Electromagnon on the Surface of Magnetic Topological Insulator

TL;DR

This paper theoretically studies electromagnons on magnetic topological insulator surfaces, revealing electric field-driven ferromagnetic resonance with high efficiency due to surface asymmetry.

Contribution

It introduces the concept of electric field-driven electromagnons on magnetic topological insulator surfaces and estimates their resonant frequencies.

Findings

Electric field can efficiently drive ferromagnetic resonance on the surface.

Magnetic asymmetry enhances electric field coupling.

Resonant frequencies of electromagnons are estimated.

Abstract

We investigate theoretically the electromagnon on the surfaces of the magnetic topological insulator thin films. It is found that when the magnetic asymmetry between the top and bottom surfaces is there, the ferromagnetic resonance is driven by the electric field which is two orders of magnitude more efficient compared with that by the magnetic field. The resonant frequency of the electromagnon is also estimated.