Study of the structural properties at the LNLS in La0.75Sr0.25MnO3 /LaNiO3

J. C. ROJAS SÁNCHEZ; M. GRANADA; L.B. STEREN; I. MAZZARO; D.H. MOSCA

Río de Janeiro, Brasil

Workshop; VIII Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2007

A study of the structural properties of La0.75Sr0.25MnO3/LaNiO3 (LSMO/LNO) multilayers performed at the LNLS synchrotron will be presented in this work. The samples were grown by dc sputtering on crystalline (100) SrTiO3 (STO) substrates. The superlattices [LSMOt1/LNOt2]n consist on n bilayers LSMO/LNO being t1 and t2 the thicknesses of LSMO and LNO, respectively. The morphological and structural characterization of the samples was performed by measured of the X-ray diffraction spectroscopy (XRD) and also by X-ray reflectivity. We found that the LSMO and LNO layers grow textured in the [100] direction. The roughness at the interfaces, the lattice parameters of the films and the layer’s thicknesses (t1 and t2) of the superlattices, are calculated by fitting the theta-2theta XRD patterns at high-angles considering the kinematical model. At low angles, measurements of the reflectivity allow us to estimate the roughness at the interfaces and layer’s thicknesses considering the optical model.