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

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 tunne...

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Detalles Bibliográficos
Autores: Bowen, 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, Albert
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/25685
Acceso en línea:http://hdl.handle.net/10261/25685
Access Level:acceso abierto
Palabra clave:Iron
Magnesium compounds
Iron alloys
Cobalt alloys
Magnetic epitaxial layers
Magnetic multilayers
Giant magnetoresistance
Tunnelling
Descripción
Sumario: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.

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