Ultrafast optical control of surface and bulk magnetism in magnetic topological insulator/antiferromagnet heterostructure.

ABSTRACT: Optical control of the magnetic properties in topological insulator systems is an important step in applying these materials in ultrafast optoelectronic and spintronic schemes. In this work, we report the experimental observation of photo-induced magnetization dynamics in the magnetically doped topological insulator (MTI)/antiferromagnet (AFM) heterostructure composed of Cr-(Bi,Sb)₂Te₃/CrSb. Through proximity coupling to the AFM layer, the MTI displays a dramatically enhanced magnetism, with robust perpendicular magnetic anisotropy. When subjected to intense laser irradiation, both surface and bulk magnetism of the MTI are weakened by laser-induced heating of the lattice, however, at the surface, the deleterious heat effect is compensated by the strengthening of Dirac

SUBMITTER: Liu P 

PROVIDER: S-EPMC9287552 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature