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Abstract:
Small bimetallic PdFe particles supported on well ordered alumina film grown on NiAl(110) were studied focusing on the geometric, electronic, adsorption, as well as magnetic properties. The morphology, growth mode and surface composition were investigated by combining scanning tunneling microscopy (STM), temperature programmed desorption (TPD) and infrared spectroscopy (IRAS) using CO as a probe molecule. Information on the electronic properties of the bimetallic systems was obtained by means of X-ray photoelectron spectroscopy (XPS). These measurements were amended by in-situ ferromagnetic resonance spectroscopy to address the magnetic properties of the bimetallic particles. When both metals are deposited sequentially at 300K, Pd easily forms a shell on existing Fe particles, however, FMR and XPS suggest that intermixing of Pd and Fe occurs to some extent. In the reverse order, much more Fe is required to coat Pd particles, because of the strong tendency of Pd to diffuse on to the surface of the particles.
