We investigated the shape anisotropy effect on switching the behaviors of submicron permalloy Pac-man (PM) elements with a thickness of 40 nm by a magnetic force microscope. The probability to form a vortex configuration at an as-patterned state was lower in an elongated PM type-I (EPM-I) (10%) than a PM-I element (47%). The switching process in PM-I, PM-II, and EPM-I elements was governed by a vortex-driven reversal, while the magnetization of a EPM-II element switches through a single-domain reversal. It was found that a PM element involving a vortex-driven switching process shows a nonreproducible reversal.
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Park et al. (2004) studied this question.
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