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

目标：次分辨率磁记录在10 Terrabit/inch 2智力优点：研究雇用写和读头低于分辨率操作的建议。 原始用户数据将使用由Roger Wood及其同事提出的二维（跨磁道和下磁道方向）信号处理来重建。将采用多个通道位，例如，40太比特/英寸2的信道比特表示10太比特/英寸2的用户数据。 拟议的研究包括寻找一个可行的安排读传感器和探索写头设计适合这种非常高的密度。 提出了使用横向范围大大超过磁道宽度的双磁阻感测头。 它们将被布置成与磁道成倾斜角的线性阵列，从而允许每个磁头对不同的读取磁道组敏感，并且从每个磁道提取信号。 将使用两个微磁代码检查写入头的各种方法。 一个特别有趣的想法是使用反铁磁耦合的次级磁极来最大化梯度。 最终目标是测试这种使用磁头和介质的二维磁记录的想法，这些磁头和介质旨在优化其性能。拟议的研究代表了明尼苏达大学教授Randall Victora（磁学）和希捷工程师Alfreh Erden（信号处理）之间的合作成果。 该计划涉及多次迭代，每次迭代都包括使用新型写入头架构在复合介质上微磁性写入的编码信号（由Erden博士提供）。 然后，读取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Seagate关于性能和故障原因的反馈结束。 这将导致新的磁设计和/或信号处理算法，以及新的迭代。更广泛的影响：拟议中的研究将影响三个重要的群体：本科生谁想要了解研究，研究生谁开始他们的研究生涯，和研究人员特别强调对行业。 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性和信号处理限制以及通过工业实习。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。 本科生将通过明尼苏达大学的本科生研究经验计划被纳入拟议的研究范围，对于特殊学生，则包括高级荣誉论文。 为了接触Seagate以外的行业，建议每年访问多家美国唱片公司。 这与年度MINT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.