Thin film magnetic head and magnetic disk apparatus using the same

Abstract

A thin film magnetic head which can suppress magnetic saturation at opposite ends of width of a narrow track width to reduce the amount of recording side-fringing onto a recording medium and which can assure a necessary recording magnetic field satisfactorily. Also a magnetic disk apparatus using the head. A second magnetic yoke has a magnetic gap depth over which the spacing of a magnetic gap keeps substantially equal toward a rear portion of the second magnetic yoke, starting at the tip of a second magnetic pole and the spacing between a first magnetic yoke and the second magnetic yoke is increased toward the rear portion, starting at a position corresponding to the magnetic gap depth. The second magnetic pole of the second magnetic yoke has in the track width direction a width for recording a signal on a track width of the recording medium. The width keeps constant over a predetermined length toward the rear portion, starting at the second magnetic pole tip and spreads monotonically toward the rear, starting at a position corresponding to the predetermined length. The predetermined length terminating in the spread start position of the width of the second magnetic yoke is set to be shorter than the magnetic gap depth.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to a narrow track thin film magnetic head and a magnetic disk apparatus carrying the thin film magnetic head and more particularly to the structure of a recording head of the thin film magnetic head.The thin film magnetic head carried on a high recording density magnetic disk apparatus has been used widely and many proposals to improve the performance have been made. Recently, there is an increasing demand for improvement in the performance directed to high density recording and today, a composite apparatus in which the conventional inductive type recording head and the reproduction head such as highly sensitive MR head are separately incorporated tends to be used generally. The performance of recording and reproduction has been improved remarkably by the aforementioned composite apparatus having the separated heads as well known in the art but from the standpoint of further promotion of improvement in the performance, only th...

AI Technical Summary

Benefits of technology

The present invention relates to a thin film magnetic head for recording on a narrow track width in a magnetic disk apparatus. The technical problem addressed is the decrease in recording magnetic field and magnetic saturation at the opposite ends of the track width, which causes side-fringing and limits the recording density. The invention provides a solution to suppress the decrease in recording magnetic field and magnetic saturation at the opposite ends of the track width, while ensuring a necessary recording magnetic field and reducing the amount of side-fringing onto the recording medium.

Problems solved by technology

The expedient is, however, accompanied by problems that a recording magnetic field from the tip of a magnetic gap decreases and magnetic flux is concentrated to opposite ends of track width, leading to magnetic saturation at the opposite ends.

However, the above prior art does not take into consideration problems raised in narrowing the track, failing to refer to magnetic saturation at opposite ends of track width and problems encountered in connection with magnetic saturation at the magnetic pole tip.

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