Formation and Kinetics of Axially Intruded Iron Silicide and Nickel Silicide Nanowires

Open Access
Author:
Schuh, Carolyn Jeanne
Graduate Program:
Materials Science and Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 20, 2012
Committee Members:
  • Suzanne E Mohney, Thesis Advisor
Keywords:
  • iron
  • nickel
  • silicide
  • nanowire
  • kinetics
  • phase formation
  • intruded silicide
  • spin injection
  • spintronics
Abstract:
The formation of axially intruded iron silicide nanowires is investigated for its potential applications in spintronics research. The ferromagnetic Fe3Si has a 125% volume increase per silicon atom over the original silicon nanowire, which leads to significant kinking of the nanowire. The kinetics of silicide formation were also investigated for intruded nickel silicide nanowires as dependent on nanowire diameter. Growth rate was found depend on nanowire radius R as 1/Rn where n is at least 0.5 and more likely 2. Individual differences among the nanowires indicate that in future studies it would be better to cumulatively anneal a single wire to remove the influence of wire to wire variability.