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==References== | ==References== | ||
1. [https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.87.167902 Harry Buhrman et al (2001)] | |||
<div style='text-align: right;'>''*contributed by Shraddha Singh''</div> | <div style='text-align: right;'>''*contributed by Shraddha Singh''</div> |