Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Skyrmions III
MA 37.12: Talk
Thursday, March 21, 2024, 12:30–12:45, EB 301
Simulation of a realistic skyrmion-based multiturn counter-sensor device at finite temperatures — •Kilian Leutner1, Thomas Brian Winkler1, Robert Frömter1, Raphael Gruber1, Johannes Güttinger2, Hans Fangohr3, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 2Infineon Technologies AG, Villach, Austria — 3Max-Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany
Magnetic skyrmions, as topologically stabilized quasi particles, hold great promise for energy-efficient applications encompassing storage, logic, and sensing devices.
In this work, we introduce an innovative, realistic, and feasible concept for a multi-turn counter-sensor device utilizing skyrmions, a step towards applied skyrmionics. In the sensor the encoded number of sensed rotations corresponds to the number of nucleated skyrmions [1]. The sensor only consumes energy at the readout. Our simulation study reveals a robust design and protocol for reading out a skyrmion storage, facilitating accurate quantification of skyrmion numbers, even in the presence of thermal fluctuations and thermal diffusion. Emphasizing the fundamental principles underlying reliable and realistic readout mechanisms, our findings extend applicability to a broader class of skyrmion-based devices. Additionally, we provide insights into the detection of skyrmions through their strayfield via magnetic tunnel junctions (MTJ).
[1] K. Leutner, et al., Phys. Rev. Appl., accepted (2023),
[1] arXiv:2211.05711 (2022)
Keywords: Applied Skyrmionics; Skyrmions; Sensor; Micromagnetic simulation; Spintronics