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Exchange-biasing topological charges by antiferromagnetism #MMPMID30018306
He QL; Yin G; Grutter AJ; Pan L; Che X; Yu G; Gilbert DA; Disseler SM; Liu Y; Shafer P; Zhang B; Wu Y; Kirby BJ; Arenholz E; Lake RK; Han X; Wang KL
Nat Commun 2018[]; 9 (ä): ä PMID30018306show ga
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.