Spin-polarized transport in F/S nanojunctions

Taddei, F and Sanvito, S and Lambert, C. J. (2001) Spin-polarized transport in F/S nanojunctions. Journal of Low Temperature Physics, 124 (1-2). pp. 305-320. ISSN 0022-2291

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Abstract

We study spin-dependent electronic transport across ferromagnet/superconductor ballistic junctions modeled using tight-binding Hamiltonians with s, p and d orbitals and material-specific parameters. The first result of this paper is that, by accurately modeling the band structure of the bulk materials, one can reproduce the measured differential conductance of Cu/Pb nanocontacts(1,2). In contrast the differential conductance of Co/Pb contacts can only be reproduced if an enhanced magnetic moment is present at the interface. The second result concerns the reliability of a method proposed in Refs. 1-3 for determining the degree of polarization of a ferromagnet. By fitting the material-specific differential conductance curves to curves calculated using a single-band model we show that this method does not yield reliable values for polarization and spin-dependent transmission.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Low Temperature Physics
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
577
Deposited By:
Deposited On:
04 Jul 2007
Refereed?:
Yes
Published?:
Published
Last Modified:
07 Jan 2020 02:53