Novel Magnetic Shape Memory Alloy Thin Films for Sensor and Actuator Applications

该奖项的研究目标是研究新型磁性形状记忆合金薄膜，并将这些薄膜用作传感器和致动器的支柱。特别是，一类新的镍基Heusler合金薄膜，这是能够提供高的频率响应，以及由于塞曼能量诱导相变高致动应变，将被用作一个模型系统和测试的真实的应用。这一目标将通过使用以下科学方法来实现：（1）研究相分离对相变的影响;（2）探索和调整薄膜中的残余应力以调节相变;（3）理解场致应变和可逆相变的尺寸效应;（4）演示通过双层薄膜进行磁场传感的概念;（5）研究薄膜中的应力分布;（6）研究薄膜中的应力分布;（7）研究薄膜中的应力分布;（8）研究薄膜中的应力分布;（9）研究薄膜中的应力分布;（10）研究薄膜中的应力分布;（11）研究薄膜中的应力分布;（12）研究薄膜中的应力分布;（13）研究薄膜中的应力分布;（14）研究薄膜中的应力分布;（15）研究薄膜中的应力分布;（16）研究薄膜中的应力分布;（17）研究薄膜中的应力分布;（18）研究薄膜中的应力分布;（19）研究薄膜中的应力分布;（19）研究薄膜中的应力分布;（19）研究薄膜中的应力分布;（19以及（5）通过膜制造致动器。如果成功的话，这项研究的好处将包括阐明磁场诱导形状变化的基本磁微结构机制，在多个长度尺度上，和一类新的磁性形状记忆合金薄膜的传感器和执行器的应用。该项目将显著改善能够快速可逆变形、阻尼和被动发电的主动传感系统的设计。其次，它将促进以磁性薄膜为重点的当地学习环境。活动将包括创建教学模块的积极材料，参与代表性不足的群体通过？通往博士学位的道路？研究金计划在得克萨斯州A M大学，实验室示范模型在纳米材料的等级7 - 12，并参与本科研究人员。&第三，通过现有的用户项目与洛斯阿拉莫斯国家实验室和桑迪亚国家实验室的综合纳米技术中心的科学家合作，将为研究生提供在这些先进的研究中心和实验室工作的机会。

The research objective of this award is to investigate novel magnetic shape memory alloy thin films and use these films as the backbone of sensors and actuators. In particular, a class of novel Ni-based Heusler alloy films, which is capable of delivering high frequency response as well as high actuation strain due to Zeeman energy induced phase transformations, will be used as a model system and tested for real applications. This objective will be achieved by using the following scientific approaches: (1) investigate the influence of phase segregation on phase transformations; (2) explore and tailor residual stress in films to tune phase transformations; (3) understand the size effect on field induced strain and reversible phase transformations; (4) demonstrate the concept of magnetic field sensing via bilayer films; and (5) fabricate actuators via membranes. If successful, the benefits of this research will include elucidation of fundamental magneto-microstructural mechanisms of field-induced shape change across multiple length scales, and a new class of magnetic shape memory alloy films for sensor and actuator applications. The project will significantly improve the design of active sensing systems capable of fast and reversible deformation, damping and passive power generation. Second, it will promote a local learning environment focusing on magnetic thin films. Activities will include creation of teaching modules of active materials, involvement of underrepresented groups through the ?Pathway to Ph.D.? fellowship program at Texas A&M University, laboratory demonstration models in nanomaterials for grades 7-12, and involvement of undergraduate researchers. Third, collaborations with scientists at the Center for Integrated Nanotechnologies, at Los Alamos National Laboratory and Sandia National Laboratory through the existing user project will provide graduate student opportunities to work at these advanced research centers and laboratories.