Magnetic Properties of CoFe0.5Cr1.5O4 Nanoparticles
- 1. Lab. de Magnetismo, Dpto. de Física, Facultad de Ciencias, Universidad de Los Andes, 5101 Mérida, Venezuela.
- 2. Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain.
- 3. Instituto de Nanociencia de Aragón, Universidad de Zaragoza, E-50009 Zaragoza, Spain.
Description
Nanoparticles of CoFe0.5Cr1.5O4 were synthesized by using the auto-combustion method. Structural and magnetic properties were particularly investigated. The obtained powder was characterized by X-ray diffraction (XRD) and magnetic measurements as a function of temperature and applied magnetic field. X-ray diffraction data suggested the presence of single crystalline phase corresponding to cubic spinel structure. The size particle was estimated by the Scherrer equation in 23 nm. The main characteristic of the Field Cooling (FC) and Zero Field Cooling (ZFC) curves is the presence of a magnetic transition at about 175 K; below this temperature the compound is magnetically ordered, as ferrimagnetic state, and above 175 K the magnetic behavior of the system is suggested that superparamagnetic. At 5 K the mixed oxide presents a quite high coercive field, 5.8 kOe.
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