Magnetoelectric phase control at domain-wall-like epitaxial oxide multilayers

Abstract

Ferroelectric domain walls are nanoscale objects that can be created, positioned, and erased on demand. They often embody functional properties that are distinct from the surrounding bulk material. Enhanced conductivity, for instance, is observed at charged ferroelectric domain walls. Regrettably, domain walls of this type are scarce because of the energetically unfavorable electrostatics. This hinders the current technological development of domain-wall nanoelectronics. Here we overcome this constraint by creating robust domain-wall-like objects in epitaxial oxide heterostructures. We design charged head-to-head (HH) and tail-to-tail (TT) junctions with two ferroelectric layers (BaTiO${}_3$ and BiFeO${}_3$) that have opposing out-of-plane polarization. To test domain-wall-like functionalities, we insert an ultrathin ferromagnetic La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ layer into the junctions. The interfacial electron or hole accumulation at the interfaces, set by the HH and TT polarization configurations, respectively, controls the LSMO conductivity and magnetization. We thus propose that trilayers reminiscent of artificial domain walls provide magnetoelectric functionality and may constitute an important building block in the design of oxide-based electronic devices.

28 pages, 4 figures

References in corpus (12)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Anisotropic conductance at improper ferroelectric domain walls
• Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films
• Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films
• Carrier-mediated magnetoelectricity in complex oxide heterostructures
• Origin of the magnetoelectric coupling effect in Pb(Zr0.2Ti0.8)O3/La0.8Sr0.2MnO3 multiferroic heterostructures
• Prediction of electrically-induced magnetic reconstruction at the manganite/ferroelectric interface
• Tuning the Competition between Ferromagnetism and Antiferromagnetism in a Half-doped Manganite through Magnetoelectric Coupling
• Preventing the reconstruction of the polar discontinuity at oxide heterointerfaces
• Determining the Curie temperature of La0.67Sr0.33MnO3 thin films
• Enhancing interfacial magnetization with a ferroelectric
• Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures

Cited by in corpus (2)

• Control of polarization and polar chiral textures in BiFeO${}_3$ by epitaxial strain and interfacial chemistry
• Revival of Layered Ferroelectrics in Thin Films