Magnetocapacitance based magnetoelectric coupling behavior of multiferroic BiFeO3 nanocrystals: An empirical investigation

BiFeO3 is an attractive multiferroic ceramic for device application. The magnetoelectric coupling coefficient (αE ~ 2.2 mV/cm-Oe) of single-phase BiFeO3 ceramic is denominated here, which is calculated by theoretical method (by using the numerical value of capacitance) in place of direct measurement of voltage. An applied magnetic field raises the capacitance of the pellet of BiFeO3; analogous change in voltage gives the values of magnetoelectric coupling coefficient. Moreover, using the Ginzburg-Landau theory, the magnetoelectric interaction constant (γ) was calculated around ~ 9.3 × 10−1, which is numerically two times lower than the magnetoelectric coupling coefficient. This theoretical cum experimental study is very important in the view point of science and devices.