Abstract: A fast and straightforward strategy for thermo-polymerization of polymer shells, at room temperature, at magnetic nanoparticles (MNP) surface under alternating magnetic field (AMF) is presented. The polymerization is triggered by the local heat generated by the MNP when exposed to AMF to polymerize an organic shell around the MNP by thermo-activation. This synthetic approach provides a versatile strategy for magnetic nanoparticles surface polymerization without macroscopic temperature increase, allowing efficient pathways to magnetically induce single layer by layer polymer shells. Using molecularly imprinted polymer layer polymerized at room temperature, this method provides an unprecedented multifunctionnal nanoplatform adapted to pollutant targeting