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Phys. Rev. Lett. 69, 3678–3681 (1992)

[Issue 25 – 21 December 1992 ]

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Spin polarization of epitaxial Cr on Fe(001) and interlayer magnetic coupling in Fe/Cr multilayered structures

Zhu–Pei Shi and Peter M. Levy

Department of Physics, New York University, 4 Washington Place, New York, NY 10003

John L. Fry

Department of Physics, University of Texas at Arlington, Arlington, Texas 76019

Interlayer coupling in metallic multilayer is generally thought to be akin to the RKKY coupling of magnetic moments through conduction electrons. By analyzing recent experimental data on the spin polarization of chromium on iron substrates we confirm that the RKKY coupling cannot by itself explain the interlayer coupling in Fe/Cr multilayers. An additional coupling is warranted by the data, and we explain its origin.

©1992 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v69/p3678
DOI: 10.1103/PhysRevLett.69.3678
PACS: 75.50.Rr, 73.20.Dx, 75.30.Et

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References

1. T.G. Walker, A.W. Pang, H. Hopster and S.F. Alvarado, Phys. Rev. Lett. 69, 1121 (1992).
2. J. Unguris, R.J. Celotta and D.T. Pierce, Phys. Rev. Lett. 69, 1125 (1992).
3. S. Demokritov, J.A. Wolf, P. Grünberg, and W. Zinn, in Magnetic Surfaces, Thin Films and Multilayers, edited by S.S.P. Parkin et al., MRS Symposia Proceedings No. 231 (Materials Research Society, Pittsburgh, 1992), p. 133.
4. J. Unguris, R.J. Celotta and D.T. Pierce, Phys. Rev. Lett. 67, 140 (1991); S.T. Purcell et al., Phys. Rev. Lett. 67, 903 (1991).
5. C.E.T. Goncalves da Silva and L. M. Falicov, J. Phys. C 5, 63 (1972).
6. Y. Wang, P.M. Levy and J.L. Fry, Phys. Rev. Lett. 65, 2732 (1990); J.L. Fry, E.C. Ethridge, P.M. Levy and Y. Wang, J. Appl. Phys. 69, 4780 (1991); P.M. Levy, J.L. Fry, and E.C. Ethridge, in Magnetic Surfaces, Thin Films and Multilayers / (Ref. [3]), p. 189.
7. B. Caroli, J. Phys. Chem. Solids 28, 1427 (1967).
8. P.W. Anderson, Phys. Rev. 124, 41 (1961).
9. P. Jena and D.J.W. Geldart, Phys. Rev. B 7, 439 (1973).
10. J. Callaway {et al.}, Phys. Rev. B 28, 3818 (1983).
11. When considering a sheet of magnetic impurities E_h represents a two dimensional band of states [C. Lacroix and J.P. Gavigan, J. Magn. Magn. Mater. 93, 413 (1991); Ref. 17,]. We have modeled this case by considering several values for E_h, and find that this dispersion in E_h does not alter the conclusions we come to in this Letter.
12. Y. Yafet, Phys. Rev. B 36, 3948 (1987).
13. E. Fawcett, Rev. Mod. Phys. 60, 209 (1988).
14. There is a very large exchange enhancement occurring at q_SDW in Cr; this may / produce relatively large shifting of the phase slip regions. Calculations [K. Schwartzman and J.L. Fry, J. Phys. Condens. Matter 2, 9085 (1990); K. Schwartzman, E.J. Hartford and J.L. Fry, J. Appl. Phys. 6 7, 4552 (1990)] of the many body enhancements to the random phase approximation for susceptibility of Cr show that enhancements are a strong function of q, with very large enhancements occurring near q_SDW. In fact at q_SDW and below T_N the enhancements are singular, but above T_N they also remain strong up to T=2T_N.
15. Q. Zhang and P.M. Levy, Phys. Rev. B 34, 1884 (1986).
16. C. Proetto and A. López, Phys. Rev. B 25, 7037 (1982).
17. P. Bruno, J. Magn. Magn. Mater. 116, L13 (1992).

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