Temperature dependent exchange bias effect in polycrystalline BiFeO3/FM (FM = NiFe, Co) bilayersXiaobo Xue, Xueyong Yuan, Wenbin Rui, Qingyu Xu, Biao You, Wei Zhang, Shiming Zhou and Jun DuEur. Phys. J. B, 86 4 (2013) 121DOI: https://doi.org/10.1140/epjb/e2013-31003-y