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Ferromagnetism of La0.67Sr0.33MnO3 is extremely sensitive to external perturbations like substrate-induced strain, charge injection and chemical interactions with neighbour layers. In this paper we discuss the perturbation induced by the presence of a metallic overlayer, typically deposited for electric contacts, in the prototypical case of the Au/La0.67Sr0.33MnO3 interface. In particular we found a sizable decrease of the Curie temperature in thin films of La0.67Sr0.33MnO3 after gold capping: 65 K for 5 nm thickness of the manganite. Apart from chemical reactions at the interface, charge injection–depletion induced by the difference in the work function between Au and La0.67Sr0.33MnO3 could partially explain this phenomenon.
Publication date: 
25 Nov 2007

Stefano Brivio, Matteo Cantoni, Daniela Petti, Andrea Cattoni, Riccardo Bertacco, Marco Finazzi, Franco Ciccacci, A Sidorenko, G Allodi, M Ghidini, R De Renzi

Biblio References: 
Volume: 144 Issue: 1-3 Pages: 93-96
Materials Science and Engineering: B