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We report strong interfacial exchange coupling in Bi2Se3/yttrium iron garnet(YIG) bilayers manifested as large in-plane interfacial magnetic anisotropy(IMA) and enhancement of damping probed by ferromagnetic resonance (FMR). TheIMA and spin mixing conductance reached a maximum when Bi2Se3 was around 6quintuple-layer (QL) thick. The unconventional Bi2Se3 thickness dependence ofthe IMA and spin mixing conductance are correlated with the evolution ofsurface band structure of Bi2Se3, indicating that topological surface statesplay an important role in the magnetization dynamics of YIG.Temperature-dependent FMR of Bi2Se3/YIG revealed signatures of magneticproximity effect of $T_c$ as high as 180 K, and an effective field parallel tothe YIG magnetization direction at low temperature. Our study sheds light onthe effects of topological insulators on magnetization dynamics, essential fordevelopment of TI-based spintronic devices.

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/YIG heterostructures