Hysteresis loop along (a) [100] direction of CoFeB layer, (b) [100] direction, (c) direction, and (d) [010] direction of CoFeB (5 nm)/BFO bilayer. (e) and (f) room temperature magnetic properties of CoFe/BFO heterostructure showing improvement of coercivity and exchange bias, respectively. (a)–(d) were reproduced from Béa et al. [43], and (e) and (f) were reproduced with permission from Martin et al. [48].
