Dependence of Vortex States in Superconductors on a Chiral Helimagnet   and an Applied Magnetic Field
  We study effects of a chiral helimagnet (CHM) on vortex states in a superconductor, solving the Ginzburg-Landau equations in a chiral helimagnet/superconductor bilayer system. We found that vortices form a periodically modulated triangular lattice, because the magnetic field from the chiral helimagnet $H_{CHM}$ oscillates spatially. An increase of a critical current is expected, because vortices are pinned by the $H_{CHM}$. 
Saoto Fukui, Masaru Kato, Yoshihiko Togawa
cond-mat.supr-con