  Polycrystalline M-type hexagonal Strontium hexaferrite and its modified
systems by Cobalt (Co) and Titanium (Ti) were successfully prepared by the
solid state reaction method. The single phase formation of all the systems and
well grain growth of micrometer range was confirmed by X-ray diffraction
pattern and Scanning Electron Microscopic image respectively. The impedance
spectroscopy and dielectric properties were investigated in a selected
frequency & temperature range. The room temperature M-H loop study for
Strontium hexaferrite and Cobalt modified Strontium hexaferrite was carried out
by Vibrate Sample Magnetometer. From the investigation it was found that, the
grain, grain boundary and electrode polarization have significant effect on
dielectric relaxation and conduction mechanism for all the systems. From M-H
loop study it was found that Co modified system has drastic reduction of
coercive field.
