Numerical analysis of the dynamic susceptibilities in ferroelectric (Fe)/ferromagnet (FM) bilayer with a linear magnetoelectric coupling at the interface.

In this paper, we discuss the susceptibilities of a bilayer system which is comprised of ferroelectric (FE) and ferromagnetic (FM) material. At the interface between FE and FM, the magnetoelectric (ME) interaction exist, resulting in a ME coupling. The derivation of the susceptibilities of the bilayer system was started by determining the FE and FM energy densities. Then, the entire-cell effective medium method was employed to obtain effective susceptibilities of the bilayer system. As a result of the existence of ME coupling, we obtain not only ferromagnetic and ferroelectric susceptibilities, but also magnetoelectric and electro-magnetic susceptibilities. Here, magnetoelectric susceptibility relates magnetization and electric field while electro-magnetic susceptibility links the electric polarization and magnetic fields. We also found that the ME coupling also shifts the magnetic resonance frequency. [ABSTRACT FROM AUTHOR]