Magnetoelectric sensors based on magnetostrictive and organic hybrid-composites

这种全新方法的目的是制造和表征软磁致伸缩和压电混合材料，其中，通过磁致伸缩混合材料，磁场能量几乎完全转移到压电混合材料中的电荷分离。这些新型磁电材料的两步开发计划将从压电和磁致伸缩混合材料的单独开发和对其性能的定制开始。在有机压电元件方面，将含氟共聚物与非晶态金属磁致伸缩材料相结合将是一种新的研究方向。这是基于准备工作，这已经导致ME传感器的灵敏度在pT范围内，即使在100 Hz左右的低频。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共混物取代，随后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，新型自行设计的磁致伸缩混合材料具有极高的磁致伸缩常数与嵌入的磁性纳米颗粒和纳米棒的超轻合成泡沫制成的将进行研究，并作为初步的一步，调整驻极体麦克风，以获得低噪声磁场传感器的低频。

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.