  Understanding the multiferroic coupling is one of the key issues in the feld
of multiferroics. As shown here theoretically, the ferromagnetic resonance
(FMR) renders possible an access to the magnetoelectric coupling coefficient in
composite multiferroics. This we evidence by a detailed analysis and numerical
calculations of FMR in an unstrained chain of BaTiO3 in the tetragonal phase in
contact with Fe, including the effect of depolarizing field. The spectra of the
absorbed power in FMR are found to be sensitive to the orientation of the
interface electric polarization and to an applied static electric field. Here
we propose a method for measuring the magnetoelectric coupling coefficient by
means of FMR.
