Abstract
Abstract Hybrid multiferroics composed of ferromagnetic (FM) / ferroelectric (FE) heterostructures offer a possible route to design artificial multiferroic material exhibiting, for example, magnetoelectric coupling. We have grown BaTiO3 (100 nm)/ La2/3Sr1/3MnO3 (25 nm) bilayers on (001)-, (110)-, and (111)-oriented SrTiO3 substrate to study the induced strain influence in their magnetic properties. From structural characterization by x-ray analysis we found that La2/3Sr1/3MnO3 (LSMO) layer grew epitaxially strained, whereas BaTiO3 (BTO) film grew relaxed with lattice parameter close to that for single film. The magnetic measurements show a ferromagnetic order for all bilayers at room temperature with a Curie temperature TC∼350 K exhibiting a slight decrease of the magnetic properties (MS, HC and TC) of the bilayers in comparison with those for the La2/3Sr1/3MnO3 film. These variations could be associated to strained/relaxed regions induced by substrate orientation, and dislocation formation close to BTO/LSMO interface, among others phenomena. The magnetization mechanism was studied using the Berger model, where a critical β exponent ∼ 0.25 was found for all LSMO films in different STO orientations, which agrees with the tricritical point model. However, we found a β=0.283 only for the bilayer deposited on (001)STO substrate that coincides with previous reports for YMnO3 multiferroic materials. This behavior is not observed n either in the bilayer grown on (110) STO or (111) STO and displays indirectly a possible magnetoelectrical coupling in this configuration.
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