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

ZANDALAZINI C.I.; ESQUINAZI, P; BRIDOUX, G; BARZOLA-QUIQUIA, J.; HOLDAG, H.; ARENHOLZ, E.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Año: 2011 vol. 323 p. 2892 - 2898

0304-8853

We studied the magnetic behavior of bilayers of multiferroic and nominally antiferromag- netic o-YMnO3 (375 nm thick) and ferromagnetic La0.7Sr0.3MnO3 and La0.67Ca0.33MnO3 (8 . . . 225 nm), 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, including XMCD magnetization shift measured at the Mn-L edge of the LSMO layer only, indicate 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.