Magnetic properties of MnFe2-xAgxO4(0≤x≤0.6) nanoparticles

Magnetic properties of ~7nm to ~4nm MnFe2-xAgxO4 (where x=0, 0.1, 0.2, 0.3 and 0.6) nanoparticles hasbeen studied thought AC magnetic susceptibility measurements. The samples showed superparamagnetic behaviour at room temperature which confirmed by AC susceptibility. At low temperatures all the samples showed a frustrated superspin glass state and a frequency dependent behaviour. The results confirmed presence of short range strong magnetic interactions between nanoparticles. Interactions strength decrease by increasing the Ag content in the samples, in agreement with results of critical slowing down model.

کلیدواژه ها:

Magnetic nanoparticles ، Superspin ، AC susceptibility ، Relaxation Mechanism