Influence of temperature on vertical Bloch lines in the domain walls of three kinds of hard domains

Abstract

The temperature stability of vertical Bloch lines in the domain walls of three kinds of hard domains in uncompressed states is investigated experimentally. It is found that there exist three critical temperature ranges in which vertical Bloch lines are unstable for each kind of hard domain, i.e., [T01,(T0)OHB] for ordinary hard bubbles (OHBs), [T01,(T0)ID] for the first kind of dumbbells (IDs), and [T01,(T0)IID] for the second kind of dumbbells (IIDs). Here T01 is the initial critical temperatures in which vertical Bloch lines, in the walls of ordinary hard bubbles, the first kind of dumbbells and the second kind of dumbbells, are annihilated, while (T0)OHB, (T0)ID, and (T0)IID are the final critical temperatures at which vertical Bloch lines in their corresponding hard domains annihilate completely.