Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3068195
Keywords
biomagnetism; cobalt alloys; coercive force; colloids; ferromagnetic materials; hyperthermia; iron alloys; magnetic domains; magnetic hysteresis; magnetic particles; nanoparticles; nanotechnology
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Funding
- InNaBioSantE foundation
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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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