Magnetic field dependence of most stable vortex states in the chiral helimagnet / superconductor bilayer system

Abstract

We have studied vortex states in chiral helimagnet / superconductor bilayer systems. An effect of a chiral helimagnet on a superconductor is taken as an external magnetic field. Solving the Ginzburg-Landau equations, we obtain various vortex configurations. In order to find a stable vortex state, we compare the Ginzburg-Landau free energies of these states. Under the large magnetic field from the chiral helimagnet, the state in which vortices appear in a row becomes more stable.