Bioflm colonisation of surfaces is of critical importance in various areas ranging from indwellingmedical devices to industrial setups. Of particular importance is the reduced susceptibility ofbacteria embedded in a bioflm to existing antimicrobial agents. In this paper, we demonstrate thatremotely actuated magnetic cantilevers grafted on a substrate act efciently in preventing bacterialbioflm formation. When exposed to an alternating magnetic feld, the fexible magnetic cantileversvertically defect from their initial position periodically, with an extremely low frequency (0.16 Hz).The cantilevers’ beating prevents the initial stage of bacterial adhesion to the substrate surface andthe subsequent bioflm growth. Our experimental data on E. coli liquid cultures demonstrate up to a70% reduction in bioflm formation. A theoretical model has been developed to predict the amplitudeof the cantilevers vertical defection. Our results demonstrate proof-of-concept for a device that canmagneto-mechanically prevent the frst stage in bacterial bioflm formation, acting as on-demandfouling release active surfaces.