Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet
The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quantized anomalous Hall conductance can, in principle, be observed. Here we present experiments on microfabricated devices based on , a layered AFM that was recently found to exhibit AHE in bulk crystals below the Néel temperature K. Transport measurements reveal a pronounced resistivity anisotropy, indicating that upon lowering temperature the electronic coupling between individual atomic layers is increasingly suppressed. The experiments also show an extremely large anomalous Hall conductivity of approximately 400 S/cm, more than one order of magnitude larger than in the bulk, which demonstrates the importance of studying the AHE in small exfoliated crystals, less affected by crystalline defects. Interestingly, the corresponding anomalous Hall conductance, when normalized to the number of contributing atomic planes, is per layer, approaching the value expected for the quantized anomalous Hall effect. The observed strong anisotropy of transport and the very large anomalous Hall conductance per layer make the properties of compatible with the presence of partially filled topologically nontrivial 2D bands originating from the magnetic superstructure of the antiferromagnetic state. Isolating atomically thin layers of this material and controlling their charge density may therefore provide a viable route to reveal the occurrence of the quantized AHE in a 2D AFM.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF)
- Grant/Contract Number:
- AC02-06CH11357; 200021-175836
- OSTI ID:
- 1615163
- Alternate ID(s):
- OSTI ID: 1616278
- Journal Information:
- Physical Review Research, Journal Name: Physical Review Research Vol. 2 Journal Issue: 2; ISSN 2643-1564
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
Anomalous Hall effect
antiferromagnetism
magnetic domains
magnetization switching
magnetotransport
quantum anomalous Hall effect
spin texture
antiferromagnets
noncollinear magnets
transition-metal dichalcogenide
focused ion beam
Hall bar
lithography
neutron diffraction
resistivity measurements
transport tecniques