Spin correlations and exchange in square-lattice frustrated ferromagnets M. Skoulatos, J. P. Goff, C. Geibel, E. E. Kaul, R. Nath, N. Shannon, B. Schmidt, A. P. Murani, P. P. Deen, M. Enderle and A. R. Wildes EPL, 88 5 (2009) 57005 Published online: 11 December 2009 DOI: 10.1209/0295-5075/88/57005