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HL: Fachverband Halbleiterphysik

HL 40: 2D Materials and Heterostructures: Magnetic Properties

HL 40.12: Vortrag

Donnerstag, 21. März 2024, 12:45–13:00, EW 201

Electrical Observation of Skyrmions in the Sandwich Structure Incorporating Intrinsic Ferromagnetic Topological Insulators — •Takuya Takashiro1, Ryota Akiyama1, Ivan Kibirev2, Andrey Matetskiy2, Ryosuke Nakanishi1, Shunsuke Sato1, Takuro Fukasawa3, Taisuke Sasaki4, Haruko Toyama1, Kota Hiwatari1, Andrey Zotov2, Alexander Saranin2, Toru Hirahara3, and Shuji Hasegawa11Department of Physics, The University of Tokyo, Tokyo, Japan — 2Vladivostok, Russia — 3Department of Physics, Tokyo Institute of Technology, Tokyo, Japan — 4National Institute for Materials Science, Tsukuba, Japan

A topological insulator (TI) with ferromagnetism exhibits an energy gap at the Dirac point of the topological surface state (TSS), which provides a stage for interesting phenomena such as the quantum anomalous Hall effect and magnetic vortices, skyrmions. In particular, an intrinsic ferromagnetic TI, Mn(Bi,Sb)2Te4, has been actively studied because of a regularly arranged Mn-monolayer which induces ferromagnetism hybridizing with the TSS. In this study, we electrically observed skyrmions emerging in Mn(Bi,Sb)2Te4 layers in a sandwich structure of Mn(Bi,Sb)2Te4/(Bi,Sb)2Te3/Mn(Bi,Sb)2Te4 and found that skyrmions were stabilized by TSSs by tuning the Fermi level and the (Bi,Sb)2Te3-thickness. Intriguingly, the highly-ordered Mn monolayers make the skyrmions "soft-magnetic", which is promising for such as rewritable skyrmion memory (T. Takashiro, et al. Nano Lett. 22, 881 (2022)).

Keywords: Topological insulator; Ferromagnetism; Dirac surface state; Skyrmion; Topological Hall effect

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