Novel Electron Transport Studies of Metallic Multilayers at Low Temperatures

9423795 Pratt该研究项目扩展了基于他们的开创性方法的研究，以研究人工结构的铁磁性和非磁性多层膜中的巨磁电阻（GMR）。 该技术涉及电流垂直于多层膜平面流动的低温测量，并被称为CPP-MR。这些测量显示出比类似面内测量（CIP-MR）更大的磁电阻，并且还提供了对基本自旋相关散射参数和界面比电阻的更直接的访问。 本研究将比较CPP-MR 和 相同铁磁/非磁界面上的CIP-MR测量。 已经开发了新的方法来分析这些数据，以提取基本 信息 关于 磁 接口。 在信息存储技术领域中磁性多层膜的应用背景下，该信息也具有很大的当前兴趣。 %非技术性 摘要： 适当 制造 由磁性和非磁性金属的交替层组成的磁性多层，每一层只有几个原子厚，具有在施加磁场时其电阻急剧减小的特性。因此，它们可用于检测非常小的磁场。再加上它们体积小、响应快，这种能力使它们成为人们感兴趣的录音 信息提取行业 更高密度磁盘和磁带的未来一代。它们还显示出用于确定汽车发动机部件的位置或转速的前景。该项目的重点是更好地理解所涉及的基本物理现象，以便实现定制磁性多层膜以满足特定技术需求的能力。目前的研究小组已经率先开发了独特的技术来发展这种理解。 这些技术将在本项目中进一步完善并应用于新材料。 ***

9423795 Pratt This research project extends research based on their has pioneering approach to the study of giant magnetoresistance (GMR) in artificially structured multilayers of ferromagnetic and non- magnetic multilayers. The technique involves low temperature measurements with current flow perpendicular to the multilayer planes, and is termed CPP-MR. These measurements exhibit larger magnetoresistance than analogous in-plane measurements (CIP-MR), and also provide more direct access to the fundamental spin- dependent scattering parameters and to the interface-specific resistance. The research will compare CPP-MR and CIP-MR measurements on the same ferromagnetic/non-magnetic interface. New methods have been developed to analyze such data to extract fundamental information about magnetic interfaces. This information is also of great current interest in the context of applications of magnetic multilayers in the field of information storage technology. %%% Non-Technical Abstract: Appropriately fabricated magnetic multilayers, composed of alternating layers of magnetic and non- magnetic metals, each only a few atoms thick, have the property that their electrical resistance decreases drastically upon application of a magnetic field. They can thus be used to detect very small magnetic fields. Combined with their small size and fast response, this capability has made them of interest to the recording industry for extracting information from future generations of higher density magnetic disks and tapes. They also show promise for use in determining position or speeds-of- rotation of auto engine components. This project focuses on better understanding the fundamental physical phenomena involved, so as to achieve the ability to tailor magnetic multilayers to meet specific technological needs. The present research group has pioneered unique techniques for developing such understanding. These techniques will be further improved and applied to new materials in the current project. ***