Thermisch aktivierte Skyrmionen: von der individuellen zur kollektiven Dynamik
- AG Nowak (Theoretische Physik mit SP Moderne Materialeigenschaften)
|(2023): Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force Nature Communications. Springer. 2023, 14(1), 5424. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-40720-0||
Magnetic skyrmions, topologically-stabilized spin textures that emerge in magnetic systems, have garnered considerable interest due to a variety of electromagnetic responses that are governed by the topology. The topology that creates a microscopic gyrotropic force also causes detrimental effects, such as the skyrmion Hall effect, which is a well-studied phenomenon highlighting the influence of topology on the deterministic dynamics and drift motion. Furthermore, the gyrotropic force is anticipated to have a substantial impact on stochastic diffusive motion; however, the predicted repercussions have yet to be demonstrated, even qualitatively. Here we demonstrate enhanced thermally-activated diffusive motion of skyrmions in a specifically designed synthetic antiferromagnet. Suppressing the effective gyrotropic force by tuning the angular momentum compensation leads to a more than 10 times enhanced diffusion coefficient compared to that of ferromagnetic skyrmions. Consequently, our findings not only demonstrate the gyro-force dependence of the diffusion coefficient but also enable ultimately energy-efficient unconventional stochastic computing.
|Laufzeit:||16.07.2021 – 16.07.2024|