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

Appl. Phys. Lett. 79, 1655 (2001); doi:10.1063/1.1404125

Issue Date: 10 September 2001

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M. Bowen, V. Cros, F. Petroff, and A. Fert
Unité Mixte de Physique CNRS-THALES, Domaine de Corbeville, 91404 Orsay Cedex, France
Université Paris Sud, 91405 Orsay Cedex, France

C. Martínez Boubeta, J. L. Costa-Krämer, J. V. Anguita, A. Cebollada, and F. Briones
Instituto de Microelectrónica de Madrid-IMM (CNM-CSIC), Isaac Newton 8-PTM, 28760 Tres Cantos, Madrid, Spain

J. M. de Teresa, L. Morellón, and M. R. Ibarra
Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Facultad de Ciencias, 50009 Zaragoza, Spain

F. Güell, F. Peiró, and A. Cornet
Electronic Materials and Engineering, Facultat de Fisica, Universitat de Barcelona Av. Diagonal 645-647, E-08028 Barcelona, Spain
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-Al2O3/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.
History: Received 19 February 2001; accepted 30 July 2001
Permalink: http://link.aip.org/link/?APPLAB/79/1655/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Pa
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Giant magnetoresistance
  • 75.70.Cn
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Interfacial magnetic properties (multilayers, superlattices)
  • 73.40.Gk
    Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures Electronic transport in interface structures Tunneling
  • YEAR: 2001

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0003-6951 (print)   1077-3118 (online)
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