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. […]

Current-driven asymmetric magnetization switching in perpendicularly magnetized CoFeB/MgO heterostructures


Reference: J. Torrejon et al., Phys. Rev. B 91, 214434 (2015). By using analytical theory and micromagnetics simulations, we helped to explain experimental observations of an asymmetry in current-induced magnetization switching in ultrathin CoFeB/MgO films. This work has just appeared in Physical Review B. Last modified 30/06/15

Siphoning spins


A News & Views piece I wrote for Nature has just appeared. Topological insulators are well-known for their exotic electron-transport properties. A Letter out in this week describes how the spin-polarized currents at the surface of a topological insulator can be used to generate large spin-transfer torques in a transition metal ferromagnet. These torques are […]

Vortices on the move


Reference: M. Manfrini et al., “Propagation of magnetic vortices using nanocontacts as tunable attractors”, Nature Nanotechnology 9, 121-125 (2014). Our paper on moving vortices around using multiple nanocontacts has appeared in Nature Nanotechnology! There is an accompanying News & Views piece by Prof. Teruo Ono of Kyoto University. Last modified 19/06/14