Browse Prior Art Database

Magnetoresistive Head with a Recession of the Magnetoresistive Element

IP.com Disclosure Number: IPCOM000118590D
Original Publication Date: 1997-Apr-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Ikeda, Y: AUTHOR [+3]

Abstract

Disclosed is a Magnetoresistive (MR) head with a slight recession of the MR element from the Air-Bearing Surface (ABS) to decrease the frequency of the MR element's collisions with asperities on the magnetic disk surface.

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Magnetoresistive Head with a Recession of the Magnetoresistive Element

      Disclosed is a Magnetoresistive (MR) head with a slight
recession of the MR element from the Air-Bearing Surface (ABS) to
decrease the frequency of the MR element's collisions with asperities
on the magnetic disk surface.

      In recent magnetic disk drives, the flying height has been
reduced to 50 nm in order to realize high-linear-density recording.
Such a low flying height causes a problem of thermal asperity for the
MR head.  Mechanical collisions of the MR element with disk-surface
asperities cause a temperature increase.  This increases the MR
element resistance, which in turn causes a change in the MR signal
waveform.

      The disclosed method proposes a 10- to 20-nm recession for the
MR element surface from the ABS surface in the MR head, to decrease
the frequency of collisions of the MR element with asperities on the
disk-surface and suppress the temperature increase in the MR element
resulting from the collisions.  In the prior art, the surface of the
MR element, the shield layers, and the write pole are all in the same
plane as the ABS.

      The Figure shows an example of the proposed MR head
structure.  The MR element (1) is placed between the two shield
layers (2, 3) with a 10-20 nm recession (d) of the ABS surface.

This recession reduces the frequency of contact between the MR
element and the disk surface, and suppresses the temperature increase
in the MR ele...