硬盘磁头-碟界面润滑剂失效机理及添加剂X-1P的性能研究

采用热重分析 (TGA)、傅立叶红外光分析 (FTIR)和磁头起飞降落 (CSS)等试验方法 ,研究了硬盘磁头 碟界面润滑层PFPE的失效机理以及添加剂X 1P在磁头 碟界面润滑剂中的作用 .研究结果表明 ,高温条件下磁头材料Al2 O3 会诱导磁头 碟界面润滑剂PFPE发生歧化降解 ,造成磁头 碟界面润滑层失效 ;添加剂X 1P因其特殊的分子结构和化学性能 ,可作为一种有效稳定剂添加到磁头 碟润滑剂PFPE中 ,减弱磁头材料Al2 O3 作为催化反应中心的催化反应活性 ,减缓磁头 碟界面润滑剂PFPE的高温歧化降解 ,改善磁头 碟界面的CSS性能     

DVR计算机数字监控系统

数字硬盘刻录机（DVR）计算机数字监控系统以计算机为操作平台，集视频采集、数字采集、压缩技术、多媒体技术、通讯控制技术于一体。在一台数字监控主机上能够采集多达十几到几十路的实时视频图像，同屏显示多路画面，并能够实现1路或多路画面切换；通过鼠标直接控制云台的运动方位和镜头的焦距等，能够方便快捷的实现检索功能，快速查找所需监控图像。     

硬盘驱动器巨磁电阻(GMR)磁头:从微米到纳米

近年来电脑硬盘存储密度的飞速增长(年增长100％)已超出摩尔定律的预言．这种惊人的高速增长中，最关键的因素是自旋阀纳米多层膜结构，即巨磁电阻(GMR)读传感器磁头的应用．事实上，巨磁电阻磁头读传感器(reader sensor)已经实现由微电子器件向纳米电子器件转化，并且形成大规模产业．这一过程包含了自旋电子学、材料科学、微电子工程学、化学、微机械力学和工程学等诸学科和相关微加工技术综合性挑战极限，进入纳米科技领域实质性进步．     

巨磁电阻材料与信息存储及其对化学的挑战

介绍了巨磁电阻材料在信息存储中用于硬盘驱动器读出磁头的巨大应用前景，讨论了当今采用化学方法制备和研究这类材料的进展及存在的问题。     

磁头/磁盘滑动接触下磁盘温度及热退磁临界条件的研究

采用二维轴对称有限元模型计算磁头/磁盘滑动接触下,铝质磁盘的稳态温度和热应力场以及热退磁临界条件.结果表明:磁盘温度在极短时间内升至摩擦稳态值,然后缓慢线性升高到最终稳态值;经过充分热传导和热交换后磁盘的温度梯度较小,此时磁层内的热应力集中分布于磁盘固定端边缘附近;磁盘的稳态温度和热应力均随速度增大而增大,且载荷越大其值增大越快;热应力小于1.2 GPa时所对应的速度和载荷为安全工况;温升大于373 K时所对应的工况将导致磁盘退磁.     

巨磁电阻效应——2007年诺贝尔物理学奖简介

瑞典皇家科学院宣布，法国科学家阿尔伯特·费尔（Albert Vert）和德国科学家彼得·格鲁伯格（Peter Grunberg），共同获得2007年诺贝尔物理学奖．获奖的原因是这两位科学家先后独立发现了“巨磁电阻”（giant magnetoresistance，GMR）效应．这个发现引发的技术进步极大地提高了计算机硬盘磁头的数据读取能力，使硬盘无论从容量还是体积上都产生了质的飞越．这个发现还导致了新一代磁传感器的出现，而且巨磁电阻被认为是纳米技术最重要的应用之一．     

用激光代替磁头写入数字信息

荷兰和日本的物理学家利用圆极化超短激光脉冲首次实现激光对磁比特的直接写入．通常的磁光存贮设备，激光是无法直接对磁存贮单元进行读写的，必须有磁装置的辅助．而这种用激光直接写磁比特的方式，比目前最快的磁存贮器还要快5万倍，这个进展将导致低价位超高速全激光磁硬盘的出现．     

极端为任意角的记录磁头场理论的研究

本文用Schwartz-Christoffel变换法,研究极端为任意角度的磁头场的空间分布,给出一般实数型的理论公式,并进行数值解和讨论。 关键词：     

磁电子学讲座 第六讲 巨磁电阻效应在信息存储等领域中的应用

用巨磁电阻材料构成磁电子学新器件，已开始在信息存储领域成功地获得了应用．文章介绍了用于计算机硬磁盘驱动器的巨磁电阻磁头和巨磁电阻随机存储器，描述了它的工作原理、性能特点及发展趋势．指出巨磁电阻材料在传感器方面的应用也令人瞩目，有着广阔的市场前景．     

硬盘磁头-碟界面润滑剂失效机理及添加剂X-1P的性能研究

As a key part of Hard Disc（HDI）,the thin film of lube is possibly degraded and destroyed by the interaction between the magnetic head and disk during the hard disk working. Both TGA and FTIR are used to study lubes failure mechanism of HDI and investigate the function of X-1P as an additive in HDI lube. TGA experiment results show that the sample PFPE / X-1P / Al2O3 is much more stable than the sample PFPE / Al2O3 just as sample PFPE,and the sample PFPE / Al2O3 will degrade with high speed at enough high temperature. FTIR experiments present the results similar to that of TGA experiments. From IR sorption spectra at different heating times for the three samples,it can be found that the sample PFPE & the sample PFPE / X-1P / Al2O3 are similarly stable,but different from the sample PFPE / Al2O3 for which new CF = O absorption peak appeared after heated for 15 min and became stronger with the extending for heating time. FTIR experiment results further verifies that alumina is a catalyst for PFPE degradation reaction and X-1P can effectively passivate the catalyst and stabilize PFPE. In order to investigate X-1P's role to mechanical & tribological performances of HDI,the CSS experiment is also performed and the experiment results tell that the presence of X-1P dip-coated on the magnetic head can greatly reduce the friction between head and disk and improve CSS performance of HDI. In addition,the failure mechanism of HDI lube and X-1P's working principle as a HDI lube additive are analyzed and discussed respectively. The aluminum atom of alumina has empty orbits which can accept isolated electron pairs,and is a kind of Lewis acid with stronger electrophilic trend. Oxygen atom of PFPE has isolated electron pairs and shows nucleophilic trend. When the magnetic head contacts with the HDI lube,it is possible for alumina to induce PFPE to disproportionally degrade first from the ether bonding at enough high moment temperature. For X-1P,owing to its special molecule structure,not only has a good chemical stability but also shows stronger nucleophilic trend. When alumina contacts with the compounds of X-1P and PFPE,X-1P can be absorbed on the alumina surface prior to PFPE and keeps PFPE out of contact with alumina,and as such to protect PFPE out of degradation.