2026-04-17T19:09:14Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1476842025-12-04T20:45:16Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Bryan, M. T. author García-Torres, J. author Martin, E. L. author Hamilton, J. K. author Calero Borrallo, Carles author Petrov, P. G. author Winlove, C. P. author Pagonabarraga Mora, Ignacio author Tierno, Pietro author Sagués i Mestre, Francesc author Ogrin, F. Y. author 2020-01-13T16:37:02Z 2020-01-13T16:37:02Z 2019-04-08 2020-01-13T16:37:02Z Self-propulsion of magneto-elastic composite microswimmers is demonstrated under a uniaxial field at both the air-water and the water-substrate interfaces. The microswimmers are made of elastically linked magnetically hard Co-Ni-P and soft Co ferromagnets, fabricated using standard photolithography and electrodeposition. Swimming speed and direction are dependent on the field frequency and amplitude, reaching a maximum of 95.1 μm/s on the substrate surface. Fastest motion occurs at low frequencies via a spinning (air-water interface) or tumbling (water-substrate interface) mode that induces transient inertial motion. Higher frequencies result in low Reynolds number propagation at both interfaces via a rocking mode. Therefore, the same microswimmer can be operated as either a high or a low Reynolds number swimmer. Swimmer pairs agglomerate to form a faster superstructure that propels via spinning and rocking modes analogous to those seen in isolated swimmers. Microswimmer propulsion is driven by a combination of dipolar interactions between the Co and Co-Ni-P magnets and rotational torque due to the applied field, combined with elastic deformation and hydrodynamic interactions between different parts of the swimmer, in agreement with previous models. Magnetisme Ferromagnetisme Fotolitografia Magnetism Ferromagnetism Photolithography Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field