Spin vortex lattice in the Landau vortex-free state of rotating superfluids

We show that the Landau vortex-free state in rotating container may give rise to the lattice of spin vortices. We consider this effect on example of spin vortices in magnon Bose-Einstein condensate (the phase coherent spin precession) in the B-phase of superfluid ${}^3$He, and on example of spin vortices in the polar phase of ${}^3$He.