TITLE

Large magnetoresistance in Fe/MgO/FeCo(001) epitaxial tunnel junctions on GaAs(001)

AUTHOR(S)
Bowen, M.; Cros, V.; Petroff, F.; Fert, A.; Martı´nez Boubeta, C.; Costa-Kra¨mer, J. L.; Anguita, J. V.; Cebollada, A.; Briones, F.; de Teresa, J. M.; Morello´n, L.; Ibarra, M. R.; Gu¨ell, F.; Peiro´, F.; Cornet, A.
PUB. DATE
September 2001
SOURCE
Applied Physics Letters;9/10/2001, Vol. 79 Issue 11
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present tunneling experiments on Fe(001)/MgO(20 Å)/FeCo(001) single-crystal epitaxial junctions of high quality grown by sputtering and laser ablation. Tunnel magnetoresistance measurements give 60% at 30 K, to be compared with 13% obtained recently on (001)-oriented Fe/amorphous-Al[sub 2]O[sub 3]/FeCo tunnel junctions. This difference demonstrates that the spin polarization of tunneling electrons is not directly related to the density of states of the free metal surface—Fe(001) in this case—but depends on the actual electronic structure of the entire electrode/barrier system. © 2001 American Institute of Physics.
ACCESSION #
5113209

 

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