Andreev experiments on superconductor/ferromagnet point contacts

Andreev reflection is a smart tool to investigate the spin polarization P of the current through point contacts between a superconductor and a ferromagnet. We compare different models to extract P from experimental data and investigate the dependence of P on different contact parameters.

PACS: 72.25.Ba Spin polarized transport in metals;
PACS: 73.23.–b Electronic transport in mesoscopic systems;
PACS: 73.63.Rt Nanoscale contacts;
PACS: 74.78.Na Mesoscopic and nanoscale systems;
PACS: 81.07.Lk Nanocontacts.

References

1. I. K. Yanson, Zh. Eksp. Teor. Fiz. 66, 1035 (1974) I. K. Yanson, [Sov. Phys. JETP 39, 506 (1974)]. CAS Google Scholar

2. For an overview, see Yu. G. Naidyuk and I. K. Yanson, Point-Contact Spectroscopy (Springer, New York, 2005). Google Scholar

3. Y. V. Sharvin, Zh. Eksp. Teor. Fiz. 48, 984 (1965) Y. V. Sharvin, [Sov. Phys. JETP 21, 655 (1965)]. Google Scholar

4. G. Wexler, Proc. Phys. Soc. 89, 927 (1966). CrossRef Google Scholar

5. J. Gramich, P. Brenner, C. Sürgers, H. v. Löhneysen, and G. Goll, Phys. Rev. B 86, 155402 (2012). CrossRef Google Scholar

6. For a review, see G. Goll, Unconventional Superconductivity, Springer Tracts in Modern Physics, Vol. 214 (Springer, 2005). Google Scholar

7. A. F. Andreev, Sov. Phys. JETP 19, 1228 (1964). CAS Google Scholar

8. A. Zaitsev, Sov. Phys. JETP 51, 111 (1980). Google Scholar

9. G. E. Blonder, M. Tinkham, and T. M. Klapwijk, Phys. Rev. B 25, 4515 (1982). CrossRef Google Scholar

10. R. J. Soulen, Jr., J. M. Byers, M. S. Osofsky, B. Nadgorny, T. Ambrose, S. F. Cheng, P. R. Broussard, C. T. Tanaka, J. Nowak, J. S. Moodera, A. Barry, and J. M. D. Coey, Science 282, 85 (1998). CrossRef Google Scholar

11. S. K. Upadhyay, A. Palanisami, R. N. Louie, and R. A. Buhrman, Phys. Rev. Lett. 81, 3247 (1998); CrossRef Google Scholar

12. G. Prinz, Phys. Today 48, 58 (1995). CrossRef Google Scholar

13. G. Busch, M. Campagna, and H. C. Siegmann, Phys. Rev. B 4, 746 (1971). CrossRef Google Scholar

14. R. Meservey and P. M. Tedrow, Phys. Rep. 238, 173 (1994). CrossRef Google Scholar

15. M. J. M. Jong and C. W. J. Beenakker, Phys. Rev. Lett. 74, 1657 (1995). CrossRef Google Scholar

16. I. I. Mazin, Phys. Rev. Lett. 83, 1427 (1999). CrossRef Google Scholar

17. K. Xia, P. J. Kelly, G. E. W. Bauer, and I. Turek, Phys. Rev. Lett. 89, 166603 (2002). CrossRef Google Scholar

18. B. Nadgorny, R. J. Soulen, Jr., M. S. Osofsky, I. I. Mazin, G. Laprade, R. J. M. van de Veerdonk, A. A. Smits, S. F. Cheng, E. F. Skelton, and S. B. Qadri, Phys. Rev. B 61, R3788 (2000). CrossRef Google Scholar

19. Y. Ji, G. J. Strijkers, F. Y. Yang, C. L. Chien, J. M. Byers, A. Anguelouch, G. Xiao, and A. Gupta, Phys. Rev. Lett. 86, 5585 (2001). CrossRef Google Scholar

20. P. Raychaudhuri, A. P. Mackenzie, J. W. Reiner, and M. R. Beasley, Phys. Rev. B 67, R020411 (2003). Google Scholar

21. J. S. Parker, S. M. Watts, P. G. Ivanov, and P. Xiong, Phys. Rev. Lett. 88, 196601 (2002). CrossRef Google Scholar

22. F. Pérez-Willard, J. C. Cuevas, C. Sürgers, P. Pfundstein, J. Kopu, M. Eschrig, and H. v. Löhneysen, Phys. Rev. B 69, 140502–R) (2004). CrossRef Google Scholar

23. M. Stokmaier, G. Goll, D. Weissenberger, C. Sürgers, and H. v. Löhneysen, Phys. Rev. Lett. 101, 147005 (2008). CrossRef Google Scholar

24. G. J. Strijkers, Y. Ji, F. Y. Yang, C. L. Chien, and J. M. Byers, Phys. Rev. B 63, 104510 (2001). CrossRef Google Scholar

25. I. I. Mazin, A. A. Golubov, and B. Nadgorny, J. Appl. Phys. 89, 7576 (2001). CrossRef Google Scholar

26. A. Martin-Rodero, A. Levy Yeyati, and J. C. Cuevas, Physica C 353, 67 (2001). Google Scholar

27. G. T. Woods, R. J. Soulen, Jr., I. Mazin, B. Nadgorny, M. S. Osofsky, J. Sanders, H. Srikanth, W. F. Egelhoff, and R. Datla, Phys. Rev. B 70, 054416 (2004). CrossRef Google Scholar

28. P. Chalsani, S. K. Upadhyay, O. Ozatay, and R. A. Buhrman, Phys. Rev. B 75, 094417 (2007). CrossRef Google Scholar

29. W. Buckel and R. Kleiner, Superconductivity (Wiley-VCH, Weinheim, 2004). Google Scholar

30. R. C. Dynes, J. P. Garno, G. B. Hertel, and T. P. Orlando, Phys. Rev. Lett. 53, 2437 (1984). CrossRef Google Scholar

31. Details of the preparation can be found in Refs. 22 and 32. Google Scholar

32. K. S. Ralls, R. A. Buhrman, and R. C. Tiberio, Appl. Phys. Lett. 55, 2459 (1989). CrossRef Google Scholar