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

目标：10太比特/英寸的亚分辨率磁记录。智力优势：提出了采用在分辨率以下操作的写和读磁头的研究。原始用户数据将使用Roger Wood及其同事提出的二维（交叉轨道和下行轨道方向）信号处理进行重建。将使用许多信道位，例如，40太比特/英寸2的信道位来表示10太比特/英寸2的用户数据。提出的研究包括寻找一种可行的读传感器排列和探索适合这种非常高密度的写磁头设计。提出了横向范围大大超过磁道宽度的双磁阻传感头的使用。它们将被排列成一个线性阵列，倾斜到轨道上，从而允许每个磁头对不同的一组读取磁道敏感，并从每个磁道中提取信号。将使用两个微磁码来检查写头的各种方法。一个特别有趣的想法是使用反铁磁耦合的二次极来最大化梯度。最终的目标是测试这种二维磁记录的想法，使用磁头和介质来优化其性能。这项提议的研究是明尼苏达大学教授Randall victoria（电磁学）和希捷工程师Fatih Erden（信号处理）的合作成果。该计划涉及多个迭代，每个迭代都包括一个编码信号（由Erden博士提供），该信号使用一种新颖的写头架构在复合介质上以微磁方式写入。读取头阵列获取二维信号，波形发送到希捷进行解码。迭代将以希捷关于性能和故障原因的反馈结束。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群体：想要学习研究的本科生，刚开始研究生涯的研究生，以及特别强调工业的研究人员。研究生将受益于与工业界的广泛接触，包括与希捷共同优化磁性和信号处理约束，以及通过工业实习。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工业参观者，特别是在年度审查期间。本科生将通过明尼苏达大学本科生研究经验项目纳入拟议的研究，对于优秀学生，高级荣誉论文。为了接触希捷以外的行业，希捷建议每年访问多家美国唱片公司。这与MINT年度审查一起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。

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.