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Published on: April 20, 2015
Exchange-biasing topological charges by antiferromagnetism
Qing Lin He1,2, Gen Yin3, Alexander J Grutter4
1Department of Electrical and Computer Engineering, Department of Physics and Astronomy, Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA. qlhe@pku.edu.cn.
Researchers observed tunable spin-texture topological charges in topological insulator/antiferromagnet heterostructures. This geometric Hall effect modification offers a new platform for exploring magnetic topological transitions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Geometric Hall effect probes topological spin textures like magnetic skyrmions.
- Topological insulators (TIs) and antiferromagnets (AFMs) are key materials in spintronics.
- Controlling spin textures at interfaces is crucial for novel electronic devices.
Purpose of the Study:
- To experimentally investigate spin-texture topological charges in TI/AFM heterostructures.
- To explore the influence of interfacial pinned spins on topological charge.
- To demonstrate a tunable geometric Hall effect based on antiferromagnetic order.
Main Methods:
- Fabrication of (Bi,Sb)2Te3/MnTe heterostructures.
- Field-cooling protocols along different directions.
- Measurement of field-dependent geometric Hall effect.
Main Results:
- Experimental indications of induced spin-texture topological charges.
- Tunable modification of averaged real-space topological charge via interfacial spins.
- Field-cooling dependent changes in geometric Hall effect observed.
Conclusions:
- The (Bi,Sb)2Te3/MnTe heterostructure serves as a platform for manipulating magnetic topological transitions.
- Interfacial spin effects enable control over topological charges.
- Antiferromagnetic order can be used to tune topological properties.
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