Long-range chiral exchange interaction in synthetic antiferromagnets
- Long-range chiral exchange interaction in synthetic antiferromagnets
- 김경환; 한동수; 이규준; Jan-Philipp Hanke; Yuriy Mokrousov; 유우석; Youri L. W. van Hees; 김태완; Reinoud Lavrijsen; 유천열; Henk J. M. Swagten; 정명화; Mathias Klaui
- Dzyaloshinskii？Moriya interaction; Exchange interaction; Chirality
- Issue Date
- Nature materials
- VOL 18-708
- 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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