We studied the magnetic behavior of bilayers of multiferroic and nominally
antiferromagnetic o-YMnO3 (375~nm thick) and ferromagnetic
La0.7Sr0.3MnO3 and La0.67Ca0.33MnO3 (8…225nm), in particular the vertical magnetization shift ME and exchange
bias field HE for different thickness and magnetic dilution of the
ferromagnetic layer at different temperatures and cooling fields. We have found
very large ME shifts equivalent to up to 100\% of the saturation value of
the o-YMO layer alone. The overall behavior indicates that the properties of
the ferromagnetic layer contribute substantially to the ME shift and that
this does not correlate straightforwardly with the measured exchange bias field
HE.Comment: 10 figures, 8 page