# name
Tunneling magnetoresistance in Co-ZrO2 granular thin films

# metadata.dc.description.abstract[].value
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.

# metadata.dc.relation.isformatof[].value
Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.73.045418

# metadata.dc.source[].value
Articles publicats en revistes (Física Aplicada)

# metadata.dc.title[].value
Tunneling magnetoresistance in Co-ZrO2 granular thin films