Influence of Barrier Width on Spin-Polarisation Measured by Point Contact Andreev Reflection

  • P. Wójcik
  • A. Naylor
  • M. Wołoszyn
  • B. J. Hickey
  • B. J. Spisak
  • J. Adamowski
Open Access
Original Paper

Abstract

A modification of the Blonder–Tinkham–Klapwijk (BTK) model is proposed for the description of the ferromagnet-superconductor interface. Modelling the contact potential with a rectangular barrier, we investigate the influence of the barrier width at the interface on the value of spin polarisation measured by point contact Andreev reflection. Results suggesting that neglecting the width of the barrier at the interface can lead to an overestimation of the spin polarisation using the original BTK model are presented. This effect is particularly strong for low values of polarization and vanishes for high polarisation. The impact on analysis of the experimental data is also discussed.

Keywords

Point contact Andreev reflection Spin polarisation PCAR BTK theory 

References

  1. 1.
    Soulen, R.J., Byers, J.M., Osofsky, M.S., Nadgorny, B., Ambrose, T., Cheng, S.F., Broussard, P.R., Tanaka, C.T., Nowak, J., Moodera, J.S., Barry, A., Coey, J.M.D.: Science 282, 85 (1998) CrossRefADSGoogle Scholar
  2. 2.
    Upadhyay, S.K., Palanisami, A., Louie, R.N., Buhrman, R.A.: Phys. Rev. Lett. 81, 15 (1998) CrossRefGoogle Scholar
  3. 3.
    Boguslavsky, Y., Miyoshi, Y., Clowes, S.K., Branford, W.R., Lake, M., Brown, I., Caplin, A.D., Cohen, L.F.: Phys. Rev. B 71, 104523 (2005) CrossRefADSGoogle Scholar
  4. 4.
    Woods, G.T., Soulen, R.J.Jr., Mazin, I., Nadgorny, B., Osofsky, M.S., Sanders, J., Srikanth, H., Egelhoff, W.F., Datla, R.: Phys. Rev. B 70, 054416 (2004) CrossRefADSGoogle Scholar
  5. 5.
    Blonder, G.E., Tinkham, M., Klapwijk, T.M.: Phys. Rev. B 25, 4515 (1982) CrossRefADSGoogle Scholar
  6. 6.
    Mazin, I.I., Golubov, A.A., Nadgorny, B.: J. Appl. Phys. 89, 11 (2001) CrossRefGoogle Scholar
  7. 7.
    Strijkers, G.J., Ji, Y., Yang, F.Y., Chien, C.L.: Phys. Rev. B 63, 104510 (2001) CrossRefADSGoogle Scholar
  8. 8.
    de Gennes, P.G.: Superconductivity of Metals and Alloys. Benjamin, New York (2001) Google Scholar
  9. 9.
    Ji, Y., Strijkers, G.J., Yang, F.Y., Chien, C.L., Byers, J.M., Anguelouch, A., Xiao, Gang, Gupta, A.: Phys. Rev. Lett. 86, 24 (2001) Google Scholar
  10. 10.
    Nadgorny, B., Mazin, I.I., Osofsky, M., Soulen, R.J.Jr., Broussard, P., Stroud, R.M., Singh, D.J., Harris, V.G., Arsenov, A., Mukovskii, Ya.: Phys. Rev. B 63, 184433 (2001) CrossRefADSGoogle Scholar

Copyright information

© The Author(s) 2010

Authors and Affiliations

  • P. Wójcik
    • 1
    • 2
  • A. Naylor
    • 2
  • M. Wołoszyn
    • 1
  • B. J. Hickey
    • 2
  • B. J. Spisak
    • 1
  • J. Adamowski
    • 1
  1. 1.Faculty of Physics and Applied Computer ScienceAGH University of Science and TechnologyKrakówPoland
  2. 2.School of Physics and AstronomyUniversity of LeedsLeedsUK

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