Continuous Nucleation Dynamics of Magnetic Skyrmions in T-shaped Helimagnetic Nanojunction (1804.04022v1)

Abstract: Magnetic skyrmions are topologically-protected spin textures existing in helimagentic materials, which can be utilized as information carriers for non-volatile memories and logic circuits in spintronics. Searching simple and controllable way to create isolated magnetic skyrmions is desirable for further technology developments and industrial designs. Based on micromagnetic simulations, we show that the temporal dissipative structure can be developed in the T-shaped helimagnetic nanojunction when it is driven to the far-from-equilibrium regime by a constant spin-polarized current. Then the magnetic skyrmions can be continuously nucleated during the periodic magnetization dynamics of the nanojunction. We have systematically investigated the effects of current density, Dzyaloshinskii-Moriya interaction, external magnetic field, and thermal fluctuation on the nucleation dynamics of the magnetic skyrmions. Our results here suggest a novel and promising mechanism to continuously create magnetic skyrmions for the development of skyrmion-based spintronics devices.