Issue |
Europhys. Lett.
Volume 57, Number 6, March 2002
|
|
---|---|---|
Page(s) | 866 - 871 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2002-00590-3 | |
Published online | 01 August 2002 |
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: micklitz@ph2.uni-koeln.de
Received:
8
October
2001
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
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