Ball solitons in the kinetics of magnetic first-order phase transitions: A new mechanism of phase reconstruction

Magnetic ball solitons can arise at a spin-flop transition induced by a magnetic field in antiferromagnets with uniaxial anisotropy (as a result of energy fluctuations). Soliton states are possible in a wide range of amplitudes and energies, including negative energies with respect to the initial phase state. When an antiferromagnet is in the metastable state, the probability of formation of ball solitons becomes the highest if the energy of such states is close to zero. Ball solitons continuously evolve, transforming into macroscopic domains of a new magnetic phase.