FEM Model Analysis of Single-Pole-Type Heads with Different Coil Structures

Kiyoshi YAMAKAWA  Shingo TAKAHASHI  Kazuhiro OUCHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.8   pp.1555-1560
Publication Date: 2007/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.8.1555
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress of High-Density Information Storage)
Category: 
Keyword: 
perpendicular recording,  pole-tip-driven-type head,  coil recession,  cusp coil,  helical coil,  

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Summary: 
Pole-tip-driven structure, which is composed of a coil wounded at the main pole tip, is favorable for obtaining a sharp and strong head field as a single-pole-type head. Three kinds of pole-tip-driven-type heads with different yoke and coil structures are investigated in terms of magnetomotive force dependence of head field and effect of coil recession. Field calculation by finite-element method (FEM) showed that the three heads exhibited the same field sensitivity in spite of the difference in distribution of coil exciting field and magnetization of the main pole. In a lower range of magnetomotive force the heads showed different dependence of field sensitivity on the coil recession. However, there was not much difference in degradation of sensitivity in a region near the saturation of field. Thus, the importance of reducing coil recession was confirmed as reported earlier.