Growth modes of iron on copper single crystal surfaces.

Title: Growth modes of iron on copper single crystal surfaces.
Identifier: AAI9432330
identifier: 9432330
Creator: Cao, Yuqun.
Contributor: Adviser: Pedro A. Montano
Date: 1994
Language: English
Publisher: City University of New York.
Subject: Physics, Condensed Matter
Abstract: Using the High Resolution Low Energy Electron Diffraction (HRLEED) technique as our primary method, we investigated the initial growth stage of Fe thin films on the Cu(100), (110) and (111) substrates at different deposition temperatures under the Ultra High Vacuum (UHV) environment. We also investigated the thermal stability of the thin films that were grown in various conditions. Our HRLEED measurement shows that the growth of Fe on the Cu surfaces is a complex process. It is far from the simple heteroepitaxial system that might be expected on the basis of lattice match and mutual immiscibility. The better Fe epitaxial films are grown in the higher temperature regime. The Fe films grown at low and room temperature are not thermal stable and will undergo an irreversible structure re-arrangement when heated to high temperature. The annealing process helps to reduce the defects of the overlayer, thus improve the quality of the thin film. A model of surface atoms re-arrangement is introduced to explain the LEED spot intensity up-shift and the drop of the Fe Auger signal by the annealing process.
Type: dissertation
Source: PQT Legacy CUNY.xlsx
degree: Ph.D.