Pulse shape, resolution, and signal-to-noise ratio in perpendicular recording

被引：34
|
作者：
Valcu, B [1 ]
Roscamp, T
Bertram, HN
机构：
[1] Univ Calif San Diego, Ctr Magnet Recording Res, La Jolla, CA 92093 USA
[2] Seagate Technol, Pittsburgh, PA 15203 USA
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2002年 / 38卷 / 01期
关键词：
magnetic scalar potential; perpendicular recording; resolution; single pulsewidth; SNR;
D O I：
10.1109/20.990120
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The paper theoretically examines playback characteristics of a giant magnetoresistive (GMR) head for perpendicular recorded magnetization transitions with a soft underlayer. The magnetic scalar potential, calculated numerically by the finite-element method, is fitted to a simple formula involving geometry-dependent parameters. The reciprocity principle leads to the shape of the single pulse signal. For high permeability of the underlayer the pulse has an error function-type dependence on distance. Within this approximation, the paper derives simple formulas for the pulsewidth T-50, D-50, and transition-noise-limited signal-to-noise ratio.
引用
收藏
页码：288 / 294
页数：7
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