Magnetoelectro-elastic control of magnetism in an artificial multiferroic

Abstract

We study the coexistence of strain- and charge-mediated magnetoelectric coupling in a cobalt (0-7 nm) wedge on ferroelectric [Pb(Mg${}_{1/3}$/Nb${}_{2/3}$)O${}_3$]${}_{0.68}$-[PbTiO${}_3$]${}_{0.32}$ (011) using surface-sensitive x-ray magnetic circular dichroism spectroscopy at the Co L${}_{3,2}$ edges. Three distinct electric field driven remanent magnetization states can be set in the Co film at room temperature. Ab-initio density functional theory calculations unravel the relative contributions of both strain and charge to the observed magnetic anisotropy changes illustrating magnetoelectro-elastic coupling at artificial multiferroic interfaces.