Electrical generation and deletion of magnetic skyrmions via vertical current injection

Due to its distinct topological features, magnetic skyrmions have recently been considered to be a novel information carrier in spintronics[1, 2]. The electrical creation/deletion of a magnetic skyrmion is ecessential in realizing skyrmion-based spintronics devices. Therefore, various experimental demonstrations of skyrmion creation/deletion have been reported using diverse methods [3, 4]. However, most of them have been created near a randomly created defect site, disturbing the skyrmion motion after the creation. Here, we introduce a new method for electrical creating, deleting, and shifting magnetic skyrmions by adopting a vertical current injection. We will show proof-of-concept demonstration of skyrmion reacetrack memory.