State identification and stability of magnetic bubbles with unit winding number

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Abstract
High‐speed photography has been used to distinguish between the possible S=1 bubble states. Transient photographs show that one of the states has two slow wall sections, each of which contains one member of a pair of opposite‐winding vertical Bloch lines. The two unichiral states are detectable because of the characteristically slow velocity of a wall whose center spin is opposed to an applied in‐plane field. It is confirmed that bubbles containing a pair of opposite‐winding VBL’s automote when subjected to bias field pulsing and a constant in‐plane field. Under certain pulse conditions, unichiral bubbles are shown to automote. The stability of each of the possible S=1 states with respect to the pulse amplitude and width is investigated.