Novel Multiferroic-Like Nanocomposite with High Pressure-Modulated Magnetic and Electric Properties

摘要

In this work, a novel multiferroic-like nanocomposite is designed andobtained using the high-pressure torsion (HPT) method. The crystal structure,phase composition, morphology, ferromagnetic (FM), and ferroelectric(FE) properties of the initial powders and ferroelectric/ferromagneticnanocomposites are studied comprehensively. The initial powders and theircomposite show the perovskite and spinel crystalline phases for the FE andFM fractions, respectively. After HPT, the particle sizes of the initial powdersare decreased significantly. It is shown that the novel nanocomposite consistsof exchange-interacting FE and FM phases and demonstrates improvedmagnetic and electrical properties in low fields at room temperature. A giantincrease in residual polarization with an increase in external high-pressure isfound in new composite. The obtained results make it possible to considerthe novel nanocomposite as a new functional material for its use both in electronicdevices for monitoring ultra-high-pressure and in integrated circuitsof high-speed computing nanosystems with low switching energy. The HPTmethod is a promising method for obtaining new heterophase nanosystems.