Evolution of magnetoelasticity from a single-atom bridge to bulk

磁弹性从单原子桥到块体的演变

• 批准号: 1309712
• 负责人: Harsh Chopra
• 金额: $ 56万
• 依托单位: SUNY at Buffalo
• 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: 2013-06-15 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1309712&HistoricalAwards=false
• 关键词: Evolution; magnetoelasticity; single; atom; bridge

****Technical Abstract****This project will experimentally map the evolution of magneto-elasticity in ferromagnets from a single-atom to bulk. This will be accomplished by using a custom built probe that is capable of making stable atomic-sized samples as small as a single-atom bridge, an atomic chain or atomic clusters, and measure their interatomic forces and distortions with pico-level resolution under applied field, mechanical perturbations, and as a function of temperature. The project will focus on iron, cobalt, nickel, terbium and gadolinium, which are key components of all magnetic actuator materials. By pinpointing the length scales where enhanced magnetoelasticity occur will lead to new strategies for "materials by design" and development of new alloys with enhanced actuation. The project will support education of two graduate students. Training of graduate students in thin films and vacuum technology, nano-science and nanofabrication is of direct relevance to wealth generating high-tech companies and opens vast opportunities for students upon graduation. The project will also host 1-2 high school or undergraduate students through university's Louis Stokes Alliance for Minorities Program. The project will also offer outreach to a startup company that seeks to commercialize the probe used to conduct experiments in this project.****Non-Technical Abstract****The ability of magnetic materials to precisely expand or contract in a magnetic field makes them highly useful as sensors and actuators in industries ranging from automobile, aerospace, data storage, to satellites and telecommunication systems. There is urgent need to create new magnetic alloys that can exhibit larger displacements or exert higher forces in a magnetic field. This project will experimentally map the evolution of this actuation ability in magnets, starting with samples as small as a single atom bridge or an atomic chain, to bulk. This will be accomplished by using a custom built probe capable of making atomic sized samples and measure forces and displacements with sub-nanometer accuracy. The project will focus on iron, cobalt, nickel, terbium and gadolinium, which are key components of all magnetic actuators and sensors. Pinpointing the optimum size for highest actuation will lead to new strategies for "materials by design" and development of advanced alloys. The project will support education of two graduate students and 1-2 undergraduate students whose training in thin films and vacuum technology, nano-science and microfabrication is highly sought after by wealth generating high tech companies. The project will also offer help to a startup company that is commercializing the probe used for experiments in this project.

****技术摘要****本项目将通过实验绘制铁磁体从单原子到体的磁弹性演化图。这将通过使用定制的探针来完成，该探针能够制作稳定的原子大小的样品，小到单原子桥，原子链或原子簇，并在应用场，机械扰动和温度的函数下以微米级分辨率测量它们的原子间力和扭曲。该项目将重点研究铁、钴、镍、铽和钆，它们是所有磁致动器材料的关键成分。通过精确定位磁弹性增强发生的长度尺度，将导致“设计材料”和开发具有增强驱动的新合金的新策略。该项目将支持两名研究生的教育。培养薄膜和真空技术、纳米科学和纳米制造方面的研究生与创造财富的高科技公司直接相关，并为毕业后的学生提供了巨大的机会。该项目还将通过大学的路易斯·斯托克斯少数民族联盟项目招收1-2名高中生或本科生。该项目还将向寻求将该项目中用于进行实验的探测器商业化的初创公司提供服务。****非技术摘要****磁性材料在磁场中精确膨胀或收缩的能力使它们在汽车、航空航天、数据存储、卫星和电信系统等行业中作为传感器和执行器非常有用。目前迫切需要制造出能够在磁场中表现出更大位移或施加更大力的新型磁性合金。该项目将通过实验绘制磁体中这种驱动能力的演变图，从小到单原子桥或原子链的样品开始，直到整体。这将通过使用定制的探针来完成，该探针能够制作原子大小的样品，并以亚纳米精度测量力和位移。该项目将重点关注铁、钴、镍、铽和钆，它们是所有磁致动器和传感器的关键成分。精确确定最高驱动的最佳尺寸将为“设计材料”和先进合金的开发带来新的策略。该项目将支持两名研究生和1-2名本科生的教育，这些学生在薄膜和真空技术、纳米科学和微制造方面的培训受到创造财富的高科技公司的高度追捧。该项目还将为一家初创公司提供帮助，该公司正在将该项目中用于实验的探测器商业化。