Magnetic Micro- and Nanostructures for Sensor Applications

该项目旨在通过滚动磁性纳米膜开发微米和纳米级管状磁场传感器，该传感器检测流经管道的介质中的小磁场，并可与同一管道部分上的其他传感器元件集成。基础理论和实验研究计划阐明的几何诱导巨磁电阻效应（GMR），这是传感器的基本测量原理的微观耦合现象。为了进一步优化传感器功能，将确定由卷起引起的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地修改，使得沿着管沿着限定不同空间布置的磁段。系统地改变管的尺寸将允许分析滚动对GMR效应的几何效应。软X射线层析成像技术的拟议发展提供了一个世界范围内独特的访问三维检测的复杂矢量场遇到的磁性和磁性检测。其次，它也是一个理想的起点，规模适应性建模，嵌入复杂形状的探测器几何形状的磁功能到经典的设备模拟。最后，将利用研究小组在子项目TP6和TP8的第一阶段获得的联合专门知识来制备多功能卷起元件，该元件结合了光学和磁性检测能力，并首次尝试实现“试管实验室”概念。

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.