Abstract
We studied Zn0.75Ni0.25Fe 2O4 magnetic nanoparticles before and after plasma treatment by employing X-ray diffraction, magnetic measurements, hyperthermia measurements using the mag-neTherm device, and Mossbauer spectroscopy. The Mossbauer spectra of Zn0.75Ni0.25Fe 2O4 were recorded at various temperatures from 4.2 to 295 K. The Mossbauer spectra for temperatures below the superparamagnetic transition temperature exhibited two sextets ascribed to tetrahedral and octahedral sites. Furthermore, the spectra demonstrated superparamagnetic behavior, as indicated by the doublet with zero hyperfine field at 295 K. The Mossbauer spectra exhibited line broadening with increasing temperature, indicating superparamagnetic relaxation. The temperature dependence of the anisotropy energy was calculated based on the relaxation frequency.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
