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首页> 外文期刊>IEEE Transactions on Magnetics >Controlled Current-Driven Bi-Directional Motion of Trains of Domain Walls Along a Ferromagnetic Strip
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Controlled Current-Driven Bi-Directional Motion of Trains of Domain Walls Along a Ferromagnetic Strip

机译：沿铁磁条的磁畴壁列的受控电流驱动双向运动

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Domain wall (DW)-based magnetic memories where each bit is represented by a single magnetic domain have repeatedly been proposed to implement faster and denser memory devices. Multilayer systems where an ultrathin ferromagnetic layer is sandwiched between a heavy metal and an oxide allow particularly fast and synchronous current-driven DW dynamics. However, an essential prerequisite for their feasibility is the efficient and precise control of DW positions. The position of the DWs can be controlled by tailoring the perpendicular magnetic anisotropy (PMA) by means of ion irradiation. Nevertheless, the current-driven dynamics of trains of DWs in these systems has not been addressed yet, either theoretically or numerically. Here, we proposed a triangular PMA periodic profile defined by two extremal values, K-u(+) and K-u(-) (K-u(-) < K-u(+)), and the anisotropy period, d, showing the proposal feasibility and its bi-directional features. This paper has been carried out by means of full micromagnetic simulations and a simplified 1-D model, updated to take into account the anisotropy profile. The results highlight the suitability of using an anisotropy modulated profile to efficiently and precisely define the DW equilibrium positions.
机译：重复提出了基于域壁（DW）的磁存储器，其中每个位由单个磁域表示，以实现更快，更密集的存储设备。将超薄铁磁层夹在重金属和氧化物之间的多层系统可实现特别快速和同步的电流驱动DW动力学。但是，其可行性的基本前提是对DW位置的有效和精确控制。 DW的位置可以通过离子辐照调整垂直磁各向异性（PMA）来控制。然而，无论是从理论上还是从数值上，这些系统中的DW列的电流驱动动力学都尚未得到解决。在这里，我们提出了一个由两个极值Ku（+）和Ku（-）（Ku（-）

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