Magnetic recording medium and method of recording
AssigneeSharp Kabushiki Kaisha
InventorHiroyuki Katayama
Life of this patent
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Abstract
In a method of recording and reproduction using a magnetic storage medium, a magnetic storage medium (5) is used in which at least magnetic recording film (2) and a superconducting film (3) are deposited. According to the method, the superconducting layer (3) is partly heated where data is either recorded in recording or reproduced in reproduction, using a semiconductor laser (6) to or beyond its critical temperature at which diamagnetism disappears. Thus, in recording, data can be recorded with high density without affecting adjacent parts of the magnetic recording layer regardless of the physical size of the magnetic head. In reproduction, data can be reproduced from a minuscule part at high S/N ratios with crosstalk from adjacent bits being substantially eliminated.
Claims9
A magnetic storage medium, comprising:
- a magnetic recording layer;
- a superconducting layer;
- and
- a non-magnetic thermal insulation layer, provided between the superconducting layer and the magnetic recording layer, for reducing heat transmitted from the superconducting layer to the magnetic recording layer.
A method of recording and reproducing using a magnetic storage medium in which at least a magnetic recording layer, a superconducting layer and a thermal insulation layer provided between the superconducting layer and the magnetic recording layer are deposited, wherein:
- data is recorded in the magnetic recording layer by passing a signal magnetic field produced by a recording-use magnetic head through a part of the superconducting layer where the data is to be recorded and diamagnetism disappears;
- and
- data is reproduced from the magnetic recording layer by detecting, using a reproduction-use magnetic head, a magnetic flux leakage from the magnetic recording layer through a part of the superconducting layer where the data is to be reproduced and diamagnetism disappears.
Dependencies are inferred from the claim text.