期刊
NATURE MATERIALS
卷 18, 期 7, 页码 703-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0370-z
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资金
- MaHoJeRo (DAAD Spintronics network) [57334897]
- German Research Foundation [SFB TRR 173]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [709151]
- National Research Foundation (NRF) of Korea - Korea government (MEST) [2017R1A2B3007918, 2016M3A7B4910400]
- NRF of South Korea [2017R1A2B3002621, 2015M3D1A1070465]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 2137, MO 1731/7-1, MO 1731/5-1]
- Korea Institute of Science and Technology (KIST) institutional program [2E29410]
- National Research Council of Science & Technology (NST) grant - Korea government (Ministry of Science and ICT) [CAP-16-01-KIST]
- DFG [SI 1720/2-1]
- Marie Curie Actions (MSCA) [709151] Funding Source: Marie Curie Actions (MSCA)
- National Research Foundation of Korea [2017R1A2B3002621, 2017R1A2B3007918] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The exchange interaction governs static and dynamic magnetism. This fundamental interaction comes in two flavours-symmetric and antisymmetric. The symmetric interaction leads to ferro- and antiferromagnetism, and the antisymmetric interaction has attracted significant interest owing to its major role in promoting topologically non-trivial spin textures that promise fast, energy-efficient devices. So far, the antisymmetric exchange interaction has been found to be rather short ranged and limited to a single magnetic layer. Here we report a long-range antisymmetric interlayer exchange interaction in perpendicularly magnetized synthetic antiferromagnets with parallel and antiparallel magnetization alignments. Asymmetric hysteresis loops under an in-plane field reveal a unidirectional and chiral nature of this interaction, which results in canted magnetic structures. We explain our results by considering spin-orbit coupling combined with reduced symmetry in multilayers. Our discovery of a long-range chiral interaction provides an additional handle to engineer magnetic structures and could enable three-dimensional topological structures.
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