講演情報
[20p-C501-14]A Noble-Metal-Free Spintronic System with Ferromagnetic Topological Surface State of FeSi above Room Temperature
〇Tomohiro Hori1,2, Naoya Kanazawa1, Motoaki Hirayama2,3, Kohei Fujiwara4, Atsushi Tsukazaki4, Masashi Kawasaki2,3, Yoshinori Tokura2,3,5 (1.IIS, Univ. of Tokyo, 2.Dept. of Appl. Phys., Univ. of Tokyo, 3.RIKEN CEMS, 4.IMR, Tohoku Univ., 5.Tokyo college, Univ. of Tokyo)
キーワード：
Spin-orbit torque、Magnetization switching、Topological surface state
A nonmagnetic insulator FeSi has been shown to host topological surface states constituting two-dimensional ferromagnetic metallic bands. The surface polarization charges with high density of states emerge, leading to strong Rashba-type spin-orbit coupling (SOC) as well as good electrical conduction and high ferromagnetic-ordering temperature (TC) especially without heavy element. Owing to the coexistence of ferromagnetism and strong SOC at the surface, the current-induced magnetization switching through Rashba-Edelstein effect and spin-orbit torque (SOT) has been realized with high efficiency. Here we report the experimental realization of room temperature magnetization switching by using the proximity effects from wide bandgap insulators. This success of room-temperature spin manipulation in noble-metal-free compounds will accelerate spintronic application such as SOT-MRAM.