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Surface behavior of La2/3Ca1/3MnO3 epitaxial thin films
Abad Muñoz, Llibertat (Institut de Ciència de Materials de Barcelona)
Martínez Perea, Benjamín (Institut de Ciència de Materials de Barcelona)
Balcells Argemí, Lluís (Institut de Ciència de Materials de Barcelona)
American Physical Society

Date: 2005
Abstract: The role of the surface layers in La2/3Ca1/3MnO3 magnetic oxide epitaxialthin films is analyzed. We show that the topmost layers do play a very relevant role on the transport properties acting as an insulating barrier. Atomic force microscopy(AFM)measurements in the current sensing mode exhibit typical features of tunneling conduction. The analysis of the I-V curves by using the Simmons model give values of barrier thickness in good agreement with nonmagnetic layer thickness estimates from magnetic measurements. Ex situannealing in air at high temperature clearly improve the magnetotransport properties of the films reducing the surface insulating barrier.
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; publishedVersion
Subject: Annealing ; Transport properties ; Atomic force microscopy ; Contact resistance ; Insulator surfaces ; Magnetic films ; Tunneling ; Electric measurements ; Epitaxy
Published in: Applied Physics Letters, Vol. 87, Issue 21 (November 2005) , p. 212502, ISSN 1077-3118

DOI: 10.1063/1.2133925

4 p, 503.7 KB

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 Record created 2014-02-28, last modified 2019-02-03

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