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

Authors:Bowen, M.
Cros, V.
Petroff, F.
Fert, A.
Martínez Boubeta, C.
Costa Krämer, José Luis
Anguita, José Virgilio
Cebollada, Alfonso
Briones Fernández-Pola, Fernando
Teresa, J. M. de
Morellón, L.
Ibarra, M. R.
Güell, F.
Peiró, F.
Cornet, A.
Keywords:Iron, Magnesium compounds, Iron alloys, Cobalt alloys, Magnetic epitaxial layers, Magnetic multilayers, Giant magnetoresistance, Tunnelling
Issue Date:10-Sep-2001
Publisher:American Institute of Physics
Citation:Applied Physics Letters 79, 1655 (2001)
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-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.
Publisher version (URL):http://dx.doi.org/10.1063/1.1404125
URI:http://hdl.handle.net/10261/25685
ISSN:0003-6951
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Appears in Collections:(IMM-CNM) Artículos

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