Phys.org September 11, 2023
Magnetic skyrmions have garnered considerable interest due to a variety of electromagnetic responses that are governed by the topology. The topology that creates a microscopic gyro tropic 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. An international team of researchers (Germany, Japan, Sweden, Czech Republic) demonstrated enhanced thermally activated diffusive motion of skyrmions in a specifically designed synthetic antiferromagnet. Suppressing the effective gyrotropic force by tuning the angular momentum compensation led to a more than 10 times enhanced diffusion coefficient compared to that of ferromagnetic skyrmions. According to the researchers their findings not only demonstrated the gyro-force dependence of the diffusion coefficient but also enabled energy-efficient unconventional stochastic computing… read more. Open Access TECHNICAL ARTICLEÂ
Experimental set up. Credit: Nature Communications volume 14, Article number: 5424 (2023)