Structural characterization and magnetoresistance of manganates thin films and Fe-doped manganates thin films

Stela Canulescu, Th. Lippert, H. Grimmer, A. Wokaun, R. Robert, D. Logvinovich, A. Weidenkaff, A. Doebeli

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Abstract

Perovskites thin films with the composition La0.6Ca0.4MnO3 doped with 20% Fe, were prepared by pulsed reactive crossed beam laser ablation, where a synchronized reaction gas pulse interacts with the ablation plume. The films were grown on various substrates and the highest colossal magnetoresistance ratio (CMR) was detected by Hall measurements for films grown on LaA1O(3) (1 0 0), which was selected as substrate for further investigations.Several growth parameters, such as substrate temperature and target to substrate distance were varied to analyze their influence on the film properties.The structure of the deposited thin films was characterized by X-ray diffraction and atomic force microscope, while Rutherford backscattering (RBS) was used to determine the film stoichiometry. The electrical properties were determined by Hall effect measurements in a magnetic field of 0.51 T.These measurements reveal that the amplitude of the CMR ratio depends strongly on the substrate and that the oxygen content influences the temperature where the transition from semiconductor to metal is observed.
Original languageEnglish
JournalApplied Surface Science
Volume252
Issue number13
Pages (from-to)4599-4603
ISSN0169-4332
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventEuropean Materials Research Society Spring 2005 meeting - Palais des Congres, Strasbourg, France
Duration: 31 May 20053 Jun 2005

Conference

ConferenceEuropean Materials Research Society Spring 2005 meeting
LocationPalais des Congres
CountryFrance
CityStrasbourg
Period31/05/200503/06/2005

Bibliographical note

Part of special issue: Proceedings of the European Materials Research society 2005 - Symposium-J: Advances in Laser and Lamp Processing of Functional Materials: EMRS 2005 Symposium J

Keywords

  • Magnetoresistance
  • Manganates thin films
  • Fe-doped manganates thin films
  • Pulsed laser deposition

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