Structure and morphology of ultrathinCo/Ru(0001) films

Structure and morphology of ultrathinCo/Ru(0001) films,10.1088/1367-2630/9/3/080,New Journal of Physics,Farid El Gabaly,Juan M. Puerta,Christof Klein,

Structure and morphology of ultrathinCo/Ru(0001) films   (Citations: 2)
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We follow the layer by layer growth of cobalt on ruthenium by means of low-energy electron microscopy (LEEM) and diffraction (LEED). Around 500 K each layer forms through the nucleation and growth of triangular islands. Fully dynamical calculations of the diffraction intensities establish that the first monolayer (ML) grows pseudomorphically, i.e. following the Ru hexagonal close packed (hcp) stacking sequence. In films thicker than a ML, the in-plane lattice spacing is relaxed and the resulting superstructures produce satellite spots in the diffraction patterns. Our LEED analysis indicates that in two ML films the first Co layer is stacked in two ways on Ru, but there are no stacking faults between the Co layers themselves. In three ML thick regions, additional stacking faults are located at the topmost Co layer. These stacking faults are associated with distinct island shapes and unique selected-area diffraction spectra. Our study supports the simple picture that island orientation reflects the stacking type.
Journal: New Journal of Physics - NEW J PHYS , vol. 9, no. 3, pp. 80-80, 2007
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    • ...To achieve this type of growth, it is important to avoid substrate regions with high step density, which tend to enhance three-dimensional (3D) growth in Co/Ru(0001) in particular [34], and in strained systems in general [35]...
    • ...Preventing alloying is more challenging in the limit of monolayer-thick films of Co on Ru. These films are severely strained and lattice matched to the substrate [34], and alloying has been observed in the first layer of AgCo on Ru(0001), where the chemical energy cost of putting Ag and Co atoms in contact is overcome by the elastic energy gain from the matching of the AgCo combination to the Ru substrate lattice spacing [39, 40]...

    Farid El Gabalyet al. Noble metal capping effects on the spin-reorientation transitions of C...

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