Emergence of ferrimagnetism along with magnetoelectric coupling in Ba0.83Sr0.07Ca0.10TiO3/BaFe12O19 multiferroic composites

In order to improve the multiferroic characteristics of BaTiO 3 based composites, diphasic magnetoelectric composites of (1- x )Ba 0.83 Ca 0.10 Sr 0.07 TiO 3 -( x )BaFe 12 O 19 ( x  = 0–0.30) were systematically investigated. A cheap and commercially viable modified mechano-chemical activation technique has been used for the synthesis of materials. The dielectric , ferroelectric and piezoelectric characteristics of composites are slightly degraded with substitution, which may be ascribed to non-ferroelectric nature of BaFe 12 O 19 compared to Ba 0.83 Sr 0.07 Ca 0.10 TiO 3 . However, there is a significant improvement in the magnetic properties of the composites. The composites have demonstrated a classical ferrimagnetic behavior, which is mainly attributed to the presence of BaFe 12 O 19 phase. The magnetoelectric response of the composites has also shown a substantial improvement compared to pristine Ba 0.83 Sr 0.07 Ca 0.10 TiO 3 sample, which is non-magnetic in nature and therefore, do not possess any magnetoelectric characteristics. A dielectric constant of 6435 and maximum magnetoelectric constant of 4.79 mV/cm Oe has been obtained for the sample with concentration x = 0.30. The main objective of this work is to design a composite system with improved multiferroic and magnetoelectric properties and therefore, the obtained electrical properties of composites are still appreciable considering a progressive improvement in magnetic properties with BaFe 12 O 19 substitution. A large value of dielectric constant combined with moderate magnetic characteristics of these composites can provide a potential application in related electronic devices.