Colossal Spin Transfer Torque Effect on Skyrmion along the Edge

We study by the micromagnetic simulations
the skyrmion motion along
the edge driven by the current transverse to it. We found that (i)
the velocity is enhanced by the factor of ∼1/α (α:
the Gilbert damping) with the maximum value determined only by the
confining force from the edge, (ii) the inertia appear due to the
confining potential with the coordinate perpendicular to the edge
playing the role of the kinetic momentum, and (iii) the collision
between the two skyrmions is almost elastic without causing any internal
distortions.