Magnetoelectric sensors based on magnetostrictive and organic hybrid-composites

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The aim of this completely new approach is to fabricate and characterize soft magnetostrictive and piezoelectric hybrid materials in which, via a magnetostrictive hybrid material, the magnetic field energy is transferred almost completely for charge separation in a piezoelectric hybrid material. The intended development of these novel magnetoelectric materials in two steps will start with the separate development of the piezoelectric and magnetostrictive hybrid materials and the tailoring of their properties. For the organic piezoelectric component, different new approaches will be pursued by combining fluorinated copolymers with amorphous metallic magnetostrictive materials. This is based on preparatory work, which already leads to ME sensors with sensitivities in the pT range even at low frequencies around 100 Hz. In a second step the copolymers will be replaced by special polymer blends with a very low dielectric constant and high dielectric strength, and subsequently by foamed polymer electrets with particularly large piezoelectric coefficients and almost ideally small dielectric constant. For the magnetostrictive hybrid component, novel self designed magnetostrictive hybrid materials with extremely high magnetostrictive constants made up of ultralight synthetic foams with embedded magnetic nanoparticles and nanorods will be investigated and, as a preliminary step, adjusted to electret microphones in order to obtain low noise magnetic field sensors for low frequencies.