TSDC Study of Ferrite Nanoparticle Doped PMMA Polymer

Charge storage and decay in a Co-Ferrite-PMMA-polymer composite has been investigated through the well known Thermally Stimulated Depolarization Current (TSDC) mechanism. TSDC spectrum of Pure Polymethayl methacrylate (PMMA) shows two main peaks at temperatures 345K and 241K related to α and β relaxation modes. The α peak arises due to the glass transition (∼350K) of PMMA, while the broad β relaxation shows the involvement of secondary slow relaxation processes. Addition of Co ferrite particles substantially reduces the de-polarization currents and shifts the occurrence to higher temperatures. Such polymer composites are expected to find applications in high density nonvolatile memory device and high frequency devices.