Abstract
Recently, the characteristic twisted magnetization structure called magnetic skyrmions is expected to be a next-generation non-volatile memory and logic device [1]–[4]. It has been observed in a ferromagnetic ultrathin film with perpendicular anisotropy sandwiched with nonmagnetic layers, where the interface effect originated from the Dzyaloshinskii-Moriya interaction (DMI) is acted. In order to use skyrmions as a memory, the recorded information (= skyrmion structure) has to retain in the device. Therefore, it is necessary to investigate the stability of the skyrmion structure. In this study, we focus on the ferromagnetic ultrathin film of the Co/Ni multilayer with the DMI, and investigate the stability of the skyrmion structure using the micromagnetic simulations.
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