JPH04245006A - Magnetic head for hard disk - Google Patents

Abstract

PURPOSE:To provide a metal in gap magnetic head for hard disk for enabling a track to be narrow without changing a floating characteristic. CONSTITUTION:Width dimensions of metal magnetic films 27 and 28 in confronted band shape regulate a track width W3 of a magnetic gap 24. Width dimensions of the band-shaped metal magnetic films 27 and 28 are determined before allowing a slider 21 to confront with a C core 22. A track width W3 of the magnetic gap 24 is determined regardless of width dimensions W2 of a top surface 23a of a center rail 23 and is narrower than the width dimensions W2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-in-gap magnetic head for hard disks having a metal magnetic film near the gap.

A so-called metal magnetic head having a metal magnetic film near the gap is used as a magnetic head having good recording and reproducing characteristics.
An in-gap (MIG) type magnetic head is known. The metal-in-gap type magnetic head described above is also used in magnetic heads for hard disks that perform recording and reproduction while floating above the hard disk.

[0003] In this magnetic head for a hard disk, it is necessary that the flying height from the hard disk is stable on the submicron order, and flying characteristics are important. Furthermore, as recording density increases, the track width of the gap tends to become narrower. Therefore, in magnetic heads for hard disks, it is desired to achieve narrower tracks without changing the flying characteristics.

0004

2. Description of the Related Art FIG. 13 shows an example of a conventional magnetic head 1 for a hard disk.

[0005] 2 is a slider, and 3 is a C core. 4 is a center rail, and there is a magnetic gap 5 in the middle of this rail.

When the magnetic gap 5 is enlarged, FIG.
As shown in 4. 6 is a gap material, and 7 and 8 are metal magnetic films such as Sendust (registered trademark).

The center rail 4 is formed by mechanical cutting and polishing in its longitudinal direction, and has a substantially trapezoidal cross-sectional shape.

[0008]

The track width W1 of the gap 5 is currently about 10 μm, and if this is to be made even narrower, the inclination angle α of the surfaces 9 and 10 with respect to the vertical plane must be set large during polishing.

However, if this is done, the width of the top surface 4a of the center rail 4 becomes narrower and the width of the top surface 4a of the center rail 4 becomes narrower.
The area of the earing surface decreases, and the flying characteristics of the magnetic head 1 change. As a result, the flying height of the magnetic head 1 relative to the hard disk changes.

An object of the present invention is to provide a magnetic head for a hard disk that solves the above problems.

[0011]

[Means for Solving the Problems] The present invention provides a slider and a C
In a hard disk magnetic head in which the cores are bonded, a magnetic gap is provided in the middle of the center rail, and a metal magnetic film is provided near the magnetic gap, at least the slider and the C core are bonded. A strip-shaped metal magnetic film formed on one side regulates the track width of the magnetic gap.

0012

[Operation] The structure in which the strip-shaped metal magnetic film regulates the track width of the magnetic gap makes it possible to determine the track width of the magnetic gap regardless of the width dimension of the top surface of the center rail.

[0013]

Embodiment FIG. 2 shows a magnetic head 20 for a hard disk according to a first embodiment of the present invention.

The hard disk magnetic head 20 has a structure in which a slider 21 and a C core 22 are joined. 2
3 is a center rail having the same width over its entire length, and 24 is a magnetic gap. As shown in FIG. 1, the center rail 23 has a rectangular cross section.

The top surface 23a of the center rail 23 has an area that generates a predetermined floating force, and has a width W2. The width dimension W2 is 10 μm or more.

The magnetic gap 24 has a magnetic gap portion 25
It consists of band-shaped metal magnetic films 27 and 28 such as Sendust (registered trademark), which face each other on both sides, and an adhesive 29.

The strip-shaped metal magnetic films 27 and 28 have a width W3 of several μm. W3 < W2.

Width dimension W3 of the strip-shaped metal magnetic films 27 and 28
The dimension W3 corresponding to is the track width.

Therefore, the hard disk magnetic head 20 has a predetermined ABS area that produces a desired flying force, and the track width W3 is larger than the center rail 23.
This configuration has a magnetic gap 24 narrower than the width W2 of the top surface 23a of the top surface 23a.

Next, a method of manufacturing the above magnetic head 20 will be explained. As shown in FIG. 3, the magnetic head 20 is manufactured through a metal magnetic film forming process 40, an etching process 41, a bonding process 42, and a mechanical cutting/polishing process 43.

First, in step 40, as shown in FIG. 4A, a metal magnetic film 51 is formed on the abutting surface 50a of the slider block 50 by sputtering or the like, and a metal magnetic film 51 is formed on the abutting surface 52a of the C core block 52. A metal magnetic film 53 is formed on the slider block 50.
Although the C core block 52 actually has a long size from which a plurality of magnetic heads 20 are cut out, in each figure, for convenience of illustration, it is shown as having a size corresponding to the width of one magnetic head 20. There is. The same applies to the following examples.

In the next step 41, the metal magnetic film 51
, 53 is subjected to wet, dry, laser assisted etching, etc., and a part of this is removed, as shown in FIG. 4(B).
As shown in , a strip-shaped metal magnetic film 2 having a width dimension of W3
In the next step 42 of leaving and forming the magnetic strips 7 and 28, as shown in FIG.
The C core block 52 is butted against the slider block 50 and bonded with adhesive to obtain a block assembly 54.

In the next mechanical cutting/polishing process 43,
cutting and polishing the block assembly 54 using a grindstone;
As shown in FIG. 2, both sides of the C core block 52 are removed, grooves 55 and 56 are formed in the slider block 50, and the center rail 23 and side rails 57 and 58 are formed.

The center rail 23 has a rectangular cross section and is formed with a width W2 so that the magnetic gap 24 is located at the center.

As described above, the hard disk magnetic head 20 shown in FIG. 1 is manufactured. Next, the features of the magnetic head 20 manufactured as described above will be explained.

■The track width W3 of the magnetic gap 24 and the width W2 of the center rail 23 are unrelated;
3a has a desired area, and the track width of the magnetic gap 24 can be made narrower than the width of the top surface 23a.

(2) The track width W3 of the magnetic gap 24 is determined by the accuracy of the etching process 41 and the accuracy of the bonding process 42.

The precision of steps 41 and 42 is high, and the track width W3 of the magnetic gap 24 is highly precise.

(2) The metal magnetic films 51 and 52 are not machined, the strip-shaped metal magnetic films 27 and 28 have good magnetic properties, and the magnetic head 20 has good magnetic properties.

(2) The strip-shaped metal magnetic films 27 and 28 extend perpendicularly to the head surface 59, as shown by broken lines in FIG. Therefore, when an information signal is recorded on the hard disk by the magnetic head 20, the magnetized track pattern on the hard disk has sharp edges.

■The width dimension W2 is 10 μm or more, and the center rail 23 is unlikely to be chipped during mechanical cutting or polishing.

■Since the track width W3 of the magnetic gap 24 is narrower than the width of the center rail 23, the center rail 2
Even if a chip occurs in the track width W3, the track width W3 will not be affected.

FIG. 5 shows a hard disk magnetic head 60 according to a second embodiment of the present invention, and FIG. 6 shows an enlarged view of the magnetic gap 61 in FIG.

In each figure, parts that substantially correspond to those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

Glass 62 and 63 are filled on both sides of the magnetic gap 61. This magnetic head 60 is
It is manufactured through manufacturing steps 70 to 73 shown in FIG.

In step 70, as shown in FIG. 8(A), metal magnetic films 51 and 53 are formed in the same manner as in FIG. 4(A).

Next, a track width regulating groove forming step 71 is performed. In this step 71, cutting is performed using a grindstone to form a pair of adjacent track width regulating grooves 80, 81 and 82, 83 as shown in FIG. 8(B).
, 81, and the strip-shaped metal magnetic film 27 is left between the grooves 82.
, 83, the strip-shaped metal magnetic film 28 is similarly left and formed.

In the next joining step 72, as shown in FIG.
As shown in FIG. 3, low melting point glass is filled in the recesses 84 and 85 formed by the abutted and opposing grooves and joined together to obtain a block assembly 86.

The next mechanical cutting/polishing step 73 is carried out in the same manner as step 43, and the magnetic head 60 shown in FIG. 5 is manufactured.

FIG. 9 shows a hard disk magnetic head 100 according to a third embodiment of the present invention, and FIG. 10 shows an enlarged view of the magnetic gap 101 in FIG.

In each figure, parts that substantially correspond to those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

Glass 102 and 103 are filled on both sides of the magnetic gap 101.

This magnetic head 100 is manufactured through manufacturing steps 110 to 114 shown in FIG.

This manufacturing process is a combination of the first and second embodiments. In step 110, as shown in FIG. 12(A), metal magnetic films 51 and 53 are formed similarly to FIG. 4(A).

In the next step 111, as shown in FIG.
As shown in FIG. 4B, band-shaped metal magnetic films 27 and 28 are left by etching, as in FIG. 4B.

In the next step 112, as shown in FIG.
As shown in FIG. 2, glass filling grooves 120 to 123 are formed slightly outside the metal magnetic films 27 and 28.

In the next step 113, FIG. 12(C)
As shown in FIG.
A block assembly 126 is obtained.

The next step 114 is performed in the same manner as step 43, and the magnetic head 100 shown in FIG. 9 is manufactured.

The magnetic head 20 of the first and third embodiments,
Since the track width is defined by etching, No. 100 is suitable for a track width as narrow as 10 μm to several μm.

Furthermore, in each of the above embodiments, the strip-shaped metal magnetic films 27 and 28 are formed on both the slider block 50 and the C core block 52. It may be formed only on one of the C core portions 52.

[0051]

[Effects of the Invention] As explained above, according to the magnetic head for a hard disk according to the present invention, the track width of the magnetic gap can be narrowed without changing the area of the top surface of the center rail that determines the flying characteristics. It has the advantage of being suitable for narrower tracks in the future.

[Brief explanation of the drawing]

1 is an enlarged view showing a magnetic gap portion of a magnetic head for a hard disk according to a first embodiment of the present invention shown in FIG. 2;

FIG. 2 is a perspective view of a magnetic head for a hard disk according to a first embodiment of the present invention.

3 is a diagram showing a manufacturing process of the magnetic head for a hard disk shown in FIG. 2. FIG.

FIG. 4 is a diagram illustrating each step in FIG. 3;

FIG. 5 is a perspective view of a magnetic head for a hard disk according to a second embodiment of the present invention.

FIG. 6 is an enlarged view of the vicinity of the magnetic gap in FIG. 5;

7 is a diagram showing a manufacturing process of the magnetic head for a hard disk shown in FIG. 5. FIG.

8 is a diagram illustrating each step in FIG. 7. FIG.

FIG. 9 is a perspective view of a magnetic head for a hard disk according to a third embodiment of the present invention.

10 is an enlarged view showing the vicinity of the magnetic gap in FIG. 9; FIG.

11 is a diagram showing a manufacturing process of the hard disk magnetic head shown in FIG. 9. FIG.

FIG. 12 is a diagram showing each step in FIG. 11.

FIG. 13 is a diagram showing an example of a conventional magnetic head for a hard disk.

FIG. 14 is an enlarged view of the vicinity of the magnetic gap in FIG. 13;

[Explanation of symbols]

20,60,100 Hard disk magnetic head 2
1 Slider 22 C core 23 Center rail 23a Top surface 24, 61, 101 Magnetic gap 25 Magnetic gap portion 27, 28 Band-shaped metal magnetic film 29 Adhesive 40, 70, 110 Metal magnetic film forming step 41, 11
1 Etching process 42, 72, 113 Bonding process 43, 73, 114 Mechanical cutting/polishing process 50 Slider block 50a Abutting surfaces 51, 53 Metal magnetic film 52 C core block 52a Abutting surfaces 54, 86, 126 Block assembly 55, 56
Grooves 57, 58 Side rail 59 Head surface 62, 63, 102, 103 Glass 80 to 83
Track width regulating grooves 84, 85, 124, 125 Recessed portion 112 Glass filling groove forming steps 120 to 123 Glass filling groove

Claims (1)

[Claims] 1. A magnetic head for a hard disk comprising a slider and a C core bonded together, a magnetic gap in the middle of a center rail, and a metal magnetic film near the magnetic gap, in which the magnetic head is provided with a metal magnetic film in the vicinity of the magnetic gap. A magnetic head for a hard disk, characterized in that a strip-shaped metal magnetic film formed in a strip shape on at least one of the slider and the C core regulates the track width of the magnetic gap.