Estradé Albiol, SòniaArbiol i Cobos, JordiPeiró Martínez, FranciscaInfante, I. C.Sánchez Barrera, FlorencioFontcuberta i Griñó, JosepPeña, F. de laWalls, M.Colliex, C.2012-10-112012-10-1120080003-6951https://hdl.handle.net/2445/32274Electron energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 films grown on SrTiO3 001 and 110 substrates. It is found that in partially relaxed 110 films cationic composition and valence state of Mn3+/4+ ions are preserved across the film thickness. In contrast, in fully strained 001 films, the Ca/La ratio gradually changes across the film, being La rich at film/substrate interface and La depleted at free surface; Mn valence state changes accordingly. These observations suggest that a strongly orientation-dependent adaptative composition mechanism dominates stress accommodation in manganite films and provides microscopic understanding of their dissimilar magnetic properties.3 p.application/pdfeng(c) American Institute of Physics , 2008Propietats magnètiquesPel·lícules finesEspintrònicaEspectroscòpia de pèrdua d'energia d'electronsMagnetic propertiesThin filmsSpintronicsElectron energy loss spectroscopyinfo:eu-repo/semantics/article5611192012-10-11info:eu-repo/semantics/openAccess