During the ascending branch of the magnetization, the right domain increases in size and accompanied by the corresponding reduction of the left. Note that prior to coalescence with the growing right domain, the crosstie at the center remains stationary, albeit, the intensity diminishes and cants towards the growing right domain. The crosstie was observed only during the initial remanent state and in the ascending branch, but not during the descending branch and negative field. This is enigmatic. Net moment at remanenence.
All samples have zero or close to zero total magnetization at remanence.
Since the films are only 26 nm thick, it can be assumed that the magnetization lies entirely in the plane of the film. Since the surface charges are non-existent in these patterns, then the contrast is due primarily to the divergence term occuring at the domain wall boundaries. Differentiation between a Bloch line and a crosstie. Bloch lines and crossties occur as the sense of rotation of the moments in the interior of a 180 degree wall is reversed. In Bloch lines, the sense of rotation of the moment is in phase with the direction of the magnetization in the main domains, whereas in the crossties, it is out-of phase.