GOALI: Nanoscale Characterization and Manipulation of Magnetoelastic Coupling and Magnetic Domains by Novel Quantitative Scanning Probe Microscopy

GOALI：通过新型定量扫描探针显微镜对磁弹性耦合和磁域进行纳米级表征和操纵

• 批准号: 1006194
• 负责人: Jiangyu Li
• 金额: $ 31.5万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1006194&HistoricalAwards=false
• 关键词: GOALI; Nanoscale; Characterization; Manipulation; Magnetoelastic

TECHNICAL SUMMARY: The objective of this project is to understand the dramatically enhanced magnetostriction in Galfenol, or Fe-Ga alloy, which exhibits magnetostrictive strain one order of magnitude higher than that of alpha-Fe, even though Ga is nonmagnetic. Novel piezomagnetic force microscopy (PmFM) will be developed through the collaboration between the University of Washington and Asylum Research, which will enable quantitative characterization and manipulation of magnetoelastic coupling and magnetic domains with high sensitivity, high spatial resolution, and minimized cross-talk with topography. Magnetostrictive response and magnetic domains of Galfenol will be mapped and manipulated at the nanoscale using the proposed PmFM technique, and the obtained real space magnetoelastic response will be correlated with the underlying microstructure of Galfenol determined from detailed structural analysis. Modeling and simulation of the configuration and evolution of magnetic domains and transforming microstructures of Galfenol will also be carried out to link the nanoscale magnetostrictive response and macroscopic magnetostriction measurement. Through the tightly coupled experimental and theoretical investigations, the project will help to clarify the microscopic mechanism responsible for the enhanced magnetostriction in Galfenol.NON-TECHNICAL SUMMARY: Magnetostriction refers to magnetic field induced strain in ferromagnetic materials, and Galfenol is an emerging class of structural magnetostrictive material with excellent mechanical properties. It is promising for a wide range of applications in mechanically tough environments, such as underwater sonar transduction and damping or energy harvesting of mechanical vibrations, in which conventional giant magnetostrictive materials are not suitable because of their poor mechanical strength. The project will help to understand the microscopic mechanism responsible for the enhanced magnetostriction in Galfenol, and potentially guide the development of new structural magnetostrictive materials with even better properties. A novel scanning probe microscopy technique will also be developed, which can be applied to study a wide range of magnetic materials with enhanced sensitivity and resolution over the state of art magnetic force microscopy. Graduate and undergraduate students will be trained through integrated research and education that involve extensive collaborations with industry, and outreach activities will also be developed for high school students and teachers.

技术概述：本项目的目的是了解Galfenol或Fe-Ga合金中显著增强的磁致伸缩，即使Ga是非磁性的，其磁致伸缩应变也比α - fe高一个数量级。新型压磁力显微镜（PmFM）将通过华盛顿大学和收容所研究中心之间的合作开发，这将使磁弹性耦合和磁畴的定量表征和操作具有高灵敏度，高空间分辨率和最小化与地形的串扰。利用所提出的PmFM技术，将在纳米尺度上绘制和操纵Galfenol的磁致伸缩响应和磁畴，并将获得的真实空间磁弹性响应与通过详细结构分析确定的Galfenol的底层微观结构相关联。还将对Galfenol的磁畴构型、演化和微观结构转变进行建模和仿真，以将纳米级磁致伸缩响应与宏观磁致伸缩测量联系起来。通过紧密耦合的实验和理论研究，该项目将有助于阐明Galfenol磁致伸缩增强的微观机制。摘要：磁致伸缩是指铁磁性材料中的磁场感应应变，Galfenol是一类新兴的结构磁致伸缩材料，具有优异的力学性能。传统的超磁致伸缩材料因其机械强度差而不适合在机械恶劣环境中广泛应用，如水下声纳转导和机械振动的阻尼或能量收集。该项目将有助于了解Galfenol磁致伸缩增强的微观机制，并有可能指导具有更好性能的新型结构磁致伸缩材料的开发。一种新的扫描探针显微镜技术也将被开发出来，它可以应用于研究广泛的磁性材料，比目前最先进的磁力显微镜具有更高的灵敏度和分辨率。研究生和本科生将通过与工业界广泛合作的综合研究和教育进行培训，并为高中学生和教师开展拓展活动。