Electric field control of magnetism through modulating phase separation in (011)-Nd0.5Sr0.5MnO3/PMN-PT heterostructures

Abstract

Large and non-volatile electric field control of magnetization is promising to develop memory devices with reduced energy consumption. Herein, we report the electric field control of magnetization with a non-volatile memory effect in an intermediate band Nd_0.5Sr_0.5MnO₃ film grown on a (011)-cut 0.7Pb(Mg_1/3Nb_2/3)O₃-0.3PbTiO₃ (PMN-PT) single crystal. Applying an electric field across the ferroelectric PMN-PT increases the magnetization of the Nd_0.5Sr_0.5MnO₃ film along both in-plane [100] and [01] directions. Moreover, the magnetization does not recover to its original state after withdrawal of the electric field at temperatures below 70 K, demonstrating a non-volatile memory effect. Detailed investigation showed that (011)-PMN-PT exhibits an anisotropic in-plane strain due to an electric field-induced rhombohedral to orthorhombic phase transition. This electric field-induced anisotropic strain can dynamically transfer to Nd_0.5Sr_0.5MnO₃ film and modulate the magnetization of the Nd_0.5Sr_0.5MnO₃ film through adjusting its phase balance between ferromagnetic (FM) and charge-orbital ordered antiferromagnetic (COO AFM) phases. The non-volatile memory effect can be ascribed to the competition of thermal energy and energy barriers between the FM and COO AFM phases at low temperatures. This work broadens the knowledge of electric field control of magnetism in the intermediate band-manganite ferromagnetic/ferroelectric multiferroic heterostructures, and may also pave a way for the control of antiferromagnetism and to design antiferromagnet-based memories.