2025/11/19 by Harsha Chouhan, Maheswar Panda, Sushil Kumar Behera +4 · 1 citation
Engineering · Materials Science · #Advanced Sensor and Energy Harvesting Materials #Multiferroics and related materials #Dielectric materials and actuators
paper · doi:10.1142/s021798492550277x
The lead-free flexible polymer magneto-electrics (PME) composed of ([Formula: see text] (CoFe 2 O[Formula: see text] - (1[Formula: see text] polyvinylidene fluoride (PVDF), where x varies from 0 to 1 in increments of 0.1, is developed using a co-precipitation and novel cold-pressed route. The percolation, dielectric, ferroelectric, magnetic, and magnetoelectric properties are systematically investigated. The highest crystallite size of 15.4[Formula: see text]nm and the least strain of approximately 0.00156 are noticed from the Williamson–Hall (W–H) plot in CoFe 2 O 4 (CF). At the percolation threshold of [Formula: see text], scaling exponents were obtained as [Formula: see text] and [Formula: see text], which lie within the universal region. The low dielectric loss ([Formula: see text]1 at 10[Formula: see text]kHz) and KWW-fitted modulus show the values of stretching coefficient ([Formula: see text] as 0.004, 0.005, and 0.012 for [Formula: see text], 0.4, and 0.5 compositions, respectively, suggesting non-Debye type relaxation. P–E hysteresis confirmed ferroelectric characteristics at 10[Formula: see text]Hz, and the Weibull distribution function showed high breakdown strength for 0.9PVDF–0.1CF. Further, the magnetization is about 72.6[Formula: see text]emu/gm for CF. Moreover, the ferromagnetic nature of PME is confirmed by the positive slope in the Arrott plot. Significant magnetoelectric coupling is observed of approximately 13.20[Formula: see text]mV/cm[Formula: see text]Oe for the composition 0.9PVDF–0.1CF at an AC field of 20[Formula: see text]Oe at a frequency of 540 Hz at room temperature due to the charge transfer between the phases, conductivity, and dielectric constant of the composite. The magnetoelectric coupling response is reported in varying the frequency from 23[Formula: see text]kHz to 1[Formula: see text]kHz as well as temperatures up to 295–353[Formula: see text]K.