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MA: Fachverband Magnetismus

MA 49: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism II

MA 49.7: Vortrag

Donnerstag, 19. März 2020, 16:45–17:00, HSZ 04

Long-range chiral exchange interaction in synthetic antiferromagnets — Dong-Soo Han¹, Kyujoon Lee¹, •Fabian Kammerbauer¹, Myung-Hwa Jung², and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg-Universität Mainz, Mainz, Germany — ²Department of Physics, Sogang University, Seoul, Republic of Korea

The exchange interaction underlies all spintronic devices. This interaction has two counterparts * the symmetric and antisymmetric part. The symmetric term governs the ferro- and antiferromagnetism where the antisymmetric which has recently gained interest since it promotes topologically non-trivial chiral spin textures that promise new magnetic devices . So far, the antisymmetric exchange interaction has only been demonstrated in the rather short range 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 [1]. The measured asymmetric hysteresis loops under an in-plane field reveal a unidirectional and chiral nature of this interaction, resulting 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. [1] D.Han et al., Nature Mater. 18, 905 (2019)