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Proceedings Paper

Exchange coupling and magnetic proximity effect probed by ferromagnetic resonance in topological insulator/ferromagnet bilayers (Conference Presentation)
Author(s): Shang-Fan Lee; Y. T. Fanchiang; Minghwei Hong; J. Kwo
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Paper 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.

Paper Details

Date Published: 18 September 2018
Proc. SPIE 10732, Spintronics XI, 107320L (18 September 2018); doi: 10.1117/12.2320929
Show Author Affiliations
Shang-Fan Lee, Academia Sinica (Taiwan)
Y. T. Fanchiang, National Taiwan Univ. (Taiwan)
Minghwei Hong, National Taiwan Univ. (Taiwan)
J. Kwo, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 10732:
Spintronics XI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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