Control of current-induced skyrmion motion in ratchet-type skyrmion-based racetrack memory with a loop structure

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<jats:title>Abstract</jats:title> <jats:p>We propose a method to realize a ratchet-type skyrmion-based racetrack memory with a loop structure using current and validate the proposed method using micromagnetic simulations. The proposed method utilizes the ratchet effect composed of a gradient with perpendicular magnetic anisotropy (PMA). The skyrmion moves circularly inside a track, which is composed of regions with various gradients of PMA. The results demonstrate that the recording density and operating frequency of the memory are approximately 40 Gbit inch<jats:sup>–2</jats:sup> and 42 MHz, respectively, when the diameter of the skyrmion is 28.1 nm.</jats:p>

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