GOALI: Sub-Resolution Magnetic Recording at 10 Terrabits/inch2

目标：10 Terrabits/inch2 的亚分辨率磁记录

• 批准号: 0925366
• 负责人: Randall Victora
• 金额: $ 28.17万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0925366&HistoricalAwards=false
• 关键词: GOALI; Sub; Resolution; Magnetic; Recording

GOALI: Sub Resolution Magnetic Recording at 10 Terrabit/inch2Intellectual Merit: Research employing write and read heads operating below resolution is proposed. The original user data will be reconstructed using two dimensional (cross-track and down-track directions) signal processing as proposed by Roger Wood and coworkers. Numerous channel bits will be employed, e.g., 40 Terrabits/inch2 of channel bits to represent 10 Terabits/inch2 of user data. The proposed research includes searching for a workable arrangement of read sensors and exploring write head designs suitable for this very high density. The use of dual magnetoresistive sense heads with lateral extent considerably exceeding the track width is proposed. They will be arranged in a linear array tilted at a skew angle to the track, thus allowing each head to be sensitive to a different set of read tracks and the signal from each track to be extracted. A variety of approaches for the write head will be examined using two micromagnetic codes. A particularly interesting idea is the use of an antiferromagnetically coupled secondary pole to maximize gradient. The ultimate goal is to test this idea of two dimensional magnetic recording using magnetic heads and media that are designed to optimize its performance.The proposed research represents a collaborative effort between University of Minnesota Professor Randall Victora (magnetics), and Seagate engineer Fatih Erden (signal processing). The plan involves multiple iterations, each including an encoded signal (provided by Dr. Erden) written micromagnetically on composite media using a novel write head architecture. The two dimensional signal will then be obtained by the read head array and the waveforms will be sent to Seagate for decoding. The iteration will end with feedback from Seagate about the performance and causes of failure. This will lead to a new magnetic design and/or signal processing algorithm, and a new iteration. Broader Impact: The proposed research will impact three important constituencies: undergraduate students who want to learn about research, graduate students who are beginning their research careers, and fellow researchers with particular emphasis towards industry. Graduate students will benefit from extensive contact with industry including joint optimization of magnetic and signal processing constraints with Seagate and through industrial internships. The interdisciplinary environment of the Center for Micromagnetics and Information Technology (MINT) will also expose them to students from other disciplines and a large number of industrial visitors, particularly at the Annual Review. Undergraduates will be included within the proposed research through the Research Experience for Undergraduates program at the University of Minnesota and, for exceptional students, Senior Honors Theses. In an effort to reach industries beyond Seagate, a visit to multiple U.S. based recording companies is proposed for each year. This, together with the Annual MINT Review will allow industrial researchers an opportunity to discuss detailed research results with the investigators.

目标：10太比特/英寸的亚分辨率磁记录技术优点：建议使用低于分辨率的读写磁头进行研究。按照Roger Wood及其同事的建议，原始用户数据将使用二维(交叉轨道和下行轨道方向)信号处理进行重建。将使用许多信道比特，例如40太比特/英寸2的信道比特来表示10太比特/英寸2的用户数据。建议的研究包括寻找一种可行的读传感器布置和探索适合于这种非常高密度的写头设计。建议使用横向范围大大超过磁道宽度的双磁阻传感磁头。它们将排列在与磁道成倾斜角度的线性阵列中，从而允许每个磁头对一组不同的读取磁道敏感，并且从每个磁道提取信号。将使用两个微磁码检查用于写头的各种方法。一个特别有趣的想法是使用反铁磁耦合的次级极来最大化梯度。最终目标是使用磁头和介质来测试这种二维磁记录的想法，这些磁头和介质旨在优化其性能。这项拟议的研究是明尼苏达大学教授兰德尔·维克托拉(磁学)和希捷工程师法提赫·埃尔登(信号处理)共同努力的结果。该计划涉及多次迭代，每次迭代都包括一个编码信号(由Erden博士提供)，该编码信号使用一种新颖的写头架构以微磁方式写入在复合介质上。然后，读取磁头阵列将获得二维信号，并将波形发送到希捷进行解码。迭代将以希捷对性能和失败原因的反馈结束。这将导致新的磁性设计和/或信号处理算法，以及新的迭代。更广泛的影响：拟议的研究将影响三个重要的群体：想要了解研究的本科生，开始研究生涯的研究生，以及特别强调行业的研究伙伴。研究生将从与行业的广泛接触中受益，包括与希捷联合优化磁力和信号处理限制，以及通过行业实习。微磁学和信息技术中心(MINT)的跨学科环境也将使他们接触到来自其他学科的学生和大量的行业访客，特别是在年度审查中。本科生将通过明尼苏达大学的本科生研究经验计划被包括在拟议的研究中，对于优秀学生，将被包括在高级荣誉论文中。为了努力触及希捷以外的行业，建议每年访问多家总部位于美国的唱片公司。这一点，再加上年度薄荷审查，将使工业研究人员有机会与调查人员讨论详细的研究结果。