  We examine micromagnetic pattern formation in chiral magnets, driven by the
competition of Heisenberg exchange, Dzyaloshinskii-Moriya interaction,
easy-plane anisotropy and thermodynamic Landau potentials. Based on equivariant
bifurcation theory we prove existence of lattice solutions branching off the
zero magnetization state and investigate their stability. We observe in
particular the stabilization of quadratic vortex-antivortex lattice
configurations and instability of hexagonal skyrmion lattice configurations,
and we illustrate our findings by numerical studies.
