Dynamic magnetic information storage or retrieval – Head – Core
Patent
1989-03-23
1991-06-25
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Core
G11B 5147
Patent
active
050272462
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a magnetic head which can be used for perpendicular recording/reproducing purposes, or for reproducing data stored in an ordinary magnetic recording medium of the longitudinal type, and to a method for manufacturing such a magnetic head. More particularly, the invention pertains to a thin film magnetic head in which two thin films of first and second magnetic layers constitute a pair of magnetic poles, and a method for the manufacture of such a thin film magnetic head.
TECHNICAL TERMS
In this specification, a term "opposed surface area" is intended to mean a surface area of the magnetic head which is a limited area for allowing recording/reproducing of data onto and from a magnetic recording medium. That is, where the magnetic head is of the type that makes contact with the magnetic recording medium, the definition of "opposed surface area" is a surrounding, adjacent area of a first magnetic material layer on the magnetic head. Where the head is of the type that performs recording the reproducing without contact with the magnetic head, the "opposed surface area" is the area on the magnetic head which is held out of contact with the magnetic medium, but which is adjacent the medium at a distance sufficient for the recording/reproducing purpose. A term "head running direction" is intended to mean the direction in which the magnetic head travels relative to the magnetic recording medium in both cases where the magnetic head runs on the magnetic recording medium and where the latter runs on the former.
BACKGROUND ART
A conventional thin film magnetic head is formed, as shown in FIGS. 12 and 18, by laminating on a non-magnetic substrate 3 a second magnetic material layer 2, a gap material 8, coil conductor layers 4, and a first magnetic material layer 1 which constitutes a pair of magnetic poles with the second magnetic material layer 2 in this order. Usually, in this kind of thin film magnetic head, the first magnetic material layer 1, the gap material 8, the coil conductor layer 4, and the second magnetic material layer 2 are all provided in planes parallel to the surface of the non-magnetic substrate 3, and the head is disposed so that it runs on a magnetic recording medium (not shown) in a direction perpendicular to the above planes for recording and reproducing. Such a thin film magnetic head inevitably suffers from the generation of a waveform distortion or false pulse which is caused by the thicknesses of first and second magnetic material layers 1 and 2, as shown in a solitary reproduced waveform diagram of FIG. 14. The waveform distortion occurs when a false gap parallel to the recording and reproducing gap of the magnetic head is formed in its surface area opposed to the magnetic recording medium 10. In the thin film magnetic head, in particular, since the thicknesses of the pair of magnetic poles formed by the first and second magnetic material layers 1 and 2 are approximate to the wavelength for recording, the false pulse by the false gap distorts the signal waveform reproduced from the true gap, impairing the reproduced signal quality.
A method that has been proposed for reducing the waveform distortion is disclosed in Japanese Patent Laid-Open Gazette No. 205508/87, for example. According to this method, the thickness of the first magnetic material layer 1 is varied widthwise of the magnetic track on the recording medium so that the bottom 9 of the first magnetic material layer on the opposite side from the gap material 8 is inclined thereto, as shown in FIG. 15. The magnetic head of this structure is capable of suppressing the generation of the false signal by the false gap and hence lessening its influence but is incapable of completely removing the waveform distortion. Further, the manufacture of such a magnetic head involves many machining steps such as the formation of a groove having a bottom inclined by an angle .theta. in the non-magnetic substrate 3, sputtering of the first magnetic material layer 1 on the substrate S, and subsequent
Aruga Fusayoshi
Numazawa Junji
Heinz A. J.
Kabushiki Kaisha Sankyo Seiki Seisakusho
Nippon Hose Kyokai
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