U.S.-Japan Cooperative Science: Spin Fluid Flow Dynamics in Polarized Superfluid

美日合作科学：极化超流体中的自旋流体流动动力学

• 批准号: 0234032
• 负责人: Haruo Kojima
• 金额: $ 2.16万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-15 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0234032&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Science; Spin

0234032KojimaThis award supports a three-year collaborative research project between Professor Haruo Kojima at Rutgers University in New Brunswick and Professor Hidehiko Ishimoto at the Institute of Solid State Physics (ISSP) of the University of Tokyo in Japan. They will be undertaking research on spin fluid flow dynamics in polarized superfluid. A novel mechanical spin density detector technique has been developed for probing the nature of spin transport and relaxation effects. The technique will be applied to study the unusual spin transport and diffusion across two material states with different magnetic properties of their model system. Earlier experiments and analysis indicated that the presence of "interface" between the magnetic superfluid and either another superfluid or normal fluid exhibits very different mechanisms of spin relaxation. It is proposed to provide a direct test on the importance of the interface by measuring the spin relaxation in an arrangement which eliminates the interface altogether. The new spin filter experiment will increase spin polarization to much greater degree than possible in the past. A fluid state with large non-equilibrium polarization will be created and its dynamics will be studied. The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The U.S. researchers provide expertise in the spin fluid flow dynamics experiments and the Japanese researchers provide expertise in ultra low temperature with a high magnetic field. Studies on spin dependent transport are important in advancing towards spintronics devices. The studies also have advantages in simpler structures because of the ease of changing material conditions and longer time scale involved. This would also contribute towards a better understanding of spintronics. The project advances international human resources through the participation of a number of graduate students who will gain experience in the state of art technology in ultra low temperature physics and materials physics. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. Results of the research will be disseminated at scientific meetings and in scientific journals.

0234032KOJIMATHIS奖支持新不伦瑞克省Rutgers University的Haruo Kojima教授与日本东京大学固体州物理学研究所（ISSP）的Hidehiko Ishimoto教授之间的为期三年的合作研究项目。 他们将在极化超流体中对自旋流体流动动力学进行研究。 已经开发了一种新型的机械自旋密度检测器技术，用于探测自旋传输和松弛效应的性质。 该技术将应用于研究模型系统具有不同磁性特性的两个材料状态的异常自旋传输和扩散。 较早的实验和分析表明，磁性超流体和另一种超氟或正常流体之间存在“界面”的存在非常不同的自旋松弛机制。 提议通过在整个排列中测量自旋松弛，从而直接测试界面的重要性，从而完全消除了界面。 新的自旋滤波器实验将使自旋极化比过去更大。 将创建具有较大非平衡极化的流体状态，并将研究其动力学。 该项目汇集了具有互补专业知识和研究能力的两个实验室的努力。 美国研究人员在自旋流体流动动力学实验方面提供了专业知识，日本研究人员在高磁场上提供了超低温度的专业知识。 关于旋转依赖运输的研究对于迈向旋转型设备的发展很重要。 由于易于变化的材料条件和较长的时间尺度，这些研究在更简单的结构中也具有优势。 这也将有助于更好地理解自旋形式。 该项目通过许多研究生的参与来推动国际资源，他们将在超低温度物理和材料物理学方面获得最先进的技术经验。 通过思想和技术的交流，该项目将扩大我们的基础知识基础，并促进国际理解与合作。 该研究的结果将在科学会议和科学期刊上传播。