Electron Paramagnetic Resonance (EPR) in Mn1-xZnx Ferrite Nanoparticles Synthesized at Room Temperature

OSCAR ALONSO MARIN RAMIREZ; MIGUEL ESPITIA; OVIDIO ALMANZA; OCTAVIO GUZMAN; AMINTA MENDOZA

Rio de Janeiro, Brasil

Workshop; VIII Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2007

We report on magnetic resonance on Mnx Zn1-x ferrite nanoparticles obtained by normal micellar technique. EPR measurement at 180 K were carried out in the x range (0 - 0.75). The EPR spectra show the presence Mn+2, Fe+2 y Fe+3 ions. The experimental behavior for the peak-to-peak linewidth dHpp in nanoparticles, have been attributed to the monodomain ferrimagnetic particles. The experimental gyromagnetic value g is 2.0036. The result shows an increase of dHpp by increasing the Zn concentration. EPR spectra were fitted using a Lorentzian and Gaussian functions. Mn0.25Zn0.75 ferrite nanoparticles were diluted in aqueous medium at different concentration. The change in the EPR signal indicated a super-paramagnetic behavior.