We propose an experimental technique that allows us a straightforward and reliablefabrication of magnetic and electromechanical nanodevices for single particle detection andcharacterization. We demonstrate three different experimental methods for fabrication ofnanoscale devices consisting of either single or multiwall carbon nanotubes bridgingmetallic electrodes and decorated with magnetic iron/iron oxide nanocubes with a size of18 nm. Electrical characterization of the devices as well as structural and magneticinvestigations of nanoparticles are reported. In particular, the proposed method based onmeasurements of the magnetic resonance in a single nanoparticle will enable dynamicmagnetic resonance measurements on a single magnetic nanoparticle with a moment of∼105 μB that are not feasible using conventional experimental techniques.