grant No. CAP-16-01-KIST). This research was also supported in part by JSPS KAKENHI Grant Nos. 26870300, 17H04924, 17H05181, 17H03377, and 15H05702 and the Center for Spintronics Research Network (CSRN). The XMCD experiments were performed at the SPring-8 synchrotron radiation facility with the approval of JASRI (Proposal Nos. 2017B0117, 2017B0924, 2017B0925, and 2017B0125). Publisher Copyright: {\textcopyright} 2019 Author(s).",
year = "2019",
month = mar,
day = "1",
doi = "10.1063/1.5084201",
language = "English",
volume = "7",
journal = "APL Materials",
issn = "2166-532X",
publisher = "American Institute of Physics Publising LLC",
number = "3",
}