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AssigneesTDK Corporation, SAE Magnetics (H.K.) Ltd.
InventorsNaoto Matono, Shigeru Shoji, Ken-Ichi Takano
Estimating the term…
Provided is a thin film magnetic head capable of reducing expansion and bending of a recording pattern resulting from a skew so as to improve recording performance. A main pole layer comprises a laminate including a bottom main pole layer being disposed on a medium-incoming side and having a first saturated magnetic flux density and a top main pole layer being disposed on a medium-outgoing side and having a second saturated magnetic flux density larger than the first saturated magnetic flux density. When magnetic flux flows in the main pole layer, magnetic flux saturation occurs in the bottom main pole layer with a smaller saturated magnetic flux density, however, no magnetic flux saturation occurs in the top main pole layer with a larger saturated magnetic flux density, so the magnetic flux flows mainly in the top main pole layer on a priority basis. Writing by the main pole layer is mainly performed by the top main pole layer on the medium-outgoing side, so compared with the case where the main pole layer has a large saturated magnetic flux density as a whole, expansion of the recording pattern resulting from the skew can be reduced.
A thin film magnetic head used for a magnetic recording apparatus comprising a recording medium moving to a predetermined direction of medium movement, the thin film magnetic head comprising:
A method of manufacturing a thin film magnetic head, the thin film magnetic head being used for a magnetic recording apparatus comprising a recording medium moving to a predetermined direction of medium movement, and the thin film magnetic head comprising a thin film magnetic coil generating magnetic flux and a pole layer emitting the magnetic flux generated in the thin film coil to the recording medium,
A magnetic recording apparatus, comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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Details: shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect,…
Including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or…:…
Recording by magnetisation or demagnetisation of a record carrier
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: recording on, or…
Term end not estimated
1. Field of the Invention
The present invention relates to a thin film magnetic head comprising at least an inductive magnetic transducer for recording, a method of manufacturing the same, and a magnetic recording apparatus such as, for example, a hard disk drive which comprises the thin film magnetic head.
2. Description of the Related Art
FIGS. 1A and 1B are sectional views of a thin film magnetic head according to a first embodiment of the invention;
FIG. 2 is an enlarged perspective view of a main part of the thin film magnetic head shown in FIGS. 1A and 1B;
FIG. 3 is an enlarged plan view of the main part of the thin film magnetic head shown in FIGS. 1A and 1B;
Preferred embodiments of the present invention will be described in more detail below referring to the accompanying drawings.
[First Embodiment]
At first, referring to FIGS. 1A through 3, a structure of a thin film magnetic head according to a first embodiment of the invention will be described below. FIGS. 1A and 1B show sectional views of the thin film magnetic head, and FIG. 1A shows a sectional view parallel to an air bearing surface, and FIG. 1B shows a sectional view perpendicular to the air bearing surface. FIGS. 2 and 3 show an enlarged perspective view and an enlarged plan view of a main part of the thin film magnetic head shown in FIGS. 1A and 1B, respectively. An up arrow B in FIGS. 1A and 1B indicates a direction in which a recording medium (not shown) moves relative to the thin film magnetic head, that is, a direction of movement of the recording medium (direction of medium movement).