FRG: New Magnetoelastic Materials with High Stress Sensitivity and Low Hysteresis

从材料研究部到爱荷华州州立大学的这个重点研究小组奖是表征，理解和改进Jiles教授和合作者发现的一类新的磁致伸缩复合材料，他们得到了以前NSF赞助的研究的支持（DMR-9902415）。 研究的主要推力将是研究理论和实验方法，以提高响应线性和减少滞后，通过利用原子替代方案在适当的晶格位置的材料，以减少交换耦合导致非线性滞后效应。 PI将探索基于金属粘合剂中的钴铁氧体的磁弹性复合材料，用作轴向和扭转非接触式传感器中的应力敏感材料。 将制备钴铁氧体与硅、锰和钴的合金（用这些取代铁氧体中的铁），以将居里温度降低至室温，从而使不期望的滞后最小化。这些新型材料有望显著改善磁致弹性特性，优于竞争材料。该奖项可以完成大量的研究经验，结合促进教学，培训和学习，无论是在研究生和本科生水平。 与领先的本科院校摩拉维亚学院的拟议合作将为两个机构提供更广泛的经验，并可能在未来几年建立协同关系。该奖项的成功结果可能是在节能和安全应用中将这些应力敏感材料用于轴向和扭转非接触式传感器的许多行业的重大技术转让

This Focused Research Group award from the Division of Materials Research to Iowa State University is to characterize, understand, and improve upon a new class of magnetostrictive composite material discovered by Professor Jiles and collaborators, who were supported by a previous NSF-sponsored research (DMR-9902415). Primary thrust of the research would be to investigate both theoretical and experimental ways to enhance response linearity and to reduce hysteresis by exploiting an atomic substitution scheme at appropriate lattice sites in the material to reduce exchange-coupling leading to nonlinear hysteretic effects. The PIs will explore magnetoelastic composites based on cobalt ferrite in a metallic binder for use as stress sensitive materials in axial and torsional non-contact sensors. Alloys of cobalt ferrite with Silicon, Manganese and Cobalt (substituting these for the Iron in the ferrite) will be prepared to reduce the Curie temperature to room temperature thereby minimizing undesirable hysteresis. These new class of materials are expected to significantly improve magnetoelastic characteristics over competitive materials. %%%This award could accomplish substantial research experience combined with promotion of teaching, training, and learning both at the graduate and undergraduate levels. The proposed collaboration with Moravian College, a leading undergraduate institution would be a broadening experience for both institutions and will likely create a synergistic relationship for years to come. A successful outcome of this award could be a significant technology transfer to a number of industries in the use of these stress sensitive materials in axial and torsional non-contact sensors in energy conservation and safety applications