Magnons, Domain Resonances and Elastic Waves in Giant Magneto-Resistive Materials

巨磁阻材料中的磁振子、磁畴共振和弹性波

• 批准号: 9701685
• 负责人: Ratnasingham Sooryakumar
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9701685&HistoricalAwards=false
• 关键词: Magnons; Domain; Resonances; Elastic; Waves

9701685 Sooryakumar This renewal project will support the study, via inelastic light scattering methods, of exchange coupling mechanisms across magnetic interfaces separated by an ultra thin spacer layer. Special tri-layer structures with the ability to tune the Stoner exchange parameter will allow details of the spacer magnetic and electronic structure that directly controls the inter-layer exchange to be probed and provide information on the antiferromagnetic properties of ultra thin metallic films. Domain wall excitations will also be exploited to study inter-layer coupling over microscopic length scales. In addition, the strong spin-lattice and charge-lattice couplings in the mixed valence manganites will be investigated by light scattering. This effort will allow for the unusual, but decidedly important, interplay between magnetic and structural effects in these materials to be studied. %%% This renewal project will support a laser spectroscopic study of magnetism in layered structures that are likely to underlie the next generation magnetic data storage and magneto-electronic devices. The study focuses on understanding the interaction between magnetic films separated by a few atomic layers and to develop an experimental technique to probe this interaction over length scales not realized by other methods. In addition, since the electrical resistance of special manganite compounds can be tuned by a magnetic field, these materials open new perspectives into novel devices based on the spin of an electron. The underlying physics associated with the coupling between the electron spin and crystal structure of these materials will be investigated by laser light scattering methodologies. ***

小行星9701685 这一更新项目将支持通过非弹性光散射方法研究交换耦合机制 穿过由超薄间隔层隔开的磁性界面。 具有调节Stoner交换参数的能力的特殊三层结构将允许直接控制层间交换的间隔物磁性和电子结构的细节 到 被 调查并提供信息 对 超薄金属薄膜的反铁磁特性。畴壁激发也将被用来研究微观尺度上的层间耦合。此外，我们也将利用光散射来研究混合价锰氧化物中强的自旋-晶格及电荷-晶格耦合。这项工作将允许不寻常的，但绝对重要的，在这些材料的磁性和结构效应之间的相互作用进行研究。 该更新项目将支持分层结构中磁性的激光光谱研究，这些结构可能成为下一代磁性数据存储和磁电器件的基础。 该研究的重点是了解由几个原子层分离的磁性薄膜之间的相互作用，并开发一种实验技术，以探测其他方法无法实现的长度尺度上的这种相互作用。 此外，由于特殊锰氧化物化合物的电阻可以通过磁场调节，这些材料为基于电子自旋的新型器件开辟了新的前景。 与这些材料的电子自旋和晶体结构之间的耦合相关的基本物理将通过激光散射方法进行研究。 ***