Abstract
Abstract The magnetic properties and AC heating characteristics of Ni1-xZnxFe2O4 nanoparticles were investigated. Magnetization measurements conducted on various sample compositions revealed that the magnetization of the nanoparticles was maximum for x = 0.75 sample. Ni0.25Zn0.75Fe2O4 nanoparticles were exposed to plasma for 30 min. The resultant, magnetization (M), blocking temperature (TB), superparamagnetic transition temperature (Tm), heating temperature, and specific absorption rate (SAR) of Ni0.25Zn0.75Fe2O4 nanoparticles before and after plasma treatment showed that the plasma treatment enhanced the magnetic and thermal properties. To determine the improved characteristics in more detail, we obtained Mossbauer spectra at various temperatures. Analysis of the Mossbauer spectra of Ni0.25Zn0.75Fe2O4 nanoparticles revealed two sets of six lines for tetrahedral (A) and octahedral (B) sites. Also, Mossbauer spectra with an external field up to 1 T were performed and the spin canting angles in Ni0.25Zn0.75Fe2O4 before and after plasma treatment were determined.
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