期刊
NANO LETTERS
卷 18, 期 2, 页码 980-986出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04400
关键词
Skyrmion; antiferromagnet; exchange bias; zero field; room temperature; thin films
类别
资金
- Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [SC0012670]
- National Science Foundation [ECCS 1611570]
- CSPIN
- FAME, a Semiconductor Research Corporation program - MARCO
- DARPA
- Army Research Office
- Air Force Office of Scientific Research PECASE award
- NSF
- National Key R&D Program of China [2017YFA0206200, 2016YFA0302300]
- National Science Foundation of China [11774194]
- 1000 Youth talent program of China
- State Key Laboratory of Low-Dimensional Quantum Physics
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- [W911NF-16-1-0472]
Magnetic skyrmions as swirling spin textures with a nontrivial topology have potential applications as magnetic memory and storage devices. Since the initial discovery of skyrmions in non-centrosymmetric B20 materials, the recent effort has focused on exploring room-temperature skyrmions in heavy metal and ferromagnetic heterostructures, a material platform compatible with existing spintronic manufacturing technology. Here, we report the surprising observation that a room-temperature skyrmion phase can be stabilized in an entirely different class of systems based on antiferromagnetic (AFM) metal and ferromagnetic (FM) metal IrMn/CoFeB heterostructures. There are a number of distinct advantages of exploring skyrmions in such heterostructures including zero-field stabilization, tunable antiferromagnetic order, and sizable spin-orbit torque (SOT) for energy-efficient current manipulation. Through direct spatial imaging of individual skyrmions, quantitative evaluation of the interfacial Dzyaloshinskii-Moriya interaction, and demonstration of current-driven skyrmion motion, our findings firmly establish the AFM/FM heterostructures as a promising material platform for exploring skyrmion physics and device applications.
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