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

Vélez, Saül; Ruiz-Gómez, Sandra; Schaab, Jakob; Gradauskaite, Elzbieta; Wörnle, M. S.; Welter, Pol; Jacot, B. J.; Degen, Christian L.; Trassin, Morgan; Fiebig, Manfred; Gambardella, Pietro

doi:10.1038/s41565-022-01144-x

Cited by 58 publications

(48 citation statements)

References 58 publications

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“…4c and 4d. Thus, an additional state is visible and this irreversible behavior manifests a similar SOT ratchet effect in a single layer RE-TM ferrimagnetic alloy as in AFM/FM systems 35,37,41 . SOT switching curve with varying external symmetry breaking field (B x ) and initialization with B set,z of +100 mT and -100 mT respectively.…”

Section: Resultsmentioning

confidence: 75%

Tunable multistate field-free switching and ratchet effect by spin-orbit torque in canted ferrimagnetic alloy

Hsu

Gross

Kleidermacher

et al. 2023

Preprint

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Spin-orbit torque is not only a useful probe to study manipulation of magnetic textures and magnetic states at the nanoscale but also it carries great potential for next-generation computing applications. Here we report the observation of rich spin-orbit torque switching phenomena such as field-free switching, multistate switching, memristor behavior and ratchet effect in a single shot, co-sputtered, rare earth-transition metal GdxCo100−x. Notably such effects have only been observed in antiferromagnet/ferromagnet bi-layer systems previously. We show that these effects can be traced to a large anistropic canting, that can be engineered into the GdxCo100−x system. Further, we show that the magnitude of these switching phenomena can be tuned by the canting angle and the in-plane external field. The complex spin-orbit torque switching observed in canted GdxCo100−x not only provides a new platform for novel spintronics but also serves as a model system to study the underlying physics of complex magnetic textures and interactions.

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Section: Resultsmentioning

confidence: 75%

Tunable multistate field-free switching and ratchet effect by spin-orbit torque in canted ferrimagnetic alloy

Hsu

Gross

Kleidermacher

et al. 2023

Preprint

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“…By contrast, the SH wave can e ciently move skyrmions as a result of the strong magnetoelastic coupling induced by the in-plane strain gradients. The observed directional motion shows a longitudinal component along the wave propagation direction, and a transverse component with the sign depending on the topological charges, in analogy to the skyrmion Hall effect 12,43 . These experimental observations are further con rmed by our micromagnetic simulations.…”

mentioning

confidence: 76%

Acoustic-Driven Magnetic Skyrmion Motion

Yang

et al. 2023

Preprint

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Magnetic skyrmions have great potential for developing novel spintronic devices. The electrical manipulation of skyrmions has mainly relied on current-induced spin-orbit torques. A recent theoretical model suggested that the skyrmions could be more efficiently manipulated by surface acoustic waves (SAW), an elastic wave that can couple with magnetic moment through magnetoelastic effect. However, the directional motion of skyrmions that is driven by SAW is still missing. Here, we experimentally demonstrate the motion of Néel-type skyrmions in Ta/CoFeB/MgO/Tamultilayers driven by propagating SAW pulses from on-chip piezoelectric transducers. Our results revealthat the elastic wave with longitudinal and shear vertical displacements (Rayleigh wave) traps skyrmions, while the shear horizontal wave effectively drives the motion of skyrmions. In particular, a longitudinal motion along the SAW propagation direction and a transverse motion due to topological charge, are observed and further confirmed by our micromagnetic simulations. This work demonstrates a promising approach based on acoustic waves for manipulating skyrmions, which could offer new opportunities for ultra-low power spintronics.

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“…Spin ratchet effects, which can open novel ways for efficient generation and control of spin fluxes [28], attracted growing attention. Since the first work, several different origins of spin ratchet currents have been suggested and discussed [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45], for review see [46]. For example, it has been shown that a stationary spin current can be generated by applying an ac driving current to a symmetric or asymmetric periodic structure with Rashba spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%