T型螺旋磁性纳米结中磁Skyrmions的连续成核动力学
Continuous Nucleation Dynamics of Magnetic Skyrmions in T-shaped Helimagnetic Nanojunction
摘要：
磁skyrmions是存在于螺旋材料中的具有拓扑结构保护的自旋织构，它可以作为自旋电子学中非易失性存储器和逻辑电路的信息载体。寻找简单、可控的方法制备孤立的磁性Skyrmions是进一步技术发展和工业设计的需要。基于微磁学模拟，我们表明，时间耗散结构可以在T形helmagnetic纳米结时，它是由一个恒定的自旋极化电流驱动到远离平衡制度。然后，在纳米结的周期性磁化动力学过程中，磁性skyrmions可以连续成核。我们系统地研究了电流密度、Dzyaloshinskiii-Moriya相互作用、外加磁场和热涨落对磁skyrmion成核动力学的影响。我们的研究结果表明，一种新颖的和有前途的机制，不断创造磁skyrmion的skyrmion为基础的自旋电子器件的发展。
英文摘要：
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.
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