Magnetic Hyperthermia In Single-Domain Monodisperse Feco Nanoparticles: Evidences For Stoner-Wohlfarth Behavior And Large Losses
JOURNAL OF APPLIED PHYSICS(2009)
摘要
We report on hyperthermia measurements on a colloidal solution of 14.2 +/- 1.5 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 noninteracting NPs. The measured losses (1.5 mJ/g) compare to the highest of the literature, although the saturation magnetization of the NPs is well below the bulk one.
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关键词
biomagnetism, cobalt alloys, coercive force, colloids, ferromagnetic materials, hyperthermia, iron alloys, magnetic domains, magnetic hysteresis, magnetic particles, nanoparticles, nanotechnology
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