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Thin highly epitaxial BiFeO3 films were prepared on SrTiO3 (100) substrates by reactive magnetron cosputtering. Detailed magneto-optic Kerr effect (MOKE) measurements on BiFeO3/Co-Fe bilayers were performed to investigate the exchange bias as a function of film thicknesses and Co-Fe stoichiometries. We found a maximum exchange bias of Heb = 92 Oe and a coercive field of Hc = 89 Oe for a 12.5 nm-thick BiFeO3 film with a 2 nm-thick Co layer. The unidirectional anisotropy is clearly visible in in-plane rotational MOKE measurements. Anisotropic magnetoresistance measurements reveal a strongly increasing coercivity with decreasing temperature, but no significant change in the exchange bias field.

Room Temperature Exchange Bias in BiFeO3/Co–Fe Bilayers

Room Temperature Exchange Bias in BiFeO₃/Co–Fe Bilayers