Year: 2025
Type: article
Abstract: Magnetic skyrmions, topologically stabilized spin textures, are promising candidates for future memory devices and non-conventional computing applications due to their enhanced stability, nonlinear interactions, and low-power manipulation capabilities. Despite their significant potential, the reliable electrical readout of individual skyrmions remains a fundamental challenge. While magnetic tunnel junctions and anomalous Hall effect (AHE)-based techniques have demonstrated skyrmion detection capabilities, they currently fail to reliably detect single, moving skyrmions, as required for applications. Our approach leverages thermally activated skyrmions, where a low constant drive current simultaneously generates both skyrmion motion and the Hall voltage necessary for detection. We demonstrate the reliability of this method through real-time correlations between measured Hall voltage signals and direct Kerr microscopy imaging. Two consecutive Hall crosses allow for determining the skyrmion velocity, in accordance with Kerr microscopy videos. We present an analytical formula for the skyrmion AHE readout signal, demonstrating scalability from micrometer- to nanometer-sized skyrmions. These advances establish a robust platform for skyrmion-based sensors, counters, and unconventional computing systems that depend on precise individual skyrmion control and detection.
Source: Applied Physics Letters
DOI: 10.1063/5.0297949
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: European Commission, Deutsche Forschungsgemeinschaft, National Research Council of Science and Technology, Ministry of Science and ICT, South Korea, Horizon 2020 Framework Programme, HORIZON EUROPE Framework Programme, H2020 Marie Skłodowska-Curie Actions, HORIZON EUROPE European Research Council
Awards: Thermisch aktivierte Skyrmionen: von der individuellen zur kollektiven Dynamik, G1143725405, G1158078440, Nonlinear Magnons for Reservoir Computing in Reciprocal Space, G184581589, G2095278010, Novel Spin-Based Building Blocks for Advanced TeraHertz Applications, TRR 173: Spin+X: Der Spin in seiner kollektiven Umgebung, G3121511928, G3398379957, G3614653396, G4276695809, G434337789, G4601344203, G5670669577, GSC 266: MAterialwissenschaften IN MainZ, G6366207894, G6729595857, G7120975039, G7358480839, G7905814814, G925760876, G944310817
OpenAlex ID: W4416862133