Natural van der Waals heterostructural single crystals with both magnetic and topological properties.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31763457.
- Also identified by DOI 10.1126/sciadv.aax9989 and PMC identifier 6858254.
- Licence recorded as CC BY-NC.
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Abstract
Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering. Here, we report natural magnetic van der Waals heterostructures of (MnBi<sub>2</sub>Te<sub>4</sub>) <i><sub>m</sub></i> (Bi<sub>2</sub>Te<sub>3</sub>) <i><sub>n</sub></i> that exhibit controllable magnetic properties while maintaining their topological surface states. The interlayer antiferromagnetic exchange coupling is gradually weakened as the separation of magnetic layers increases, and an anomalous Hall effect that is well coupled with magnetization and shows ferromagnetic hysteresis was observed below 5 K. The obtained homogeneous heterostructure with atomically sharp interface and intrinsic magnetic properties will be an ideal platform for studying the quantum anomalous Hall effect, axion insulator states, and the topological magnetoelectric effect.