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Authors: Chen, Runze
Wang, Xinran
Cheng, Houyi
Lee, Kyu-Joon
Xiong, Danrong
Kim, Jun-Young
Li, Sai
Yang, Hongxin
Zhang, Hongchao
Cao, Kaihua
Kläui, Mathias
Peng, Shouzhong
Zhang, Xueying
Zhao, Weisheng
Title: Large Dzyaloshinskii-Moriya interaction and room-temperature nanoscale skyrmions in CoFeB/MgO heterostructures
Online publication date: 7-Jul-2022
Language: english
Abstract: Magnetic skyrmions in heavy metal (HM)/CoFeB/MgO structures are of particular interest for skyrmion-based magnetic tunnel junction (MTJ) devices because of their reliable generation, stability, and readout through purely electrical methods. To optimize the properties, such as stability, a strong Dzyaloshinskii-Moriya interaction (DMI) is required at room temperature. Here, using first-principles calculations, we demonstrate that huge DMI can be obtained in Ir/ CoFe structures with an Fe-terminated configuration. Moreover, Brillouin light-scattering measurements show that indeed Ta/Ir/Co20Fe60B20/MgO thin films with perpendicular magnetic anisotropy exhibit a large DMI value (1.13 mJ/m(2)) when the thickness of the CoFeB layer is 1.1 nm, which can be attributed to the smooth and Fe-rich interface between Ir and CoFeB layers. Furthermore, we observe stable sub-100 nm magnetic skyrmions at room temperature in the Ir/CoFeB/MgO systems by magnetic force microscope. This work paves the way for promoting the application of skyrmions in CoFeB/ MgO-based perpendicular anisotropy MTJ structures.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: CC BY-NC-ND
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Journal: Cell reports
Pages or article number: 19
Publisher: Cell Press
Publisher place: Maryland Heights, MO
Issue date: 2021
ISSN: 2666-3864
Publisher DOI: 10.1016/j.xcrp.2021.100618
Appears in collections:JGU-Publikationen

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