Selective Activation of an Isolated Magnetic Skyrmion in a Ferromagnet with Microwave Electric Fields

TL;DR

This paper demonstrates that microwave electric fields can selectively activate specific eigenmodes of an isolated magnetic skyrmion, enabling efficient control and faster translational motion in ferromagnetic nanotracks without large ferromagnetic resonances.

Contribution

It introduces a method to selectively excite skyrmion eigenmodes using microwave electric fields, avoiding large ferromagnetic resonances and enhancing skyrmion motion control.

Findings

Selective activation of skyrmion eigenmodes with microwave electric fields.

Faster skyrmion propagation using combined breathing and rotational modes.

Efficient driving of skyrmion motion without large ferromagnetic resonances.

Abstract

We theoretically reveal that pure eigenmodes of an isolated magnetic skyrmion embedded in a ferromagnetic environment can be selectively activated using microwave electric fields without exciting gigantic ferromagnetic resonances, in contrast to conventional methods using microwave magnetic fields. We also demonstrate that this selective activation of a skyrmion can efficiently drive its translational motion in a ferromagnetic nanotrack under application of an external magnetic field inclined from the normal direction. We find that a mode with combined breathing and rotational oscillations induces much faster skyrmion propagation than the breathing mode studied previously by Wang et al. [Phys. Rev. B 92, 020403(R) (2015)].