Magnetic hyperthermia in single-domain monodisperse FeCo nanoparticles:   Evidences for Stoner-Wohlfarth behaviour and large losses
  We report on hyperthermia measurements on a colloidal solution of 15 nm monodisperse FeCo nanoparticles (NPs). Losses as a function of the magnetic field display a sharp increase followed by a plateau, which is what is expected for losses of ferromagnetic single-domain NPs. The frequency dependence of the coercive field is deduced from hyperthermia measurement and is in quantitative agreement with a simple model of non-interacting NPs. The measured losses (1.5 mJ/g) compare to the highest of the literature, though the saturation magnetization of the NPs is well below the bulk one. 
L.-M. Lacroix, R. Bel Malaki, J. Carrey, S. Lachaize, G.F. Goya, B.   Chaudret, M. Respaud