Browse Prior Art Database

Thermally-Assisted Magnetic Recording

IP.com Disclosure Number: IPCOM000118985D
Original Publication Date: 1997-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Rosen, HJ: AUTHOR [+2]

Abstract

This disclosure deals with the general notion of magnetic recording in which the write process takes place by the simultaneous juxtaposition of a write field and a thermal pulse, and where the desired spatial resolution is provided by the sharp localization of the field from the write head. This is to distinguish it from magnetically-assisted optical storage, in which a diffuse magnetic field is applied during optical writing to establish the polarity of the written spot. This latter is sometimes referred to as optically-assisted magnetic recording, but the spatial resolution in those schemes is always provided by the optical spot size rather than by the magnetic field.

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Thermally-Assisted Magnetic Recording

      This disclosure deals with the general notion of magnetic
recording in which the write process takes place by the simultaneous
juxtaposition of a write field and a thermal pulse, and where the
desired spatial resolution is provided by the sharp localization of
the field from the write head.  This is to distinguish it from
magnetically-assisted optical storage, in which a diffuse magnetic
field is applied during optical writing to establish the polarity of
the written spot.  This latter is sometimes referred to as
optically-assisted magnetic recording, but the spatial resolution in
those schemes is always provided by the optical spot size rather than
by the magnetic field.  Thus, the key to high areal density in those
schemes is in the optical resolution of the head, and the magnetic
field generator is rather crude by magnetic recording standards.

      One instance of Thermally-Assisted Magnetic Recording (TAMR)
known in the patent literature is seen in [*].  In this patent, a
very specific embodiment is proposed.  A thermal pulse provided by an
optical spot or a local heater on the write head is used to select
which one of two thin film media layers is written by the head.  One
layer can be written by the head at lower temperature, and the other
at higher temperatures.  The more general form of TAMR is not claimed
in this patent, but it can be recognized.  In particular, it is
obvious from the teaching of this pa...