Reduction of field through read element using shorter read shield

Values for field through the read element ( H read ) in longitudinal and perpendicular magnetic recording are compared with the aid of three-dimensional (3d) finite element models. We show that the H read of the single-pole-type head used in perpendicular magnetic recording (PMR) was larger than tha...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10N504-10N504-3
Main Authors: Mochizuki, Masafumi, Suzuki, Kaori, Ishikawa, Chiaki, Etoh, Kimitoshi, Katada, Hiroyuki, Nishida, Yasutaka, Okada, Tomohiro
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Values for field through the read element ( H read ) in longitudinal and perpendicular magnetic recording are compared with the aid of three-dimensional (3d) finite element models. We show that the H read of the single-pole-type head used in perpendicular magnetic recording (PMR) was larger than that of the inductive ring head used in longitudinal magnetic recording (LMR). This is because that the medium for a PMR system includes a soft under layer (SUL). The H read of PMR is affected by the permeability and thickness of SUL. The characteristic length of the upper and lower shield layers at which the H read starts to decrease is found to be roughly equal to the length of the return pole. Decreasing the length of the upper and lower shield is shown to be the most practicable and effective way to realize the reduction of H read .
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1849058