Inversion of ferrimagnetic magnetization by ferroelectric switching via   a novel magnetoelectric coupling
  Although several multiferroic materials/heterostructures have been extensively studied, finding strong magnetoelectric couplings for the electric field control of the magnetization remains challenging. Here, a novel interfacial magnetoelectric coupling based on three components (ferroelectric dipole, magnetic moment, and antiferromagnetic order) is analytically formulated. As an extension of carrier-mediated magnetoelectricity, the new coupling is shown to induce an electric-magnetic hysteresis loop. Realizations employing BiFeO$_3$ bilayers grown along the [$111$] axis are proposed. Without involving magnetic phase transitions, the magnetization orientation can be switched by the carrier modulation driven by the field effect, as confirmed using first-principles calculations. 
Yakui Weng, Lingfang Lin, Elbio Dagotto, Shuai Dong
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.str-el