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HCP-FCC Transition in Epitaxial Co-Cu Superlattices

Published online by Cambridge University Press:  03 September 2012

F. J. Lamelas ,
C. H. Lee ,
Hui He ,
W. Vavra  and
Roy Clarke
F. J. Lamelas
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, MI 48109
C. H. Lee
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, MI 48109
Hui He
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, MI 48109
W. Vavra
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, MI 48109
Roy Clarke
Affiliation:
Department of Physics, The University of Michigan, Ann Arbor, MI 48109
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Abstract

A series of epitaxial Co-Cu superlattices has been grown on GaAs (110) substrates by molecular beam epitaxy. Detailed analysis of x-ray diffuse scattering scans along Co (101ℓ) reveals a crossover from from the bulk hcp phase of Co to metastable fcc stacking. Our measurements indicate a strong correlation between structural symmetry and the magnetic anisotropy in Co - noble metal superlattices. In particular, the perpendicular easy axis of magnetization onsets at Co layer thickness ♣ 19 Å in Cohcp -Au compared to only ˜11 Å in Cofcc -Cu.

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References

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