On beating the superparamagnetic limit with exchange bias R. F. L. Evans, R. Yanes, O. Mryasov, R. W. Chantrell and O. Chubykalo-Fesenko EPL, 88 5 (2009) 57004 Published online: 11 December 2009 DOI: 10.1209/0295-5075/88/57004