Abstract
We have investigated structural, magnetic, optical, and electrical transport properties of Zn0.9−xFe0.1(Co∕Mn)xO (x=0.05,0.1 for Co and x=0.1 for Mn) diluted magnetic semiconducting nanoparticles synthesized through low temperature chemical “pyrophoric reaction process.” From transmission electron micrograph, particle sizes are found to be in the nanometric regime (∼7nm) and single crystalline in nature. The magnetization measurements reveal that doping of Co or Mn ions in ZnFeO nanometric matrix decreases the values of coercive field and average magnetization, not due to just increasing the total dopant concentration. It has been attributed to the formation of antiferromagnetic or paramagnetic states in ferromagnetic infinite cluster (spanning of magnetic polarons) by doping of Co or Mn ions. The strong irreversibility has been observed to persist at and above room temperature in magnetization versus temperature curve. The semiconducting band gap of those nanoparticles has been estimated using recorded absorbance spectra. The electrical behaviors of those samples have been investigated over the wide temperature and frequency range using ac complex impedance spectroscopy.
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