Paper Title:
Self-Diffusion in Magnetron-Sputtered Nanocrystalline Fe Films
  Abstract

Self-diffusion in magnetron sputtered nanocrystalline Fe films was investigated by neutron reflectometry on [natFe(10 nm)/57Fe(5 nm)]20 isotope multilayers between 310 and 510°C. The determined diffusivities corresponding to diffusion length between 0.8 – 2.1 nm are time dependent and decrease by more than two orders of magnitude during isothermal annealing. This behaviour can be attributed due to the annihilation of frozen-in point defects, formed during sputtering. For very long annealing times of more than 8 days the diffusivities above 400°C are in good accordance with the volume diffusivities on single crystals given in the literature. However, at temperatures below 400°C the diffusivities are higher than extrapolated literature data, indicating that defect annihilation is still an ongoing process. Furthermore, a comparison of diffusivities obtained for nanocrystalline Fe films prepared by magnetron sputtering and ion beam sputtering, respectively, is presented and discussed.

  Info
Periodical
Edited by
Guest Editors: Andreas Öchsner, Irina V. Belova and Graeme E. Murch
Pages
13-18
DOI
10.4028/www.scientific.net/JNanoR.11.13
Citation
S. Chakravarty, U. Tietze, D. Lott, M. Horisberger, J. Stahn, N.P. Lalla, H. Schmidt, "Self-Diffusion in Magnetron-Sputtered Nanocrystalline Fe Films ", Journal of Nano Research, Vol. 11, pp. 13-18, 2010
Online since
May 2010
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