Magnetic and Resonance Study of Double doped M-type hexaferrite Ba1-x(CuxAlxFe12-x)O19

Abstract

Nanoparticles of Ba1-x(AlxCuxFe12-x)O19 (x varies from 0 to 1) were prepared by solid-state reaction route method. The structural and morphological characterization of samples has been investigated by X-ray diffraction and TEM. Electron Spin Resonance (ESR), Mossbauer, VSM techniques were used to study the magnetic properties of the compounds. Change in the magnetic state of nanoparticles due to doping was also examined. Mossbauer studies suggest that the sample is ferrimagnetic when x equals 0 and completely paramagnetic when x euqals 1. ESR studies reveal splitting of resonance lines at certain concentrations (x) of Cu/Al. VSM and ESR studies reveal the destruction of collective magnetism when doping is increased.