Charged wall behavior in 1-µm bubble implanted structures

The domain wall pattern around a non-implanted disk and its coupling with an underlying 1-μm bubble are revealed by using colloid technique with Ferrofluid. The complex domain patterns are interpreted graphically from a three-vertex critical curve, similar to the process in uniaxial permalloy films by using the Stoner-Wohlfarth's four-vertex critical curve. The critical curve is also used to explain the charged wall's whip and flip motions during magnetization reversal around the disk.