Submitted on: 25 February 2013.
Revised on: 28 May 2013.
Accepted on: 21 July 2013.
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Submitted on: 18 March 2005.
Revised on: 23 May 2005.
Accepted on: 18 June 2005.
___________________JOURNAL OF APPLIED PHYSICS---AIP PUBLISHING
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Submitted on: 18 January 2014.
Revised on: 21 February 2014.
Accepted on: 21 April 2014.
___________________JOURNAL OF APPLIED PHYSICS---AIP PUBLISHING
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Submitted on: 19 August 2008.
Revised on: 16 December 2008.
Accepted on: 12 February 2009.
___________________JOURNAL OF APPLIED PHYSICS---AIP PUBLISHING