高道密度垂直磁记录单极头读出过程的理论分析

本文对高道密度垂直磁记录单极头的读出过程进行了理论分析，考虚到垂直磁记录方式的记录位长远小于单极型磁头厚度，在不计及漏磁的情况下，用镜像法简化地推导了双层膜窄道宽垂直磁记录单极头读出波形电压表达式，由此可以看出影响垂直磁记录单极头磁记录系统实现高道密度的因素。     

磁光记录的现状及其发展趋势

减小道间距和采用分区恒角速度技术实现了第一代磁光盘到第二代磁光盘的飞跃。坑缘记录方式、超高磁分辩证技术、短波长激光二级管和直接改写技术的应用，将使下一代磁光盘的存储容量和数传率成倍增长。本文介绍最新的磁光记录技术，估计其对光盘存储容和数传摔的增长程度，并预测磁光盘存储容量的发展趋势。     

磁光盘脉冲宽度调制记录的研究

脉冲宽度调制记录方式是第三代光盘提高容量的主要方式，而记录过程中信号的边沿抖动是实现这种记录方式的主要障碍。本文分析磁光记录通道中的抖动特性，介绍了磁光盘脉宽调制记录在读写通道上的改进技术，并探讨以后的研究发展方向。     

光记录通道中记录密度与均衡器的关系

文中建立了便于理论分析的光记录读出信号模型和离散通道模型。对均衡器对记录密度的影响进行了分析，证明了判决反馈均衡器比线笥均衡器提高记录密度约５０％。     

一种旨在提高磁盘驱动器道密度的光记录系统结构

在磁盘驱动器中借助光伺服技术可以大幅度提高道密度我们的方法是；采用光刻工艺，在磁盘上记录高精度有磁，无磁伺服图形，通过磁头读取伺服信息。本文设计了用于刻写伺服图形的光记录系统。该系统可以完成６３５０ＴＰＩ磁盘的刻录。     

高道密度垂直磁记录环形头读出过程的理论分析

本文从理论上对高道密度垂直磁记录环形头读出电压进行了计算，并对道间串扰进行了分析。     

多层神经网络的样本记忆能力

本文论述了前馈型网络,隐节点层进行线性独立变换的能力.严格证明了Mirchandani等关于隐节点在输入空间划分出区域数的定理.给出多层前馈型神经网络采用单位阶跃和连续渐近激发函数两种情况下,实数值样本绝对记忆能力的两个定理.     

Readout signal evaluation of optical flying head slider with visible light-wave guide flexure

 The need for both higher recording density and faster transfer rates continues to propel the research and development of high-performance storage equipment. The optical first-surface recording method promises to overcome tough optical diffraction limits and/or wavelength-shortening limits. We have already proposed a novel compact optical head suspension assembly combining a flying optical slider with a resin-based flexible light-wave guide flexure, and we have confirmed this assembly's stable flying performance during head-arm out-of-plane disturbances. Following this technical progress, we here describe the successful detection of optical signals of sub-micron-size bits by flying this slider above a metal patterned medium through spacing of several tens of nanometers. Signal amplitude dependencies upon both bit pattern lengths and spacings are evaluated in detail, and it is predicted that sub-micron-long and -wide bit will be able to detect increasing the incident laser power up to its maximum value of several mW in our system. Received: 22 June 2001/Accepted: 1 November 2001     

Patterned media for future magnetic data storage

One strategy to delay the onset of superparamagnetism and achieve magnetic storage densities approaching 1 Tb/in.² is the use of lithographically patterned magnetic media. While one of the main advantages enjoyed by magnetic recording is low cost due to use of featureless media, there are several advantages that may be realized by patterning the medium in a hard disk drive. The commercial success of patterned media will of course depend on the relative costs and gains. In particular, there are three main types of disk patterning proposed, each requiring a different length scale of patterned feature. Patterning of servo marks for maintaining the head position on-track, the fabrication of discrete tracks, and the fabrication of discrete bits have all been proposed and will be discussed. For discrete bit recording single domain magnetic islands are required, and one approach to fabricating these, by depositing magnetic films onto prepatterned substrates, is described. The switching characteristics of the islands as compared to those of the full film, along with initial recording results are presented.