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We report the first magnetic-field-dependent Raman scattering studies onPb(Zr,Ti)O3-CoFe2O4 bilayer multiferroic system. The phonon frequencies of thenano-bilayers obviously change with magnetic field, which is absent in thesingle Pb(Zr,Ti)O3 films. The magnetostriction of the CoFe2O4 layer generatesstress mechanically transferred to the Pb(Zr,Ti)O3 layer, resulting in the modechanges. The observed magnetic-field-induced softening of the soft mode in thePb(Zr,Ti)O3 layer bears a striking resemblance to direct magnetoelectric outputin the bilayers, providing evidence for stress-mediated magnetoelectriccoupling mechanism in the multiferroic bi-layers.

Magnetic-Field-Dependent Raman Scattering in Multiferroic Bilayer Films: Evidence for Stress-Mediated Magnetoelectric Coupling