Strongly enhanced tunneling magnetoresistance in granular films of clusters in a matrix: Evidence for a cluster-surface/matrix interaction
II. Physikalisches Institut, Universität zu Köln
Zülpicher Str. 77, 50937 Köln, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 7 January 2002
A new granular system, namely, clusters embedded in solid , has been prepared by the co-deposition of well-defined clusters (mean diameter , and molecules onto a cold substrate. This system shows a temperature-dependent tunneling magnetoresistance (TMR) which has a value of 31(2)% at 2.5. Using Jullière's model this value corresponds to a spin-polarisation |P| = 0.68(2) of the tunneling electrons, compared to P = 0.42 for granular or planar . We interpret this enhancement of P as caused by a cluster-surface/matrix interaction.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 73.40.Gk – Tunneling / 73.40.Rw – Metal-insulator-metal structures
© EDP Sciences, 2002