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Fanchiang, Y. T.; Chen, K. H. M.; Tseng, C. C.; Chen, C. C.; Cheng, C. K.; Yang, S. R.; Wu, C. N.; Lee, S. F.; Hong, M.; Kwo, J.
Nature communications, 01/2018, Letnik: 9, Številka: 1Journal Article
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 Bi 2 Se 3 /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 Bi 2 Se 3 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 Bi 2 Se 3 /YIG reveals signatures of the magnetic proximity effect of T C as high as 180 K, an emerging low-temperature perpendicular magnetic anisotropy competing the high-temperature IMA, and an increasing exchange effective field of YIG steadily increasing toward low temperature. Our study sheds light on the effects of topological insulators on magnetization dynamics, essential for the development of topological insulator-based spintronic devices.
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