Initial Stages of FeO Growth on Ru(0001)

Abstract

We study how FeO wüstite films on Ru(0001) grow by oxygen-assisted molecular beam epitaxy at elevated temperatures (800-900 K). The nucleation and growth of FeO islands are observed in real time by low-energy electron microscopy (LEEM). When the growth is performed in an oxygen pressure of 10-6 Torr, the islands are of bilayer thickness (Fe-O-Fe-O). In contrast, under a pressure of 10-8 Torr, the islands are a single FeO layer thick. We propose that the film thickness is controlled by the concentration of oxygen adsorbed on the Ru. More specifically, when monolayer growth increases the adsorbed oxygen concentration above a limiting value, its growth is suppressed. Increasing the temperature at a fixed oxygen pressure decreases the density of FeO islands. However, the nucleation density is not a monotonic function of oxygen pressure.

17 pages, 8 figures

References in corpus (4)

• Magnetism in nanometer-thick magnetite
• Structure and magnetism in ultrathin iron oxides characterized by low energy electron microscopy
• Growth and electronic and magnetic structure of iron oxide films on Pt(111)
• Electron reflectivity measurements of Ag adatom concentrations on W(110)

Cited by in corpus (4)

• Ostwald ripening in an oxide-on-metal system
• Structure and magnetism of the $(2\times 2)$-FeO(111) surface
• Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals
• A Platform for Addressing Individual Magnetite Islands Grown Epitaxially on Ru(0001) and Manipulating Their Magnetic Domains