Atomic and electronic structure of thin films of Mn on Pd{111}

Epitaxial films of Mn can be grown on Pd{111} to thicknesses of the order of 15"20 layers. Vacuum deposition on a room-temperature substrate produces a threefold-symmetric 1×1 phase with in-plane lattice constant a=2.75 (pseudomorphic to Pd{111}) and bulk interlayer spacing dbulk=2.16. This structure probably corresponds to strained magnetic -Mn. Vacuum deposition on a 150°C substrate produces a sixfold-symmetric 3 × 3 -30°structure, which is probably a bulk phase with in-plane lattice constant a=4.76. The atomic structure of this phase is unknown, but may be related to ±-Mn. © 1992 The American Physical Society.