Stretching of stripe domains in ion-implanted channels

The dynamic behavior of stripe domains stretching under the influence of a surrounding hairpin conductor and ion-implanted channel is investigated using high speed optical sampling techniques. Experiments were conducted on 2μm bubble supporting material. Various channel widths, ranging from 1.5μm to 3.0μm were used. The direction and magnitude of the applied in-plane field were also varied. An initial linear mobility μ1is observed followed by a sharp drop in velocity and another linear region with mobility μ2<μ1. This second region is accompanied by an overshoot phenomenon in which the stripe head is observed to move after the termination of the drive field. In addition, deflection of the stripe head, presumably by gyroscopic forces, is observed in the high drive region, particularly in the wider channels. These results suggest the formation of vertical wall structures during the stretching process. Optimal phase angles for stretching and de-stretching(collapse) in the absence of a permalloy sense element have been found that are based on measurements of the critical bias field for bubble-stripe transition as a functlon of in-plane field angle.