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Role of top and bottom interfaces of a Pt/Co/AlOx system in Dzyaloshinskii-Moriya interaction, interface perpendicular magnetic anisotropy, and magneto-optical Kerr effect

Title
Role of top and bottom interfaces of a Pt/Co/AlOx system in Dzyaloshinskii-Moriya interaction, interface perpendicular magnetic anisotropy, and magneto-optical Kerr effect
Authors
Kim, Nam-HuiCho, JaehunJung, JinyongHan, Dong-SooYin, YuxiangKim, June-SeoSwagten, Henk J. M.Lee, KyujoonJung, Myung-HwaYou, Chun-Yeol
DGIST Authors
Kim, Nam-Hui; Jung, Jinyong; Kim, June-Seo; You, Chun-Yeol
Issue Date
2017-03
Citation
Aip Advances, 7(3)
Type
Article
Article Type
Article
Keywords
Chiral Spin TorqueDomain WallsDynamicsExchangeFilmsMotionSkyrmionsThickness Dependence
ISSN
2158-3226
Abstract
We investigate the role of top and bottom interfaces in inversion symmetry-breaking Pt/Co/AlOx systems by inserting ultra-thin Cu layers. Wedge-type ultrathin Cu layers (0-0.5 nm) are introduced between Pt/Co or Co/AlOx interfaces. Interface sensitive physical quantities such as the interfacial Dzyaloshinskii-Moriya interaction (iDMI) energy density, the interfacial perpendicular magnetic anisotropy (iPMA), and the magneto-optical Kerr effects (MOKE) are systematically measured as a function of Cu-insertion layer thickness. We find that the Cu-insertion layer in the bottom interface (Pt/Co) plays a more important role in iDMI, PMA, and MOKE. In contrast, the top interface (Co/AlOx) noticeably contributes to only PMA, while its contributions to iDMI and MOKE enhancement are less significant. Although the PMA mainly comes from the bottom interface (Pt/Co), the Cu-insertion layers of all interfaces (Pt/Co, Co/AlOx) influence PMA. For iDMI, only the Cu-insertion layer in the bottom interface exerts SOC suppression which leads iDMI energy to decrease rapidly. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.
URI
http://hdl.handle.net/20.500.11750/4230
DOI
10.1063/1.4978867
Publisher
AMER INST PHYSICS
Files:
There are no files associated with this item.
Collection:
DGIST-LBNL Research Center for Emerging Materials1. Journal Articles
Emerging Materials ScienceETC1. Journal Articles


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