Current-driven skyrmion dynamics in disordered films


Reference: J.-V. Kim and M.-W. Yoo, Appl. Phys. Lett. 110, 132404 (2017). We studied how current-driven skyrmion motion in ultrathin films is affected by disorder. We modelled the disorder by assuming a grain structure, where the local perpendicular anisotropy fluctuates from grain to grain. We find that the velocity versus current curves are reminiscent of […]

A skyrmion-based spin-torque nano-oscillator


Reference: F. Garcia-Sanchez et al., New J. Phys. 18, 075011 (2016). We show how inhomogeneous spin polarizers in the form of vortices can result in self-sustained gyration of skyrmions in magnetic nanopillars. We suggest that such dynamics could be useful for skyrmion-based spin-torque nano-oscillators. This work has just appeared in the New Journal of Physics. […]

Spin Wave Power Flow and Caustics in Ultrathin Ferromagnets with the Dzyaloshinskii-Moriya Interaction


Reference: J.-V. Kim, R. L. Stamps, and R. E. Camley, Phys. Rev. Lett. 117, 197204 (2016). We examined how the Dzyaloshinskii-Moriya interaction (DMI) influences the flow of spin waves in ultrathin films using analytical theory and micromagnetics simulations. With a point source field excitation, we find a number of different propagation regimes, such as caustics […]

MAGicSky kicks off


Our European project MAGicSKy on magnetic skyrmions is well underway with project leaders and participants from the consortium gathering in Massy this week for the inaugural project meeting. This FET-Open project is funded by the Horizon2020 Framework Programme of the European Union and will run through to September 2018. Last modified 30/10/15

Role of nonlinear anisotropic damping in the magnetization dynamics of topological solitons


Reference: J.-V. Kim, Phys. Rev. B 92, 014418 (2015). By including the Rashba interaction into a model for nonlinear feedback damping, I studied how the dynamics of magnetic solitons, such as domain walls, vortices, and skyrmions, might be affected by additional torques resulting from this damping. This work has just appeared in Physical Review B. […]