Indirect magnetoelectric effect has been studied inmagnetostrictive-film/substrate/piezoelectric-actuator heterostructures. Twodifferent substrates have been employed: a flexible substrate (Young's modulusof 4 GPa) and a rigid one (Young's modulus of 180 GPa). A clear optimization ofthe indirect magnetoelectric coupling, studied by micro-strip ferromagneticresonance, has been highlighted when using the polymer substrate. However, incontrast to the rigid substrate, the flexible substrate also leads to an apriori undesirable and huge uniaxial anisotropy which seems to be related to anon equibiaxial residual stress inside the magnetostrictive film. The strongamplitude of this non equibiaxiallity is due to the large Young's modulusmismatch between the polymer and the magnetostrictive film which leads to aslight curvature along a given direction during the elaboration process andthus to a large magnetoelastic anisotropy.
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