"Hot Nanotechnology Papers 2011": Gd substituted NiCa Ferrite/poly vinyl alcohol nanocomposite

Title: Gd substituted NiCa Ferrite/poly vinyl alcohol nanocomposite
Authors: Arun S. Prasad, S. N. Dolia
Affiliation: 1. Dept. of Physics, Arulmigu Meenakshi Amman College of
Engineering, Kanchipuram, India

2. Dept. of Physics, University of Rajasthan, Jaipur, India.


Magnetic nanocomposite material composed of poly vinyl alcohol encapsulated Ni0.2Ca0.8Gd0.08Fe1.92O4 was synthesized by a two step chemical method
including sol–gel combustion and solvent casting technique. The obtained
samples were characterized by powder X-ray diffraction; transmission
electron microscopy and Fourier transform infrared spectroscopy. The results
of spectroanalysis pointed towards the existence of a considerably feasible
interaction between the polymer chain and the ferrite particles. The dc
magnetization measurements divulged that both pristine and the nanocomposite
samples under applied magnetic field exhibit no hysteretic behavior at room
temperature, symptomatic of the superparamagnetic behavior. The departure of
field cooled and zero field cooled curves in the moment-versus-temperature
plot further confirmed the room temperature superparamagnetic behavior. The
extrapolation of the slope of the curves to *M=*0 imparted the average value
of Curie temperature at ∼323 K (50 °C) for both the samples, suggestive of
the efficacy of the material for finding application in self controlled

Link: http://dx.doi.org/10.1016/j.jmmm.2011.10.011

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