Fe-Pd-X Thin Film-Polymer Composites for Sensor Applications - Development of new miniaturized sensors using composites of ferromagnetic shape memory thin films and polymers

该项目是旨在开发用于传感器应用的新型Fe-Pd-X铁磁形状记忆合金(FMSMA)薄膜的合作一揽子计划的一部分。在过去的10年里，FMSMA由于其大的磁感应应变而作为驱动器材料受到了人们的关注。传感器的应用没有被追求。然而，这些都是非常有吸引力的，并构成了本提案的主题。提案描述了FMSMA薄膜/聚合物复合材料作为机械传感器的使用，这种传感器特别适合于聚合物中存在的大应变。作为复合磁电磁场传感器的磁致伸缩元件，FMSMA同样具有广阔的应用前景。由于这些复合材料的机械阻抗必须匹配，它们的发展还将受益于FEPD FSMA的低弹性常数。Fe-Pd基材料的第三个优点是与Ni-Mn-Ga相比，它们的阻挡应力更高。机械和磁力传感器的性能都将通过它们的大磁致伸缩应变，特别是相对于磁场的大应变导数来提高，从而产生更高的灵敏度。这两个特性结合在一起，使得两个传感器的动态范围都非常宽。

This project is part of a collaboration package proposal aiming at new Fe-Pd-X ferromagnetic magnetic shape memory alloy (FMSMA) thin films for sensor applications. In the past 10 years FMSMAs received attention as actuator materials on account of their large magnetically induced strains. Sensor applications were not pursued. However, those are very attractive and form the subject of this proposal.The proposal describes the use of FMSMA thin film/polymer composites as mechanical sensors that are uniquely suited for the large strains present in polymers. FMSMAs are equally promising as the magnetostrictive component in composite magnetoelectric magnetic field sensors. Since the mechanical impedance of these composites must be matched their development will additionally benefit from the low elastic constants of FePd FSMAs. A third advantage of Fe-Pd based materials is their higher blocking stress in comparison to Ni-Mn-Ga.The performance of both mechanical and magnetic sensors will be enhanced through their large magnetostrictive strains, ¿, and especially the large strain derivative with respect to the magnetic field, ¿¿/¿¿ that gives rise to a large sensitivity. In combination these two characteristics result in a very wide dynamic range for both sensors.