期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 19, 期 16, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/19/16/165201
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A brief theoretical review points out the specific aspects of electronic transport in single-crystal magnetic tunnel junctions employing bcc( 100) Fe electrodes and a MgO( 100) insulating barrier. The theoretical predictions are compared to the experimental reality in both equilibrium and out-of-equilibrium regimes. For extremely small MgO thickness, we illustrate that the equilibrium tunnel transport in Fe/MgO/Fe systems leads to antiferromagnetic interactions. Artificial antiferromagnetic systems based on coupling by spin polarized tunnelling have been elaborated and studied. In the out-of-equilibrium regime and for large MgO barrier thickness, the tunnel transport validates specific spin filtering effects in terms of symmetry of the electronic Bloch function and symmetry-dependent wavefunction attenuation in the single-crystal barrier. Within this framework, we explain the experimental giant tunnel magnetoresistive effects at room temperature, up to 180%, measured in our simple or double barrier tunnel junction systems. Moreover, we illustrate that the magneto-transport properties of the junctions may be skilfully engineered by adjusting the interfacial chemical and electronic structure.
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