Flexible and self-standing Nickel Ferrite – PVDF-TrFE casted films: A promising candidate for high-end magnetoelectric applications
Polymer - based magnetoelectrics are identified as a newly emerging area of research due to their profound potential applications centered on spintronic technology. In line with this, we have developed a novel, flexible nickel ferrite (NiFe2O4)- PVDF-TrFE (NF -PVDF-TrFE) polymer based magnetoelectric film, with excellent magnetoelectric coupling at room temperature. Nanocomposite films were prepared by solution cast method, in which the nickel ferrite nanoparticles with different weight percentage (2, 4, 8 and 16) were incorporated in the electroactive PVDF-TrFE polymer matrix. The ferroelectric β-crystalline phase of PVDF-TrFE was confirmed by X-ray diffraction (XRD), Fourier- transform infrared spectroscopy (FTIR) and Raman studies. Dielectric and thermal properties of the composite films were found to be substantially improved with the addition of magnetic nanoparticles. Ferroelectric and magnetic characteristics of the composite films were also considerably improved with an increase in NiFe2O4 concentration. A magnetic saturation (Ms) of 4.81 emu/g and a ferroelectric maximum polarization of 18.9μCcm-2 were shown by the composite film at room temperature for 16wt% loading of NF nanoparticles. Beside these functionalities, an ac and dc magnetoelectric coupling coefficients of 69 mV/cm.Oe and 90 mV/cm.Oe were obtained for 16NF-PVDF-TrFE along with excellent mechanical stability. These flexible and self-standing magnetoelectric composite films with enhanced magnetoelectric coupling coefficient at room temperature could be a suitable candidate for the development of ultramodern information storage, memory devices, signal processing devices etc.