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journal article·2015-08-01Open access

Visualizing ferromagnetic domains in magnetic topological insulators

Wenbo Wang, Fang Yang, Chunlei Gao, Jinfeng Jia, G. D. Gu, Weida Wu

APL Materials· Volume 3· Issue 8
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Source abstract

Abstract

We report a systematic study of ferromagnetic domains in both single-crystal and thin-film specimens of magnetic topological insulators Cr doped (Bi0.1Sb0.9)2Te3 using magnetic force microscopy (MFM). The temperature and field dependences of MFM and in situ resistance data are consistent with previous bulk transport and magnetic characterization. Bubble-like ferromagnetic domains were observed in both single crystals and thin films. Significantly, smaller domain size (∼500 nm) with narrower domain wall (∼150 − 300 nm) was observed in thin films of magnetic topological insulators, likely due to vertical confinement effect. These results suggest that thin films are more promising for visualization of chiral edge states.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Rutgers University 1 Department of Physics and Astronomy, , Piscataway, New Jersey 08854, USA

Shanghai Jiaotong University 2 Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, , 800 Dongchuan Road, Shanghai 200240, People’s Republic of China

Shanghai Jiao Tong University 3 Collaborative Innovation Center of Advanced Microstructures, Department of Physics and Astronomy, , Shanghai 200240, People’s Republic of China

Brookhaven National Laboratory 4 Condensed Matter Physics and Materials Science Department, , Upton, New York 11973, USA

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