Browse Prior Art Database

Placement of Read/Write Element at Crown Fly Height Variation Node

IP.com Disclosure Number: IPCOM000116060D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Chikazawa, T: AUTHOR [+4]

Abstract

The disclosed concept is to exploit Crown-Perturbed Fly Height Variation node (CFVN), which is also disclosed here, in designing air-bearing-supported magnetic head used in Hard Disk Drives (HDD).

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Placement of Read/Write Element at Crown Fly Height Variation Node

      The disclosed concept is to exploit Crown-Perturbed Fly Height
Variation node (CFVN), which is also disclosed here, in designing
air-bearing-supported magnetic head used in Hard Disk Drives (HDD).

      In designing Air Bearing Surface (ABS) for Head Suspension
Assembly (HSA) used for HDD, effort is spent to minimize tolerance of
Gap Fly Height (GFH).  The biggest contributor to the the tolerance
is crown variation of the slider (36%).  The crown variation comes
from both slider process and HSA process, predominantly from slider
process, which is difficult to reduce.

      Fig. 1 shows design simulation of flying profiles with varied
crown value over spec range.  The crown values used are: -25.5, 0,
20, 40, and 65.5nms.  As an arrow points in the Figure, there are two
"nodes" where fly height does not change against the varied crown.
Especially, the one near the trailing end of the slider, 200um away
from trailing edge, can be a perfect location to place magnetic
read/write elements.  This point is the CFVN mentioned above.  Fig. 2
shows the proposed scheme: to locate read/write magnetic element at
the CFVN.

      Another merit of the scheme is that often hated roll-off at the
end of the slider can be circumvented from affecting the gap-FH by
adopting the placement of the gap-FH at CFVN.  Demerit of the
increase in gap fly height is insignificant when low cost production
is mo...