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Title: Visualizing ferromagnetic domains in magnetic topological insulators

We report a systematic study of ferromagnetic domains in both single-crystal and thin-film specimens of magnetic topological insulators Cr doped (Bi 0.1Sb 0.9) 2Te 3 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. As a result, these results suggest that thin films are more promising for visualization of chiral edge states.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Shanghai Jiao Tong Univ., Shanghai (China)
  4. Shanghai Jiao Tong Univ., Shanghai (China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Publication Date:
OSTI Identifier:
1179745
Report Number(s):
BNL-108528-2015-JA
Journal ID: ISSN 2166-532X; AMPADS; R&D Project: PO010; KC0201060
Grant/Contract Number:
SC00112704; SC0008147
Type:
Published Article
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic force microscopy; single crystals; domain walls; magnetic films; chiral symmetries