Domain formation and associated wall states

Generation of Bloch lines in closed domains is examined on the premise that the magnetization remains continuous at all times. The model predicts the creation of two nonunwinding lines during the formation of each domain. Precession of the wall magnetization generates trains of unwinding lines. If such a domain is split while in a comb-like configuration, the resulting walls may contain large numbers of nonunwinding lines. Conclusions are verified experimentally by determining the number and handedness of lines in domains formed under different conditions.