Long-range chiral exchange interaction in synthetic antiferromagnets

Title
Long-range chiral exchange interaction in synthetic antiferromagnets
Authors
김경환한동수이규준Jan-Philipp HankeYuriy Mokrousov유우석Youri L. W. van Hees김태완Reinoud Lavrijsen유천열Henk J. M. Swagten정명화Mathias Klaui
Keywords
Dzyaloshinskii?Moriya interaction; Exchange interaction; Chirality
Issue Date
2019-07
Publisher
Nature materials
Citation
VOL 18-708
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.
URI
http://pubs.kist.re.kr/handle/201004/69520
ISSN
1476-1122
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KIST Publication > Article
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