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US 4,979,064 AGranted
Magnetic recording/playback head comprising a superconducting material
AssigneeThomson-CSF
InventorsJean-Claude Mage, Jean-Luc Rolland, Jean-Paul Castera
Life of this patent
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Abstract
In a magnetic head, there is provided, in the gap, a superconducting material that has zero permeability and prevents the passage of the magnetic field in the gap. Various alternative embodiments are used to improve the efficiency of the head by channelling the magnetic flux outside the gap.
Claims5
A recording/playback magnetic head comprising:
- a magnetic circuit formed from two magnetic poles separated by a gap,
- wherein the set of magnetic poles and the gap are arranged near a recording surface of a magnetic recording medium,
- further wherein the gap contains at least one layer of superconducting material arranged in a direction substantially perpendicular to the recording surface of the recording medium;
- and
- wherein said magnetic circuit comprises a magnetic field induction circuit formed as a thin film of the same superconducting material that is contained within said gap.
2 more elements
A magnetic recording/playback head comprising:
- a magnetic driving circuit;
- a single pole provided with a magnetic field induction coil and having a magnetic field emission end comprising an emission face placed near a recording surface of a magnetic recording medium so as to emit a magnetic field perpendicular to the recording surface, comprising at least one sheath made of a superconducting material covering the emission end except for the emission face;
- and
- wherein said sheath of superconducting material covers the magnetic driving circuit mean and said magnetic field induction coil except for the emission face.
1 more element
Dependencies are inferred from the claim text.