Giant EB in multiferroics

Giant exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9
Tuhin Maity and Saibal Roy, Sudipta Goswami and Dipten Bhattacharya
ArXiv 1202.5898 (2012)

(a) The spontaneous exchange bias observed at different temperatures under zero-field cooling (b) the conventional EB observed under magnetic annealing at 5 K; it turns out to be negative in this case too