Abstract
We report on the switching of the magnetic vortex core in a Pac-man disk using a nanosecond current pulse, investigated via micromagnetic simulations. The minimum core switching current density is reduced by 75% compared with that of a circular disk with the same diameter and thickness. The direction of the nucleation core is determined by the kinetic field of the out-of-plane component, which is induced by the core motion. We also show that the polarity of the core can be uniquely controlled by adjusting the direction of the current pulse.
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