Charge-mediated electric control of the perpendicular magnetic anisotropy in Fe–Ga/PMN-PT composite multiferroic

Abstract

We present an experimental study of the magnetoelectric coupling in the Fe-Ga/Pb[(Mg1=3Nb2=3)O3]0:68-[PbTiO3]0:31 thin-film multiferroic composite using x-ray magnetic circular dichroism and ferromagnetic resonance (FMR). Our measurements show evidence for a chargemediated coupling mechanism, suggested by the asymmetric magnetic remanence (Mrem) behavior under opposite electric fields (+E) and the asymmetric resonance field (Hr) in the FMR measurements. Also, the FMR measurements reveal a perpendicular magnetic anisotropy that can be related to an interface charge effect and it is tunable by the E field. Ab initio calculations support the existence of a charge-mediated coupling at the Fe–Ga/PMN-PT interface.