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High Density Recording Method using Film

IP.com Disclosure Number: IPCOM000110492D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 3 page(s) / 90K

Publishing Venue

IBM

Related People

Hoyt, RF: AUTHOR [+3]

Abstract

Disclosed is a method of writing very small bit patterns. This method is proposed by using the edge of a flux closure laminated film as a write head and double-layered perpendicular media (see Fig. 1).

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High Density Recording Method using Film

       Disclosed is a method of writing very small bit patterns.
This method is proposed by using the edge of a flux closure laminated
film as a write head and double-layered perpendicular media (see Fig.
1).

      This method uses the following items:
1) Single pole head

      The film of the head must be laminated [*] or has the flux
closure structure in order to make the film single domain.  The edge
must be sharp.  If the edge of the prepared film is not sharp enough,
it must be reshaped by ion milling, etc.  The film should be placed
in tilted angle to the medium so that the side fringe fields from the
film are minimized.
2) Media

      The media are double-layered or single-layered perpendicular
media.  The coercivity of the media must be uniform over the entire
surface of the recording media, and relatively high squareness is
preferred.
Simulation Result (see Fig. 2)

      Simulation has been done to study the shape of the field under
the assumption that the distance between the edge of film and
high-permeable underlayer is 0.2 microns and the end of the single
pole head is connected to the underlayer with a high-permeable
0.1-micron thick wire.  This structure of the magnetic flux return
path is for simulation purpose only.  It is also assumed that the
angles theta 1 and 2 are 90 degrees and 45 degrees, respectively.
The value of the field at 0.02 microns from the film edge is computed
by the bo...