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Long-range chiral exchange interaction in synthetic antiferromagnets

Title
Long-range chiral exchange interaction in synthetic antiferromagnets
Author(s)
Han, Dong-SooLee, KyujoonHanke, Jan-PhilippMokrousov, YuriyKim, Kyoung-WhanYoo, Woosukvan Hees, Youri L. W.Kim, Tae-WanLavrijsen, ReinoudYou, Chun-YeolSwagten, Henk J. M.Jung, Myung-HwaKlaeui, Mathias
Issued Date
2019-07
Citation
Nature Materials, v.18, no.7, pp.703 - 708
Type
Article
Keywords
Exchange interactionsMagnetic structureMagnetismTexturesEnergy efficiencyTopologyAntiparallel magnetizationsAntisymmetric exchange interactionsAsymmetric hysteresisEnergy efficientIn-plane fieldsInterlayer exchange interactionsSynthetic antiferromagnetsTopological structureAntiferromagnetic materials
ISSN
1476-1122
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/10092
DOI
10.1038/s41563-019-0370-z
Publisher
Nature Publishing Group
Related Researcher
  • 유천열 You, Chun-Yeol
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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Department of Physics and Chemistry Spin Phenomena for Information Nano-devices(SPIN) Lab 1. Journal Articles

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