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.
@article{arxiv.2211.05711,
title = {Skyrmion automotion in confined counter-sensor device geometries},
author = {Kilian Leutner and Thomas Brian Winkler and Johannes Güttinger and Hans Fangohr and Mathias Kläui},
journal= {arXiv preprint arXiv:2211.05711},
year = {2024}
}