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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.25: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

The Coercivity Hc Change in Spinel Ferrite Compound Alloyed with Metals — •Ali Alidoust and Mahboubeh Houshiar — Shahid Beheshti University,Tehran,Iran

In this work, magnetic nanoparticles Co1-xNixFe2O4 with nickel concentration x=0.0, 0.5 and 1 has been prepared by coprecipitation method and their structural and magnetic properties were obtained by XRD, SEM and VSM techniques. XRD analysis shows cubic inverse spinel structures for all the nanoparticles, with space group Fd-3m without extra phases in nano dimensions. The average size of the crystals is estimated to be between 23-35 nm. This is in agreement with the SEM results. The lattice constant was seen to decrease with concentration. The analysis of VSM results with external magnetic field up to 15kOe shows that the cobalt ferrite nanoparticles are feromagnetic with high Ms and Hc at room temperature. These values dencrease with increasing x. The S shape hysteresis loop for NiFe2O4 shows nickel ferrite nanoparticles have superparamagnetic properties. The reason for this behavior can be due to the substitution of Ni ions in Octahedral cubic spinel sites which can also explain their magnetic behaviours.