title: Interface effects and the evolution of ferromagnetism in La2/3Sr1/3MnO3ultrathin films.
abstract: Pulse laser deposited La2/3Sr1/3MnO3ultrathin films on SrTiO3substrates were characterized by polar and longitudinal Kerr magneto-optical spectroscopy. Experimental data were confronted with theoretical simulations based on the transfer matrix formalism. An excellent agreement was achieved for a 10.7 nm thick film, while a distinction in the Kerr effect amplitudes was obtained for a 5 nm thick film. This demonstrated the suppression of ferromagnetism due to the layer/substrate interface effects. A revised, depth-sensitive theoretical model with monolayer resolution described the experimental data well, and provided clear cross-section information about the evolution of ferromagnetism inside the film. It was found that the full restoration of the double-exchange mechanism, responsible for the ferromagnetic ordering in La2/3Sr1/3MnO3, occurs within the first nine monolayers of the film. Moreover, all the studied films exhibited magneto-optical properties similar to bulk crystals and thick films. This confirmed a fully developed perovskite structure down to 5 nm.
authors.affiliation: Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, 12116, Prague 2, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Veis
authors.affiliation: Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, 12116, Prague 2, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Zahradnik
authors.affiliation: Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, 12116, Prague 2, Czech Republic.
authors.forename: R
authors.initials: R
authors.lastname: Antos
authors.affiliation: Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, 12116, Prague 2, Czech Republic.
authors.forename: S
authors.initials: S
authors.lastname: Visnovsky
authors.affiliation: d'Electronique Fondamentale, IEF/UMR 862, Université Paris Sud XI, F-91405 Orsay Cedex, France.
authors.forename: Ph
authors.initials: P
authors.lastname: Lecoeur
authors.affiliation: d'Electronique Fondamentale, IEF/UMR 862, Université Paris Sud XI, F-91405 Orsay Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Esteve
authors.affiliation: d'Electronique Fondamentale, IEF/UMR 862, Université Paris Sud XI, F-91405 Orsay Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Autier-Laurent
authors.affiliation: d'Electronique Fondamentale, IEF/UMR 862, Université Paris Sud XI, F-91405 Orsay Cedex, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Renard
authors.affiliation: d'Electronique Fondamentale, IEF/UMR 862, Université Paris Sud XI, F-91405 Orsay Cedex, France.
authors.forename: P
authors.initials: P
authors.lastname: Beauvillain
keywords: Interface effects; Magneto-optical Kerr effect; Magneto-optics; Manganites; Ultrathin films