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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 (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. 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:
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
OSTI Identifier:
1179745
Alternate Identifier(s):
OSTI ID: 1226062