JPH01159816A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce a crosstalk from adjoining tracks by executing a lamination up to an upper magnetic substance, and thereafter, lowering the permeability of magnetic substance track direction both edges except for an aimed track width by means of an ion implantation, etc. CONSTITUTION:On a non-magnetic substrate 7 such as a ceramic, a lower mag netic substance 2 such as a 'Permalloy(R)', an insulating layer 6, a coil conduc tor 5, the insulating layer 6 and an upper magnetic substance 1 such as the 'Permalloy(R)' are successively laminated. After the upper magnetic substance 1 is formed, the permeability of both edge parts 3 and 3' of the lower magnetic substance 2 is made 1/10 or below by the ion implantation. Thus, the effective track widths at the tie of recording and reproducing can be made to coincide, and the influence on the crosstalk from the adjoining tracks can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head for a magnetic recording device, and particularly to a thin film magnetic head suitable for increasing track density.

[Conventional technology]

In the conventional inductive thin film head as described in Japanese Patent Application Laid-Open No. 55-87323, as shown in FIG. A manufacturing method that makes the diameter narrower than that of magnetic materials is generally used.

[Problem that the invention seeks to solve]

In the conventional magnetic head described above, the recording track width is the width of the narrower upper magnetic pole. On the other hand, during reproduction, the difference in the length of the upper and lower magnetic poles acts as an antenna for adjacent tracks in terms of a magnetic circuit. Therefore, when increasing the track density, if the difference in the length of the bottom magnetic pole becomes large compared to the track width, the influence of crosstalk from the adjacent rack becomes significant, which becomes a major factor in reducing the S/N. An object of the present invention is to effectively reduce the difference in length between the upper and lower magnetic poles, thereby solving the above problem and achieving high track density.

[Means for solving problems]

The above purpose is to stack layers up to the upper magnetic material using the conventional method.
This is achieved by reducing the magnetic permeability at both ends of the magnetic material in the track direction other than the desired track width by ion implantation or the like.

[Effect]

With the above configuration, the track widths of the upper and lower magnetic bodies during reproduction are the same. On the other hand, the track width during recording is the magnetic pole width in the narrower track direction of the upper and lower magnetic bodies.

Therefore, in a head with the conventional structure shown in Fig. 3, if the magnetic permeability of both end portions of the magnetic pole other than the portion where the lower magnetic material overlaps with the upper magnetic material is made low, it is possible to match the effective track widths during recording and reproduction. This makes it possible to reduce the influence of crosstalk from adjacent tracks, which is a major factor in reducing S/N when achieving high track density with a conventionally structured head. Furthermore, wide-Write, Narrow-Rea, which is another method of achieving high track density with a single blade,
d) It is also possible to realize a head using the present invention. As a method, first, when forming the upper and lower magnetic bodies, the track width at the time of recording is formed.Then, both ends of the magnetic poles in the track direction of the upper and lower magnetic bodies are made to have low magnetic permeability, so that the track width at the time of reproduction is set at the time of recording. Make it narrower than the track width.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Since the head structure is the same as the conventional head shown in FIG. 3, conventional thin film head processing techniques can be applied. In other words, on the non-magnetic substrate 7 such as ceramic,
Using thin film forming process technology, the lower magnetic body 2gA is made of high magnetic permeability, high saturation magnetic flux material such as permalloy.
6. Insulating layer made of a material with good wear resistance such as Q z Oa @ 5lOz. Coil conductor 5 made of a good conductor such as copper = Insulating layer 6 such as AQzOsrSing. An upper magnetic material 6 such as permalloy is sequentially laminated. When the core width of the lower magnetic body 2 in the track direction is formed larger than that of the upper magnetic body 1 as in the conventional case, after forming the upper magnetic body 1, both ends of the lower magnetic body 2 are formed by ion implantation as shown in FIG. The magnetic permeability of portions 3 and 3' is set to 1710 or less. By the above method, the effective track width during reproduction can be made to match the core width of the upper magnetic body in the track direction.

Further, a second embodiment of the present invention will be explained with reference to FIG.

In this embodiment, the core width in the track direction when forming the upper and lower magnetic bodies is targeted at the track width during recording. Next, by ion implantation similar to that in the first embodiment, the magnetic permeability of both ends of the upper and lower magnetic bodies in the track direction was reduced to 1/1 as shown in FIG.
Set it to 0 or less.

As a result, the effective track width during recording is W2. , the effective track width during playback is W 1 (W z > W 1 ), and Wide-Write, Narrow-Read
can be realized with a single head.

〔Effect of the invention〕

According to the present invention, it is possible to reduce crosstalk from adjacent tracks due to alignment errors when stacking the upper and lower magnetic bodies, making it easy to achieve high track density. In still other embodiments, Wide-Write, Narr
OW-Read head can be easily formed.

In this case as well, it is effective in increasing track density.

[Brief explanation of the drawing]

1 and 2 are plan views showing the magnetic pole shape of the medium facing surface of a thin film head according to an embodiment of the present invention, and FIG. 3 is a sectional view of a conventional thin film head and a plan view showing the magnetic pole shape of the medium facing surface. FIG.

Claims (1)

[Claims] 1. In an inductive thin film magnetic head having a structure in which a lower magnetic pole, an insulating layer, a conductive coil, an insulating layer, and an upper magnetic pole are sequentially laminated, after the thin film is formed, the lower magnetic pole or,
A magnetic head characterized in that an end portion of the upper magnetic pole in the track width direction has low magnetic permeability. 2. The track width of the lower magnetic pole is made wider than the track width of the upper magnetic pole, and the end of the core of the lower magnetic pole other than the part that overlaps with the track width of the upper magnetic pole has low magnetic permeability. 2. The magnetic head according to claim 1, characterized in that: 3. In claim 1, the track width of the upper and lower magnetic poles is formed as a recording track width, and the ends of the cores of both magnetic poles in the track width direction are made to have low magnetic permeability to achieve an effective 2. The magnetic head according to claim 1, wherein the reproduction track width is narrower than the recording track width.