@article{article4223c3b2,
title   = {Artificial ‘spin ice’ in a geometrically frustrated lattice of nanoscale ferromagnetic islands},
author = {Wang, R F and Nisoli, C and Freitas, Rafael Sá de and Li, J and McConville, W and Lund, and Samarth, N and Leighton, C and Crescpi, V H and Schiffer, P},
year = {2006},
journal   = {Nature}
}