Browse Prior Art Database

Doubling of Recording Fields by the Use of Superconductors

IP.com Disclosure Number: IPCOM000109232D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

Zappe, HH: AUTHOR

Abstract

The invention disclosed is a magnetic recording disk comprising a superconductor with a magnetic coating which takes advantage of the diamagnetic properties of superconductors to double the disk's magnetic field.

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Doubling of Recording Fields by the Use of Superconductors

       The invention disclosed is a magnetic recording disk
comprising a superconductor with a magnetic coating which takes
advantage of the diamagnetic properties of superconductors to double
the disk's magnetic field.

      When an inductive head is flown over the surface of the disk,
the superconductor buried beneath the surface will reflect the
magnetic field generated by the inductive head.  The superconductor
produces an image of the head which in turn produces magnetic fields.
These fields are added to those those produced by the head.

      Furthermore, the flux emanating from written transitions on the
disk also doubles, since the high flux permeability of the
superconductor reflects the field lines.  These field lines would
normally close through the inside of the disk.