Large Dzyaloshinskii-Moriya interaction and room-temperature nanoscale skyrmions in CoFeB/MgO heterostructures

被引：31

作者：

Chen, Runze ^{[1
]}

Wang, Xinran ^{[1
,2
]}

Cheng, Houyi ^{[1
,3
]}

Lee, Kyu-Joon ^{[4
]}

Xiong, Danrong ^{[1
]}

Kim, Jun-Young ^{[4
]}

Li, Sai ^{[1
]}

Yang, Hongxin ^{[5
]}

Zhang, Hongchao ^{[1
,2
]}

Cao, Kaihua ^{[1
,2
]}

Klaui, Mathias ^{[4
]}

Peng, Shouzhong ^{[1
,3
]}

Zhang, Xueying ^{[1
,2
]}

Zhao, Weisheng ^{[1
,2
,3
]}

机构：

[1] Beihang Univ, Beijing Adv Innovat Ctr Big Data & Brain Comp, Sch Integrated Circuit Sci & Engn, Fert Beijing Inst, Beijing 100191, Peoples R China

[2] Beihang Univ, Beihang Goertek Joint Microelect Inst, Qingdao Res Inst, Qingdao 266000, Peoples R China

[3] Beihang Univ, Hefei Innovat Res Inst, Hefei 230013, Peoples R China

[4] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[5] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China

来源：

CELL REPORTS PHYSICAL SCIENCE | 2021年 / 2卷 / 11期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC SKYRMIONS; ANISOTROPY; EXCHANGE; DYNAMICS;

D O I：

10.1016/j.xcrp.2021.100618

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：18

共 76 条

[1] Effect of Mo insertion layers on the magnetoresistance and perpendicular magnetic anisotropy in Ta/CoFeB/MgO junctions [J].