Inertia, diffusion, and dynamics of a driven skyrmion
By C. Schutte, J. Iwasaki, Achim Rosch, N. Nagaosa. 2014
139 citations recorded by the source corpus.
Skyrmions recently discovered in chiral magnets are a promising candidate for magnetic storage devices because of their topological stability, small size ($\ensuremath{\sim}3--100$ nm), and ultralow threshold current density ($\ensuremath{\sim}{10}^{6}$ ${A/m}^{2}$) to drive their motion. However, the time-dependent dynamics has hitherto been largely unexplored. Here, we show, by combining the numerical solution of the Landau-Lifshitz-Gilbert equation and the analysis of a generalized Thiele's equation, that inertial effects are almost completely absent in skyrmion dynamics driven by a time-dependent current. In contrast, the response to time-dependent magnetic forces and thermal fluctuations depends strongly on frequency and is described by a large effective mass and a (anti-) damping depending on the acceleration of the skyrmion. Thermal diffusion is strongly suppressed by the cyclotron motion and is proportional to the Gilbert damping coefficient $\ensuremath{\alpha}$. This indicates that the skyrmion position is stable, and its motion responds to the time-dependent current without delay or retardation even if it is fast. These findings demonstrate the advantages of skyrmions as information carriers.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/823c8dafd7e1c9e369fe62e180fea33fed8c2882
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Antiferromagnetic spintronics (2016, background): “The diffusion coefficient is thus reduced in the ferromagnetic case (Schütte et al., 2014)”