GOALI: Magnetic Thin-Films for Data Storage

GOALI：用于数据存储的磁性薄膜

• 批准号: 9802278
• 负责人: Richard Kurtz
• 金额: $ 20万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802278&HistoricalAwards=false
• 关键词: GOALI; Magnetic; Thin; Films; Data

Kurtz9802278This is a GOALIE proposal involving a collaboration between a physicist at Louisiana State University and collaborators at Hewlett-Packard Laboratories and Seagate Technology. The research relates to magnetic data storage devices that currently incorporate thin film giant magnetoresistive (GMR) sensors, constructed from magnetic and non-magnetic materials. Particular combinations of materials give rise to enhanced sensitivity to magnetic bits which are detected by changes in resistance. Students will be sent to HP and Seagate Laboratories to grow films, characterize their magnetic and transport properties, and develop transferable methods to compare films grown at different institutions. At LSU, the growth characteristics of the films will be evaluated with scanning tunneling microscopy, while magnetic characteristics will be evaluated using the magneto-optical Kerr effect. The electronic band structures will be characterized at the LSU Synchrotron Center for Advanced Microstructures and Devices (CAMD), using an array of synchrotron based techniques such as angle- and spin-resolved photoemission, valence-band dichroism, and Fermi surface mapping using a display analyzer. The materials studied include 3d transition metals and alloy films on single-crystal substrates such as Cu(001), or on oxides grown in situ. Theoretical studies suggest that improved sensitivity may be achieved by using half-metallic materials, such as Fe3O4 and CrO2, in spin-tunneling devices; such materials will be investigated as well. The project will provide excellent training for undergraduate and graduate students in fundamental and technical areas of condensed matter physics.%%%This is a GOALIE proposal involving a collaboration between a physicist at Louisiana State University and collaborators at Hewlett-Packard Laboratories and Seagate Technology. Magnetic sensors in computer disk drives are now being fabricated by combining atomically-thin magnetic and non-magnetic films into layered structures with improved sensitivity, allowing bit sizes to shrink and capacity to increase. The fundamental properties of the thin films differ significantly from bulk materials, however. This project focuses on experimental characterization of the new electronic structures and their relationship to the improved magnetic performance. LSU students will grow films in industrial and university facilities and characterize the magnetic and electrical characteristics of these devices. Research conducted at LSU involves atomic-scale characterization of the film growth properties using scanning-tunneling microscopy and magnetic characterization by observations of the degree to which polarized light is rotated on reflection. At the LSU Center for Advanced Microstructures and Devices (CAMD) synchrotron, students will evaluate the new electronic structures that arise by monitoring the energies and angles of electrons emitted from the surfaces under intense soft x-ray irradiation. These data will be compared with theoretical models of the electronic structure, providing the feedback that is required in the process of developing new magnetic materials. The project will provide excellent training for undergraduate and graduate students in fundamental and technical areas of condensed matter physics.

Kurtz9802278这是一项守门员建议，涉及路易斯安那州立大学的物理学家与Hewlett-Packard Laboratories和Seagate Technology的合作者之间的合作。该研究涉及磁性数据存储设备，这些存储设备当前结合了由磁性和非磁性材料构建的薄膜巨磁磁性（GMR）传感器。材料的特定组合会导致对磁性局部的敏感性增强，这些磁位被电阻变化检测到。学生将被派往HP和Seagate实验室，以发展电影，表征其磁性和运输特性，并开发可转移的方法以比较在不同机构中生长的电影。在LSU，将通过扫描隧道显微镜评估膜的生长特性，同时将使用磁光kerr效应评估磁性特征。电子带结构将使用一系列基于同步加速器的技术，例如角度和自旋分辨光发射，价值波段二色性和FERMI表面映射，使用一系列基于同步加速器的技术来表征高级微观结构和设备（CAMD）的LSU同步器中心（CAMD）。研究的材料包括在单晶底物（例如Cu（001））或原位生长的氧化物上的3D过渡金属和合金膜。理论研究表明，通过在自旋隧道设备中使用半金属材料（例如Fe3O4和CRO2）可以提高灵敏度。此类材料也将进行研究。该项目将为凝聚态物理学的基本和技术领域的本科和研究生提供出色的培训。%% %%这是一项守门员建议，涉及路易斯安那州立大学的物理学家与惠普实验室合作者之间的合作，并进行了合作。现在，通过将原子上的磁性和非磁性膜组合到具有提高灵敏度的分层结构中，可以通过将磁盘驱动器中的磁性传感器组合起来，从而使位尺寸缩小和增加的能力增加。但是，薄膜的基本特性与散装材料有很大不同。该项目着重于新电子结构的实验表征及其与改善磁性性能的关系。路易斯安那州立大学的学生将在工业和大学设施中发展电影，并描述这些设备的磁性和电气特性。 在LSU上进行的研究涉及通过扫描键盘显微镜和磁性表征对膜生长特性的原子尺度表征，通过观察到反射时偏振光旋转的程度。在LSU高级微观结构和设备（CAMD）同步器中心，学生将通过监测强烈的软X射线照射下从表面发出的电子和角度来评估出现的新电子结构。这些数据将与电子结构的理论模型进行比较，从而提供了开发新磁性材料过程中所需的反馈。该项目将为凝结物理学的基本和技术领域的本科和研究生提供出色的培训。