Exchange coupling and magnetic proximity effect probed by ferromagnetic resonance in topological insulator/ferromagnet bilayers (Conference Presentation)

Shang-Fan Lee; Y. T. Fanchiang; Minghwei Hong; J. Kwo

doi:10.1117/12.2320929

18 September 2018 Exchange coupling and magnetic proximity effect probed by ferromagnetic resonance in topological insulator/ferromagnet bilayers (Conference Presentation)

Shang-Fan Lee, Y. T. Fanchiang, Minghwei Hong, J. Kwo

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107320L (2018) https://doi.org/10.1117/12.2320929
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

The electrons’ spin-momentum locking of the topological surface states is an intriguing property in the development of spintronics. We investigate the topological insulators in conjunction with magnetic materials to study the static and dynamic magnetic properties. When the ferromagnetic layer is metallic NiFe, there is an effective magnetic field in the ferromagnetic resonance measurements at low temperatures. We attribute these extra fields to the exchange coupling to the surface states. When ferrimagnetic insulator yttrium iron garnet (YIG) replaces NiFe, we see evidence of strong interfacial coupling manifested as large interfacial anisotropy. Magnetic proximity effect are observed from magnetoresistance and temperature-dependent ferromagnetic resonance measurements. Our results show that the topological insulators can play an essential role for the development of spintronic devices.

Conference Presentation

Citation Download Citation

Shang-Fan Lee, Y. T. Fanchiang, Minghwei Hong, and J. Kwo "Exchange coupling and magnetic proximity effect probed by ferromagnetic resonance in topological insulator/ferromagnet bilayers (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107320L (18 September 2018); https://doi.org/10.1117/12.2320929

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