Paper Title
The Applications of Magneto-electric Tensor in Bismuth Ferrite under External Field

We present a framework for modeling the boundary-value problem (frequency driven) for homogeneous multiferroic material Bismuth ferriteunder the validity of post constraint and apply it to fundamental differential equation of electromagnetism in valid new regimes (boundary conditions for material with simultaneous electric and magnetic order). The only multiferroic material exhibiting the unambiguous magnetoelectric effect at room temperature is Bismuth ferrite. We illustrated the presence of tellegen parameter as magnetoelectric tensor or magneto-electric quadrupole, which is not related to the position of crystal. We developed the model to enhance the magnetoelectric effect of the bismuth ferrite. Keywords - Bismuth Ferrite, Tellegen Parameter, Post constraint, Electromagnetism, Boundary Conditions