权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

RESEARCH ON PERPENDICULAR SINGLE-POLE-TYPE HEAD FOR ULTRA HIGH DENSITY MAGNETIC RECORDING BY USING NUMERICAL ANALYSIS

垂直单极型超高密度磁记录磁头的数值分析研究

基本信息

批准号：
15560311
负责人：
KANAI Yasushi
金额：
$ 2.3万
依托单位：
NIIGATA INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

In this scientific research, single-pole-type head, one of the most important components in perpendicular recording, was investigated by numerical analysis. The original goal was set at 1 Terabits per square inch (Terabits/in^2). We have investigated the SPT head structure to achieve this density and beyond. Here are the results obtained :1.A single-pole-type head design for 400 Gb/in^2 based on FEM simulations was investigated. The conditions required to generate a sufficient field for this areal density were shown. To reach this density various media were considered and written track widths, erase bands, SNR's, and written bit patterns were derived from LLG simulations.2.The recording performance of discrete track media and continuous media was compared. Trailing shields increase the head field gradient, leading sharper transitions and higher SNR. The optimum trailing shield gap was determined to be 30 nm for both types of media. Using such a write head and subject to the condition of no adjacent track erasure the discrete track media SNR was 1.5 dB higher than the continuous media at a linear density of 1700 kfci.3.LLG calculation that treats the whole magnetic material micromagnetically was performed. The recording fields are investigated for various pole tip structures. It was found that an optimum non-zero throat height exists that maximizes recording field strength. Trailing shield was found to be effective with regard to obtaining a larger recording field gradient.4.Thermal analysis was carried out and the temperature rise in the SPT head element derived for various conditions. Deformation analysis due to temperature rise was not investigated because of commercial software bugs.

本文对垂直记录中最重要的部件之一单极式磁头进行了数值分析。最初的目标是每平方英寸1太比特(Terabits/in^2)。我们已经研究了SPT磁头结构，以实现这一密度和更高的密度。研究结果如下：1.基于有限元模拟，研究了400 GB/in2单极式磁头的设计。给出了产生足够的面密度场所需的条件。为了达到该密度，考虑了各种介质，并从LLG模拟得出了写入磁道宽度、擦除带、SNR和写入比特模式。2.比较了离散磁道介质和连续介质的记录性能。尾部屏蔽增加了头部磁场的梯度，导致了更尖锐的过渡和更高的SNR。两种介质的最佳拖尾屏蔽层间距均为30 nm。使用这样的写头，在没有相邻磁道擦除的情况下，在1700kfci线密度下，离散磁道介质的SNR比连续介质高1.5db。3.进行了微磁处理整个磁性材料的LLG计算。研究了不同极尖结构的记录场。发现存在最大化记录场强的最佳非零喉部高度。发现拖尾屏蔽对于获得更大的记录场梯度是有效的。4.进行了热分析，得出了不同条件下SPT磁头元件的温升。由于商业软件错误，未对温度升高引起的变形分析进行调查。