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                    Phys. Rev. B 48, 17538–17544 (1993)

                       [Issue 23 – 15 December 1993 ]

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Unusual stability of fcc Co(110)/Cu(110)

     G. R. Harp, R. F. C. Farrow, D. Weller, T. A. Rabedeau, and R. F.
     Marks
     IBM Almaden Research Center, 650 Harry Road, San Jose, California
     95120-6099

Received 23 July 1993

It is found that thick (1000 Å) films of fcc Co can be stabilized via
epitaxial growth onto Cu(110) substrates at room temperature. These
metastable films transform into polycrystalline films of the stable hcp
phase if annealed to temperatures above 200 °C. The unusual stability of
the fcc phase in the (110) growth direction is linked with the fact that
the phase transformation to hcp involves a major disruption of the crystal
structure, compared with, e.g., growth of fcc Co on Cu(111). The
stabilization of single-crystal fcc Co at room temperature has enabled
measurements of the room temperature magnetic properties in these films,
for comparison with hcp Co.

©1993 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v48/p17538
DOI: 10.1103/PhysRevB.48.17538
PACS: 61.14.Rq, 68.55.Bd, 75.70.Ak
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References

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  1. J. Thomassen, B. Feldmann and M. Wuttig, Surf. Sci. 264, 406 (1992) [
     [dot] INSPEC].
  2. B. P. Tonner, Z. L. Han, and J. Zhang, Phys. Rev. B (to be published).
  3. G. A. Prinz, Phys. Rev. Lett. 54, 1051 (1985).
  4. G. R. Harp, R. F. C. Farrow, R. F. Marks and J. E. Vazquez, J. Cryst.
     Growth 127, 627 (1993) [[dot] INSPEC].
  5. R. F. C. Farrow, G. R. Harp, R. F. Marks, T. A. Rabedeau, M. F. Toney,
     D. Weller, and S. S. P. Parkin, J. Cryst. Growth (to be published).
  6. K. Sano and T. Miyagawa, Appl. Surf. Sci. 60/61, 813 (1992).
  7. F. Herman, P. Lambin and O. Jepsen, Phys. Rev. B 31, 4394 (1985).
  8. For recent reviews of diffuse electron diffraction, see C. F. Fadley,
     in Synchrotron Radiation Research: Advances in Surface Science, edited
     by R. Z. Bachrach (Plenum Press, New York, 1990); W. F. Egelhoff, Jr.,
     ., Crit. Rev. Solid State Mater. Sci. 16, 213 (1990) [[dot] INSPEC];
     S. A. Chambers, Adv. Phys. 40, 357 (1991) [[dot] INSPEC].
  9. Note that XPD, which is sensitive to the outer approx20 AA, of the Co
     film, is not sensitive to the reconstruction of the surface layer seen
     in LEED.
 10. B. D. Cullity, Introduction to Magnetic Materials (Addison Wesley,
     Reading, 1972), pp. 227 and 228.
 11. Anisotropy constants may be extracted from the loop data of Fig.
     refkerr, according to Eq. ( refloopeq). Setting Ms=1422 kA/m we obtain
     the values K1 = 0.35 MJ/m3 and K2 = 0.16 MJ/m3 for Co(11bar20), and K1
     = 0.26 MJ/m3 and K2 = 0.01 MJ/m3 for Co(0001). These anisotropy
     constants should ideally be identical, and equal to those of bulk hcp
     Co: K1=0.450 and K2=0.15 MJ/m3 (Ref. onlinecitecullity). Departures
     from bulk anisotropy are probably due to structural imperfections
     present in these films: fcc like stacking faults in the (0001) film,
     and grain boundary disorder in the twinned (11bar20) film, both of
     which are observed in the x ray diffraction. Following Eq. (3), we
     find K1 = - 0.8 MJ/m3 for fcc Co.
 12. G. R. Harp and D. Weller (unpublished).
 13. G. R. Harp, D. Weller, T. Rabedeau, R. F. C. Farrow and M. F. Toney,
     Phys. Rev. Lett. 71, 2493 (1993).
 14. Z. Nishiyama, Tohoku Sci. Rep. 25, 79 (1936).
 15. J. H. Van Der Merwe, J. Appl. Phys. 34, 123 (1963).
 16. W. A. Jesser and D. Kuhlmann Wilsdorf, Phys. Status Solidi 19, 95
     (1967).
 17. R. Bruinsma and A. Zangwill, J. Phys. (Paris) 47, 2055
     (1986) [[dot] INSPEC].
 18. V. L. Moruzzi, P. M. Marcus, K. Schwartz and P. Mohn, J. Magn. Magn.
     Mater. 54 57, 955 (1986).

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