Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting

Three-dimensional (3D) compensated MnBi 2 Te 4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi 2 Te 4 originates from a topological resp...

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Bibliographic Details
Published in:npj quantum materials 2022-04, Vol.7 (1), p.1-7, Article 46
Main Authors: Bac, S.-K., Koller, K., Lux, F., Wang, J., Riney, L., Borisiak, K., Powers, W., Zhukovskyi, M., Orlova, T., Dobrowolska, M., Furdyna, J. K., Dilley, N. R., Rokhinson, L. P., Mokrousov, Y., McQueeney, R. J., Heinonen, O., Liu, X., Assaf, B. A.
Format: Article
Language:English
Subjects:
639/301/119/2792/4128
639/766/119/2792/4128
639/766/119/2793
639/766/119/997
Antiferromagnetism
Chemical synthesis
Condensed Matter Physics
Electromagnetism
Evolution
Ferromagnetism
Filing
Hall effect
Magnetic moments
Magnetism
Molecular beam epitaxy
Phase diagrams
Physics
Physics and Astronomy
Quantum Physics
Saturation
Structural Materials
Surfaces and Interfaces
Thin Films
Topology
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Summary:Three-dimensional (3D) compensated MnBi 2 Te 4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi 2 Te 4 originates from a topological response that is sensitive to the perpendicular magnetic moment and to its canting angle. Synthesis by molecular beam epitaxy allows us to obtain a large-area quasi-3D 24-layer MnBi 2 Te 4 with near-perfect compensation that hosts the phase diagram observed in bulk which we utilize to probe the AHE. This AHE is seen to exhibit an antiferromagnetic response at low magnetic fields, and a clear evolution at intermediate fields through surface and bulk spin-flop transitions into saturation. Throughout this evolution, the AHE is super-linear versus magnetization rather than the expected linear relationship. We reveal that this discrepancy is related to the canting angle, consistent with the symmetry of the crystal. Our findings bring to light a topological anomalous Hall response that can be found in non-collinear ferromagnetic, and antiferromagnetic phases.
ISSN:2397-4648
2397-4648
DOI:10.1038/s41535-022-00455-5