Magnetic skyrmions are compact chiral spin textures that exhibit a rich variety of topological phenomena and hold potential for developing high-density memory devices and novel computing schemes driven by spin currents. Here, we demonstrate room temperature interfacial stabilization and current-driven control of skyrmion bubbles in the ferrimagnetic insulator Tm3Fe5O12 (TmIG) coupled to Pt. We track the current-induced motion of individual skyrmion bubbles. The ferrimagnetic order of the crystal together with the interplay of spin-orbit torques and pinning determine the skyrmion dynamics in TmIG and result in a strong skyrmion Hall effect characterized by a negative deflection angle and hopping motion. Further, we show that the velocity and depinning threshold of the skyrmion bubbles can be modified by exchange coupling TmIG to an in-plane magnetized Y3Fe5O12 layer, which distorts the spin texture of the skyrmions and leads to a directional-dependent rectification of their dynamics. This effect, which is equivalent to a magnetic ratchet, is exploited to control the skyrmion flow in a racetrack-like device.
@article{arxiv.2301.08183,
title = {Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator},
author = {Saül Vélez and Sandra Ruiz-Gómez and Jakob Schaab and Elzbieta Gradauskaite and Martin S. Wörnle and Pol Welter and Benjamin J. Jacot and Christian L. Degen and Morgan Trassin and Manfred Fiebig and Pietro Gambardella},
journal= {arXiv preprint arXiv:2301.08183},
year = {2023}
}
Comments
52 pages, 24 figures (manuscript, extended data and supplementary information)