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Intermixing-Driven Surface and Bulk Ferromagnetism in the Quantum Anomalous Hall Candidate MnBi6 Te10
Abdul-Vakhab Tcakaev1,2, Bastian Rubrecht3, Jorge I Facio3,4
1Physikalisches Institut (EP-IV), Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 21, 2023
Summary
Robust ferromagnetism in MnBi6Te10, achieved through Mn/Bi intermixing, advances the quantum anomalous Hall effect (QAHE). This material exhibits stable magnetic properties at its surface, paving the way for improved QAHE devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- The (MnBi2Te4)(Bi2Te3)n family shows promise for the quantum anomalous Hall effect (QAHE).
- Antiferromagnetic coupling in MnBi2Te4 and MnBi4Te7 complicates QAHE realization.
- Stabilizing ferromagnetic (FM) states requires understanding the role of Bi2Te3 interlayers.
Purpose of the Study:
- Investigate the mechanisms driving ferromagnetism in the (MnBi2Te4)(Bi2Te3)n system.
- Determine the optimal number of Bi2Te3 quintuple layers (QLs) for stabilizing FM order.
- Characterize the surface magnetism and its relation to bulk properties.
Main Methods:
- Combined experimental and theoretical study of MnBi6Te10 (n=2).
- Magnetic property measurements, including Curie temperature (Tc).
- Surface-sensitive magnetic characterization techniques.
Main Results:
- Demonstrated robust FM properties in MnBi6Te10 with Tc ≈ 12 K.
- Established Mn/Bi intermixing as the origin of the FM state.
- Revealed a magnetically intact surface with bulk-like FM properties and a large magnetic moment.
Conclusions:
- MnBi6Te10 consolidates as a promising material for QAHE at higher temperatures.
- Understanding Mn/Bi intermixing is key to tuning magnetic properties in this family.
- The magnetically intact surface suggests potential for robust topological quantum effects.
Keywords:
X-ray absorption spectroscopy (XAS)X-ray magnetic circular dichroism (XMCD)intrinsic magnetic topological insulatormagnetic topological insulatormagnetismsuperconducting quantum interference device (SQUID)topological insulatorMore Related Videos
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