Abstract
In this article, we report a systematic study of room-temperature magnetoelectric coupling in 0–3 particulate and 2–2 laminated (bilayer and sandwiched) composite structures of (1 − x)BaTiO3 and (x)NiFe2O4 (x = 0.05, 0.15, 0.25, 0.35 and 0.45). Powder X-ray diffraction and scanning electron microscopic analysis confirm the existence of ferrite (spinel NiFe2O4: NFO) and ferroelectric (tetragonal BaTiO3: BTO) phases in sintered composites without any detectable impurities. Significant variations in electrical polarization and magnetization parameters are observed in composite samples compared to pristine BTO and NFO. The perceived strain-mediated magnetoelectric (ME) coupling is found to be strongly dependent on the relative mass ratio of BTO and NFO in both the particulate and laminated structures. An enhanced magnetoelectric coefficient (αME) of 25.23 mV/cm·Oe is realized for sandwiched-laminated structure of (1 − x)BaTiO3 and (x)NiFe2O4 with x = 0.45 at an applied magnetic field of 1.34 KOe compared to 0–3 particulate and bilayer-laminated composite structures.
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