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 run 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.
Decrease of the Curie temperature of La0.67Sr0.33MnO3 thin films covered by gold layers / S., Brivio; M., Cantoni; D., Petti; A., Cattoni; R., Bertacco; M., Finazzi; F., Ciccacci; A., Sidorenko; Allodi, Giuseppe; Ghidini, Massimo; DE RENZI, Roberto. - In: MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY. - ISSN 0921-5107. - 144:(2007), pp. 93-96. [10.1016/j.mseb.2007.07.084]
Decrease of the Curie temperature of La0.67Sr0.33MnO3 thin films covered by gold layers
ALLODI, Giuseppe;GHIDINI, Massimo;DE RENZI, Roberto
2007-01-01
Abstract
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 run 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
