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Interfacial Mixing in Epitaxial Co/Pt Superlattices: a Source of Magnetocrystalline Anisotropy

Published online by Cambridge University Press:  15 February 2011

R. F. C. Farrow ,
B. D. Hermsmeier ,
C. H. Lee ,
R. F. Marks ,
E. E. Marinero ,
C. J. Lin ,
C. J. Chien  and
S. B. Hagstrom
R. F. C. Farrow
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
B. D. Hermsmeier
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
C. H. Lee
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
R. F. Marks
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
E. E. Marinero
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
C. J. Lin
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose CA 95120–6099.
C. J. Chien
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305–2205.
S. B. Hagstrom
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305–2205.
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Abstract

We report the results of photoelectron forward scattering studies of Co-Pt interfaces during the growth of epitaxial superlattices by MBE. These studies reveal that the interfaces are not atomically abrupt but exhibit limited interdiffusion. The dependence of magnetic anisotropy on growth axis and the strong 2-fold in-plane anisotropy for [110] oriented superlattices suggests that magnetocrystalline anisotropy is a major factor in determining the anisotropy in Co/Pt superlatticcs. The possibility that this anisotropy may arise from a combination of structural defects and local ordering is discussed.

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