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Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3.
Estradé Albiol, Sònia; Arbiol i Cobos, Jordi; Peiró Martínez, Francisca; Infante, I. C.; Sánchez Barrera, Florencio; Fontcuberta i Griñó, Josep; Peña, F. de la; Walls, M.; Colliex, C.
Universitat de Barcelona
Electron 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.
Propietats magnètiques
Pel·lícules fines
Espintrònica
Espectroscòpia de pèrdua d'energia d'electrons
Magnetic properties
Thin films
Spintronics
Electron energy loss spectroscopy
(c) American Institute of Physics , 2008
Article
Article - Published version
American Institute of Physics
         

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