The intersection of topology and magnetism represents a new playground to discover novel quantum phenomena and device concepts. In this work, we show that a van der Waals compound MnSb1.8Bi0.2Te4 exhibits a ferromagnetic ground state with a Curie temperature of 26 K, in contrast to the antiferromagnetic order previously found for other members of the Mn(Sb, Bi)2Te4 family. We employ magneto-transport, bulk magnetization and neutron scattering studies to illustrate the magnetic and electrical properties of MnSb1.8Bi0.2Te4 and report on the observation of an unusual anomalous Hall effect. Our results are an important step in the synthesis and understanding of ferromagnetic topological insulators.
@article{arxiv.1910.13057,
title = {Ferromagnetic van der Waals compound MnSb$_{1.8}$Bi$_{0.2}$Te$_4$},
author = {Yangyang Chen and Ya-Wen Chuang and Seng Huat Lee and Yanglin Zhu and Kevin Honz and Yingdong Guan and Yu Wang and Ke Wang and Zhiqiang Mao and Colin Heikes and P. Quarterman and Pawel Zajdel and Julie A. Borchers and William Ratcliff and Jun Zhu},
journal= {arXiv preprint arXiv:1910.13057},
year = {2020}
}