Journal Article

FZJ-2019-03371

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Long-range chiral exchange interaction in synthetic antiferromagnets

Han, D.-S. ; Lee, K. ; Hanke, J.-P.FZJ* ; Mokrousov, Y.FZJ* ; Kim, K.-W. ; Yoo, W. ; van Hees, Y. L. W. ; Kim, T.-W. ; Lavrijsen, R. ; You, C.-Y. ; Swagten, H. J. M. ; Jung, M.-H. (Corresponding author) ; Kläui, M. (Corresponding author)

2019
Nature Publishing Group Basingstoke

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Please use a persistent id in citations: http://hdl.handle.net/2128/24860  doi:10.1038/s41563-019-0370-z

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.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. Topological transport in real materials from ab initio (jiff40_20090701) (jiff40_20090701)
3. Topological transport in real materials from ab initio (jara0062_20130501) (jara0062_20130501)

Appears in the scientific report 2019

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Database coverage:
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