Energy storage and magnetoelectric coupling in ferroelectric–ferrite composites
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Ferroelectric–ferrite composites of BaTiO3–CoFe2O4 (BT–CFO) is synthesized via solid state reaction method. Powder XRD confirms the phase purity as well as composite formation with tetragonal phase of the BaTiO3. The FTIR and SEM–EDS studies also confirm the formation of BT–CFO composites. The P–E loop measurement confirmed the ferroelectric nature of the sample. The maximum energy storage density and efficiency achieved for BT–5CFO (5% CoFe2O4) composite was 8.33 mJ/cm3 and an efficiency of 59.7% respectively. The coupling between the ferroelectric and ferromagnetic phases was observed in the variation of P–E loop with magnetic field. A decrease in the maximum polarization was found with increase magnetic field. The P versus M analysis confirmed the highest magneto-electric (ME) coefficient of 13.33 mV/cm/Oe for BT–5CFO composite. These results are related to the volumetric and piezoelectric strain, suppression of ferroelectric ordering reveal the magnetoelectric nature in BaTiO3–CoFe2O4 composites.
Authors are thankful to University of Delhi, New Delhi for funding the Star Innovation Project (ARSD-SIP-01). The authors would like to thank Centre for Nanoscience, Jamia Millia Islamia University, New Delhi, National Physical Laboratory (NPL) New Delhi, and NSIT, New Delhi India for their characterization facilities.