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Unhappy vertices in artificial spin ice new degeneracies from vertex frustration

Video abstract for the article 'Unhappy vertices in artificial spin ice: new degeneracies from vertex frustration' by Muir J Morrison, Tammie R Nelson and Cristiano Nisoli (Muir J Morrison et al 2013 New J. Phys. 15 045009). Read the full article in New Journal of http://iopscience.iop.org/1367-2630/15/4/045009/article. Part of Focus on Artificial Frustrated Systems