Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/10648
Tunneling magnetoresistance in Co-ZrO2 granular thin films
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
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.
Matèries (anglès)
Citació
Citació
HATTINK, Bart jan, GARCÍA DEL MURO Y SOLANS, Montserrat, KONSTANTINOVIĆ, Zorica, BATLLE GELABERT, Xavier, LABARTA, Amílcar. Tunneling magnetoresistance in Co-ZrO2 granular thin films. _Physical Review B_. 2006. Vol. 73, núm. 4, pàgs. 045418-1-045418-9. [consulta: 30 de gener de 2026]. ISSN: 0163-1829. [Disponible a: https://hdl.handle.net/2445/10648]