JPH0845015A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a good traveling characteristic even on a magnetic tape having a very smooth surface and also to obtain good contact with the tape. CONSTITUTION:Projecting and recessed parts of a height of H=2-50nm are provided at intervals of Ph<=2mum on a tape sliding surface 1 of the magnetic head at least in the vicinity of a head gap 3. Alternatively, the tape sliding surface 1 is constituted of a polycrystallo-magnetic material of a crystal grain diameter of L<=2mum. By this method, a friction coefft. between the head and the tape is reduced by the projecting and recessed parts of the tape sliding surface, and also if the height is H<=50nm, deterioration of a level of a reproducing output due to spacing loss does not take place. Consequently, the good tape traveling characteristic even on the magnetic tape having a very smooth surface is obtained, and also good contact with the tape can thus be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus, and more particularly to a magnetic head suitable for a magnetic recording medium such as a vapor deposition tape having excellent surface smoothness.

[0002]

2. Description of the Related Art Generally, in a VTR, a relative speed between a magnetic head mounted on a rotary cylinder and a magnetic tape is set high in order to record and reproduce a wide band signal. for that reason,
It is necessary to bring the magnetic head into good contact with the magnetic tape, and the spacing (gap between the magnetic head and the tape)
If such a phenomenon occurs, the recording / reproducing characteristics of the magnetic head will be impaired. In order to suppress such an inconvenience and obtain good recording / reproducing characteristics, the shape of the magnetic head in contact with the magnetic tape (hereinafter referred to as the tape sliding surface shape of the magnetic head)
Is important.

The shape of the tape sliding surface of a conventional magnetic head will be described with reference to FIG. FIG. 7 is a schematic plan view showing the shape of a tape sliding surface of a conventional magnetic head. In the figure, a pair of ferrite core halves 5 and 5'is formed with a non-magnetic film (not shown) on the abutting surface of each core so as to obtain a predetermined magnetic gap length, and the magnetic gap 3 is regulated. are doing. Further, the notch 2 is provided in the ferrite core halves 5 and 5'to regulate the track width Tw perpendicular to the head scanning direction, and the notch 2 is filled with glass for joining the ferrite core. are doing. In order to obtain a good tape contact, the radius of curvature in the head scanning direction is R on the tape sliding surface 1 of the magnetic head.
Shape processing (hereinafter referred to as R shape processing).

Generally, this R shape processing is performed by a grinding machine,
Alternatively, it is performed using a polishing tape. in this way,
By performing R-shape processing on the tape sliding surface in the head scanning direction, the deformation of the magnetic tape near the tape sliding surface becomes substantially the same as the tape sliding surface shape. Further, there has been proposed a structure in which a groove 9 for generating a negative pressure is provided in a part of a tape sliding surface of a magnetic head along a direction orthogonal or inclined to the sliding direction. With this configuration, the magnetic tape is attracted to the sliding surface 1 of the magnetic head by the negative pressure generated in the groove 9 when the magnetic tape slides. Therefore, good contact with the magnetic tape can be obtained, and a magnetic head having a small spacing loss and excellent recording / reproducing characteristics can be obtained.

Incidentally, as for the good contact with such a magnetic tape, for example, JP-A-62-20441
No. 3 publication is cited.

[0006]

Due to the sliding surface shape of the magnetic head as described above, spacing loss can be suppressed and good contact with the magnetic tape can be obtained. However, in the conventional magnetic head, only the head structure for reducing the spacing loss is used, and no consideration is given to the influence of the friction between the magnetic head and the magnetic tape on the tape contact due to the friction between the tapes. .

At present, along with the miniaturization and high density recording of the magnetic recording / reproducing apparatus, the magnetic tape as a recording medium has been made thinner,
And the smoothing of the magnetic tape surface is progressing. For example, the tape thickness of the oxide tape used in household VHS VTRs and S-VHS VTRs is 14 to 20 μm, and the surface roughness (irregularities on the magnetic surface side of the magnetic tape that is the sliding surface side with the magnetic head). ) Is 40 to 80 nm. On the other hand, the vapor deposition tape used in the subsequently developed 8 mm standard VTR and high band 8 mm standard VTR has a tape thickness of 8 to 10 μm and a surface roughness of
It is 10 to 20 nm.

When such a vapor-deposited tape having extremely good surface smoothness is scanned by the conventional magnetic head, the contact area between the magnetic head and the magnetic tape is widened and the friction coefficient is increased. As a result, there is a problem that a tape running defect occurs due to an increase in the load on the head due to the tape, resulting in damage to the magnetic head and the magnetic tape.

Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, to obtain a good tape running characteristic even for a magnetic tape having an extremely good surface smoothness, and to obtain a good tape contact. The present invention is to provide a magnetic head.

[0010]

In order to solve the above-mentioned problems, the present invention provides a method of ion etching, chemical etching, or the like, in at least a portion of a sliding surface of a magnetic head with a magnetic tape, which is in contact with the tape. Predetermined height H
And a space P (a space between the concave portions and the concave portions, or a distance between the convex portions and the convex portions) is provided. Alternatively, even if the magnetic head is worn by the magnetic tape, the sliding surface with the magnetic tape is formed of a polycrystalline magnetic material having a specific grain size L so that irregularities are always provided on the tape sliding surface.

However, as a practically preferable condition, when the interval P of the unevenness is larger than P = 2 μm, the friction coefficient between the head and the tape does not change.
Therefore, the interval P between the irregularities is set to 2 μm or less. Preferably, P = 2 to 0.1 μm. Even if it is smaller than P = 0.1 μm, the effect of reducing the number of frictional systems is theoretically recognized, but the above range is practical from the viewpoint of processing problems.

When the height H of the unevenness is less than 2 nm, the friction coefficient between the head and the tape remains large,
If it is greater than 50 nm, spacing loss increases, good tape contact cannot be obtained, and reproduction output decreases.
Further, when the crystal grain size L of the polycrystalline magnetic material is larger than 2 μm, the interval P of the irregularities does not become smaller than 2 μm, and when the crystal grain size L is smaller than 0.1 μm, the height H of the irregularities.
Becomes smaller than 2 nm. 2 nm ≤
H ≦ 50 nm, 0.1 μm ≦ L ≦ 2 μ
It is desirable to set m.

Further, when the sliding surface with the magnetic tape is formed of a polycrystalline magnetic material, unevenness (so-called chipping) due to crystal grains is formed at the magnetic head end of the sliding surface of the magnetic tape in a direction perpendicular to the head scanning direction. Occurs. When the inclination angle θ inside the end of the magnetic head is 90 degrees or less, this chipping becomes remarkable and the magnetic tape is damaged when the magnetic tape runs.
Therefore, it is practically preferable to set the inclination angle θ inside the end portion of the magnetic head in the direction perpendicular to the head scanning direction of the magnetic tape sliding surface to 90 ° <θ <180 °.

At this time, the magnetic head is not particularly limited, such that the main magnetic circuit is made of a metal magnetic film or a ferrite material having a high magnetic permeability. However, desirably, in order to improve the recording / reproducing characteristics, a metal magnetic film is formed on a portion of at least one of the pair of magnetic substrate materials (magnetic core halves) made of a ferrite material, which is in contact with the magnetic gap. Further, since the saturation magnetic flux density of the ferrite material and large, the composition of the ferrite material Fe ₂ O _3: 40~60 mol%, ZnO: 5 to 20 mol%, the balance and MnO.

Width W of sliding surface between magnetic head and magnetic tape
When W is less than 50 μm, the strength of the sliding surface of the magnetic head with respect to the magnetic tape is weakened, and the head is damaged due to dust or the like during the tape running. Conversely, W =
If it is larger than 100 μm, it is advantageous in terms of wear life, but according to studies, there is a problem that good tape contact cannot be obtained due to the difference in rigidity of the magnetic tape. For practical reasons, it is preferably 50 μm ≤ W
≦ 100 μm.

Further, the sliding surface of the magnetic head with respect to the magnetic tape is processed so as to have an arcuate shape having a radius of curvature Rx in the head scanning direction side. However, if the radius of curvature R is smaller than R = 3 mm, the wear life becomes extremely short, and conversely R =
If it is larger than 15 mm, the spacing loss between the magnetic head and the magnetic tape increases and it becomes difficult to obtain good recording and reproducing characteristics. 3 mm ≤ Rx due to reasons such as
It is desirable that ≦ 15 mm.

Similarly, processing is performed so as to form an arc shape having a radius of curvature Ry also in the direction perpendicular to the head scanning direction. However,
It is desirable that 1 mm ≤ Ry ≤ 4 mm.

[0018]

The function of the unevenness of the tape sliding surface of the magnetic head of the present invention will be described with reference to FIG. This figure is a characteristic diagram showing the relationship between the height of the unevenness of the tape sliding surface of the magnetic head and the friction coefficient and the reproduction output when a commercially available vapor deposition tape is used.

That is, on the tape sliding surface of the magnetic head,
Concavities and convexities with an interval P = 1 μm are provided by, for example, ion etching. The friction coefficient between the magnetic head and the magnetic tape when the height H of the unevenness is changed, and the single frequency when the relative speed between the head and the tape is set to 5.8 m / s corresponding to VHS-VTR. It is a characteristic view which shows the change of the reproduction output level of the signal of 5 MHz.

According to the figure, as the height H of the irregularities on the tape sliding surface of the magnetic head is increased, both the friction coefficient and the reproduction output become smaller. This friction coefficient decreases as the height H increases, and the contact area between the sliding surface of the magnetic head and the magnetic tape decreases. On the other hand, when the contact area is wide and the friction coefficient is large, the load on the magnetic head from the magnetic tape becomes large, and the magnetic head is damaged.

Further, the increase of the load on the magnetic head directly increases the tape load on the rotary cylinder, which causes uneven rotation of the rotary cylinder. Then, due to the uneven rotation, the video signal is recorded / reproduced with a time base fluctuation (so-called jitter) included.

Such deterioration of the tape running characteristics can be reduced as the friction coefficient between the magnetic head and the magnetic tape is smaller, that is, as the height H of the unevenness is larger, but substantially when the friction coefficient is 0.4 or less. Examination revealed that there was no problem.

Further, as the height H of the irregularities on the tape sliding surface of the magnetic head is increased, the vibration of the magnetic tape due to the scanning of the magnetic head becomes remarkable. Along with this, the spacing between the magnetic head and the magnetic tape also increases, and as a result,
The output level of the reproduction signal decreases. Regarding the reproduction output, the smaller the height H of the unevenness is, the better, but the reduction to about −2 dB does not affect the reproduction image quality at all.

Therefore, the height H of the irregularities on the tape sliding surface of the magnetic head is set to be 2 nm or more and 50 nm or less. As a result, it is possible to reduce the friction between the magnetic head and the magnetic tape without lowering the reproduction output level, and to obtain a magnetic head in which tape running and tape contact are good even with a magnetic tape having good surface smoothness. Is possible.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic head according to the present invention will be described in more detail below with reference to the embodiments shown in the drawings.

<Embodiment 1> FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention. For example, a magnetic head having a metal magnetic film shown in FIG.

FIG. 2 is a front view seen from the sliding surface side of the magnetic tape, 2 is a protective and adhesive agent, 3 is a magnetic gap (operating gap), 5, 5'magnetic substrate material, and 6 is a metal magnetic film. ,
Reference numeral 7 is a protrusion of the core base, and 8A and 8B are paired core halves.

Each of the core halves 8A, 8B is a magnetic substrate material 5, 5'made of a ferrite material, a magnetic substrate material 5, respectively.
The metal magnetic film 6 is attached and formed on the 5'butting surface side. In this example, Fe ₂ O ₃ : 55 mol% and Zn were used as the magnetic substrate materials 5 and 5 ′ having a composition with a high saturation magnetic flux density.
A single crystal ferrite containing O: 15 mol% and MnO: 30 mol% is used.

A protrusion 7 having a substantially chevron shape is formed by machining on the abutting surface side of each of the magnetic substrate members 5 and 5 '. In addition, the substantially chevron shape referred to in the present invention indicates a projection that gradually tapers toward the tip. In the example of FIG. 2, it is an inverted V-shaped sharp-edged chevron projection. A flat shape is also included in this. This protrusion 7
The metal magnetic film 6 is formed to have a predetermined film thickness on the formation surface side by the vacuum thin film forming technique, and the metal magnetic film 6 has a flat portion defining the track width Tw at the top of the protrusion 7. Has become.

Then, the flat portions of the metal magnetic film 6 are butted against each other via a gap regulating film (non-magnetic thin film) to form a magnetic gap 3 and the core is formed by a protective material 2 such as low melting point glass. It has a structure in which the half bodies 8A and 8B are joined and integrated. A winding window 4 is formed on at least one of the core halves 8A and 8B as shown in the perspective view of FIG. 1, and a coil is wound using this winding window. .

As shown in FIG. 1, the magnetic head having a main magnetic circuit made of such a metal magnetic film contacts the magnetic tape on the sliding surface 1 to record / reproduce information signals. The width W of the sliding surface 1 is set to, for example, 70 μm so that good tape contact can be obtained. As shown in FIG. 1, the sliding surface 1 of the magnetic head with respect to the magnetic tape is processed to have an arc shape with a radius of curvature Rx on the head scanning direction side. This is because the deformation of the magnetic tape near the tape sliding surface becomes substantially the same as the shape of the tape sliding surface, and good tape contact is obtained. The radius of curvature Rx affects the wear characteristics and the recording / reproducing characteristics, and is set to, for example, Rx = 10 mm in this embodiment.

As shown in FIG. 1, this arc-shaped processing is also performed in a direction perpendicular to the head scanning direction so that good tape contact can be obtained. The radius of curvature Ry is processed so that Ry = 2 mm, for example.

Further, in the tape sliding surface 1 of the core halves 8A and 8B of the magnetic head, a portion which actually abuts the tape is provided with an uneven portion 11 as shown in FIG. FIG.
FIG. 4 is a plan view schematically showing the unevenness provided on the tape sliding surface of the magnetic head in the present embodiment.

In this embodiment, a photoresist having a thickness of 300 nm is applied to a portion 11 of the sliding surface 1 of the single crystal ferrite head which is actually in contact with the tape, and the photomask shown in FIG. Was used to expose the photoresist. Light passes through the white part of the photomask in the figure,
The photoresist is hardened, but the light is blocked at the hatched portions, so the photoresist is not hardened.

After the exposure of the photoresist, the magnetic head was put in a developing solution to remove a portion where the photoresist was not cured, thereby forming a photoresist having an interval P = 1 μm on the tape sliding surface of the ferrite head. To be done.
Using this photoresist as a mask, ion etching using argon gas was performed. Then, the sliding surface of the single crystal ferrite head where there is no photoresist is
Etch by 0 nm. At this time, the tape sliding surface of the portion where the photoresist is present is not etched.

By this treatment, the height H = 10 on the tape sliding surface 1 of the magnetic head of this embodiment, as shown in FIG.
Concavities and convexities with a pitch of nm and an interval P of 1 μm are provided. Since this ion etching is completed in a few seconds, the magnetic head of this embodiment does not impair mass productivity.

Then, using a commercially available vapor deposition tape, the relationship between the height H of the unevenness of the sliding surface of the magnetic head and the friction coefficient and the reproduction output was measured. However, the relative speed between the head and tape is VH
S-VTR equivalent 5.8m / s, recording signal is 5M
A single frequency signal of Hz was used. As a result, it was possible to obtain a magnetic head in which the coefficient of friction between the magnetic head and the vapor deposition tape was as small as about 0.28 and the reproduction output was hardly reduced.

Therefore, like the magnetic head of this embodiment,
By providing irregularities on the tape sliding surface 1 of the head, good running characteristics can be obtained without impairing the reproduction output even for a magnetic tape having an extremely smooth surface such as a vapor deposition tape.

<Embodiment 2> Further, the embodiment described above is
The width W of the magnetic tape sliding surface in the head scanning direction is shown to be the same as the width of the magnetic substrate materials 5 and 5'in the direction perpendicular to the head scanning direction. However, the present invention is not limited to this, and for example, as shown in FIG. 5, the magnetic tape sliding surface in the head scanning direction with respect to the width of the magnetic substrate material 5, 5 ′ in the direction perpendicular to the head scanning direction. It is also applicable to a magnetic head whose width W is narrowed (narrow track portion 10). That is, the width W of the magnetic tape sliding surface in the head scanning direction is the same as that in the first embodiment due to the narrow track.
= 70 μm.

Then, on the tape sliding surface 1 of the magnetic head where the tape is actually abutted, a portion having a height H of 10 nm and an interval P of 1 μm is provided by ion etching. As a result, it was possible to obtain a friction coefficient having substantially the same value as in Example 1 without causing a reduction in reproduction output. Therefore, as in Example 1, it was possible to obtain the effect that good running characteristics could be obtained without impairing the reproduction output, even for a magnetic tape having extremely good surface smoothness.

In the magnetic head of this embodiment, due to the narrower track, the cross-sectional area of the magnetic substrate material 5, 5'becomes wider than that of the first embodiment, and the magnetic flux passing through the magnetic substrate material 5, 5 '. Will increase. On the other hand, due to the narrowed track, the cross-sectional area near the tape sliding surface is narrowed, and the magnetic flux density in this portion increases. Therefore, the recording magnetic field is increased by the increase of the magnetic flux density (so-called squeezing effect), and the effect of improving the recording characteristics can be obtained.

<Embodiment 3> The embodiment described above is
Although the magnetic head using single crystal ferrite as the magnetic substrate materials 5 and 5'is shown, the present invention is not limited to this. For example, the present invention can be applied to the magnetic head using the polycrystalline ferrite shown in FIG.

FIG. 11 is a perspective view showing a magnetic head using polycrystalline ferrite. In this example, Fe ₂ O ₃ : 5
5 mol%, ZnO: 15 mol%, MnO: 30 mol%
Mixed at a ratio of 1000 ° C., calcined at 1000 ° C. for 3 hours,
Grinding with a ball mill was performed for 6 hours. After that, high temperature high pressure (1400 ° C., 1000 kg / cm ² ) firing is performed,
Polycrystalline ferrite having a crystal grain size of 1 μm was obtained.

Further, as in the second embodiment, the width W of the sliding surface of the magnetic tape is made narrower (narrow track portion 10). However, chipping due to crystal grains occurs at the end of the magnetic head in the direction perpendicular to the head scanning direction on the sliding surface of the magnetic tape. Therefore, in order to reduce the damage of the magnetic tape due to the chipping, as shown in FIG. 6, the inclination angle θ inside the magnetic head end of the magnetic tape sliding surface in the direction perpendicular to the head scanning direction is 135 degrees. .

Then, as shown in FIG. 3, the tape sliding surface 1 of the magnetic head was ion-etched with irregularities having a height H = 10 nm and an interval P = 1 μm by the same processing method as in the first embodiment. Provided by. As a result, it was possible to obtain a friction coefficient having substantially the same value as in Examples 1 and 2 without causing a reduction in reproduction output. Therefore, as in the first and second embodiments,
It is possible to obtain good running characteristics for a magnetic tape with extremely good surface smoothness without impairing the reproduction output.
I was able to obtain the effect.

Further, in the magnetic head of this embodiment, polycrystalline ferrite having a crystal grain size of 1 μm is used as the magnetic substrate materials 5 and 5 '. Therefore, even when the tape sliding surface of the magnetic head is worn out, the polycrystal grains cause unevenness on the tape sliding surface, and the height H and the interval P are maintained at approximately the initial set values. .

Therefore, in this embodiment, since the unevenness is always present on the sliding surface of the tape irrespective of the running time of the tape, the magnetic tape having extremely good surface smoothness does not always impair the reproduction output. It was also possible to obtain the effect that good running characteristics could be obtained.

Further, in this embodiment, due to the characteristics of the polycrystalline ferrite described above, the sliding surface is not subjected to an initial treatment such as an etching treatment, and the unevenness of the desired height H and the interval P is formed only by lapping. There is also an effect that it can be obtained.

Further, in the polycrystalline ferrite used in this embodiment, so-called magnetostriction occurs in which the size of the magnetic material changes in each crystal grain when a magnetic field is applied. The distortion is almost zero. Similarly, the reverse magnetostriction effect in which magnetic flux is generated when stress is applied does not occur. Therefore, the polycrystalline ferrite material is used as the magnetic substrate material 5, 5 '.
When used as a magnetic tape, the sliding noise peculiar to the ferrite head generated by the mechanical stress applied from the magnetic tape to the magnetic head is also reduced.

Although the above-mentioned embodiment shows the case where the tape sliding surface is provided with the unevenness by the ion etching, the present invention is not limited to this. For example, using the photoresist described in Example 1 as a mask, nitric acid (HN
The tape sliding surface is made uneven by so-called chemical etching in which etching is performed using O ₃ ). Even in such a case, similarly to the other embodiments, the magnetic tape having extremely good surface smoothness is not damaged, without impairing the reproduction output.
It was possible to obtain the effect that good running characteristics could be obtained.

[0051]

As described above, according to the present invention, the intended purpose can be achieved. That is, it is possible to reduce the friction coefficient between the magnetic head and the magnetic tape without lowering the reproduction output even for a magnetic tape having an extremely smooth surface. Therefore, it is possible to obtain a magnetic head having good tape running characteristics and excellent tape contact even with respect to a magnetic tape having extremely good surface smoothness.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a magnetic head according to an embodiment of the present invention.

FIG. 2 is a front view showing a specific configuration example of a magnetic head of the same.

FIG. 3 is a plan view of the main part of the tape sliding surface of the magnetic head.

FIG. 4 is a characteristic diagram showing the relationship between the height of the unevenness of the tape sliding surface of the magnetic head, the friction coefficient and the reproduction output for explaining the operation of the present invention.

FIG. 5 is a perspective view of a main portion of a narrow track magnetic head according to another embodiment of the present invention.

FIG. 6 is a perspective view of a main part showing a polycrystalline magnetic head according to still another embodiment of the present invention.

FIG. 7 is a plan view of a tape sliding surface of a conventional magnetic head.

FIG. 8 is a plan view showing a photomask for producing unevenness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tape sliding surface 2 ... Protective and adhesive material 3 ... Magnetic gap 4 ... Winding window 5,5 '... Magnetic substrate material 6 ... Metal magnetic film 10 ... Narrow track part 11 ... Concavo-convex part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenkichi Inada 1410 Inada, Katsuta City, Ibaraki Prefecture Hitachi Ltd. AV Equipment Division

Claims (11)

[Claims] 1. A magnetic head for recording / reproducing information signals by sliding on a magnetic tape at a predetermined relative speed, wherein a height H is provided at least at a portion of a sliding surface on which the magnetic tape abuts the tape. , A magnetic head having irregularities of 2 nm ≤ H ≤ 50 nm arranged at intervals of 2 µm or less. 2. A magnetic head for recording / reproducing information signals by sliding on a magnetic tape at a predetermined relative speed, wherein a crystal grain size L is 0.1 μm ≦ L at least on a sliding surface with the magnetic tape. A magnetic head formed of a polycrystalline magnetic material having a size of ≦ 2 μm. 3. The magnetic head according to claim 1, wherein the sliding surface with respect to the magnetic tape is formed of a polycrystalline magnetic material having a crystal grain size L of 0.1 μm ≦ L ≦ 2 μm. 4. The magnetic head according to claim 2 or 3, wherein an inclination angle θ inside the end of the magnetic head in a direction perpendicular to the head scanning direction on the sliding surface of the magnetic tape is 90 ° <θ <180 °. 5. The magnetic head according to claim 1, wherein at least the sliding surface with respect to the magnetic tape is made of a single crystal magnetic material. 6. The width W of the magnetic tape sliding surface in the head scanning direction.
6. The magnetic head according to claim 1, wherein the thickness is 50 μm ≤ W ≤ 100 μm. 7. The magnetic head according to claim 1, wherein a radius of curvature Rx of the sliding surface of the magnetic tape in the head scanning direction is 3 mm ≦ Rx ≦ 15 mm. 8. The magnetic head according to claim 1, wherein a radius of curvature Ry of the sliding surface of the magnetic tape in a direction perpendicular to the head scanning direction is set to 1 mm ≦ Ry ≦ 4 mm. 9. A cross-section of an inverted V-shape, which is formed by a pair of metal magnetic films having an inverted V-shaped chevron projection shape and forming a magnetic circuit, but abutted against each other at their projections via a non-magnetic material. A portion is exposed on the magnetic tape facing surface, and the tips of the protrusions of the pair of metal magnetic films are planes parallel to each other and substantially perpendicular to the head scanning direction, and are indicated by the line of intersection between this plane and the magnetic tape facing surface. The width of the plane corresponds to the track width, at least one of the metal magnetic films has a coil winding window, and the metal magnetic film is a magnetic substrate material made of a ferrite material having protrusions corresponding to an inverted V shape. The magnetic head according to claim 1, wherein the magnetic head is formed on the magnetic head. 10. A magnetic substrate forming a magnetic head is Fe.
_2. A ferrite material composed of ₂ O ₃ : 40 to 60 mol%, ZnO: 5 to 20 mol%, and the balance being MnO.
9. The magnetic head according to any one of 1 to 9. 11. A magnetic recording / reproducing apparatus comprising the magnetic head according to claim 1.