Robust Room Temperature Electric Field Control of Structural, Magnetic and Transport Properties of Ultra-Thin Shape Memory Heusler Alloys Films

超薄形状记忆赫斯勒合金薄膜的结构、磁性和输运性能的鲁棒室温电场控制

• 批准号: 1310542
• 负责人: Andrei Sokolov
• 金额: $ 36.46万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310542&HistoricalAwards=false
• 关键词: Robust; Room; Temperature; Electric; Field

TECHNICAL SUMMARY:The goal of this project is to demonstrate a new family of nanoferroic multifunctional devices, based on shape-memory Heusler alloy films in ferroelectric heterojunctions, where resistance, magnetic and structural properties of the Heusler alloys will be switchable by applied electric field. Heusler alloys are a group of intermetallic compounds that have unique and interesting electro-magnetic behaviors, including the magnetic shape-memory effect. Selected shape-memory Heusler alloys are expected to be better than manganite-based compounds because their transformations can be controlled to occur near room temperature. This research attempts to distinguish the roles of electronic and strain-mediated coupling between layers in heterojunctions in order to determine the origin of each effect. It also attempts to identify the mechanism of the martensitic phase transformation in the Heusler alloy films. It is ultimately envisioned that this research may lead to a new class of nanoferroic multifunctional devices enabling new sensor and electronic applications. These devices will have a potential for use in memory, sensors and magnetic refrigeration. Long-established participation of high-school teachers and their students in the research laboratories of the investigators will be enhanced. Graduate and undergraduate students will be educated and trained through research activities.NON-TECHNICAL SUMMARY:The magnetic shape-memory effect in Heusler alloy films will be used to explore physical behaviors of these alloys alone and when paired with other materials to make a functional device. It is ultimately envisioned that this research may lead to a new class of nanoferroic multifunctional devices enabling new sensor and electronic applications. These devices will have a potential for use in memory, sensors and magnetic refrigeration. Long-established participation of high-school teachers and their students in the research laboratories of the investigators will be enhanced. Graduate and undergraduate students will learn nanofabrication techniques, chemical synthesis, sensitive electrical measurements, and theory of quantum transport and magnetization dynamics, providing hands-on experience suitable for their further research and development in leading industrial and academic laboratories.

技术摘要：该项目的目标是展示一种新的纳米铁性多功能器件，该器件基于铁电异质结中的形状记忆Heusler合金膜，其中Heusler合金的电阻，磁性和结构特性将通过施加电场进行切换。Heusler合金是一类具有独特电磁行为的金属间化合物，其中包括磁形状记忆效应。 选定的形状记忆Heusler合金预计将优于锰基化合物，因为它们的转变可以控制在室温附近发生。本研究试图区分异质结层之间的电子和应变介导的耦合的作用，以确定每个效果的起源。并对Heusler合金膜中马氏体相变的机制进行了初步探讨。最终设想，这项研究可能会导致一类新的纳米铁多功能器件，使新的传感器和电子应用。这些设备将有可能用于存储器，传感器和磁制冷。将加强长期以来高中教师及其学生对调查人员的研究实验室的参与。研究生和本科生将通过研究活动接受教育和培训。非技术性总结：Heusler合金薄膜中的磁性形状记忆效应将用于探索这些合金单独以及与其他材料配对时的物理行为，以制作功能性设备。最终设想，这项研究可能会导致一类新的纳米铁多功能器件，使新的传感器和电子应用。这些设备将有可能用于存储器，传感器和磁制冷。将加强长期以来高中教师及其学生对调查人员的研究实验室的参与。研究生和本科生将学习纳米纤维技术，化学合成，灵敏的电学测量，量子传输和磁化动力学理论，为他们在领先的工业和学术实验室的进一步研究和开发提供实践经验。