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arXiv · 2211.05711

Skyrmion automotion in confined counter-sensor device geometries

Kilian Leutner·Thomas Brian Winkler·Johannes Güttinger·Hans Fangohr·Mathias Kläui
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Abstract

Magnetic skyrmions are topologically stabilized quasi-particles and are promising candidates for energy-efficient applications, such as storage but also logic and sensing. Here we present a new concept for a multi-turn sensor-counter device based on skyrmions, where the number of sensed rotations is encoded in the number of nucleated skyrmions. The skyrmion-boundary force in the confined geometry of the device in combination with the topology-dependent dynamics leads to the effect of automotion for certain geometries. For our case, we describe and investigate this effect with micromagnetic simulations and the coarse-grained Thiele equation in a triangular geometry with an attached reservoir as part of the sensor-counter device.

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Kilian Leutner, Thomas Brian Winkler, Johannes Güttinger, Hans Fangohr, Mathias Kläui. 2022-11-10. Skyrmion automotion in confined counter-sensor device geometries. https://doi.org/10.1103/physrevapplied.20.064021

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