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

AuthorsBowen, M.; Cros, Vicent; Petroff, F.; Fert, A.; Martínez Boubeta, Carlos ; Costa Krämer, José Luis ; Anguita, José Virgilio ; Cebollada, Alfonso ; Briones Fernández-Pola, Fernando ; Teresa, José María de; Morellón, L.; Ibarra, M. R.; Güell, F.; Peiró, F.; Cornet, A.
Magnesium compounds
Iron alloys
Cobalt alloys
Magnetic epitaxial layers
Magnetic multilayers
Giant magnetoresistance
Issue Date10-Sep-2001
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 79, 1655 (2001)
AbstractWe 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
Appears in Collections:(IMN-CNM) Artículos
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