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During the field treatment of the samples prior to measurement, the magnetic field was switched in polarity with each step down in magnitude while the sample was being rotated within the magnetic field. A more detailed description of the field treatment can be found in ref. 1.
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Wang, R., Nisoli, C., Freitas, R. et al. Artificial ‘spin ice’ in a geometrically frustrated lattice of nanoscale ferromagnetic islands. Nature 446, 102 (2007) doi:10.1038/nature05607
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