Magnetic skyrmionium can be used as a nanometer-scale non-volatile information carrier, which shows no skyrmion Hall effect due to its special structure carrying zero topological charge. Here, we report the static and dynamic properties of an isolated nanoscale skyrmionium in a frustrated magnetic monolayer, where the skyrmionium is stabilized by competing interactions. The frustrated skyrmionium has a size of about 10 nm, which can be further reduced by tuning perpendicular magnetic anisotropy or magnetic field. It is found that the nanoscale skyrmionium driven by the damping-like spin-orbit torque shows directional motion with a favored Bloch-type helicity. A small driving current or magnetic field can lead to the transformation of an unstable N\'eel-type skyrmionium to a metastable Bloch-type skyrmionium. A large driving current may result in the distortion and collapse of the Bloch-type skyrmionium. Our results are useful for the understanding of frustrated skyrmionium physics, which also provide guidelines for the design of spintronic devices based on topological spin textures.
@article{arxiv.2005.01403,
title = {Current-driven skyrmionium in a frustrated magnetic system},
author = {Jing Xia and Xichao Zhang and Motohiko Ezawa and Oleg A. Tretiakov and Zhipeng Hou and Wenhong Wang and Guoping Zhao and Xiaoxi Liu and Hung T. Diep and Yan Zhou},
journal= {arXiv preprint arXiv:2005.01403},
year = {2020}
}