Abstract

This article has been retracted at the request of the Editors. Please see Elsevier Policy on Article Withdrawal ( http://www.elsevier.com/locate/withdrawalpolicy ). Reason: This article is a duplicate of a paper that has already been published in J. Appl. Phys. , 103, 064320 (2008) doi: 10.1063/1.2887989 . One of the conditions of submission of a paper for publication is that authors declare explicitly that the paper is not under consideration for publication elsewhere. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and we apologize to readers of the journal that this was not detected during the submission process.

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