Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators

Masataka Mogi; Taro Nakajima; Victor Ukleev; Atsushi Tsukazaki; Ryutaro Yoshimi; Minoru Kawamura; Kei S Takahashi; Takayasu Hanashima; Kazuhisa Kakurai; Taka-hisa Arima; Masashi Kawasaki; Yoshinori Tokura

doi:10.1103/PhysRevLett.123.016804

Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators

Mesoscale and Nanoscale Physics 2019-07-04 v1 Materials Science

Authors: Masataka Mogi , Taro Nakajima , Victor Ukleev , Atsushi Tsukazaki , Ryutaro Yoshimi , Minoru Kawamura , Kei S Takahashi , Takayasu Hanashima , Kazuhisa Kakurai , Taka-hisa Arima , Masashi Kawasaki , Yoshinori Tokura

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Abstract

We report a proximity-driven large anomalous Hall effect in all-telluride heterostructures consisting of ferromagnetic insulator Cr2Ge2Te6 and topological insulator (Bi,Sb)2Te3. Despite small magnetization in the (Bi,Sb)2Te3 layer, the anomalous Hall conductivity reaches a large value of 0.2e2/h in accord with a ferromagnetic response of the Cr2Ge2Te6. The results show that the exchange coupling between the surface state of the topological insulator and the proximitized Cr2Ge2Te6 layer is effective and strong enough to open the sizable exchange gap in the surface state.

Keywords

anomalous hall effect topological insulator ferromagnetic insulator proximity effect cr2ge2te6 exchange coupling surface state

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@article{arxiv.1906.02159,
  title  = {Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators},
  author = {Masataka Mogi and Taro Nakajima and Victor Ukleev and Atsushi Tsukazaki and Ryutaro Yoshimi and Minoru Kawamura and Kei S Takahashi and Takayasu Hanashima and Kazuhisa Kakurai and Taka-hisa Arima and Masashi Kawasaki and Yoshinori Tokura},
  journal= {arXiv preprint arXiv:1906.02159},
  year   = {2019}
}

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33 pages, 12 figures including supplemental material, accepted by PRL

Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators

Abstract

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