New low temperature phases in chiral cubic magnets*

Chiral and skyrmion-hosting cubic magnets have so far been described in terms of a universal magnetic phase diagram composed of helical spiral, conical spiral, and skyrmion crystal phases. A remarkable deviation from this universal behavior occurs in Cu2OSeO3 revealed by neutron scattering and magnetization measurements. Below the upper critical field at which the conical spiral state disappears, the spiral wave vector rotates away from the magnetic field direction. We discuss the physical origin of this new state and suggest that it provides the in-homogeneous magnetic environment required to stabilise new low temperature skyrmionic phases. We discuss the different stabilization and nucleation mechanisms and the thermodynamic stability of these low temperature skyrmionics phases, as they have been investigated by neutron scattering.