Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3.

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....

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Bibliographic Details
Authors: 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.
Format: article
Status:Published version
Publication Date:2008
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/32274
Online Access:https://hdl.handle.net/2445/32274
Access Level:Open access
Keyword:Propietats magnètiques
Pel·lícules fines
Espintrònica
Espectroscòpia de pèrdua d'energia d'electrons
Magnetic properties
Thin films
Spintronics
Electron energy loss spectroscopy
Description
Summary: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.

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