[25p-71B-1~13] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

1:00 PM - 1:30 PM JST(4:00 AM - 4:30 AM UTC)

[25p-71B-1] [The 8th Thin Film and Surface Physics Division Paper Award Speech] Chiral-spin-texture-induced skyrmions in a sandwich structure composed of ultrathin films of intrinsic ferromagnetic topological insulators

〇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, Shuji Hasegawa¹ (1.Univ. of Tokyo, 2.IACP, 3.Tokyo Tech, 4.NIMS)

Keywords:

Topological insulator,Ferromagnetism,Skyrmion

Among topological insulators (TIs) having ferromagnetism, an intrinsic ferromagnetic TI, Mn(Bi,Sb)₂Te₄ (MBST), has attracted much attention because it possesses the homogeneous ferromagnetic order hybridizing with the topological surface state. In this study, we designed a sandwich structure where two MBST blocks were separated by the nonmagnetic TI, (Bi,Sb)₂Te₃, and thereby observed magnetic skyrmions (Sk) for the first time in MBST systems. Interestingly, it was found that Sk properties reflected the MBST crystalline structure, which allowed Sk to be controlled by weak magnetic fields. Therefore, our results contribute to the application of an easilly rewritable Sk memory.