Intermixing-driven surface and bulk ferromagnetism in the quantum anomalous Hall candidate MnBi$_6$Te$_{10}
The recent realizations of the quantum anomalous Hall effect (QAHE) in MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ benchmark the (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_n$ family as a promising hotbed for further QAHE improvements. The family owes its potential to its ferromagnetically (FM) ordered MnBi$_2$Te$_4$ sep...
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Zusammenfassung: | The recent realizations of the quantum anomalous Hall effect (QAHE) in
MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ benchmark the
(MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_n$ family as a promising hotbed for further
QAHE improvements. The family owes its potential to its ferromagnetically (FM)
ordered MnBi$_2$Te$_4$ septuple layers (SL). However, the QAHE realization is
complicated in MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ due to the substantial
antiferromagnetic (AFM) coupling between the SL. An FM state, advantageous for
the QAHE, can be stabilized by interlacing the SL with an increasing number $n$
of Bi$_2$Te$_3$ layers. However, the mechanisms driving the FM state and the
number of necessary QLs are not understood, and the surface magnetism remains
obscure. Here, we demonstrate robust FM properties in MnBi$_6$Te$_{10}$ ($n =
2$) with $T_C \approx 12$ K and establish their origin in the Mn/Bi intermixing
phenomenon by a combined experimental and theoretical study. Our measurements
reveal a magnetically intact surface with a large magnetic moment, and with FM
properties similar to the bulk. Our investigation thus consolidates the
MnBi$_6$Te$_{10}$ system as perspective for the QAHE at elevated temperatures. |
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DOI: | 10.48550/arxiv.2302.01023 |