Structure-Property Relationships in Colossal Magnetoresistance Thin Film Materials through Nanofabrication

通过纳米加工研究巨磁阻薄膜材料的结构-性能关系

• 批准号: 0102621
• 负责人: Yuri Suzuki
• 金额: $ 30.27万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0102621&HistoricalAwards=false
• 关键词: Structure; Property; Relationships; Colossal; Magnetoresistance

This project seeks greater understanding of the spin, charge and lattice coupling in a class of ferromagnetic cubic perovskite materials known as "colossal" magnetoresistance (CMR) materials through nanofabrication and characterization. The project also emphasizes the development of integrated research and educational opportunities at both the undergraduate and graduate levels. The magnetoresistive response of ferromagnetic cubic perovskite materials such as (La,Sr)MnO3 is extremely sensitive to lattice strain and thus to structural distortion. Correlating structural distortions with magnetic and electronic properties is particularly important in shedding light on the origin of the anomalously large magnetoresistance effect observed. This project specifically addresses (i) the relationship between local magnetic structure and the strain state through geometrical confinement and (ii) the magnetotransport in submicron size device heterostructures. The strain state of CMR materials can be tailored by geometrical confinement through nanofabrication and the resulting nanostructures will be characterized magnetically and electronically. This approach provides information not only on the interplay between structure and magnetics behind the anomalously large magnetoresistance in these materials but also on the fundamental quantum limit of their incorporation into magnetic recording applications as magnetic media become denser.%%%The project addresses basic research issues in a topical area of materials science having high potential technological relevance. The research will contribute basic materials science knowledge at a fundamental level to new aspects of magnetic devices. The basic knowledge and understanding gained from the research is expected to contribute to improving the perform-ance and stability of advanced devices by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area.***

该项目旨在通过纳米结构和表征更好地了解一类铁磁立方钙钛矿材料（称为“巨大”磁阻（CMR）材料）中的自旋，电荷和晶格耦合。该项目还强调在本科生和研究生两级发展综合研究和教育机会。铁磁立方钙钛矿材料，如（La，Sr）MnO 3的磁阻响应是非常敏感的晶格应变，从而结构畸变。将结构畸变与磁性和电子性质联系起来，对于揭示所观察到的巨大磁阻效应的起源特别重要。这个项目具体涉及（i）局部磁结构和应变状态之间的关系，通过几何约束和（ii）在亚微米尺寸的器件异质结构的磁输运。CMR材料的应变状态可以通过纳米纤维的几何约束来定制，并且所得纳米结构将被磁性和电子地表征。这种方法不仅提供了这些材料中巨大磁阻背后的结构和磁性之间相互作用的信息，而且还提供了随着磁介质变得更致密，将其纳入磁记录应用的基本量子极限的信息。该项目涉及材料科学专题领域的基础研究问题，具有很高的潜在技术相关性。该研究将为磁性器件的新方面提供基础材料科学知识。从研究中获得的基本知识和理解有望通过为设计和生产改进的材料和材料组合提供基本理解和基础，有助于提高先进器械的性能和稳定性。 该计划的一个重要特点是通过在一个基本和技术上重要的领域对学生进行培训来整合研究和教育。