The ceramic composites, (La 0.7Pb 0.3MnO 3) 1-x (SiO 2) x, with diluted magnetic properties are prepared using solid-sate sintering route. Magnetization processes of (La 0.7Pb 0.3MnO 3) 1-x (SiO 2) x composites are explored in this study. Ferromagnetism is gradually attenuated due to the magnetic dilution induced by the increase of SiO 2 content. Clearly, irreversible behavior is observed in the zero-field cooling and the field cooling (ZFC-FC) curves at a low field of 100 Oe. Saturation magnetization decreases as x increases while ferromagnetic transition temperature remains around 346 K for all composites. All the composites exhibit ferromagnetic hysteresis behavior which can be modeled by the law of the approach to saturation in the form M=M S(1-a/H). The term a/H expresses the deviation of magnetization from saturation. The smaller factor a for La 0.7Pb 0.3MnO 3-rich samples results in sharper square curve which should be associated with the long-range spin order of ferromagnetic coupling.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics