Lattice mismatch effects between the substrate and GMR La0.7Sr0.3MnO3 thinfilms studied by scanning probe microscopy and Raman spectroscopy

The characterisation by magnetic force microscopy (MFM) of the magnetic mic rostructure of the surface of two ferromagnetic La0.7Sr0.3MnO3 films deposi ted on two oriented LaAlO3 (001) and SrTiO3 (001) substrates is reported. U sing Raman spectroscopy, the vibrational modes of the thin films are studie d and compared to the bulk ones. We show that the magnetic pattern recorded by MFM for the two films can be correlated to shifts of modes in the Raman spectroscopy spectra. These results are explained by taking into account t he lattice mismatch between the film and the substrate and interpreted in t erms of stress induced in the film by the substrate.