Perpendicular Manganite Magnetic Tunnel Junctions Induced by Interfacial Coupling.

The half-metallic manganite oxide LaSrMnO (LSMO) has a very high spin polarization of ∼100%, making it ideal for ferromagnetic electrodes to realize tunneling magnetoresistance (TMR). Because of the in-plane magnetic anisotropy of the ferromagnetic LSMO electrode, which leads to the density limit of memory, realizing perpendicular tunneling in manganite-based magnetic tunnel junctions (MTJ) is critical for future applications. Here, we design and fabricate manganite-based MTJs composed of alternately stacked cobaltite and manganite layers that demonstrate strong perpendicular magnetic anisotropy (PMA) induced by interfacial coupling.

Super-Flexible Freestanding BiMnO Membranes with Stable Ferroelectricity and Ferromagnetism.

Multiferroic materials with flexibility are expected to make great contributions to flexible electronic applications, such as sensors, memories, and wearable devices. In this work, super-flexible freestanding BiMnO membranes with simultaneous ferroelectricity and ferromagnetism are synthesized using water-soluble Sr Al O as the sacrificial buffer layer. The super-flexibility of BiMnO membranes is demonstrated by undergoing an ≈180° folding during an in situ bending test, which is consistent with the results of first-principles calculations.

High-Conductive Protonated Layered Oxides from H O Vapor-Annealed Brownmillerites.

Protonated 3d transition-metal oxides often display low electronic conduction, which hampers their application in electric, magnetic, thermoelectric, and catalytic fields. Electronic conduction can be enhanced by co-inserting oxygen acceptors simultaneously. However, the currently used redox approaches hinder protons and oxygen ions co-insertion due to the selective switching issues.

Ferroelectricity and Ferromagnetism Achieved via Adjusting Dimensionality in BiFeO/BiMnO Superlattices.

Integrating characteristics of materials through constructing artificial superlattices (SLs) has raised extensive attention in multifunctional materials. Here, we report the synthesis of BiFeO/BiMnO SLs with considerable ferroelectric polarizations and tunable magnetic moments. The polarization of BiFeO/BiMnO SLs presents a decent value of 12 μC/cm, even as the dimensionality of BiFeO layers per period is reduced to about five-unit cells when keeping the BiMnO layers same.

Tuning ferroelectricity and ferromagnetism in BiFeO/BiMnO superlattices.

Multiferroic materials with multifunctional characteristics play a critical role in the field of microelectronics. In a perovskite oxide, ferroelectric polarization and ferromagnetism usually cannot coexist in a single-phase material at the same time. In this work, we design a superlattice structure composed of alternating BiFeO and BiMnO layers and illustrate how tuning the supercell size of epitaxial BiFeO/BiMnO superlattices facilitates ferroelectric polarization while maintaining relatively strong ferromagnetism.