Long-range chiral exchange interaction in synthetic antiferromagnets

Authors
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
Issue Date
2019-07
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v.18, no.7, pp.703 - +
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.
Keywords
CURRENT-DRIVEN DYNAMICS; DOMAIN-WALL MOTION; MAGNETIZATION; TEMPERATURE; TORQUE; CURRENT-DRIVEN DYNAMICS; DOMAIN-WALL MOTION; MAGNETIZATION; TEMPERATURE; TORQUE; Dzyaloshinskii?Moriya interaction; Exchange interaction; Chirality
ISSN
1476-1122
URI
https://pubs.kist.re.kr/handle/201004/119851
DOI
10.1038/s41563-019-0370-z
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KIST Article > 2019
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