Self-Assembled Lateral Multilayers from Thin Film Alloys of Immiscible Metals
1998; American Physical Society; Volume: 81; Issue: 9 Linguagem: Inglês
10.1103/physrevlett.81.1897
ISSN1092-0145
AutoresE. D. Tober, R. F. C. Farrow, R. F. Marks, Gregor Witte, K. Kalki, D. D. Chambliss,
Tópico(s)Advanced Chemical Physics Studies
ResumoThin films consisting of alloys of immiscible metals display a unique form of compositional ordering not observed in the bulk. Utilizing scanning tunneling microscopy and low energy electron diffraction, we have examined thin films of ${\mathrm{Co}}_{\ensuremath{\eta}}{\mathrm{Ag}}_{1\ensuremath{-}\ensuremath{\eta}}$ and ${\mathrm{Fe}}_{\ensuremath{\eta}}{\mathrm{Ag}}_{1\ensuremath{-}\ensuremath{\eta}}$ grown on Mo(110) surfaces. Both of these systems are observed to form a compositionally ordered alloy of alternating, contiguous stripes of Co (or Fe) and Ag with the long axis of the stripe coinciding with the Mo[001] direction in the plane of the substrate. The average stripe periodicities are on the order of 2.0 to 2.5 nm along the $\mathrm{Mo}[\overline{1}10]$ (perpendicular to the stripes) direction depending on film stoichiometry.
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