Magnetic nanoparticles can be used to destroy cancer cells. The knowledge of the rheological properties of the cancer cells allows to model the motion of the particles at the surface of the membrane and to get a better understanding of the mechanisms. We have carried out a general analysis of the AFM tip motion which contains both the indentation and relaxation steps, allowing a better determination of the rheological parameters of cancer cells. The knowledge of the viscoelastic behavior of these cells allowed us to predict their indentation by magnetic particles submitted to an alternative...