JP2959908B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head having a novel structure capable of reducing the size of a magnetic circuit, improving high-frequency response, and improving durability, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As signals recorded magnetically on a magnetic tape have become higher in density, a magnetic tape such as a metal tape having an excellent magnetic layer having a high residual magnetic flux density has been used. In a magnetic head applied to a magnetic tape having a high coercive force such as a metal tape, it is necessary to increase the magnetic field intensity generated by the magnetic gap. Further, as the density of signals to be recorded increases, it is necessary to further narrow the track width of the magnetic head.

Conventionally, a magnetic head A having a structure shown in FIG. 7 is known as a conventional example of a magnetic head provided to satisfy such a demand. This magnetic head A
Are formed by welding and integrating the magnetic core halves 1 and 1 with a bonding material such as glass. Each of the magnetic core halves 1 has a metal magnetic film 2 formed of a plate-shaped side core half 3 made of a non-magnetic material. 3 and are integrated. The metal magnetic film 2 is formed by laminating a metal magnetic thin film of a high magnetic permeability alloy together with an interlayer insulating layer by a film forming method such as sputtering, and the thickness of the metal magnetic film 2 is set to a value equal to the track width. I have. In addition,
The medium facing surface 4 of the magnetic head A is polished into a curved surface in consideration of resistance when sliding on a magnetic tape.

In the medium facing surface 4, a magnetic gap 5 is formed in a portion where the metal magnetic films 2 and 2 are joined with a gap layer made of a non-magnetic material interposed therebetween, and a magnetic core half 1 is formed. 1 is joined to the side of one of the magnetic core halves 1, and a winding window 6 is formed.

On the other hand, as another conventional example of a magnetic head provided to satisfy the above demand, a magnetic head B having a structure shown in FIGS. 8 and 9 is known. This magnetic head B
A convex portion 11a is formed on a side portion of a pair of ferrite magnetic core halves 11, and a metal magnetic film 14 and a gap layer 13 are formed so as to cover the convex portion 11a. 11 are abutted to each other via the gap layer 13 with the convex portions 11a, and the main gap G is provided between the gap layers 13 and 13.
Are formed, and the magnetic core halves 11, 11 are combined with the glass layers 15, 1
5 and the MIG (Metal I
n Gap) type magnetic head.

The MIG-type magnetic head B can generate a strong and steep magnetic field from the magnetic gap as compared with a ferrite head having a configuration in which the metal magnetic film 14 is not used. It is an excellent one that can cope with high density, and is widely used as a magnetic head for recording a video of a VTR or a magnetic head for a digital tape recorder.

Conventionally, to manufacture a magnetic head B having the above structure, first, a magnetic head B made of a magnetic material such as ferrite is used.
Prepare core blocks, apply groove processing to these core blocks to form a plurality of irregularities, and stack a metal magnetic film on the surface of these irregularities by a film forming method such as sputtering,
Then, a SiO 2 film is formed on the metal magnetic
_A gap layer including _two layers is formed.

Next, the core blocks on which the gap layers have been formed are butted together via the gap layers, and glass is poured so as to fill the recessed portions at the butted portions, and the core blocks are joined together. Then, the joined core blocks are cut into a plurality of magnetic cores, and each magnetic core is subjected to finish processing, thereby simultaneously manufacturing a plurality of magnetic heads from the pair of core blocks.

[0009]

In the conventional magnetic head A shown in FIG. 7, at the time of manufacturing, in addition to the step of joining the magnetic core halves 1 and 1 with a joining material such as glass, a side core half is used. In order to integrate the bodies 3 and 3 and the metal magnetic film 2, a step of joining them with an adhesive or the like must be performed, and there is a problem that the manufacturing process becomes complicated. In general, it is necessary to reduce the size of the magnetic circuit in order to make the magnetic head compatible with high frequencies. However, in the magnetic head A having the configuration shown in FIG. There is a problem that the magnetic circuit cannot be further reduced in size because the magnetic circuit is formed on the entire surface.

On the other hand, in the conventional magnetic head B shown in FIGS. 8 and 9, since the magnetic core half 11 made of ferrite is used, the magnetic characteristic of the ferrite material itself is limited. Since the magnetic characteristics of the magnetic head 14 are suppressed, there is a limit in supporting high frequencies, and since most of the magnetic core is occupied by ferrite material, there is a problem that the coil inductance of the magnetic head cannot be reduced.

Further, in the magnetic head having the structure shown in FIGS. 8 and 9, the parallel portion between the main gap G and the metal magnetic film 14 and the parallel portion between the main gap G and the gap layer 13 are long. In addition, since they are arranged on both sides of the main gap G, they form a pseudo gap, which causes a swell in the frequency dependence of the reproduced output, thus causing a so-called contour effect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it has been made possible to reduce the size of a magnetic circuit and facilitate high-frequency operation. The thickness of the gap does not change,
An object of the present invention is to provide a magnetic head capable of suppressing the contour effect.

[0013]

According to a first aspect of the present invention, in order to solve the above-mentioned problems, a pair of half cores made of a non-magnetic material is formed by interposing a metal magnetic film formed on a side portion thereof through a gap layer. In the magnetic head in which a magnetic gap is formed between the butted metal magnetic films to form a magnetic gap and one surface of the half core adjacent to the side surface of the half core is a medium facing surface, A groove is formed, the grooves of each half core are joined together, and a winding window is formed at a joint portion of the half core,
An annular metal magnetic film surrounding the winding window is formed around the winding window, and a part of the metal magnetic film around the groove of one half core and one of the metal magnetic films around the groove of the other half core are formed. Are opposed to each other on the medium facing surface side with a gap layer interposed therebetween, and the metal magnetic film has a laminated structure of a metal magnetic thin film and an interlayer insulating layer.
The metal magnetic films located on both sides of the
It is reaching the systemic facing surface, said metallic magnetic film and the interlayer insulating layer, is formed auxiliary magnetic film exposed to the air bearing surface across the gap layer from the thickness direction on both sides between the gap layer Things.

According to a second aspect of the present invention, in order to solve the above-mentioned problem, in the magnetic head according to the first aspect, the surface portion of the metal magnetic film exposed on the medium facing surface bulges toward the magnetic gap. The tip portions of the curved surface portions of the metal thin films of each half core are opposed to each other at the center of the magnetic gap.

[0015]

The annular magnetic circuit formed by the metal magnetic film is formed so as to surround the winding window formed at the junction of the non-magnetic half core, so that the magnetic circuit is smaller than the conventional structure. In addition, since recording and reproduction can be performed by the miniaturized magnetic circuit, recording and reproduction characteristics corresponding to high frequencies can be obtained. Furthermore, since recording and reproduction can be performed only with the metal magnetic film,
This is more advantageous than the conventional MIG-type magnetic head in which the presence of the ferrite portion limits the high frequency response. In addition, an auxiliary magnetic layer sandwiches both sides in the thickness direction of the gap layer, and a metal magnetic thin film and an interlayer insulating layer are laminated outside the auxiliary magnetic layer.
Sex film such is reached in the medium facing surface in an inclined state Runode, the thickness of the long time the magnetic recording medium sliding contact has been gap layer be worn bearing surface is somewhat auxiliary magnetic layer on both sides thereof regulatory It doesn't change. Therefore, even if the magnetic head is used for a long time, the thickness of the gap does not change, and the magnetic characteristics are not deteriorated, so that a magnetic head having excellent durability can be obtained.
On the other hand, since the surface of the metal magnetic film exposed on the medium facing surface is curved so as to swell toward the magnetic gap, the surface of the metal magnetic film is parallel to the magnetic gap at only one point, The other portions are sequentially separated from the magnetic gap, so that no pseudo gap is formed. Therefore, no contour effect is produced.

[0016]

【Example】

(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show the structure of a first embodiment of a magnetic head according to the present invention. In a magnetic head C of this embodiment, a pair of left and right magnetic core halves 20, 20 are arranged on their side surfaces. The upper surfaces of the magnetic core halves 20, 20 in FIG. The magnetic core half 20 includes a substantially rectangular plate-shaped half core 23 made of a nonmagnetic material such as crystallized glass or ceramics.
And a metal magnetic film 24 formed on the side of the half core 23.

A groove 25 is formed in a side surface to which the half cores 23 are joined, respectively.
Consists of a bottom surface 25a parallel to the side surface of the half core 23 and inner surfaces 25b, 25b inclined with respect to the bottom surface 25a. One of the two inner surfaces 25b reaches the medium facing surface 22 in an inclined state. Have been. On the side surface of the half core 23, except for the groove 25, a convex portion 23a whose surface is curved in an arc shape is formed so as to bulge toward the other half core 23 facing the other half core.

A soft magnetic alloy thin film having a high magnetic permeability and a high saturation magnetic flux density is provided on the entire side portion of the half core 23, that is, on the side surface of the half core 23, the bottom surface 25a of the groove portion 25, and the inner side surface 25b of the groove portion 25. Metal magnetic film 24 made of, for example,
Are formed. As shown in FIG. 3, the metal magnetic film 24 is formed by laminating a plurality of metal magnetic thin films 24a individually via an interlayer insulating layer 24b.

The soft magnetic material forming the metal magnetic film 24 is made of Fe-Al-S having a saturation magnetic flux density of 10,000 G or more.
A soft magnetic material having a higher saturation magnetic flux density than commonly known ferrite, such as a soft magnetic alloy such as an i-based alloy Sendust, a Fe-Al-Ta-C-based soft alloy, an Fe-based or Co-based amorphous alloy, may be used as appropriate. .

As a material for forming the metal magnetic thin film, a Fe—Ta—C system, an Fe—MO system (M represents at least one of Zr and Hf), a Fe—Co—
MO-based, Fe-Co-M-OX-based soft magnetic thin films and the like can be used. Among these soft magnetic thin films, preferably, the applicant of the present invention firstly filed Japanese Patent Application No. 2-168051.
Patent applications in the specification and Japanese Patent Application No. Hei 3-315036 are used. The composition range of these soft magnetic thin films is preferably Fe _50-96 M ' _2-30 C
_0.5-25 (M 'is Ti, Zr, Hf, Nb, Ta, M
at least one of o and W. ), Fe _70-96 M
_{1-12 O 3-25, Fe 13-86 Co 10-50} M 1-12 O 3-2 5, Fe
_13-85 Co _10-50 M _1-12 O _3-25 X _{0.1-26 and the} like, but it goes without saying that materials other than these compositions may be used.
(In the above formula, the Fe _{70-9 6,} shows that the Fe content is 70% ≦ Fe ≦ 96% in atomic percent.)

As shown in FIG. 3, between the metal magnetic films 24 of the pair of magnetic core halves 23, SiO ₂ ,
A gap layer 26 made of a non-magnetic layer such as Al ₂ O ₃ or CrSiO ₂ is formed to form a magnetic gap G, and the thickness of the gap layer 26 is provided between each metal magnetic thin film 24 and the gap layer 26. The auxiliary magnetic layer 27 is interposed on both sides in the vertical direction. The auxiliary magnetic layer 27 is formed of a soft magnetic material equivalent to the metal magnetic thin film 24a, and sandwiches the gap layer 26 from the upper end on the medium facing surface side to the lower end of the gap layer 26. It is formed from the lower end to the lower surface of the lowermost metal magnetic thin film 24a shown in FIG.

The surface of each metal magnetic film 24 exposed on the medium facing surface 22 is curved in an arcuate shape so as to bulge toward the magnetic gap G side, and the curvature formed by each metal magnetic film 24, 24 is formed. The tip of the portion is closest to the magnetic gap G. The tip of the metal magnetic film 24 curved toward the magnetic gap is closest to the magnetic gap G at the center of the magnetic gap G.

On the other hand, a hexagonal winding window 19 is formed at the joint on the side of the half cores 23, 23 by abutting the grooves 25, 25. Glass is filled to form a glass part 21.

As shown in FIG. 2, a joining groove 23b formed between the projections 23a of the half cores 23, 23 is formed at both ends in the thickness direction at the joining portion of the half cores 23, 23. Then, glass is filled in the joining groove 23b to form a glass part 28. A winding groove 29 is formed at both sides of the magnetic head C shown in FIG. 1 at a position corresponding to the height of the winding window 19. And the winding coil is provided through the other winding groove 29 and the other end of the winding window 19.

In the magnetic head C having the above structure, for example, the gap depth Gd is about 3 to 30 μm, the thickness of the interlayer insulating layer is about 0.01 to 0.1 μm, and the metal magnetic thin film 24 a
Is about 5 to 30 μm, and the thickness of the gap layer is 0.1.
The thickness of the auxiliary magnetic layer 27 can be set to about 2 to 10 μm.

The magnetic head C having the above-described configuration is used to perform magnetic recording and reproduction on a magnetic recording medium such as a magnetic tape, like the conventional magnetic head. In order to do so, the winding coil provided on the magnetic head C may be energized to form a magnetic flux gradient outside the magnetic gap G, thereby magnetizing a desired portion of the magnetic recording medium. in this case,
Since the metal magnetic thin film 24a having a high magnetic permeability and a high saturation magnetic flux density generates a steep magnetic field outside the magnetic gap G, even a magnetic recording medium having a magnetic layer with a high coercive force can perform magnetic recording with a margin. It is possible to cope with high density of magnetic recording. Also, compared to a conventional MIG type magnetic head using a ferrite portion and a metal magnetic thin film, the absence of the ferrite portion is advantageous for high-frequency magnetic recording.

Further, since the metal magnetic films 24 formed along the groove 25 form an annular magnetic circuit surrounding the periphery of the winding window 26, the magnetic head A having the conventional structure shown in FIG. Alternatively, the MI of the conventional structure shown in FIGS.
The magnetic circuit can be reduced in size as compared with the G-type magnetic head B. Therefore, the magnetic head has a feature that is more advantageous for a high frequency than the conventional magnetic head, and the magnetic information recorded on the magnetic recording medium can be easily read and the reproduction efficiency can be improved by downsizing the magnetic circuit. Further, the metal magnetic films 24, 24 provided around the winding window 26
And approaching each other while being inclined toward. Therefore, the shape is advantageous for generating a magnetic field in the magnetic gap G.

Further, if the auxiliary magnetic layers 27 sandwiching both sides of the gap layer 26 are formed, the magnetic tape G is slid on the medium facing surface 22 for a long time, and even if the medium facing surface 22 is worn, the magnetic gap G is reduced. There is an advantage that the width does not change. That is, in consideration of the case where the auxiliary magnetic layer 27 is not provided, as the medium facing surface 22 wears, when the leading end of the interlayer insulating layer 24b is exposed to the medium facing surface 22, the exposed interlayer insulating layer 24b is used. The thickness of the gap layer 26 will be different. However, if the auxiliary magnetic layer 27 is provided on both sides in the thickness direction of the gap layer 26, the auxiliary magnetic layer 27 regulates the thickness of the gap even if the interlayer insulating layer 24b is exposed.
The thickness of the gap is kept constant. Therefore, the magnetic head C having the above-mentioned structure does not change the gap thickness even when used for a long time, enables stable magnetic recording, and does not cause deterioration in characteristics.

On the other hand, in the magnetic head C having the above structure, the metal magnetic film 24 exposed on the medium facing surface 22
24 are individually curved and approach the magnetic gap G, approach the closest at one point, and are gradually separated from the magnetic gap G at the other portions.
In FIGS. 4 and 24, unlike the conventional magnetic head B shown in FIGS. 8 and 9, there is no metal magnetic film portion arranged in parallel with the magnetic gap. There is no occurrence of distortion.

In the above embodiment, the metal magnetic film 24 is formed to be curved in an arc shape. However, the metal magnetic film 24 may be formed to be curved in an arc shape on the medium facing surface 22. Half cores 23, 2
3 has a magnetic gap G
The contour effect can be suppressed if the metal magnetic film 24 is closest to each other at the center portion of the metal film 24 and is gradually separated from the magnetic gap G at the other portions, so that the curved state of the metal magnetic film 24 can take various shapes. Therefore, the term “the metal magnetic film 24 is curved” in the present invention includes a state in which a plurality of planar metal magnetic films are connected while being inclined at a small angle and are curved as a whole.

(Second Embodiment) FIGS. 4 to 6 show the sectional structure of a second embodiment of the magnetic head according to the present invention. The magnetic head D of this embodiment has a pair of left and right magnetic core halves. The bodies 30, 30 have their glass parts 3
The upper surface side of the magnetic core halves 30, 30 in FIG. 1 is a medium facing surface 32. The magnetic core half 30 includes a substantially rectangular plate-shaped half core 33 made of a non-magnetic material,
3 and a metal magnetic film 34 formed on the side of the side 3.

A groove 35 is formed in a side surface to which the half cores 23 are joined, respectively.
Consists of a bottom surface 35a parallel to the side surface of the half core 33 and inner side surfaces 35b, 35b inclined with respect to the bottom surface. One of the two inner side surfaces 35b reaches the medium facing surface 32 in an inclined state. ing.

On the bottom surface 35a of the groove 35 and on the inner surface 35
b, a plurality of metal magnetic thin films 34a made of a soft magnetic alloy thin film having a high magnetic permeability and a high saturation magnetic flux density are individually stacked via an interlayer insulating layer 34b.
And the interlayer insulating layers 34b form a metal magnetic film 34. The soft magnetic material forming the metal magnetic thin film 34a is made of the same material as the soft magnetic material forming the metal magnetic thin film 24a of the first embodiment.

The metal magnetic film 3 of the magnetic core half 30
4, the metal magnetic thin film 3 closest to the half core 33
4a is exposed on the medium facing surface 32, and as shown in FIG. 3, the metal magnetic films 34 of the pair of half cores 33, 33,
A gap layer 36 made of a nonmagnetic layer of SiO ₂ , Al ₂ O ₃ , CrSiO ₂ or the like is formed between the metal magnetic thin films 34 on the medium facing surface 22 side. An auxiliary magnetic layer 37 is interposed between the gap layer 36 and the gap layer 36 so as to sandwich both sides in the thickness direction of the gap layer 36. The auxiliary magnetic layer 37 is formed of a soft magnetic material equivalent to the metal magnetic thin film 34a, and sandwiches the gap layer 36 from the upper end on the medium facing surface side to the lower end of the gap layer 36. It is formed from the lower end to the lower surface of the lowermost metal magnetic thin film 34a shown in FIG. Further, the half cores 33, 33 are integrated, and a hexagonal winding window 40 is formed at the junction of the half cores 33, 33.

On the other hand, as shown in FIG.
At the both ends in the thickness direction at the joining portions of the half cores 3 and 33, the joining grooves 3 formed by cutting out the end portions of the half cores 33 and 33 are formed.
3b is formed, and glass is also filled in the joining groove 23b to form a glass portion 38. Also, between the joining grooves 33b, 33b, and on the side surface of the half core 33, a convex portion 33 sandwiched between the joining grooves 33a, 33a is provided.
a is formed.

On both sides of the magnetic head D shown in FIG. 4, a winding groove 39 is formed at a height position corresponding to the winding window 40. The winding coil is provided so as to be provided via one end side, and the winding coil is provided via the other winding groove 39 and the other end side of the winding window 40.

The magnetic head D having the structure shown in FIGS. 4 to 6 does not have the effect of suppressing the contour effect.
Other effects can be obtained similarly to the magnetic head C of the first embodiment. In particular, the effects of high frequency compatibility, miniaturization of the magnetic circuit, high recording density, and the effect that the thickness of the gap layer 36 does not change even when the magnetic recording medium slides are the same as those of the magnetic head C of the previous embodiment. is there.

In the magnetic head D of this embodiment, the metal magnetic film 34 is provided only around the winding window 40,
Although the configuration in which a metal magnetic film is not provided on a portion other than the periphery of the winding window 40 on the joined side surfaces of the half cores 33, 33 is adopted, the winding window is formed on the joined side surface of the half cores 33, 33. It is a matter of course that the metal magnetic film 34 may be provided in a portion other than the periphery of the metal 40. Also,
In the magnetic head C of the first embodiment, the half core 2
Although the metal magnetic film 24 is provided also on a portion other than the periphery of the winding window 19 on the side surface where the windings 3 and 23 are joined, the metal magnetic film 34 in this portion may be omitted.

If the structures of the magnetic heads C and D of the first and second embodiments are adopted, a non-magnetic half core is manufactured from the core block, and the manufactured half core is grooved. A metal magnetic thin film is formed in the groove by means such as sputtering, and the half core joint surface is polished,
After forming the auxiliary magnetic layer, the magnetic cores C and D can be manufactured by joining the pair of half cores with glass and polishing the half cores to form the medium facing surface. Therefore, the magnetic head of the present invention can be manufactured by the same procedure and equipment as the conventional magnetic head.

[0040]

As described above, according to the present invention, a metal magnetic film is formed so as to surround a winding window formed at a junction of a half core made of a non-magnetic material, and the metal magnetic thin film forms an annular shape. Since the magnetic circuit is formed, the size of the magnetic circuit can be reduced as compared with a magnetic head having a conventional structure in which a metal magnetic thin film is formed on the entire side surface of the half core, and the size of the magnetic head can be reduced. Further, since recording and reproduction can be performed by the miniaturized magnetic circuit, recording and reproduction characteristics corresponding to a higher frequency than those of the conventional magnetic head can be obtained.

Further, an auxiliary magnetic layer sandwiches both sides in the thickness direction of the gap layer, and a metal magnetic thin film and an interlayer insulating layer are laminated outside the auxiliary magnetic layer.
The layered metal magnetic film reaches the medium facing surface in an inclined state
Since each auxiliary magnetic layer is continuous with the metal magnetic thin film, the magnetic head of the structure according to the present invention does not change the thickness of the gap even when used for a long time, and provides stable magnetic recording. And no deterioration of characteristics occurs. Furthermore, since magnetic recording / reproducing can be performed only by a magnetic circuit using a metal magnetic film, it is more advantageous than a conventional MIG type magnetic head in which the presence of a ferrite portion has a limit in high frequency operation.

On the other hand, in the magnetic head according to the second aspect, the surface portion of the metal magnetic film exposed on the medium facing surface is individually curved and approaches the magnetic gap, approaches the magnetic gap at one point, and the other. Since the part is gradually separated from the magnetic gap, in the metal magnetic film of this configuration, unlike the conventional magnetic head, there is no metal magnetic film part arranged in parallel with the magnetic gap. It does not occur, and the phenomenon of generating waveform distortion due to the contour effect does not occur.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnetic head according to a first embodiment of the present invention.

FIG. 2 is a plan view of the magnetic head shown in FIG.

FIG. 3 is an enlarged sectional view of a main part of the magnetic head shown in FIG. 1;

FIG. 4 is a sectional view of a magnetic head according to a second embodiment of the present invention.

FIG. 5 is a plan view of the magnetic head shown in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part of the magnetic head shown in FIG. 4;

FIG. 7 is a perspective view showing an example of a structure of a conventional magnetic head.

FIG. 8 is a perspective view showing one structural example of a conventional MIG type magnetic head.

FIG. 9 is a plan view of the magnetic head shown in FIG. 8;

[Explanation of symbols]

 C, D magnetic head, G gap, 20, 30 magnetic core half, 21, 28, 31, 38 glass part, 22, 32 medium facing surface, 23, 33 half core, 23a, 33a protrusion, 24, 34 metal magnetism Film, 25a, 35a window, 24a, 34a metal magnetic thin film, 24b, 34b interlayer insulating layer, 19, 40 winding window, 26, 36 gap layer, 27, 37 auxiliary magnetic layer,

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-92908 (JP, A) JP-A-4-159603 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) G11B 5/127-2/255

Claims (2)

(57) [Claims] 1. A pair of half cores made of a non-magnetic material,
The metal magnetic films formed on their side portions are abutted through a gap layer to form a magnetic gap between the metal magnetic films and are integrated, and one surface of the half core adjacent to the side surface of the half core is a medium. in the magnetic head formed by the opposing surfaces, the grooves on the side surface of each half-core is formed, the windings window junction of the groove to each other are being combined can butt half core of each half-core is formed, around the winding window An annular metal magnetic film surrounding the winding window is formed, and a part of the metal magnetic film around the groove of one half core and a part of the metal magnetic film around the groove of the other half core are interposed via the gap layer. while being opposed bearing surface side, the metal magnetic film is in the laminated structure of the thin magnetic metal film and the interlayer insulating layer, wherein the formic
Metal magnetic films located on both sides of the gap layer
The gap also reaches the medium facing surface in an inclined state, and the gap is sandwiched between the metal magnetic thin film and the interlayer insulating layer and the gap layer from both sides in the thickness direction of the gap, and the medium facing surface. A magnetic head comprising an auxiliary magnetic film that is exposed. 2. The magnetic head according to claim 1, wherein the surface of the metal magnetic film exposed at the medium facing surface is curved so as to bulge toward the magnetic gap, and the metal thin film of each half core is curved. A magnetic head characterized in that the tips of the surface portions are opposed to each other at the center of the magnetic gap.