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Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions

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González Herrera, Elvira María and Folgueras, A. D. and Escudero, R. and Ferrer, J.M. and Guinea, F. and Vicent López, José Luis (2007) Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions. New journal of physics, 9 . ISSN 1367-2630

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Official URL: http://dx.doi.org/10.1088/1367-2630/9/2/034


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Abstract

We have measured the tunnelling current in Nb/Nb_xO_y/Ni planar tunnel junctions at different temperatures. The junctions are in the intermediate transparency regime. We have extracted the current polarization of the metal/ferromagnet junction without applying a magnetic field. We have used a simple theoretical model, that provides consistent fitting parameters for the whole range of temperatures analysed. We have also been able to gain insight into the microscopic structure of the oxide barriers of our junctions.


Item Type:Article
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© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
We thank very useful discussions with J Moodera, M Eschrig and M Fogelstrom. This study was supported by MEC (FIS2005-0739, NAN2004-09087, MAT2005-23924E, MAT2002-0495-C02-01, BFM2003-03156), CAM (S-0505/ESP/0337) and Santander-UCM. Additionally, RE thanks Universidad Complutense and Ministerio de Educación y Ciencia for a sabbatical professorship. AD-F thanks Ministerio de Educación y Ciencia for a FPU grant (AP2002-1383).

Uncontrolled Keywords:Superlattices; Reflection
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:43400
Deposited On:23 Jun 2017 13:51
Last Modified:26 Jun 2017 08:01

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