Berlin 2024 – wissenschaftliches Programm
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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 Hasegawa1 — 1Department 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)).