Browse Prior Art Database

Recording Head Slider Flown by Superconductive Levitation

IP.com Disclosure Number: IPCOM000109234D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 53K

Publishing Venue

IBM

Related People

Zappe, HH: AUTHOR

Abstract

The invention disclosed is a recording head slider flown by superconductive levitation over a magnetic recording disk comprising a superconductor with a magnetic coating.

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This is the abbreviated version, containing approximately 69% of the total text.

Recording Head Slider Flown by Superconductive Levitation

       The invention disclosed is a recording head slider flown
by superconductive levitation over a magnetic recording disk
comprising a superconductor with a magnetic coating.

      The slider structure consists of at least three levitation
coils which are attached as feet.  Alternatively, the coils may be
attached to an arm positioned radially above the slider.  Current fed
into the coils produces a magnetic field with a magnitude great
enough to lift the slider above the superconductor, and hence the
disk.  This result is achieved by taking advantage of the diamagnetic
properties of superconductors.

      The slider levitation height can be adjusted dynamically by
independently adjusting the coil current.  Wings or other aerodynamic
structures may be needed to stabilize the slider in the air flow
produced by the rotating disk.

      A superconductor may be attached to the slider for the purpose
of positioning.  In a magnetic field, the slider will tend to move in
a direction that minimizes its positional energy.  The location of
this field minimum can be controlled by adjusting the current in the
actuator coils.  The slider will follow the change and readjust its
position.

      Fine positioning of the slider can be achieved by etching the
superconductor on the disk into fine lines adjacent to the tracks.
The recording medium is then placed either between or on the top
surface of t...