Topological Hall Effect in Traditional Ferromagnet Embedded with Black-Phosphorus-Like Bismuth Nanosheets

Liang Zhou, Junshu Chen, Xiaobin Chen, Bin Xi, Yang Qiu, Junwei Zhang, Linjing Wang, Runnan Zhang, Bicong Ye, Pingbo Chen, Xixiang Zhang, Guo-Ping Guo, Dapeng Yu, Jia-Wei Mei, Fei Ye, Gan Wang, Hongtao He

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4 Scopus citations

Abstract

Topological Hall effect is an abnormal Hall response arising from the scalar spin chirality of chiral magnetic textures. Up to now, such an effect is only observed in certain special materials, but rarely in traditional ferromagnets. In this work, we have implemented the molecular beam epitaxy technique to successfully embed black-phosphorus-like bismuth nanosheets with strong spin orbit coupling into the bulk of chromium telluride Cr2Te3, as evidenced by atomically resolved energy dispersive X-ray spectroscopy mapping. Distinctive from pristine Cr2Te3, these Bi-embedded Cr2Te3 epitaxial films exhibit not only pronounced topological Hall effects, but also magnetoresistivity anomalies and differential magnetic susceptibility plateaus. All these experimental features point to the possible emergence of magnetic skyrmions in Bi-embedded Cr2Te3, which is further supported by our numerical simulations with all input parameters obtained from the first-principle calculations. Therefore, our work demonstrates a new efficient way to induce skyrmions in ferromagnets, as well as the topological Hall effect by embedding nanosheets with strong spin-orbit couplings.
Original languageEnglish (US)
JournalACS Applied Materials & Interfaces
DOIs
StatePublished - Apr 27 2020

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