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Phys. Rev. B 42, 8110–8120 (1990)

[Issue 13 – 1 November 1990 ]

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Novel magnetoresistance effect in layered magnetic structures: Theory and experiment

J. Barnas, A. Fuss, R. E. Camley, P. Grünberg, and W. Zinn

Kernsforschungsanlage GmbH, Institut für Festkörperforschung, Postfach 1913, 5170 Jülich, West Germany

We study magnetoresistivity in ferromagnetic-nonmagnetic multilayers both theoretically and experimentally. The theoretical approach uses a Boltzmann equation with spin-dependent bulk and interface scattering. We show that the resistivity increases when the magnetizations of the ferromagnetic films rotate from the parallel alignment to the antiparallel one. Bulk and interface contributions are studied numerically as a function of the electron mean free path and film thickness, and we show that these two effects produce characteristically different results. Experimentally we investigated both epitaxial and polycrystalline (Fe/Cr)_n/Fe multilayers with n=1, 2, and 4. In this system the antiparallel alignment is achieved by an antiferromagnetic coupling between the Fe layers across the Cr interlayer. We also found large magnetoresistance effects in Co/Au/Co structures where the antiparallel alignment of the Co magnetizations was obtained by different coercive fields in the two Co films. A detailed comparison of the theoretical and experimental results for epitaxial Fe/Cr structures shows good agreement.

©1990 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v42/p8110
DOI: 10.1103/PhysRevB.42.8110
PACS: 75.50.Rr, 72.15.Gd, 75.70.Cn

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References

1. M. R. Khan, C. S. L. Chun, G. P. Felcher, M. Grimsditch, A. Kueny, C. M. Falco and I. K. Schuller, Phys. Rev. B 27, 7186 (1983).
2. P. F. Garcia and A. Suna, J. Appl. Phys. 54, 2000 (1983) [ SPIN][ INSPEC].
3. R. Dimmich, J. Phys. F 15, 2477 (1985).
4. M. Gurwitch, Phys. Rev. B 34, 540 (1986).
5. Chu-Xing Chen, Appl. Phys. A 40, 37 (1986); 42, 145 (1987).
6. J. W. C. de Vries, Solid State Commun. 65, 201 (1988).
7. J. W. C. de Vries and F. J. A. den Broeder, J. Phys. F 18, 2635 (1988).
8. M. T. Perez-Frias and J. L. Vicent, Phys. Rev. B 38, 9503 (1988).
9. M. Jal-strokeochowski and E. Bauer, Phys. Rev. B 37, 8622 (1988).
10. T. Kaneko, T. Sasaki, M. Sakuda, R. Yamamoto, T. Nakamura, H. Yamamoto and S. Tanaka, J. Phys. F 18, 2053 (1988).
11. G. Reiss, K. Kapfberger, G. Meier, J. Vancea and H. Hoffmann, J. Phys. Condens. Matter 1, 1275 (1989) [ INSPEC].
12. C. Dupas, J. P. Renard, J. Seiden, E. Velu and D. Renard, J. Appl. Phys. 63, 4300 (1988) [ SPIN][ INSPEC].
13. E. Velu, C. Dupas, D. Renard, J. P. Renard and J. Seiden, Phys. Rev. B 37, 668 (1988).
14. M. N. Baibich, J. M. Broto, A. Fert, F. Nguyen Van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich and J. Chazelas, Phys. Rev. Lett. 61, 2472 (1988).
15. G. Binasch, P. Grünberg, F. Saurenbach and W. Zinn, Phys. Rev. B 39, 4828 (1989).
16. F. Saurenbach, J. Barnas, G. Binasch, M. Vohl, P. Grünberg and W. Zinn, Thin Solid Films 175, 317 (1989) [ INSPEC]; the work of J. J. Krebs, P. Lubitz, A. Chaiken, and G. A. Printz [Phys. Rev. Lett. 63, 1645 (1989)] shows a slightly different thickness range for antiferromagnetic coupling, i.e., 13–25 Å
17. M. Kitada and N. Shimizu, Thin Solid Films 158, 167 (1988) [ INSPEC].
18. J. A. J. Lourens, S. Arajs, H. F. Helbig, L. Cheriet and El-Sayed A. Mehanna, J. Appl. Phys. 63, 4282 (1988) [ SPIN][ INSPEC].
19. E. Dan Dahlberg, K. Riggs and G. A. Prinz, J. Appl. Phys. 63, 4270 (1988) [ SPIN][ INSPEC].
20. M. Rubinstein, F. J. Rachford, W. W. Fuller and G. A. Prinz, Phys. Rev. B 37, 8689 (1988).
21. P. Grünberg, R. Schreiber, Y. Pang, M. B. Brodsky and H. Sowers, Phys. Rev. Lett. 57, 2442 (1986).
22. F. Saurenbach, U. Walz, L. Hinchey, P. Grünberg and W. Zinn, J. Appl. Phys. 63, 3473 (1988) [ SPIN][ INSPEC].
23. G. G. Cabrera and L. M. Falicov, Phys. Status Solidi B 61, 539 (1974) [ INSPEC]; and, 62, 217 (1974) [ INSPEC].
24. R. E. Camley and J. Barnas, Phys. Rev. Lett. 63, 664 (1989).
25. K. Fuchs, Proc. Cambridge Philos. Soc. 34, 100 (1938).
26. H. Sondheimer, Adv. Phys. 1, 1 (1952).
27. A. Fert and I. A. Campbell, J. Phys. F 6, 849 (1976); for a review, see also I. A. Campbell and A. Fert, in Ferromagnetic Materials, edited by E. P. Wohlfarth (North-Holland, Amsterdam, 1982) Vol. 3, p. 747.
28. R. E. Camley and D. R. Tilley, Phys. Rev. B 37, 3412 (1988).
29. Z. Tesanovic, M. V. Jaric and S. Maekawa, Phys. Rev. Lett. 57, 2760 (1986).
30. N. Trivedi and N. W. Ashcroft, Phys. Rev. B 38, 12298 (1988).

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