JPH05242414A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To provide a composite magnetic head having a magnetic head core of which the core efficiency is enhanced and accuracy of a gap depth is improved and whose CSS characteristics are superior. CONSTITUTION:The magnetic head core 1 composed by laminating a nonmagnetic ceramic body 15 and a magnetic path forming member 16 in the thickness direction is connected to the flank of a nonmagnetic slider 2 floating opposing to the magnetic disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head used in a hard disk drive device.

[0002]

2. Description of the Related Art With the increase in capacity of magnetic disks, which are recording media of hard disk drive devices in recent years, the width of the recording / reproducing track band has been narrowed and the recording linear density has been improved. In a magnetic head for dealing with such a magnetic disk, if the track is made narrower and the recording density is made higher, the head output and the resolution are lowered.

For this reason, the present inventor has previously proposed, as a composite magnetic head having a magnetic head core having a novel structure capable of maximizing the magnetic permeability μ, as shown in FIG. The magnetic head core 53 is arranged in the core slit 52 of the non-magnetic slider 51, and the magnetic head core 53 has a non-magnetic ceramic body 55, a magnetic path forming member 54, and a non-magnetic material in the thickness direction. A composite magnetic head formed by stacking ceramic bodies 55,
That is, a composite magnetic head using a laminated magnetic head core has been proposed (Japanese Patent Application No. 3-315666).

According to the composite magnetic head core 53 described above, the magnetic permeability μ can be maximized, for example, 10 μ.
The effect is that the track width of about m can be easily controlled.

[0005]

2. Description of the Related Art In the above-described method of manufacturing the composite magnetic head 50, a flying rail 56 extending in the longitudinal direction is provided on the surface facing the magnetic disk, and a core slit is provided on the air outflow end side of the flying rail 56. The slider 51 having 52 is formed, the laminated magnetic head core 53 is formed in a separate step, and then the laminated magnetic head core 53 is glass-bonded and fixed to the core slit 52 of the slider 51. The surface was manufactured by mirror-finishing the surface and driving the gap depth of the laminated magnetic head core 53 to a predetermined value.

In particular, since the magnetic head core 53 is surrounded on three sides by the core slit 52, the bonding glass 57 between the magnetic head core 53 and the core slit 52 is used for the measurement for driving the gap depth to a predetermined value. Since the fixed portion must be measured obliquely, there is a problem that the measurement accuracy of the gap depth is reduced.

When the magnetic head core 53 is fixed to the core slit 51 with the bonding glass 57, the bonding glass 5 is used.
Since 7 is contracted and fixed, the bonded glass 57 after fixation has an internal stress that tends to expand and maintains an equilibrium state. However, due to the mirror finishing of the surface of the levitation rail 56, the equilibrium state of the levitation rail 56 is broken, and the portion to which the magnetic head core 53 is fixed is not polished after polishing.
There will be jumps (ski jumps),
A problem is the CSS characteristic of damaging the surface of the magnetic disk.

The present invention has been devised in view of the above-mentioned problems, and it is easy to control the gap depth and CS
A composite magnetic head having excellent S characteristics is provided.

[0009]

According to the present invention, a magnetic head core formed by laminating a non-magnetic ceramic body and a magnetic path forming member is joined to a side surface of a non-magnetic slider which is opposed to a magnetic disk and floats. It is a characteristic composite type magnetic head.

Further preferably, the magnetic path forming member is
It is composed of a stack of a plurality of metal magnetic films. Further, the magnetic path forming member is formed wider than the width of the recording / reproducing track band formed on the magnetic disk, and the width of the magnetic path forming member exposed on the surface facing the magnetic disk is substantially the same as the recording track band. Is the same.

[0011]

With the above structure, since the magnetic head core is bonded to the side surface of the non-magnetic slider, the gap depth of the magnetic head core can be directly measured, so that the measurement accuracy is dramatically improved and the desired characteristics can be easily achieved. Will be obtained.

Further, since the flying rail is not formed with the core slit for mounting the magnetic head core, there is no ski jump as in the conventional case, and the rigidity of the flying rail itself is increased, and the mirror finishing is extremely easy. Become.

Since a track having a width of about 10 μm is achieved by the magnetic path forming member and the magnetic path forming member is laminated on the non-magnetic ceramic body, the tock portion is never broken during mirror finishing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A composite magnetic head of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a composite magnetic head of the present invention, FIG. 2A is a perspective view of a magnetic head core, and FIG. 2B is a top view seen from the front gap side.

In FIG. 1, the composite magnetic head comprises a laminated magnetic head core 1 and a slider 2 having a substantially rectangular parallelepiped shape. In the figure, the coil winding fitted to the laminated magnetic head core 1 is omitted.

The slider 2 is made of non-magnetic ceramic such as calcium titanate and has levitation rails 21 and 22 formed on the surface facing the magnetic disk. In addition, a winding slot 23 for winding a coil winding is formed on an end surface on the air outflow end side which is one end surface of the slider 2. In addition, the levitation rails 21 and 22
Each of the air inflow end side and the air outflow end side is tapered.

As shown in FIG. 2A, the magnetic head core 1 is composed of a first core portion 11 having an I-shaped vertical cross section and a second core portion 12 having a C-shaped vertical cross section. And 2
Of the two joint portions where the two core portions 11 and 12 face each other, in the front gap portion FG on the side exposed from the levitation rail 21 of the slider 2, a gap material 13 made of lead glass, silicon dioxide glass, or the like is formed. It is arranged with a thickness of 1 to 0.5 μm. In addition, the front gap part FG
So that the depth of (the joining distance in the height direction) becomes a predetermined value,
The notch 14 is formed in the second core portion 12 so that the interval between the two core portions 11 and 12 becomes gradually wider (apex processing).

Each of the core portions 11 and 12 has a laminated structure of a non-magnetic ceramic body 15, such as calcium titanate, alumina, and silicon nitride, which serves as a base substrate, a magnetic path forming member 16, and a glass body 17.

As shown in FIG. 2B, the magnetic path forming member 16 is a non-magnetic insulating thin film 16a made of silicon dioxide, silicon nitride or the like, or a metallic magnetic film 1 made of sendust, permalo or the like.
6b, a glass layer 18 such as a high melting point glass, and an upper glass body 17 are sequentially laminated. Here, the metal magnetic film 16b and the non-magnetic insulating thin film 16a described above are magnetic path forming members that form a magnetic path, and preferably, a plurality of them are laminated corresponding to the operation of the track width and the high frequency band. There is.
The non-magnetic ceramic body 15 and the glass body 17 are for improving the mechanical strength of the core portion, and the non-magnetic insulating thin film 16a formed on the non-magnetic ceramic body 15 is used.
Is for improving the adhesiveness of the metal magnetic film 16b formed on the non-magnetic insulating thin film 16a. The non-magnetic insulating thin film 16a formed between the metal magnetic films 16b is
The glass layer 18 is for reducing the above-mentioned eddy current loss, and the glass layer 18 is for facilitating the bonding of the glass body 17 on the upper side. The glass body 17 facilitates the production of a laminated magnetic head core described later. It can be omitted by making the glass layer 18 thick.

The magnetic head core 1 described above includes a slider 2
It is adhered to the side surface of the substrate by a joining member 24 such as low melting point glass or epoxy resin. The specific bonding position is the opening of the winding slot 23 and the laminated magnetic hand core 2 on the side surface where the winding slot 23 is opened.
So that their windows coincide with each other, and the laminated magnetic head core 1
The front gap FG is adhered to a position close to the minimum flying height of the levitation rails 21 and 22. In this way, the outer surface of the laminated magnetic head core 1 adhered to the slider 2 is the nonmagnetic ceramic body 15.

After joining the slider 2 and the magnetic head core 1 in this way, a coil (not shown) is wound around the winding slot 23.

Next, the manufacturing process of the laminated magnetic head core 1 and the polishing process of the composite magnetic head of the present invention will be described with reference to FIGS.

In the manufacturing process of the laminated magnetic head core 1, first, a non-magnetic ceramic body 15 from which a plurality of magnetic head cores can be extracted is prepared.

Next, the nonmagnetic insulating thin film 16a is formed on the nonmagnetic ceramic body 15 by a thin film technique such as sputtering.
To have a thickness of about 1 to 5 μm. Then, only the target is exchanged in the same chamber to form the metal magnetic film 16b on the non-magnetic insulating thin film 16a with a thickness of about 2 to 3 μm. Further, a non-magnetic insulating thin film 16a and a metal magnetic film 16b are sequentially formed as needed. Then, the glass layer 18 is formed to have a thickness of about 10 μm on the metal magnetic film 16b. As a result, a laminated body in which the magnetic path forming member and the glass layer 18 are formed on the non-magnetic ceramic body 15 is obtained. Further, the glass body 17 on the upper side is placed on the glass layer 18 and heated to such an extent that the glass layer 18 can be softened to form a laminated body 30 in which the glass layer 18 and the glass body 17 are joined. .. (Fig. 3
(See (a)).

Next, this laminated core member is formed into a predetermined shape.
Cut out the laminated core member 31 to be the one core portion (see FIG. 3).
(See (b)).

Next, a laminated core member joined body 32 is formed by joining the cut glass body 17 of the laminated core member 31 and the nonmagnetic ceramic body 15 of another laminated core member 31 in contact with each other in the thickness direction. For the joining at this time, the above-mentioned glass body 17 is melted and joined. (Fig. 3
(See (c)).

The two laminated core member bonded bodies 32 are processed,
The core member body 33 that becomes the first core portion 11 and the second core portion 1
The core member body 34 which becomes 2 is created. In addition, in FIG.3 (d), only the C-shaped core member body 34 is shown. In addition, a notch 14 is formed by apex processing on the surface of the C-shaped core member body 34 that contacts the core member body 33 by apex processing in order to control the gap depth.

Next, the two core member bodies 33, 34
Are heated and melt-bonded to each other with a glass 35 serving as the gap material 13 such as silicon dioxide or lead glass so as to have a predetermined gap length, for example, 0.1 to 0.5 μm (see FIG. 3).
(E), the notch 14 formed in the core member body 34 and the core member body 33 are fixed to each other with the reinforcing glass 36. Then, the laminated magnetic head core 1 shown in FIG. 2 is achieved by cutting the joined body of the two core member bodies 33 and 34 at the glass body 17 portion.

According to the laminated magnetic head core 1 having the above structure, the magnetic path forming member 1 formed in the core portions 11 and 12 is formed.
6, the magnetic permeability μ is improved as compared with the conventional MIG type magnetic head (not shown) in which the metal magnetic film is formed on the entire contact surfaces of the two core parts made of the ferrite member. Core efficiency is improved. For example, even if the conventional MIG type magnetic head is optimally formed, the core efficiency is about 0.74, but the structure of the present invention has a core efficiency of 0.83 and about 11
It was confirmed that the percentage also improved.

The laminated magnetic head core 1 thus formed is adhered to the side surface of the slider 2 having the flying rails 21 and 22 and the winding slot 23 by a low melting point joining member 24. As a specific bonding method, a low melting point bonding glass rod is placed in a gap between the flying rail 21 on the side where the laminated magnetic head core 1 is bonded and the laminated magnetic head core 1, and the laminated magnetic head core 1 and the slider are attached. Two
Are temporarily mechanically held by a clap or the like, and the low melting point bonding glass rod is heated and melted and gradually cooled to achieve the bonding. It is important to select, as the heating and melting temperature, a temperature at which only the low melting point joining member 24 can be softened.

After the laminated magnetic head core 1 and the slider 2 are joined by the joining member 24 as described above, the surfaces of the levitation rails 21 and 22 are mirror-finished and the front zip FG is formed.
A polishing process is performed to control the gap depth to the final value. Specifically, the composite magnetic head is bonded and fixed on a ramping jig, and lapping is performed from the upper surface side of the slider 2.

Finally, the composite magnetic head is removed from the ramping jig, and the coil winding is wound around the magnetic head core 1 a predetermined number of times to complete the composite magnetic head.

According to the present invention having the above configuration,
The following effects can be expected.

(1) The magnetic path forming member formed in the core portions 11 and 12 improves the magnetic permeability μ and the core efficiency.

(2) Since the laminated magnetic head core 1 is exposed to the side surface of the slider 2 in the above polishing process, the gap depth of the front gip FG can be directly measured. , The measurement accuracy is dramatically improved.

(3) Since the laminated magnetic head core 1 is adhered to the side surface of the slider 2, it is not necessary to form a core slit in the slider 2 as in the prior art, so that there is no ski jump that has occurred in the prior art. The composite type magnetic head has excellent CSS characteristics.

(4) The magnetic path member 16 of the laminated magnetic head core 1 can be formed to have a predetermined thickness in accordance with the recording track width of the magnetic disk, for example, a track width of about 10 μm, and the manufacturing process thereof is simplified. It

(5) Since the magnetic path member 16 is adhered so as to be protected by the non-magnetic ceramic body 15 of the laminated magnetic head core 1, the magnetic path member 16 is not accidentally damaged during the above-mentioned polishing process. Does not occur.

Although the laminated magnetic head core 1 is adhered to the side surface of the slider 2 in the above embodiment,
As shown in FIG. 4A, a recess 25 is formed in the slider 2 such that the laminated magnetic head core 1 fits from the side surface side of the slider 2 on the side surface of the slider 2 at the bonded portion of the laminated magnetic head core 1. You may. When the recess 25 is formed so as to reach the levitation rail 21 and the laminated magnetic head core 1 is fitted in a part of the levitation rail 21, the shape of the non-magnetic ceramic body 15 is changed. The notch 19 is previously formed in the non-magnetic ceramic body 15 of the laminated magnetic head core 1, and the flying rail 21
The positive pressure may be controlled to be the same as that of the above.

Further, as shown in FIG. 4 (b), the laminated magnetic head core 1 and the slider 2 are arranged so that the laminated magnetic head core 1 and the side surface of the slider 2 are securely bonded.
The joining member 2 penetrating in the height direction on any of the contact surfaces with
The groove 26 filled with 4 may be formed.

[0041]

According to the present invention, the core portion forming the magnetic path of the magnetic head core is laminated in the thickness direction, and the magnetic path forming member made of the metal magnetic film is formed inside.
The magnetic permeability in the magnetic path is improved, which results in a magnetic head core with high core efficiency, and furthermore, the magnetic head core and the slider are extremely easily bonded to each other.
The composite magnetic head has excellent characteristics and can control the gap depth of the front gap with high accuracy.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a composite magnetic head of the present invention.

FIG. 2 shows a magnetic head core used in the composite magnetic head of the present invention, (a) is an external perspective view, and (b) is an enlarged view of a front gap portion.

3 (a) to 3 (e) are schematic views each illustrating a manufacturing process of a magnetic head core.

4A and 4B are external perspective views of another composite magnetic head of the present invention.

FIG. 5 is an external perspective view showing a conventional composite magnetic head.

[Explanation of symbols]

 1 ... Magnetic head core 2 ... Slider 11 ... 1st core part 12 ... 2nd core part 15 ... Non-magnetic ceramic body 16 ... Magnetic path formation member 16a ... ... Nonmagnetic insulating thin film 16b ... Metal magnetic film 18 ... Glass layer 17 ... Glass body

Claims (3)

[Claims] 1. A composite magnetic head characterized in that a magnetic head core formed by laminating a non-magnetic ceramic body and a magnetic path forming member is bonded to a side surface of a non-magnetic slider that is floated facing a magnetic disk. 2. The composite magnetic head according to claim 1, wherein the magnetic path forming member is formed by laminating a plurality of metal magnetic films. 3. The magnetic path forming member is formed wider than the width of a recording / reproducing track band formed on a magnetic disk,
3. The composite magnetic head according to claim 1, wherein the width of the magnetic path forming member exposed on the surface facing the magnetic disk is substantially the same as that of the recording track band.