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Observation of the Ordered CoPt3 Alloy in Co-Pt Multilayers

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Abstract

We report results of a synchrotron X-ray diffraction study of Co-Pt multilayers, with Pt[111] as the growth axis. The multilayers were grown by MBE on Pt seed films on basal-plane sapphire substrates at growth temperatures of 100 and 200°C.The multilayers comprised 15 periods of Co 3Å, Pt 15Å and both exhibited perpendicular anisotropy. Grazing-incidence radial- and phi-scans revealed a set of {110} peaks indicating doubling of real space periodicity consistent with the presence of the ordered alloy CoPt3. This supports the results of other studies which indicate interdiffused interfaces in Co-Pt multilayers and shows that chemical ordering can occur at much lower temperatures than in bulk alloys where annealing times of several days at ∼ 700°C are required to stimulate ordering.

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Authors and Affiliations

  1. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA, 95120-6099

    M.F. Toney, R.F.C. Farrow, R.F. Marks, G. Harp & T.A. Rabedeau

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  1. M.F. Toney
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  2. R.F.C. Farrow
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  3. R.F. Marks
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  4. G. Harp
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  5. T.A. Rabedeau
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Toney, M., Farrow, R., Marks, R. et al. Observation of the Ordered CoPt3 Alloy in Co-Pt Multilayers. MRS Online Proceedings Library 263, 237–242 (1992). https://doi.org/10.1557/PROC-263-237

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  • DOI: https://doi.org/10.1557/PROC-263-237

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