Phase Locking of a Pair of Ferromagnetic Nano-oscillators on a Topological Insulator

Cheng Zhen Wang, Hong Ya Xu, Nicholas D. Rizzo, Richard Kiehl, Ying-Cheng Lai

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We investigate the magnetization dynamics of a pair of ferromagnetic insulators (FMIs) deposited on the surface of a topological insulator (TI). Because of the nonlinear nature of the underlying physics and intrinsic dynamics, the FMIs can exhibit oscillatory behaviors even under a constant applied voltage. The motion of the surface electrons of the TI, which obeys relativistic quantum mechanics, provides a mechanism of direct coupling between the FMIs. In particular, the spin-polarized current of the TI surface electrons can affect the magnetization of the two FMIs, which in turn modulates the electron transport, giving rise to a hybrid relativistic quantum and classical nonlinear dynamical system. We find robust phase and antiphase locking between the magnetization dynamics. As driving the surface electrons of a TI requires only extremely low power, our finding suggests that nanoscale FMIs coupled by a spin-polarized current on the surface of a TI have the potential to serve as the fundamental building blocks of unconventional, low-power computing paradigms.

Original languageEnglish (US)
Article number064003
JournalPhysical Review Applied
Issue number6
StatePublished - Dec 3 2018

ASJC Scopus subject areas

  • General Physics and Astronomy


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