Volume 84, Number 5, December 2008
Article Number 57008
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 10 December 2008
EPL, 84 (2008) 57008
DOI: 10.1209/0295-5075/84/57008

Proximity-effect–assisted decay of spin currents in superconductors

J. P. Morten1, 2, A. Brataas1, 2, G. E. W. Bauer2, 3, W. Belzig2, 4 and Y. Tserkovnyak2, 5

1   Department of Physics, Norwegian University of Science and Technology - NO-7491 Trondheim, Norway
2   Centre for Advanced Study at the Norwegian Academy of Science and Letters Drammensveien 78, NO-0271 Oslo, Norway
3   Kavli Institute of NanoScience, Delft University of Technology - 2628 CJ Delft, The Netherlands, EU
4   Department of Physics, University of Konstanz - D-78457 Konstanz, Germany, EU
5   Department of Physics and Astronomy, University of California - Los Angeles, CA 90095, USA

received 20 June 2008; accepted in final form 28 October 2008; published December 2008
published online 10 December 2008

The injection of pure spin current into superconductors by the dynamics of a ferromagnetic contact is studied theoretically. Taking into account the suppression of the order parameter at the interfaces (inverse proximity effect) and the energy-dependence of spin-flip scattering, we determine the temperature-dependent ferromagnetic resonance linewidth broadening. Our results compare well with recent experiments in Nb|permalloy bilayers (BELL C. et al., Phys. Rev. Lett., 100 (2008) 047002).

74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
74.78.Na - Mesoscopic and nanoscale systems.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.

© EPLA 2008