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Long-range chiral exchange interaction in synthetic antiferromagnets
- Long-range chiral exchange interaction in synthetic antiferromagnets
- Han, Dong-Soo; Lee, Kyujoon; Hanke, Jan-Philipp; Mokrousov, Yuriy; Kim, Kyoung-Whan; Yoo, Woosuk; van Hees, Youri L. W.; Kim, Tae-Wan; Lavrijsen, Reinoud; You, Chun-Yeol; Swagten, Henk J. M.; Jung, Myung-Hwa; Klaeui, Mathias
- DGIST Authors
- You, Chun-Yeol
- Issue Date
- Nature Materials, 18(7), 703-708
- Article Type
- Energy efficiency; Exchange interactions; Magnetic structure; Magnetism; Textures; Topology; Antiparallel magnetizations; Antisymmetric exchange interactions; Asymmetric hysteresis; Energy efficient; In-plane fields; Interlayer exchange interactions; Synthetic antiferromagnets; Topological structure; Antiferromagnetic materials
- 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. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
- Nature Publishing Group
- Related Researcher
Spin Phenomena for Information Nano-devices(SPIN) Lab
Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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- Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles
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