LONG RANGE ORDER IN ULTRATHINPt–Co(111)ALLOYS

M. de Santis (), R. Baudoing-Savois, P. Dolle, M. C. Saint-Lager and Y. Gauthier
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M. de Santis: CNRS–Laboratoire de Cristallographie, associé à l'Université J. Fourier, BP166, F-38042 Grenoble cedex 9, France
R. Baudoing-Savois: CNRS–Laboratoire de Cristallographie, associé à l'Université J. Fourier, BP166, F-38042 Grenoble cedex 9, France
P. Dolle: CNRS–Laboratoire de Cristallographie, associé à l'Université J. Fourier, BP166, F-38042 Grenoble cedex 9, France
M. C. Saint-Lager: CNRS–Laboratoire de Cristallographie, associé à l'Université J. Fourier, BP166, F-38042 Grenoble cedex 9, France
Y. Gauthier: CNRS–Laboratoire de Cristallographie, associé à l'Université J. Fourier, BP166, F-38042 Grenoble cedex 9, France

Surface Review and Letters (SRL), 1999, vol. 06, issue 03n04, 361-368

Abstract: Long range order (LRO) in ultrathin Pt–Co films was studied by surface X-ray diffraction (XRD). Several fcc alloys of nanometric thickness were grownin situby annealing at 460°C Co layers deposited onto a Pt(111) single crystal. Superstructure reflections were observed, which agreed with the extinction rules of either theL12or theL10chemically ordered bulk phases. The relationship between their structure factor and the atomic scattering factors was found with anomalous scattering performed near both PtLIIIand Co K edges. This method is very promising for studies of surface alloying. The films were also studied in real time during annealing. They evolved in a quite different way, depending on the initial Co thickness, but LRO always occurred by heating above 400°C. At this temperature the films became Pt-rich, with a stoichiometry close toPt60Co40. We did not succeed in obtaining long range chemical order in a Co-rich alloy by annealing a Co/Pt(111) deposit, contrary to what happens in films grown by codeposition.

Date: 1999
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DOI: 10.1142/S0218625X99000366

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