ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
In situ observations of reflection high-energy electron diffraction (RHEED) are used to study the structure and growth of epitaxial Co/Mn superlattices on hcp (0001) Ru buffer layers. Mn deposited on fcc (111) or hcp (0001) Co presents a singular growth behavior which can be interpreted as an incoherent growth with compressive stresses perpendicular to the surface. Moreover, the Mn structure is found to switch from a sixfold in-plane symmetric 1×1 structure, which probably corresponds to strained fcc γ-Mn, to a sixfold in-plane symmetric (square root of)3×(square root of)3−30° structure with in-plane lattice parameter a=4.69 A(ring). This structural change occurs at a critical thickness of 5–6 monolayers, after the partial relaxation of the Mn in-plane lattice parameter. An analysis of the three-dimensional contribution to the RHEED patterns shows that the (square root of)3×(square root of)3−30° structure is probably identical to the Cu2Mg Laves phase which in turn closely resembles the α-Mn phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.357516
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