ANNIHILATION OF VERTICAL-BLOCH-LINE CHAINS IN THE WALLS OF ORDINARY HARD BUBBLES SUBJECTED TO JOINT STATIC BIAS FIELD AND IN-PLANE FIELD

For the ordinary hard bubbles(OHBs) of garnet bubble films, the annihilation of the vertical-Bloch line (VBL) chains in their walls subjected to joint static bias field H_b and in plane field H_ip was experimentally studied. The curves of two critical in-plane fields, H⁽¹⁾_ip and H′_ip, vs H_b were measured. By means of the so-called "head-cut" and "tail-cut" experiments designed in this work, it was verified that for the OHBs subjected to H_ip, their VBL chains with different lengths lose VBLs and become shorter simultaneously. It was also verified that the critical in-plane fields H⁽¹⁾_ip and H′_ip correspond to the break down of the shortest and longest VBL chains of OHBs, respectively.