Exchange-biasing topological charges by antiferromagnetism

Qing Lin He (), Gen Yin, Alexander J. Grutter, Lei Pan, Xiaoyu Che, Guoqiang Yu, Dustin A. Gilbert, Steven M. Disseler, Yizhou Liu, Padraic Shafer, Bin Zhang, Yingying Wu, Brian J. Kirby, Elke Arenholz, Roger K. Lake, Xiaodong Han and Kang L. Wang ()
Additional contact information
Qing Lin He: University of California
Gen Yin: University of California
Alexander J. Grutter: National Institute of Standards and Technology
Lei Pan: University of California
Xiaoyu Che: University of California
Guoqiang Yu: University of California
Dustin A. Gilbert: National Institute of Standards and Technology
Steven M. Disseler: National Institute of Standards and Technology
Yizhou Liu: University of California
Padraic Shafer: Lawrence Berkeley National Laboratory
Bin Zhang: Beijing University of Technology
Yingying Wu: University of California
Brian J. Kirby: National Institute of Standards and Technology
Elke Arenholz: Lawrence Berkeley National Laboratory
Roger K. Lake: University of California
Xiaodong Han: Beijing University of Technology
Kang L. Wang: University of California

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Geometric Hall effect is induced by the emergent gauge field experienced by the carriers adiabatically passing through certain real-space topological spin textures, which is a probe to non-trivial spin textures, such as magnetic skyrmions. We report experimental indications of spin-texture topological charges induced in heterostructures of a topological insulator (Bi,Sb)2Te3 coupled to an antiferromagnet MnTe. Through a seeding effect, the pinned spins at the interface leads to a tunable modification of the averaged real-space topological charge. This effect experimentally manifests as a modification of the field-dependent geometric Hall effect when the system is field-cooled along different directions. This heterostructure represents a platform for manipulating magnetic topological transitions using antiferromagnetic order.

Date: 2018
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DOI: 10.1038/s41467-018-05166-9

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