Resonance Frequency Shift of Microcantilever via Surface Adsorption of Magnetic Nanoparticles

In this study, we have considered the physical adsorption of Fe3O4 magnetic nanoparticles having a size of a few tens of nanometers onto the surface of a microcantilever, and observed the following resonance frequency shift of the microcantilever. The change in the effective mass of the microcantilever depending on the level of the surface adsorption of nanoparticles on the microcantilever has been determined from the observed resonance frequency shift based on a simple mechanical model, leading to the estimation of the number of nanoparticles adsorbed on the microcantilever surface.