Long-range chiral exchange interaction in synthetic antiferromagnets

Dong-Soo Han, Kyujoon Lee, Jan-Philipp Hanke, Yuriy Mokrousov, Kyoung-Whan Kim, Woosuk Yoo, Youri L.W. van Hees, Tae-Wan Kim, Reinoud Lavrijsen, Chun-Yeol You, Henk J.M. Swagten, Myung-Hwa Jung (Corresponding author), Mathias Kläui (Corresponding author)

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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.

Original languageEnglish
Pages (from-to)703-708
Number of pages6
JournalNature Materials
Volume18
Issue number7
DOIs
Publication statusPublished - 1 Jul 2019

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Exchange interactions
Magnetic structure
Antiferromagnetism
Flavors
Ferromagnetism
Magnetism
interactions
Hysteresis loops
Magnetization
Multilayers
Orbits
Textures
Engineers
antiferromagnetism
ferromagnetism
engineers
interlayers
textures
hysteresis
alignment

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Han, D-S., Lee, K., Hanke, J-P., Mokrousov, Y., Kim, K-W., Yoo, W., ... Kläui, M. (2019). Long-range chiral exchange interaction in synthetic antiferromagnets. Nature Materials, 18(7), 703-708. https://doi.org/10.1038/s41563-019-0370-z
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 ; Kläui, Mathias. / Long-range chiral exchange interaction in synthetic antiferromagnets. In: Nature Materials. 2019 ; Vol. 18, No. 7. pp. 703-708.
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Han, D-S, Lee, K, Hanke, J-P, Mokrousov, Y, Kim, K-W, Yoo, W, van Hees, YLW, Kim, T-W, Lavrijsen, R, You, C-Y, Swagten, HJM, Jung, M-H & Kläui, M 2019, 'Long-range chiral exchange interaction in synthetic antiferromagnets', Nature Materials, vol. 18, no. 7, pp. 703-708. https://doi.org/10.1038/s41563-019-0370-z

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 (Corresponding author); Kläui, Mathias (Corresponding author).

In: Nature Materials, Vol. 18, No. 7, 01.07.2019, p. 703-708.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Kim, Tae-Wan

AU - Lavrijsen, Reinoud

AU - You, Chun-Yeol

AU - Swagten, Henk J.M.

AU - Jung, Myung-Hwa

AU - Kläui, Mathias

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AB - 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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Han D-S, Lee K, Hanke J-P, Mokrousov Y, Kim K-W, Yoo W et al. Long-range chiral exchange interaction in synthetic antiferromagnets. Nature Materials. 2019 Jul 1;18(7):703-708. https://doi.org/10.1038/s41563-019-0370-z