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

被引：67

作者：

Fanchiang, Y. T. ^{[1
]}

Chen, K. H. M. ^{[2
]}

Tseng, C. C. ^{[2
]}

Chen, C. C. ^{[2
]}

Cheng, C. K. ^{[1
]}

Yang, S. R. ^{[2
]}

Wu, C. N. ^{[2
]}

Lee, S. F. ^{[3
]}

Hong, M. ^{[1
]}

Kwo, J. ^{[2
]}

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[2] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

关键词：

TUNABLE TOPOLOGICAL INSULATOR; PHASE-TRANSITION; PROXIMITY; INTERFACE; BI2SE3;

D O I：

10.1038/s41467-017-02743-2

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 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.

引用

页数：9

共 56 条

[1] Spin chemical potential bias induced surface current evidenced by spin pumping into the topological insulator Bi2Te3 [J].