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
Year of first publication:	2021
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
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7323
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY-NC-ND
Information on rights of use:	https://creativecommons.org/licenses/by-nc-nd/4.0/
Journal:	Cell reports 2 11
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