Abstract
We have investigated the kinetic effects on the morphological evolution of an -ion sputtered Pd(001) by in situ, real-time x-ray reflectivity and grazing-incidence small angle x-ray scattering measurements at various substrate temperatures. We find that surface roughness and its associated growth exponent increase with up to a certain temperature . Beyond , however, they decrease with increasing . For , surface roughening and coarsening kinetics are mostly driven by the deposition and diffusion of sputter-induced adatoms as reported in molecular beam epitaxial growth. When is near , however, vacancies rather than adatoms become the dominant surface species. Above , the surface smoothing via adatom detachment and vacancy diffusion across step edges becomes effective.
2 More- Received 17 August 2005
DOI:https://doi.org/10.1103/PhysRevB.73.125425
©2006 American Physical Society