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Chiral domain walls of Mn3Sn and their memory

Xiaokang Li, Clément Collignon, Liangcai Xu, Huakun Zuo, Antonella Cavanna, Ulf Gennser, Dominique Mailly, Benoît Fauqué, Leon Balents, Zengwei Zhu () and Kamran Behnia ()
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Xiaokang Li: Huazhong University of Science and Technology
Clément Collignon: PSL Research University
Liangcai Xu: Huazhong University of Science and Technology
Huakun Zuo: Huazhong University of Science and Technology
Antonella Cavanna: Université Paris-Saclay
Ulf Gennser: Université Paris-Saclay
Dominique Mailly: Université Paris-Saclay
Benoît Fauqué: Collège de France
Leon Balents: University of California
Zengwei Zhu: Huazhong University of Science and Technology
Kamran Behnia: PSL Research University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Magnetic domain walls are topological solitons whose internal structure is set by competing energies which sculpt them. In common ferromagnets, domain walls are known to be of either Bloch or Néel types. Little is established in the case of Mn3Sn, a triangular antiferromagnet with a large room-temperature anomalous Hall effect, where domain nucleation is triggered by a well-defined threshold magnetic field. Here, we show that the domain walls of this system generate an additional contribution to the Hall conductivity tensor and a transverse magnetization. The former is an electric field lying in the same plane with the magnetic field and electric current and therefore a planar Hall effect. We demonstrate that in-plane rotation of spins inside the domain wall would explain both observations and the clockwise or anticlockwise chirality of the walls depends on the history of the field orientation and can be controlled.

Date: 2019
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DOI: 10.1038/s41467-019-10815-8

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