Uncompensated magnetization and exchange-bias field in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/YMnO${}_3$ bilayers: The influence of the ferromagnetic layer

Abstract

We studied the magnetic behavior of bilayers of multiferroic and nominally antiferromagnetic o-YMnO${}_3$ (375~nm thick) and ferromagnetic La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ and La${}_{0.67}$Ca${}_{0.33}$MnO${}_3$ ($8\dots 225$nm), in particular the vertical magnetization shift $M_E$ and exchange bias field $H_E$ for different thickness and magnetic dilution of the ferromagnetic layer at different temperatures and cooling fields. We have found very large $M_E$ 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 $M_E$ shift and that this does not correlate straightforwardly with the measured exchange bias field $H_E$.

10 figures, 8 pages

References in corpus (1)

• Electric field control of exchange bias in multiferroic epitaxial heterostructures