We studied experimentally the dynamic characteristics of hard domains produced in the garnet bubble films at different pulse widths. The results show that the dumbbell domains contracted from multi-branched domains at zero static bias field rotate clockwise, independent of the pulse width of the pulsed bias field in which the multi-branched domains were produced. In the direct current fixed bias fields, soft domain segments harden and become dumbbell domains. How the dumbbell domains rotate is dependent on the pulse widths of the hardening pulsed bias field applied in the experiment. The results show that all the dumbbell domains rotate anticlockwise when the pulse width is narrow, and they rotate clockwise and anticlockwise simultaneously and then they all rotate clockwise as the width of hardening pulse becomes wider and wider. It reveals that the direct current bias field and pulsed bias field have great influence on the types of vertical Bloch line in the garnet bubble films.
The influence of in-plane field on three kinds of hard domains was studied experimentally by means of direct current bias fields reconstruction. The experiment verifies that VBLs in those three kinds of hard domains collapse gradually under the in-plane field. And the conclusion we obtained that these hard domains have the same range of the critical in-plane field [H1ip,H2ip] corrects the previous view that (H1ip)IIDH1ip)IDH1ip)OHB. By revealing that the breakdown of VBLs affected by in-plane field is independent of the rigidity of the hard domains, this paper provides an important clue for interpreting the mechanism of the VBLs' vanishing and a new scheme for exactly measuring the critical in-plane field under which VBLs begin to disappear.
The diameters of the ordinary hard bubbles (OHBs) and soft bubbles in epitaxial garnet films are measured under the microscope at various temperatures. It is found that the bubble diameters of OHBs increase with temperature, and it is concluded that the equilibrium separation between two neighbouring vertical Bloch lines (VBLs) 𝑆𝑒𝑞 is widened with increasing temperature. At the same time, the results can be understood simply as that there are more VBLs in the domain walls of the first dumbbell domains (IDs) than those in walls of OHBs at the same temperature.
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