Static and dynamic magnetic experiments were conducted on polymer-coated Fe nanoparticles synthesized by a microwave plasma method. Transmission electron microscopy indicates the formation of 15–20 nm particles and agglomerated clusters. The field-dependent magnetization (M–H) data show the presence of sharp switching at low fields (∼60 Oe) followed by a gradual approach to saturation. A saturation magnetization of Ms∼80 emu/g is obtained for the nanopowder. Dynamic transverse susceptibility using a radio-frequency resonant method provides evidence for sharp switching fields and a broad distribution in anisotropy fields. These results indicate that the polymer coating plays an effective role in the underlying magnetic response of the particles.
No takes yet. Share an insight, caveat, or question.
Srikanth et al. (2001) studied this question.