Flexible metamaterials, comprising multiferroic films

The metamaterial (MM) devices on flexible substrates provide a new dimension in manipulating electromagnetic (EM) waves. This work reports MMs realized on flexible and elastomeric substrates, along with the relevant techniques and approaches. Future directions are mentioned with the promise to translate MMs into practical devices. We also present a multiferroic nano-composite film where BiFeO
₃
(BFO) nanoparticles (NPs) were evenly dispersed into highly-insulating polyvinyl alcohol (PVA) polymer. The multiferroic (MF) properties of the film were revealed, such as the saturated ferroelectric curves due to the cut-off of current leakage. Moreover, the prepared films show high flexibility and their multiferroicities are preserved well even in a high curved condition, reflecting the possibility for fabricating wearable devices based on MF materials.