Magnetoelectric sensors based on magnetostrictive and organic hybrid-composites

这一全新的方法的目的是制备和表征软磁致伸缩和压电杂化材料，其中，通过磁致伸缩杂化材料，磁场能量几乎完全传递到压电杂化材料中用于电荷分离。这些新型磁电材料的预期开发将分两步进行，首先是分别开发压电和磁致伸缩混合材料，并调整它们的性能。对于有机压电元件，将含氟共聚物与非晶态金属磁致伸缩材料相结合，将寻求不同的新方法。这是基于准备工作，这已经导致ME传感器在PT范围内具有灵敏度，即使在100赫兹左右的低频也是如此。在第二步中，共聚物将被具有非常低的介电常数和高介电强度的特殊聚合物混合物取代，随后将被具有特别大的压电系数和几乎理想的小介电常数的泡沫聚合物驻极体取代。对于磁致伸缩混合元件，将研究由嵌入磁性纳米颗粒和纳米棒的超轻合成泡沫组成的具有极高磁致伸缩常数的新型磁致伸缩混合材料，作为初步步骤，将其调整到驻极体麦克风中，以获得低噪声的低频磁场传感器。

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.