Journal of Applied Physics, 1 August 2008
J. Appl. Phys. 104, 033506 (2008) (7 pages)
©2008 American Institute of Physics. All rights reserved. 
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*Author to whom correspondence should be addressed. Electronic mail: ramki@utk.edu. Present address: Department of Materials Science and Engineering & Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996.
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