Externally controlled microswimmers offer prospects for transport in biological research and medical applications. This requires biocompatibility of the swimmers and the possibility to tailor their propulsion mechanisms to the respective low Reynolds number environment. Here, we incorporate low amounts of the biocompatible alloy of iron and platinum (FePt) in its \(\hbox {L1}_{{0}}\) phase in microstructures by a versatile one-step physical vapor deposition process. We show that the hard magnetic properties of \(\hbox {L1}_{{0}}\) FePt are beneficial for the propulsion of helical micropropellers with rotating magnetic fields. Finally, we find that the FePt coatings are catalytically active and also make for Janus microswimmers that can be light-actuated and magnetically guided.

外部控制的微型游泳者为生物研究和医学应用中的运输提供了前景。这需要游泳者的生物相容性以及根据各自的低雷诺数环境调整其推进机制的可能性。在这里，我们通过通用的一步物理气相沉积工艺在其微观结构中的\(\hbox {L1}_{{0}}\)相中加入少量的铁和铂的生物相容性合金 (FePt) 。我们表明\(\hbox {L1}_{{0}}\) FePt的硬磁特性有利于具有旋转磁场的螺旋微型螺旋桨的推进。最后，我们发现 FePt 涂层具有催化活性，并且还可用于制造可以光驱动和磁导的 Janus 微型游泳器。