Speaker
Description
In cubic chiral magnets, the efficient coupling of magnetic skyrmion lattices to spin currents and magnetic fields permits their dynamical manipulation. When placed in a magnetic field with a slowly oscillating direction, the skyrmion lattice can be depinned, realizing a non-equilibrium state with vanishing depinning currents. With the combination of oscillating magnetic fields and applied electric currents, we explore a rich non-equilibrium phase diagram characterized by distinct stages of skyrmion lattice unpinning. We propose an effective slip–stick model for the bending and motion of the skyrmion lines in the presence of disorder, which reproduces key features observed in transverse susceptibility and time-resolved small-angle neutron scattering measurements and describes the existence of several dynamical skyrmion lattice phases under shaking and pushing, representing new phases of matter far from thermal equilibrium.
