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arXiv · 2301.08183

Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator

Saül Vélez·Sandra Ruiz-Gómez·Jakob Schaab·Elzbieta Gradauskaite·Martin S. Wörnle·Pol Welter·Benjamin J. Jacot·Christian L. Degen·Morgan Trassin·Manfred Fiebig·Pietro Gambardella
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Abstract

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.

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Saül Vélez, Sandra Ruiz-Gómez, Jakob Schaab, Elzbieta Gradauskaite, Martin S. Wörnle, Pol Welter, Benjamin J. Jacot, Christian L. Degen, Morgan Trassin, Manfred Fiebig, Pietro Gambardella. 2023-01-19. Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator. https://doi.org/10.1038/s41565-022-01144-x

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