最大速度磁泡球的角度依赖性及优化设计
Angle-dependence and optimal design for magnetic bubblecade with maximum speed
摘要：
单向磁畴壁运动是下一代应用设备的关键概念。这种运动最近已经通过施加交变磁场来证明，导致磁泡的相干单向运动。在这里，我们报告的最佳配置的应用磁场的磁泡囊，磁泡的相干单向运动，由倾斜的交变磁场驱动。倾斜的交变磁场在Dzyaloshinskiii-Moriya相互作用的影响下引起磁泡的不对称膨胀和收缩，导致磁泡在时间上的连续移位。通过对PtCoPt薄膜中磁泡的实现，我们发现磁泡的速度对倾斜角很敏感，在某一角度处有一个极大值，这可以用畴壁蠕变理论的一个简单的解析形式很好地解释.最大速度角的一个简化的解析公式，然后给出作为交变磁场的振幅的函数。本文的研究结果为磁泡囊存储器和逻辑器件的设计提供了一个实用的方法。
英文摘要：
Unidirectional magnetic domain-wall motion is a key concept underlying next-generation application devices. Such motion has been recently demonstrated by applying an alternating magnetic field, resulting in the coherent unidirectional motion of magnetic bubbles. Here we report the optimal configuration of applied magnetic field for the magnetic bubblecade, the coherent unidirectional motion of magnetic bubbles, driven by a tilted alternating magnetic field. The tilted alternating magnetic field induces asymmetric expansion and shrinkage of the magnetic bubbles under the influence of the Dzyaloshinskii-Moriya interaction, resulting in continuous shift of the bubbles in time. By realizing the magnetic bubblecade in PtCoPt films, we find that the bubblecade speed is sensitive to the tilt angle with a maximum at an angle, which can be explained well by a simple analytical form within the context of the domain-wall creep theory. A simplified analytic formula for the angle for maximum speed is then given as a function of the amplitude of the alternating magnetic field. The present observation provides a practical design rule for memory and logic devices based on the magnetic bubblecade.
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