Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10648
Title: Tunneling magnetoresistance in Co-ZrO2 granular thin films
Author: Hattink, Bart Jan
García del Muro y Solans, Montserrat
Konstantinovic, Zorica
Batlle Gelabert, Xavier
Labarta, Amílcar
Keywords: Superfícies (Física)
Superconductivitat
Pel·lícules fines
Surfaces (Physics)
Superconductivity
Thin films
Issue Date: 2006
Publisher: The American Physical Society
Abstract: Granular films composed of well defined nanometric Co particles embedded in an insulating ZrO2 matrix were prepared by pulsed laser depositon in a wide range of Co volume concentrations 0.15 x 0.43. High-resolution transmission electron microscopy TEM showed very sharp interfaces between the crystalline particles and the amorphous matrix. Narrow particle size distributions were determined from TEM and by fitting the low-field magnetic susceptibility and isothermal magnetization in the paramagnetic regime to a distribution of Langevin functions. The magnetic particle size varies little for Co volume concentrations x 0.32 and increases as the percolation limit is approached. The tunneling magnetoresistance TMR was successfully reproduced using the Inoue-Maekawa model. The maximum value of TMR was temperatureindependent within 50–300 K, and largely increased at low T, suggesting the occurrence of higher-order tunneling processes. Consequently, the tunneling conductance and TMR in clean granular metals are dominated by the Coulomb gap and the inherent particle size distribution.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.73.045418
It is part of: Physical Review B, 2006, vol. 73, núm. 4, p. 045418-1-045418-9
Related resource: http://dx.doi.org/10.1103/PhysRevB.73.045418
URI: http://hdl.handle.net/2445/10648
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Aplicada)
Articles publicats en revistes (Física de la Matèria Condensada)

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