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

0234032 Kojima该奖项支持新玩法罗格斯大学的Haruo Kojima教授和日本东京大学固体物理研究所（ISSP）的Hidehiko Ishimoto教授之间为期三年的合作研究项目。 他们将进行极化超流体中自旋流体流动动力学的研究。 一种新的机械自旋密度探测器技术已经发展用于探测自旋输运和弛豫效应的性质。 该技术将被应用于研究两种不同磁性的材料状态之间的不寻常的自旋输运和扩散。 早期的实验和分析表明，磁性超流体与另一种超流体或正常流体之间的“界面”的存在表现出非常不同的自旋弛豫机制。 建议通过测量完全消除界面的布置中的自旋弛豫来提供对界面的重要性的直接测试。 新的自旋过滤器实验将增加自旋极化到比过去可能的更大的程度。 将创建具有大的非平衡极化的流体状态，并研究其动力学。 该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。 美国研究人员提供自旋流体流动动力学实验的专业知识，日本研究人员提供高磁场超低温的专业知识。 自旋相关输运的研究对于自旋电子学器件的发展具有重要意义。 这些研究还具有结构简单的优势，因为易于改变材料条件和涉及的时间尺度较长。 这也将有助于更好地理解自旋电子学。 该项目通过一些研究生的参与促进了国际人力资源的发展，这些研究生将获得超低温物理学和材料物理学领域最先进技术的经验。 通过交流思想和技术，该项目将扩大我们的基础知识，促进国际理解与合作。 研究结果将在科学会议和科学期刊上传播。

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.