Efficient electrical manipulation of domain walls is key to developing magnetic devices with fast switching capabilities and low energy consumption. Here we demonstrate Bloch-type domain wall velocities exceeding 1 km s−1 in the single-layer ferrimagnetic spinel oxide NiCo2O4 induced by spin-transfer torque at a current density of 2×1011 A m−2. This exceptional domain wall mobility is attributed to the combination of giant nonadiabatic spin-transfer torque, low magnetization, and high spin polarization. Additionally, we report a pronounced domain wall inertia effect in this ferrimagnet due to the large nonadiabaticity of the torque. The characteristic time for domain wall acceleration and deceleration is ∼1 ns, shorter than that reported for typical ferromagnets. Our findings highlight the potential of spinel oxides as a promising platform for engineering high-performance domain wall devices that take advantage of ultrafast ferrimagnetic dynamics.
@article{arxiv.2605.27216,
title = {High-mobility inertial domain walls driven by spin-transfer torque in a ferrimagnetic spinel oxide},
author = {Mingxing Wu and Shilei Ding and Laura van Schie and Shenghao Cai and Yuhao Qiu and Ao Du and Alexander E. Kossak and Rui Wu and Christian L. Degen and Xuegang Chen and Pietro Gambardella},
journal= {arXiv preprint arXiv:2605.27216},
year = {2026}
}