Artificially designed self-propelled objects can allow studying active matter phenomena with great detail that is not possible in natural, e.g. biological systems. Here, we show experimental results on helical shaped, magnetically actuated, reciprocal swimmers, where the degree of randomness in the reciprocal sequence plays an important role in determining their effective motility. Here, for the first time we show the results at high activity levels where the degree of randomness is further affected by the presence of the surface, which in turn results in a non-monotonic increase of motility as a function of magnetic drive. It will be interesting to extend these studies to denser systems where the swimmers can interact with each other through hydrodynamic forces.

人工设计的自行推进物体可以允许对自然现象（例如生物系统）无法进行的详细研究活动物质现象。在这里，我们显示了螺旋形，磁力驱动的倒向游泳者的实验结果，其中倒向序列中的随机度在确定其有效运动性方面起着重要作用。在这里，我们首次展示了在高活性水平下的结果，其中表面的存在进一步影响了随机性，这反过来导致了运动的非单调性增加，这是磁驱动的函数。将这些研究扩展到更密集的系统中变得很有趣，在该系统中，游泳者可以通过流体动力相互影响。