Title of article :
Transport properties of pulsed laser deposited La0.67Sr0.33MnO3 thin films
Author/Authors :
M.C. Terzzoli، نويسنده , , D. Rubi، نويسنده , , S. Duhalde، نويسنده , , M. Villafuerte، نويسنده , , M. Sirena، نويسنده , , L. Steren، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Abstract :
La0.67Sr0.33MnO3 thin films have been prepared by pulsed laser deposition on (1 0 0) SrTiO3, (1 0 0) Si and YSZ/CeO2 buffered (1 0 0) Si substrates. Structural, electrical and magnetic characterisations were performed on each film, in order to put in evidence the grain boundaries effect in the magnetotransport properties. The films show a significant colossal magnetoresistance (CMR) effect near the Curie temperature. Textured and polycrystalline films show an additional magnetoresistance effect at low temperature originating on spin-polarised carriers tunnelling through grain boundaries or a non-ferromagnetic surface layer. The MR behaviour as a function of magnetic field and temperature shows that the suppression of magnetic fluctuations is the origin of the magnetoresistance in epitaxial films, while the intergrain effects dominate the MR in textured and polycrystalline films.
Keywords :
Pulsed laser deposition , Magnetoresistance , Thin film , Spin-polarised tunnelling
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science