Magnetic Micro- and Nanostructures for Sensor Applications

该项目旨在通过轧制磁性纳米膜来开发微纳米级管状磁场传感器，该传感器可以检测流过管中的介质中的小磁场，并且可以与同一管截面上的其他传感器元件集成。为了阐明几何感应巨磁阻效应（GMR）的微观耦合现象，计划进行基础理论和实验研究，这是传感器的基本测量原理。为了进一步优化传感器功能，将确定由卷起引起的对平面初始膜的畴结构和谐振模式的偏差。为此目的，铁磁层的磁化将通过离子照射局部改变，从而沿着管定义不同空间排列的磁段。一个系统的管的尺寸变化将允许分析滚动对GMR效应的几何效应。软x射线断层扫描技术的发展为复杂矢量场的三维检测提供了一种世界范围内独特的途径，就像在磁学和磁检测中遇到的那样。其次，它也是一个理想的尺度适应建模的起点，它将复杂形状探测器几何形状的磁功能嵌入到经典器件仿真中。最后，在子项目TP6和TP8的研究小组第一阶段获得的联合专业知识将被利用来准备一个多功能的卷起元件，它结合了光学和磁检测能力，并提出了“试管实验室”概念的第一次尝试。

The project aims at developing micro- and nano-scale tubular magnetic field sensors by rolling magnetic nano-membranes, which detects small magnetic fields in a medium flowing through the tube and can be integrated with other sensor elements on the same tube section. Fundamental theoretical and experimental studies are planned to elucidate the microscopic coupling phenomena in the geometrically induced giant magnetoresistance effect ( GMR), which is the basic measuring principle of the sensor. For further optimizing the sensor function, deviations from the domain structure and the resonant modes of the planar initial film caused by the rolling up will be determined. For that purpose the magnetization of the ferromagnetic layer will locally be modified by ion irradiation such that magnetic segments of different spatial arrangement are defined along the tube. A systematic variation of the dimensions of the tube will allow to analyzing the geometric effects of rolling on the GMR effect. The proposed development of the soft X-ray tomography technique offers a worldwide unique access to three-dimensional detection of complex vector fields as the ones encountered in magnetism and magnetic detection. Secondly, it is also an ideal starting point for a scale-adapted modeling, which embeds the magnetic functionality of complex-shaped detector geometries into classical device simulation. Finally, the joint expertise gained during the first phase of the research group within of the subprojects TP6 and TP8 will be exploited to prepare a multifunctional rolled-up element, which combines optical and magnetic detection capabilities and poses the very first attempt towards "lab-in-a-tube" concept.