Multiferroics are defined as materials exhibiting simultaneously more than one primary ferroic order parameter among ferromagnetism, ferroelectricity, ferroelasticity and ferrotoroidicity.

Beside the fundamental research at the frontline of the material science, multiferroics are gaining increasingly interest for their potential applications in the field of sensors, electronic devices or whenever the electrical/magnetic properties can be mutually controlled.

However, these compounds are rare in nature and the coupling (between ferromagnetism and ferroelectricity in the most common case) is typically weak for practical use.

The synthesis under high pressure/high temperature (HP/HT) is a powerful tool to obtain new materials; moreover, the application of external pressure induces structural changes, which are often responsible of peculiar properties.

In this presentation, a selection of bulk multiferroic materials with perovskite-based compounds synthesized by HP/HT techniques at IMEM-CNR will be reviewed. The perovskite structure is a model system, for its ability to accommodate pressure-induced distortions in different ways, giving rise to metastable phases.

Increasing the structural complexity, from conventional-perovskite compound (BiMnO3) to double- (Bi2FeMnO6, PbFeMoO6) and quadruple-perovskite (BiMn7O12), the fundamental role of high pressure on the structural and the magneto-electric properties originated by the  multiferroic coupling will be discussed.

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