JPH05303715A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To provide the floating magnetic head with lowered magnetic resistance and corresponding to miniaturization by forming a magnetic film with the high saturation magnetic flux density at the bottom of a magnetic head core by using a thin film formation technique. CONSTITUTION:In the floating magnetic head mounting magnetic head cores 21 and 22 on a slider, reinforcing glass is placed between the lower end sections of a 1st magnetic head core 21 and a 2nd magnetic head core 22 comprising the magnetic head core. Further a magnetic thin film 24 is formed over the lower end sections of the 1st magnetic head core 21 and the 2nd magnetic head core 22. The magnetic resistance other than a front gap section FG is made substantially zero, improving the magnetic efficiency of the core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a magnetic disk or the like for recording / reproducing information connected to a computer or the like, and particularly for recording / reproducing information by floating on a rotating magnetic disk medium. The present invention relates to a floating magnetic head for performing.

[0002]

2. Description of the Related Art In floating magnetic heads, high-speed access and high-speed information processing have been advanced, and miniaturization of magnetic heads is required.

In a conventional floating type magnetic head, as shown in FIG. 12, a ring-shaped magnetic core 102 is attached to a slider 101 made of non-magnetic ceramic by an adhesive member 103 such as glass or epoxy resin. Further, a coil winding (not shown) is applied to the ring-shaped core 102 to perform electromagnetic conversion.

The slider 101 has a substantially rectangular parallelepiped shape, and the flying rail 10 is provided on the surface side facing the magnetic disk or the like.
4, 105 are formed in the longitudinal direction, a winding slot 106 is formed on the air outflow end surface, and a core slot 107 for mounting the core 102 inward from the air outflow end surface of the levitation rail 104 is formed. There is.

In the magnetic head core 102, as shown in FIG. 13, a first core member 110 having an I-shaped cross section and a second core member 111 having a C-shaped cross section are joined together via a non-magnetic gap member 112. It has a structure. by this,
The structure has a front gap portion FG located on the magnetic disk side (upper side in the figure) and a back gap portion BG on the opposite side.

In the conventional floating type magnetic head, the slider 101 and the magnetic head core 102 are joined by temporarily assembling and temporarily holding the core 102 with the back surface of the slider 101 as a reference, and an adhesive member in the gap between the core slot 107 and the magnetic head core 102. A glass rod to be 103 is placed, and the glass rod is baked and melted to fill the gap. Next, the temporary holding is removed, and the gap between the core slot 107 and the magnetic head core 102 is filled and hardened with an epoxy resin from the back surface side of the slider 101 and fixed.

At this time, the glass which is the adhesive member 103 is projected on the front surface side of the slider 101, and the epoxy resin which is the adhesive member 103 is projected slightly on the rear surface side of the slider 101. These protruding parts are to be removed by lapping or the like.

[0008]

In recent years, hard disk drive devices are rapidly becoming smaller and thinner, and magnetic heads are also required to be smaller and thinner.

If the slider 101 in the above-mentioned conventional composite magnetic head is made smaller and thinner, naturally,
The ring-shaped magnetic head core 102 also becomes smaller. Further, in order to maintain a sufficient electromagnetic change characteristic, it is necessary to secure a sufficient number of turns of the winding, and the opening area of the winding window 113 of the magnetic head core 102 must be increased.

That is, in order to reduce the size of the magnetic head core 102 and maintain the winding window 113 with a predetermined opening amount, the front gap portion FG and the back cap portion BG of the first and second magnetic head core members 110 and 111 are formed. The area of the joint surface is reduced, and in particular, as shown in FIG. 14, it is desirable that the back gap portion BG is zero in terms of a magnetic circuit in order to achieve high performance. Since the non-magnetic gap member 112 is interposed in the BG, the magnetic resistance R cannot be made substantially zero.

Further, as the size and thickness are reduced, the junction area of the back gap BG is inevitably reduced, and the loss due to the magnetic resistance R of the back gap BG on the magnetic circuit cannot be ignored.

The present invention has been devised in view of the above-mentioned problems, and by forming a magnetic thin film having a high saturation magnetic flux density on the back gap portion side, the magnetic resistance can be lowered and the size can be reduced. A compatible floating magnetic head can be provided.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a magnetic head core formed by abutting two magnetic head core members on a slider having a flying rail extending in the longitudinal direction on a surface facing a magnetic recording medium has a magnetic gap. In a floating magnetic head formed by joining parts so as to be on the magnetic recording medium side, the magnetic head core has an end portion on the side opposite to the magnetic gap portion, and a reinforcing glass is filled between two magnetic head core members. And 2 on the surface of the reinforcing glass.
It is a floating magnetic head coated with a magnetic thin film having a high saturation magnetic flux density for magnetically connecting two magnetic head core members.

[0014]

As described above, in the present invention, the back gap portion BG does not exist on the side opposite to the magnetic gap portion which is the front gap portion FG of the magnetic head core, and the magnetic gap portion which is the front gap portion FG does not exist. At the end on the opposite side, a magnetic thin film having a high saturation magnetic flux density for magnetically connecting both magnetic head core members is formed between the first and second magnetic head core members forming the magnetic head core. The magnetic resistance can be substantially zero. As a result, the recording / reproducing efficiency is improved, and the floating magnetic head having high electromagnetic conversion characteristics is obtained.

Further, since the reinforcing glass is filled between the two magnetic head core members, the magnetic thin film is formed after grinding the end portions of the two magnetic head core members to the extent that the reinforcing glass remains. Therefore, the floating magnetic head can be downsized.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a recording medium side of a floating magnetic head according to the present invention, and FIG. 2 is a perspective view of only a magnetic head element in a bonded state. The floating magnetic head is composed of a slider 1 and a magnetic head core 2. A coil winding is wound around the magnetic head core 2, but it is omitted in the figure.

The slider 1 is made of calcium titanate (C
It is made of a high hardness ceramic member such as aTiO ₃ ) and has a substantially rectangular parallelepiped shape. Levitation rails 11 and 12 are formed on the surface side of the slider 1 facing the magnetic recording medium. Further, a core slit 13 extending in the longitudinal direction is formed at the air outflow end of the levitation rail 11, and further,
A winding slot 14 that intersects the core slit 13 is formed on the air outflow end surface of the slider 1.
The magnetic head core 2 is fixed to the core slit 13 by a joining member 15 such as glass or epoxy resin.

The magnetic head core 2 is, as shown in FIG.
A first magnetic head core member 21 made of Mn-Zn ferrite or the like, a second magnetic head core member 22 made of Mn-Zn ferrite or the like, both magnetic head core members 21,
22 is integrated in a ring shape and a gap member 23 that forms a magnetic gap portion.

The first magnetic head core member 21 has a substantially I shape, and the second magnetic head core member 22 has a substantially L shape. A non-magnetic glass 23, which is a magnetic gap member, is interposed at a joint between the first magnetic head core member 21 and the second magnetic head core member 22 on the magnetic recording medium side, and forms a front gap portion FG.

Further, both core members 2 are provided at the ends (lower side in FIG. 2) of the first magnetic head core member 21 and the second magnetic head core member 22 on the side opposite to the front gap portion FG.
A reinforcing glass 25 is filled between the Nos. 1 and 22. Further, a magnetic thin film 24 having a high saturation magnetic flux density such as sendust or permalloy is formed on the reinforcing glass 25 and at the end portions (hereinafter, referred to as lower surfaces) of the first magnetic head core member 21 and the second magnetic head core member 22. ing.

Such a magnetic head core 2 has a ring shape as a whole, and the ring-shaped window portion is used as a winding window 30 for winding a coil winding.

Further, the second magnetic head core member 22 includes
A notch portion 26a is formed toward the front gap portion FG. The notch portion 26 a concentrates the magnetic flux flowing in the second magnetic head core member 22 toward the front gap portion FG, and the joining reinforcing glass 26 is provided between the notch portion 26 a and the first magnetic head core member 21.
It is for filling b.

Further, on the surfaces of the first and second magnetic head core members 21 and 22 on the front gap portion FG side, a track portion is processed so that the thickness thereof becomes thin according to the recording track width of the magnetic recording medium. 29 is formed.

The gap member 23 is made of a single substance or a laminated body of a non-magnetic oxide such as silicon dioxide or lead glass, and produces a steep leakage magnetic field from the front gap portion FG to the outside. In order to improve the output characteristics of the leakage magnetic field, magnetic thin film layers 27 and 28 of high saturation magnetic flux density such as sendust and permalloy are deposited on the joint surfaces of the first and second magnetic head core members 21 and 22. There is. The magnetic thin film layers 27 and 28 do not necessarily have to be formed on both the magnetic head core members 21 and 22.
For example, it may be formed only on the first magnetic head core member 21 side, or may not be formed at all.

The magnetic head core 2 having the above structure is temporarily held in the core slit 13 of the slider 1, and the adhesive member 15 is filled in the gap between the magnetic head core 2 and the slider 1.
Specifically, a low-melting-point glass rod serving as the adhesive member 15 is placed in the gap between the magnetic head core 2 and the slider 1, heated, melted, filled in the gap, and cured. Further, the epoxy resin may be filled and cured.

After that, the coil winding is wound through the winding slot 14 and the winding window 30 by a predetermined number of turns, for example, 30 turns. The tip of this winding is connected to the controller of the magnetic recording device.

In the floating type magnetic head thus formed, the magnetic thin film 24 is formed on the lower surface side of the magnetic head core 2 as shown in FIG. In the present invention, unlike the conventional case, the back gap portion BG having the non-magnetic gap member 112 similar to the front gap portion FG is not formed. Therefore, the magnetic flux flowing on the lower surface side of the magnetic head core 2 flows from the second magnetic head core 22 to the magnetic thin film 24, and further from the magnetic thin film 24 to the first magnetic head core 21. Moreover, it will flow in the opposite direction.
The broken line X in FIG. 3 indicates the flow of magnetic flux of the first core member 21 and the second core member 22. The magnetic resistance other than the front gap portion FG can be made substantially zero, and accordingly, high electromagnetic conversion characteristics can be obtained.

The magnetic thin film 24 formed so as to straddle the first core member 21 and the second core member 22 and the interface between the first core member 21 and the second core member 22 are Although a pseudo magnetic gap is generated, this pseudo gap is about 100 angstroms, and its magnetic resistance is smaller than that of the conventional gap member 112 of the non-magnetic material layer of about 0.3 μm of the back gap portion BG. The gap is negligible.

A method of manufacturing the magnetic head core 2 used in the floating magnetic head of the present invention will be described with reference to FIGS.

First, as shown in FIG. 4, the first magnetic head core base material 3 which becomes the elongated first magnetic head core member 21.
1 and a second magnetic head core base material 32 to be the second magnetic head core member 22 are prepared. The elongated first magnetic head core base material 31 has an I-shaped vertical cross-sectional shape, and the second magnetic head core base material 32 has a C-shaped vertical cross-sectional shape. At this time, the main surface 3 on the long side where the first magnetic head core base material 31 and the second magnetic head core base material 32 are respectively joined
1a, 32a and 32b are mirror-finished by lapping free abrasive grains having a grain size of 1 μm or less.

Next, as shown in FIG. 5, the magnetic thin film layers 27 and 2 are formed on the bonding surface 31a of the first magnetic head core base material 31 and the bonding surfaces 32a and 32b of the second magnetic head core base material 32, respectively.
Laminated films 33 and 34 in which the magnetic thin film layer to be 8 and the gap layer to be the gap member 23 are laminated are respectively deposited.
Specifically, the laminated bodies 33 and 34 are formed by forming a magnetic thin film layer such as a sendant by a sputtering method, and further sequentially laminating a silicon dioxide layer and a low melting point glass layer from the upper portion by a sputtering method.

Next, as shown in FIGS. 6 and 7, the laminated body 33 of the first magnetic head core base material 31 and the laminated body 34 of the second magnetic head core base material 32 are brought into contact with each other. Then, between the surface 32c forming the cutout portion 26a of the second magnetic head core base material 32 and the first magnetic head core base material 31, a joint reinforcing member 35 that finally becomes the joint reinforcing glass 26b is filled and cured. To do. Specifically, the lead glass rod 35a which becomes the joining reinforcing member 35 is arranged and heated at a predetermined temperature. As a result, both the low-melting-point glass layers located on the surfaces of the laminated bodies 33 and 34 are melted, and the lead glass rod 35a is melted, and the space between the surfaces 32c and 31a is filled and hardened.
As the lead glass rod 35a, for example, lead-based glass that softens and flows at 600 ° C. is used. That is, in the joined body 36 of the magnetic head core base materials 31 and 32, the front gap portion FG side is joined by melting the low melting point glasses of the laminated bodies 33 and 34 to each other to form the gap portion FG. The reinforcing members 35 firmly bond each other.

Next, as shown in FIGS. 8 and 9, a series of reinforcing glass 37, which finally becomes the reinforcing glass 25, is filled and cured on the lower surface side of the winding window 30. In particular,
A glass rod 37a to be the reinforcing glass 37 is placed on the lower side in the winding window 30 and heat-treated. As the glass rod 37a, compared to the lead-based glass rod 35a used in the previous step,
Lead-based glass that softens and flows at a low temperature is used.

Then, as shown in FIG. 10, the outer periphery of the bonded body 36 of the first magnetic head core base material 31 and the second magnetic head core 32 is polished, and the first magnetic head core base material 31 and the second magnetic head core material 31 are further polished. The lower side (the upper side in the figure) of the magnetic head core base material 32 is ground and removed. This allows
The reinforcing glass 37 is exposed on the lower surface side of the joined body 36 of the first magnetic head core base material 31 and the second magnetic head core base material 32. By this grinding removal process, the cross-sectional shape of the second magnetic head core base material 32 becomes approximately L-shaped.

Then, as shown in FIG.
2 and the reinforcing glass 37 exposed on the lower surface of the first magnetic head core base material 31 and the second magnetic head core base material 32 exposed by the above-mentioned removal.
The magnetic thin film 38 to be 4 is formed. Specifically, a magnetic thin film 38 having a high saturation magnetic flux density such as sendust or permalloy is deposited by 10 μm or more by a thin film technique such as sputtering.

Finally, as shown by the alternate long and short dash line in FIG. 11, the bonded body 36 is sliced according to the thickness of the magnetic head core 2 and further the track portion 29 is formed on the surface on the side of the front gap portion FG. A magnetic head core equivalent to the magnetic head core shown in 2 is obtained.

In the method of manufacturing the magnetic head core 2 as described above, since the magnetic thin film 24 is formed at the end portion of the magnetic head core 2 opposite to the front gap portion FG, the magnetic flux of the magnetic head core 2 is the first magnetic flux. Magnetic head core member 21
-A magnetic thin film 24 having a high saturation magnetic flux density-The magnetic thin film 24 flows to the second magnetic head core member 21, and the first magnetic head core member 21-the non-magnetic member 23 of the back gap portion BG-the second conventional magnetic head core member 21. The magnetic resistance can be substantially zero as compared with the flow with the magnetic head core member 21.

Further, since the lower end portion of the joined body 36 is ground, the magnetic head core 2 can be easily miniaturized.

Furthermore, for a large number of magnetic head cores,
They can be formed in a batch, which is extremely advantageous in terms of manufacturing cost.

(Other Embodiments) In the above-described embodiment, the bonded body 36 is sliced in the manufacturing process of the magnetic head core 2, that is, the magnetic head core 2 on which the magnetic thin film 24 is already formed is bonded to the slider 1. In consideration of the miniaturization of the slider 1, the magnetic thin film 38 serving as the magnetic thin film 24 is not formed in the manufacturing process of the magnetic head core 2 described above.
The magnetic head core 2 may be bonded to the magnetic head core 2, the back surface side of the slider 1 may be ground, and then the magnetic thin film 24 may be formed.

Further, in the above-mentioned embodiment, in order to cope with high density recording, the magnetic thin film layer 2 of high saturation density is formed in the gap portion.
7 and 28 are formed, the magnetic thin film layers 27 and 28
It may be a normal type floating magnetic head in which is omitted.

Further, in the above-described embodiment, the first magnetic core 21 having the I-shaped vertical cross section and the second magnetic core 22 having the L-shaped vertical cross section.
Although the magnetic head core 2 is formed by using, magnetic cores 21 and 22 both having a substantially L-shaped vertical cross section may be used.

[0043]

According to the present invention, as described above, the magnetic head is
A non-magnetic gap member is not formed on the lower surface side of the magnetic head core, and the flow of magnetic flux is performed by the magnetic thin film formed on the lower surface of the magnetic head core. It can be zero. Therefore, the floating magnetic head has improved electromagnetic conversion characteristics. Further, since the reinforcing glass is filled between the two magnetic head core members, the magnetic thin film can be formed after grinding the ends of the two magnetic head core members to the extent that the reinforcing glass remains. It becomes a floating magnetic head that can be downsized.

[Brief description of drawings]

FIG. 1 is an external perspective view of a floating magnetic head of the present invention on a front surface side.

FIG. 2 is an external perspective view of only the magnetic head core portion of FIG.

FIG. 3 is a schematic diagram illustrating the flow of magnetic flux of the magnetic head core shown in FIG.

FIG. 4 is a perspective view showing one step of the method of manufacturing the magnetic head core of the present invention.

FIG. 5 is a perspective view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 6 is a perspective view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 7 is a side view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 8 is a perspective view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 9 is a side view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 10 is a perspective view showing a step of the method of manufacturing the magnetic head core of the present invention.

FIG. 11 is a perspective view showing one step of the method of manufacturing the magnetic head core of the present invention.

FIG. 12 is an external perspective view of the surface side of a conventional floating magnetic head.

FIG. 13 is an external perspective view of a magnetic head core used in a conventional floating magnetic head.

14 is a schematic diagram illustrating the flow of magnetic flux in the magnetic head core shown in FIG.

[Explanation of symbols]

 1 ... Slider 2 ... Magnetic head core 4, 5 ... Floating rail 21 ... First magnetic head core 22 ... Second magnetic head core 23 ... Gap member 24 ... Magnetic thin film 25 ... Reinforcing glass FG ... Front gap part

Claims (1)

[Claims] 1. A magnetic head core formed by abutting two magnetic head core members on a slider having a flying rail extending in the longitudinal direction on the surface facing the magnetic recording medium, and the magnetic gap portion is on the magnetic recording medium side. In the floating magnetic head thus bonded, reinforcing glass is filled between two magnetic head core members at the end of the magnetic head core opposite to the magnetic gap, and the reinforcing glass is used. 2. A floating magnetic head, characterized in that a magnetic thin film having a high saturation magnetic flux density for magnetically connecting two magnetic head core members is coated on the surface of the magnetic head.