Magnetic Imaging of Domain Walls in the Antiferromagnetic Topological Insulator MnBi2Te4
- Rutgers Univ., Piscataway, NJ (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- New Jersey Inst. of Technology, Newark, NJ (United States)
The control of domain walls or spin textures is crucial for spintronic applications of antiferromagnets. Despite many efforts, it has been challenging to directly visualize antiferromagnetic domains or domain walls with nanoscale resolution, especially in magnetic field. Here, we report magnetic imaging of domain walls in several uniaxial antiferromagnets, the topological insulator MnBi2Te4 family, using cryogenic magnetic force microscopy (MFM). Our MFM results reveal higher magnetic susceptibility inside the domain walls than in domains. Domain walls in these antiferromagnets form randomly with strong thermal and magnetic field dependence. The direct visualization of these domain walls and domain structures in the magnetic field will not only facilitate the exploration of intrinsic topological phenomena in antiferromagnetic topological insulators but will also open a new path toward control and manipulation of domain walls or spin textures in functional antiferromagnets.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rutgers Univ., Piscataway, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC05-00OR22725; SC0018153
- OSTI ID:
- 1608193
- Alternate ID(s):
- OSTI ID: 1638232
- Journal Information:
- Nano Letters, Vol. 20, Issue 4; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
domain walls
antiferromagnetic topological insulator
magnetic force microscopy
spin-flop transition
crystal structure
magnetic properties
energy
quantum mechanics
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Domain walls
Antiferromagnetic topological insulator
magnetic force microscopy
spin-flop transition