Abstract
We have studied vortex states in a chiral helimagnet / superconductor bilayer system numerically. We consider a two-dimensional superconductor subsystem. An effect of a chiral helimagnet on a superconductor is taken as a magnetic field, which oscillates spatially. Solving the Ginzburg-Landau equations, we obtain various vortex states. Comparing free energies, we find the most stable vortex states under only the oscillating magnetic field HCHM and under the HCHM and the homogeneous applied magnetic field Happl.
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