Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi₂Se₃/yttrium iron garnet heterostructures.

ABSTRACT: Harnessing the spin-momentum locking of topological surface states in conjunction with magnetic materials is the first step to realize novel topological insulator-based devices. Here, we report strong interfacial coupling in Bi₂Se₃/yttrium iron garnet (YIG) bilayers manifested as large interfacial in-plane magnetic anisotropy (IMA) and enhancement of damping probed by ferromagnetic resonance. The interfacial IMA and damping enhancement reaches a maximum when the Bi₂Se₃ film approaches its two-dimensional limit, indicating that topological surface states play an important role in the magnetization dynamics of YIG. Temperature-dependent ferromagnetic resonance of Bi₂Se₃/YIG reveals signatures of the magnetic proximity effect o

SUBMITTER: Fanchiang YT 

PROVIDER: S-EPMC5768741 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature