JPH06338023A - Magnetic head - Google Patents

Abstract

PURPOSE:To attain high density recording, to suppress the practical reduction of the track width of a gap part formed at the edge faces of laminated magnetic films on the butted sides and to enhance reproduction output. CONSTITUTION:Laminated magnetic films 1, 2 each formed by laminating magnetic metallic thin films via an insulating film are sandwitched between 1st substrates 3, 4 and 2nd substrates 5, 6 each made of at least magnetic ferrite in the film thickness direction to form magnetic core halves 7, 8 and these core halves 7, 8 are integrated by bonding so that the magnetic films 1, 2 are butted. Magnetic metallic films 101, 102 are disposed on at least the edge faces of the magnetic films 1, 2 on the butted sides and the track width Tw of the resulting magnetic gap is regulated to <=13mum. The objective magnetic head is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mounted on, for example, a video tape recorder, and more particularly to a magnetic head suitable as a high density magnetic recording head.

[0002]

2. Description of the Related Art For example, in the field of magnetic recording, as a magnetic head for high-density recording which is excellent in high frequency characteristics, a so-called laminated structure is formed by laminating thin magnetic metal thin films in many layers with an insulating film interposed therebetween. A magnetic head using a type metal magnetic film (hereinafter referred to as a laminated magnetic film) has been developed. An example of such a magnetic head is a so-called laminate type in which magnetic core halves each having the laminated magnetic film sandwiched by substrates made of a non-magnetic material in the thickness direction are joined and integrated so that the laminated magnetic films are butted. Magnetic head.

In the above-mentioned laminate type magnetic head, a magnetic gap is formed between the abutting surfaces of the laminated magnetic films, and the width of the laminated magnetic film becomes the track width of the magnetic gap. , High density recording is achieved.

However, in such a magnetic head, if the track width is further narrowed in order to achieve higher density recording, that is, the width of the laminated magnetic film is further narrowed, the cross-sectional area of the core forming the magnetic path is reduced. The head efficiency deteriorates. The above tendency is particularly remarkable when the track width is 13 μm or less.

For this reason, conventionally, a method of using magnetic ferrite for the substrate has been proposed in order to prevent deterioration of head efficiency by ensuring the core cross-sectional area. According to this method, even if the track is narrowed, the magnetic ferrite substrate functions as an auxiliary core and a sufficient cross-sectional area of the core is secured, so that the head efficiency is deteriorated as compared with the magnetic head using the non-magnetic substrate. Can be suppressed.

By the way, the above magnetic head is formed as follows. First, on one magnetic ferrite substrate, a laminated magnetic film, which is a laminated metal film in which thin magnetic metal thin films are laminated in many layers with an insulating film interposed, is formed.
The other magnetic ferrite substrate is bonded to this to form a magnetic core half. Next, the magnetic core halves and the magnetic core halves formed in the same manner as these, but the end faces of the laminated magnetic films present as the abutting faces of each other are abutted, and the gap fusion is performed by the glass through the gap film, The magnetic head is completed by joining and unifying. However, in the above magnetic head, since the substrate is composed of magnetic ferrite,
It is necessary to regulate the width (track width) of the end surface of the laminated magnetic film on the abutting side.

Therefore, as a method of regulating the width of the end face of the laminated magnetic film of the above magnetic head on the abutting side, the following method can be mentioned. First, the portions of the pair of magnetic ferrite substrates in the vicinity of the magnetic gap are removed in advance by machining or the like, and the nonmagnetic material is filled therein. Then, after forming a laminated magnetic film on one of the magnetic ferrite substrates and joining the laminated magnetic film to the other magnetic ferrite substrate, cutting is performed at a plane parallel to the track width direction of the laminated magnetic film. As a result, the non-magnetic material and the laminated magnetic film are exposed on the cut surface (butting surface), and the width of the end surface of the laminated magnetic film on the butting side is restricted. However, this method not only complicates the manufacturing process of the magnetic head, but when the ferrite substrate and the non-magnetic material filled in the ferrite substrate are subjected to surface grinding for sputtering the laminated magnetic film, a step is formed between them. Occurs, which affects the film characteristics of the formed laminated magnetic film.

As a method for solving the above problem, a laminated magnetic film is formed on one of the ferrite substrates by sputtering or the like, and after this is joined to the other ferrite substrate,
A method has been proposed in which a track width regulating groove is formed in a portion near the magnetic gap so that the end surface of the laminated magnetic film on the abutting side can be regulated to a predetermined track width.

[0009]

By the way, in the magnetic head using the laminated magnetic film as described above, as a matter of course, the magnetic metal thin film and the insulating film are formed in the gap portion which is the end face on the butt side of the laminated magnetic film. Will be exposed.
At this time, since the portion formed of the non-magnetic insulating film in the gap portion does not function as a magnetic path, the substantial track width of the gap portion is determined by the width of the end surface on the abutting side of the laminated magnetic film. Since the track width is smaller than the apparent track width, the reproduction output is reduced. Such a tendency is particularly remarkable when the track width is 13 μm or less as described above.

Therefore, the present invention has been proposed in view of the actual situation of the related art, and is capable of coping with high density recording, suppressing a substantial reduction in track width, and providing a magnetic head having an improved reproduction output. The purpose is to provide.

[0011]

In order to achieve the above object, the present invention provides a laminated magnetic film formed by laminating magnetic metal thin films with an insulating film interposed between at least a pair of substrates made of a magnetic ferrite material. In a magnetic head in which a pair of magnetic core halves sandwiching in a direction from each other are joined and integrated so as to abut the laminated magnetic films to form a closed magnetic circuit, at least the end face of the laminated magnetic films on the abutting side has a magnetic metal film. Are formed, and Tw ≦ 13 μm when the track width of the magnetic gap is Tw.

[0012]

In the present invention, since the magnetic metal film is formed on the abutting side end face of the laminated magnetic film in which the magnetic metal thin films are laminated with the insulating film interposed therebetween, the gap portion is composed of only the magnetic metal film. It Therefore, the entire gap portion functions as a magnetic path, and a substantial reduction in the track width of the gap portion is suppressed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In the magnetic head of this embodiment, as shown in FIG. 1, the laminated magnetic films 1 and 2 are sandwiched between the first substrates 3 and 4 and the second substrates 5 and 6 made of a magnetic ferrite material in the thickness direction. It is composed of a pair of magnetic core halves 7 and 8.
102 is formed, and the magnetic metal films 101 and 10 are formed.
The two are abutted and integrated by a fused glass 9 so that they are abutted. The magnetic core half body 7,
A magnetic gap g is formed between the abutting surfaces of No. 8.

As described above, the magnetic core halves 7 and 8 include the laminated magnetic films 1 and 2 serving as the main cores, and the first substrates 3 and 4 serving as the auxiliary cores sandwiching the laminated magnetic films 1 and 4 from the thickness direction. Substrate 5,6
And the first substrates 3 and 4 are laminated so as to sandwich the laminated magnetic films 1 and 2 adhered and formed on one main surface of the second substrates 5 and 6 so as to be joined and integrated. Has been done.

The laminated magnetic films 1 and 2 are as shown in FIG.
And thin magnetic metal for the purpose of improving high frequency characteristics.
The thin films 1a, 1b, 1c and 2a, 2b, 2c are insulating films 1.
0b ₁, 10b₂, 11b₁, 11b₂Stacked through
Is a laminated metal film. And the second group
At the interfaces between the plates 5 and 6 and the magnetic metal thin films 1a and 2a,
Underlayer film that functions to improve the adhesive strength of these materials and prevent reactions
Films 10a and 11a are formed.

Incidentally, the magnetic metal thin films 1a, 1b, 1c.
And 2a, 2b, and 2c are composed of sendust (Fe-Al-Si) or Fe-Ru-Ga-Si,
Alternatively, a crystalline magnetic metal material obtained by adding O, N or the like to them, a Fe-based or Co-based microcrystalline magnetic metal material, or the like can be used. The thickness of the magnetic metal thin film is preferably 2 to 5 μm per layer in order to improve high frequency characteristics.

Further, one of the insulating films 10b ₁ , 10b ₂ , 1
Examples of 1b ₁ and 11b ₂ include SiO ₂ and Ta ₂ O ₅
An oxide film such as SiN ₄ or a nitride film such as Si ₃ N ₄ is used. The thickness of the insulating film is, for example, 0.1 to 0.3.
About μm is preferable.

Further, a second film is formed on the base films 10a and 11a.
Since it is necessary to increase the adhesive force between the substrates 5 and 6 and the magnetic metal thin films 1a and 2a, an oxide film such as SiO ₂ or Ta ₂ O ₅ , S
A nitride film of i ₃ N ₄ or the like, a metal film of Cr, Al, Si, Pt or the like and an alloy film thereof, or a laminated film combining them is used.

In this embodiment, sendust films are used as the magnetic metal thin films 1a, 1b, 1c and 2a, 2b, 2c, and SiO ₂ films are used as the insulating films 10b ₁ , 10b ₂ , 11b ₁ and 11b ₂ . The film thickness at that time is T in FIG.
In order to set the track width of the magnetic gap g shown by w to 5 μm, the magnetic metal thin films 1a, 1b, 1c and 2a, 2b, 2c _per layer are set to 3 μm, and the insulating films 10b ₁ and 10 are formed.
b ₂ , 11b ₁ and 11b ₂ were 0.2 μm. Further, as the base films 10a and 11a, a SiO ₂ film having a film thickness of 50 nm was used.

The first substrates 3 and 4 and the second substrates 5 and 6 are made of magnetic ferrite material as described above. As the magnetic ferrite material, any one of single crystal ferrite, polycrystal ferrite, a joining material of single crystal ferrite and polycrystal ferrite, single crystal ferrite having a different surface index, and these joining materials may be used.

In the present embodiment, the first substrate 3, 4 and the second substrate 5, 6 are made of single crystal ferrite, and the plane index thereof is (110) for the medium facing surface,
The laminated magnetic film bonding surface is (110) and the abutting surface is (10).
0).

Further, as shown in FIG. 2, the first substrate 3, 4 and the second substrate 5, 6 as described above have a glass film 18,
The first substrates 3, 4 are joined and integrated by 19
Further, between the second substrates 5 and 6 and the glass films 18 and 19, underlayer films 16a, 16b and 17 are provided to prevent these reactions.
a and 17b are provided.

As the glass films 18 and 19, those formed by sputtering low melting point glass or those formed by applying frit glass by spin coating or the like can be used, and the film thickness thereof is 0.1 μm. ~
0.5 μm is preferable. The base films 16a, 16b and 17a, 17b are made of SiO ₂ , Ta ₂ O ₅ or the like for the purpose of preventing reaction between the magnetic metal thin films 1c, 2c or the first substrates 3, 4 and the glass films 18, 19. Oxide film, Si ₃
A nitride film such as N ₄ or the like, a metal film such as Cr, Al, Si, Pt or the like, an alloy film thereof, or a laminated film combining them can be used.

In this embodiment, the base film 16
Cr films having a thickness of 0.1 μm are used as a, 16b and 17a, 17b, and a thickness of 0.2 μ is used as glass films 18 and 19.
A Pb-based glass film formed by sputtering m was used.

Further, in particular, in the magnetic head of this embodiment, the magnetic metal films 101 and 102 are formed on the abutting surfaces of the magnetic core halves 7 and 8 as described above, and these are abutted. The magnetic core halves 7 and 8 are joined and integrated by a fused glass 9.

In the magnetic core halves 7 and 8, since the first substrates 3 and 4 and the second substrates 5 and 6 are made of a magnetic ferrite material, the abutting sides of the laminated magnetic films 1 and 2 will be described. The width of the end face of is regulated. That is, as shown in an enlarged manner in FIG. 2, the widths of the end faces of the magnetic core halves 7 and 8 on the abutting side are equal to the widths of the track width regulating grooves 14a, 14b and 1.
5a and 15b, and the width of the end surface of the magnetic metal films 101 and 102 formed along the shape of the abutting surfaces of the magnetic core halves 7 and 8 on the abutting side is naturally regulated. The track width Tw of the magnetic gap g which is formed between the end faces on the side and operates as a recording / reproducing gap is also determined. In addition, the laminated magnetic films 1 and 2
Since the gap portion, which is the end surface on the butting side, is composed of only the magnetic metal film, the substantial track width of the gap portion does not decrease. The magnetic gap g is formed as a magnetic gap having a predetermined azimuth angle.

Underlayer films 103 and 104 are provided at the interfaces between the magnetic core halves 7 and 8 and the magnetic metal films 101 and 102 in order to improve their adhesion.

The magnetic metal films 101, 102 may be made of the same material as that for forming the magnetic metal thin films 1a, 1b, 1c and 2a, 2b, 2c, and are 0.5-.
It is preferably formed with a film thickness of 10 μm. On the other hand, as the base films 103 and 104, SiO ₂ , Ta ₂ O _{5 is used.}
Oxide film, etc., nitride film such as Si ₃ N ₄ , Cr, Al,
A metal film of Si, Pt or the like, an alloy film thereof, or a laminated film combining them is used.

In this embodiment, the magnetic metal film 1 is used.
Sendust having a film thickness of 4 μm was used as 01 and 102, and a Cr film having a film thickness of 50 nm was used as the base films 103 and 104.

Further, in order to prevent the reaction between the laminated magnetic films 101 and 102 and the fused glass 9, a reaction preventive film (not shown) is provided between them. As the reaction preventing film, an oxide film of SiO ₂ , Ta ₂ O ₅ or the like, Si ₃ N
A nitride film such as ₄ or the like, a metal film such as Cr, Al, Si, Pt or the like, an alloy film thereof, or a laminated film combining them can be used. The film thickness of the reaction preventive film is preferably 0.05 μm or more. In this example,
A 0.2 μm Cr film was used as a reaction preventing film.

Furthermore, winding grooves 12, 13 for coil winding and glass grooves 22, 23 are provided on the abutting surface side of the magnetic core halves 7, 8, and the bonding strength of the magnetic core halves 7, 8 is provided. In order to ensure the above, the fusion glass 9 is also melt-filled in these. Furthermore, in this magnetic head,
A step is provided on the sliding surface of the magnetic recording medium that is in sliding contact with the magnetic recording medium to ensure contact with the magnetic recording medium, and the winding state of the coils formed in the winding grooves 12 and 13 is improved. Therefore, auxiliary winding grooves 20 and 21 are formed at positions facing the winding grooves 12 and 13, respectively.

In the magnetic head of this embodiment having the above structure, the track width Tw of the magnetic gap g is Tw.
Since ≦ 13 μm, a narrow gap is formed and high density recording can be achieved. Further, since the magnetic metal film is formed on the end faces of the pair of magnetic core halves on the abutting side of the laminated magnetic films, the entire gap portion formed on the end faces functions as a magnetic path, and the gap portions are substantially formed. It is possible to suppress the reduction of the track width and improve the reproduction output.

Therefore, the reproducing outputs of the magnetic head of this embodiment and a conventional magnetic head having no magnetic metal film on the abutting surfaces of the magnetic core halves were compared. The above-mentioned conventional magnetic head has the same structure as the magnetic head of the present embodiment and does not have only the magnetic metal film formed on the abutting surface. The reproduction output was measured as follows. That is, a vapor deposition tape for Hi8 was used as a magnetic recording medium, and a reproduction output at a frequency of 15 MHz was measured using a rotary drum fixed head type electromagnetic conversion characteristic measuring device at a peripheral speed of 7.5 m / s. As a result, the magnetic head of this embodiment was able to obtain a reproduction output about 0.7 dB higher than that of the conventional magnetic head. Considering that the track width of the magnetic gap of the magnetic head of the present example and the conventional magnetic head is 5 μm, the reproduction output accompanying the substantial reduction of the track width of the gap portion due to the insulating film when the track width is 5 μm. It almost coincides with the decrease.

Next, a method of manufacturing the above-described magnetic head of FIG. 1 will be described in the order of steps. First, FIG.
As shown in (a), a ferrite substrate 24 is prepared, and one main surface 24a of the ferrite substrate 24 is mirror-finished by polishing or the like.

Next, one main surface 2 of the ferrite substrate 24
Layered magnetic films 25 and 26 are formed on the strip 4a by mask sputtering so as to be parallel to each other in a strip shape at a predetermined interval so as to be parallel to each other.

When forming the laminated magnetic films 25 and 26, the film thickness is 50 nm as shown in FIG. 3B in order to improve the adhesive force with the ferrite substrate 24 as described above.
A base film 27 made of SiO ₂ is previously formed. Then, in order to improve high frequency characteristics, the laminated magnetic film 25,
Reference numeral 26 denotes a metal magnetic thin film 25a, 25b, 25 made of sendust having a small film thickness via an insulating film 28 made of SiO _2.
c (one laminated magnetic film 26 is omitted in the drawing) is formed by laminating a number of layers. The laminated magnetic film 2
Since it is necessary to form the track width regulating groove in the subsequent process, the thicknesses of 5, 5 and 26 are preferably 1.2 to 3 times the target recording track width. When forming the magnetic head of this embodiment, an insulating film 28 having a film thickness of 0.2 μm is formed in order to form a magnetic gap having a track width of 5 μm.
Magnetic metal thin film 25 with a thickness of 3 μm per layer
Three layers a, 25b and 25c were stacked.

Further, a base film 36 is formed on the laminated magnetic films 25 and 26 on the ferrite substrate 24 as shown in FIG. 4 (only the laminated magnetic film 25 is shown in the drawing). After that, the glass film 37 is formed. In this embodiment, a Cr film having a thickness of 0.1 μm is formed as the base film 36, and a Pb-based low melting point glass having a thickness of 0.2 μm is formed as the glass film 37 by sputtering.

Further, as shown in FIG. 5, a base film 38 and a glass film 39 are formed on the other ferrite substrate 35 similarly to the ferrite substrate 24.

The ferrite substrate 24 having the laminated metal film formed thereon and the ferrite substrate 35 are shown in FIG. 6 (a).
As shown in, the glass films 37 and 39 formed on the abutting surfaces are abutted against each other and pressure-bonded at 500 ° C.
Heat to 700 ° C. As a result, the glass films 37 and 39 formed on the abutting surfaces are fused as shown in FIG. 6B.

In this embodiment, the glass films 37 and 39 are formed on both of the pair of ferrite substrates 24 and 35 and the glass substrates 37 and 39 are fused together.
Alternatively, a glass film may be formed on at least one of the above and fused.

Next, the laminated substrate integrated and joined is
The magnetic head is cut at the positions indicated by the line AA ', the line BB', and the line CC 'in FIG. 7 at the same angle as the azimuth angle given to the magnetic head to be manufactured.

Next, after removing unnecessary portions of ferrite by using a surface grinder or the like, each magnetic core half block 4 is removed.
As shown in FIGS. 8 and 9, winding grooves 42 and 43 for winding coils and glass grooves 44 and 45 for glass fusion are formed on the abutting surfaces of Nos. 0 and 41, respectively.

The winding grooves 42 and 43 and the glass grooves 44 and 4
5 is formed as a groove having a substantially U-shaped cross section, but one side surface 42a, 43a of the winding groove 42, 43 is an inclined surface in order to restrict the depth of the magnetic gap g.
The other side surfaces 42b, 43b of the winding grooves 42, 43
May be an inclined surface or a vertical surface.

Next, as shown in FIGS. 10 and 11, in each of the magnetic core half blocks 40 and 41, a track width restricting groove 46a for securing the bonding strength of the blocks and restricting the track width of the magnetic head is formed. , 46b and 47a, 47b
To form.

The track width regulating grooves 46a, 46b and
And 47a and 47b on both sides of the laminated magnetic films 25 and 26.
Therefore, the laminated magnetic film is placed at a position close to the laminated magnetic films 25 and 26.
Notch a part of the elastic films 25 and 26,
Formed over the entire block as a groove with a trapezoidal cross section
To be done. The track width regulating grooves 46a, 46b and 4
One side surface 46a on the side of the laminated magnetic films 25 and 26 of 7a and 47b
₁, 46b₁And 47a ₁, 47b₁Is an inclined surface
The width of the end faces of the laminated magnetic films 25 and 26 on the abutting side.
To regulate the track width of the magnetic gap.
Has been done.

Then, as shown in FIGS. 12 and 13, the magnetic metal films 105, 1 are formed on the entire abutting surfaces of the magnetic core half blocks 40, 41 by sputtering.
06 is formed.

When forming the magnetic metal films 105 and 106, as described above, the magnetic core half blocks 40 and 41 are formed.
In order to improve the adhesive force between the base film 107 and the like, as shown in FIG. 14 (only the magnetic core half block 40 is shown in FIG. 14), a base film 107 made of a Cr film having a film thickness of 50 nm is previously formed. Then, a sendust film having a film thickness of 4 μm is formed as the magnetic metal film 105.

Next, each magnetic core half block 40, 4
A Cr film (not shown) having a film thickness of 0.2 μm is formed as a reaction preventing film on the abutting surfaces of the magnetic core half blocks 4
Gap forming surfaces 40a, 4 which are 0, 41 butting surfaces
1a is formed by polishing the magnetic metal films 105, 10
Mirror finishing is performed so that the width of the end face of 6 on the butting side becomes a predetermined track width.

Then, one magnetic core half block 40
After forming a gap film (not shown) on the gap forming surface 40a of FIG. 15 or on the gap forming surfaces 40a and 41a of both magnetic core half blocks 40 and 41, as shown in FIG. Blocks 40 and 41
The end faces of the magnetic metal films 105 and 106 on the abutting side are aligned with each other, and bonding is performed while pouring the fused glass 48.

As a result, these magnetic core half blocks 4
0 and 41 are joined and integrated by a fused glass 48,
A magnetic gap g that operates as a recording / reproducing gap is formed between the abutting surfaces of the laminated magnetic films 25 and 26.

Then, after forming a winding auxiliary groove in the magnetic core half block joined and integrated by the fused glass 48, the sliding surface of the magnetic recording medium is subjected to cylindrical polishing to be subjected to contact width processing to obtain a predetermined chip. Cut to shape.

As a result, high density recording as shown in FIG. 1 can be achieved, and a magnetic head having good reproducing characteristics is completed.

Examples of the magnetic head to which the present invention is applied include the magnetic head shown in FIG. 16 in addition to the above-mentioned ones. In other words, the magnetic metal films 107,
108 is provided, and such a magnetic head is manufactured through substantially the same manufacturing process as the above-described magnetic head. That is, the laminated magnetic films 1 and 2 are formed on the second substrates 5 and 6.
Then, the first substrate is joined to form the pair of magnetic core halves 7 and 8. And the magnetic core halves 7, 8
After the magnetic metal films 107 and 108 are formed on the abutting surfaces of the magnetic metal films 107 and 108, track width regulating grooves 55a, 55b, 56a and 56b are formed on the abutting surfaces to regulate the end faces of the magnetic metal films 107 and 108 on the abutting side. The track width Tw of the magnetic gap g formed between the end faces is also regulated. Then, the pair of magnetic core halves are joined to form a magnetic head. Also in the above magnetic head, a base film or the like may be provided as in the above magnetic head.

[0054]

As is apparent from the above description, a pair of magnetic metal thin films laminated with an insulating film sandwiching a laminated magnetic film between at least a pair of substrates made of a magnetic ferrite material in the thickness direction. In the magnetic head in which the magnetic core halves are joined and integrated so as to abut the laminated magnetic films to form a closed magnetic circuit, at least a magnetic metal film is formed on the end face of the laminated magnetic films on the abutting side, When the track width of the magnetic gap is Tw,
Since Tw ≦ 13 μm, high-density recording is achieved, and since the magnetic metal film is formed on the end surface of the laminated magnetic film on the abutting side, the gap portion, which is the end surface on the abutting side, is composed of only the magnetic metal film. The entire gap portion functions as a magnetic path. Therefore, the substantial reduction of the track width of the gap portion is suppressed, and the reproduction output is not reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head to which the present invention is applied.

2 is an enlarged cross-sectional view of a main part showing a sliding surface portion of a magnetic recording medium in the magnetic head of FIG.

3A to 3C show a method of manufacturing a magnetic head to which the present invention is applied in the order of steps, (a) is a perspective view showing a step of forming a laminated magnetic film on a ferrite substrate, and (b) is a laminated magnetic film portion. It is a principal part enlarged front view which shows.

FIG. 4 is an enlarged front view of an essential part showing a step of forming a glass film on a laminated magnetic film formed on a ferrite substrate.

FIG. 5 is an enlarged front view of an essential part showing a step of forming a glass film on a ferrite substrate.

FIG. 6A is a perspective view showing a step of joining a ferrite substrate on which a laminated magnetic film is formed and the other ferrite substrate, and FIG. 6B is an enlarged front view of an essential part showing the joined portion in an enlarged manner. Is.

FIG. 7 is a perspective view showing a step of cutting a laminated substrate which has been joined and integrated.

FIG. 8 is a perspective view showing a process of forming a winding groove and a glass groove in one magnetic core half block.

FIG. 9 is a perspective view showing a step of forming a winding groove and a glass groove in the other magnetic core half block.

FIG. 10 is a perspective view showing a step of forming a track width regulating groove in one magnetic core half block.

FIG. 11 is a perspective view showing a step of forming a track width regulating groove on the other magnetic core half block.

FIG. 12 is a perspective view showing a step of forming a magnetic metal film on one magnetic core half block.

FIG. 13 is a perspective view showing a step of forming a magnetic metal film on the other magnetic core half block.

FIG. 14 is an enlarged front view of an essential part showing a magnetic metal film portion.

FIG. 15 is a perspective view showing a pressure fusion process of magnetic core half blocks.

FIG. 16 is an enlarged plan view of a main part showing a sliding surface portion of a magnetic recording medium of another embodiment of the magnetic head to which the invention is applied.

[Explanation of symbols]

1, 2 ... Laminated magnetic film 1a, 1b, 1c, 2a, 2b, 2c ... Magnetic metal thin film 3, 4 ... First substrate 5, 6 ... Second substrate 7, 8 ... ..Magnetic core half body 9 ... Fused glass 101, 102 ... Magnetic metal film g ... Magnetic gap Tw ... Track width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshinori Watanabe 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (1)

[Claims] 1. A pair of magnetic core halves in which a laminated magnetic film formed by laminating magnetic metal thin films via an insulating film is sandwiched between a pair of substrates made of at least a magnetic ferrite material in the film thickness direction to form a laminated magnetic layer. In a magnetic head having a closed magnetic circuit that is joined and integrated so as to butt the films, a magnetic metal film is formed on at least the end face of the laminated magnetic film on the butt side, and the track width of the magnetic gap is Tw. And Tw ≦ 13 μm.