JPS62157306A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the track fitting accuracy of a pair of magnetic core halves and to upgrade track width accuracy, yield and productivity and to reduce crosstalk by setting width on the magnetic gap forming surface of a thin metallic film for one magnetic core equal to track width and making width on the magnetic gap forming surface of the thin metallic film for the other magnetic core larger than said track width. CONSTITUTION:The magnetic core halves 21 and 22 forming ferromagnetic thin films 13 and 14 on a joint surface from which the magnetic cores 11 and 12 are obliquely notched are constituted. The width on the magnetic gap surface of the thin metallic film 14 equals the track width, while that of the thin metallic film 13 is larger by several mum than the track width. The core halves 21 and 22 are butted through a gap spacer so that the butted part of the thin films 13 and 14 can be the magnetic gap (g) of the track width. A coil hole 19 winding a coil is formed on the core half 12. Moreover track regulating grooves are installed on both sides of the magnetic gap (g), and nonmagnetic materials 17 and 18 are melted and filled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head, and more specifically, a magnetic gap is formed by abutting ferromagnetic metal thin films against each other via a gap spacer, and The present invention relates to a so-called composite magnetic head in which most of the magnetic core halves are formed of ferromagnetic oxide.

[Summary of the invention]

A magnetic core is made of a magnetic core made of a ferromagnetic oxide and a ferromagnetic metal TiJ film deposited on the magnetic core at a predetermined angle with respect to the magnetic gap forming surface on the surface facing the magnetic recording medium. Formation of a magnetic gap in a ferromagnetic metal thin film formed on one magnetic core half in a magnetic head in which a magnetic gap is formed by abutting the ferromagnetic metal thin films in a substantially straight line with each other. By making the width on the surface equal to the trunk width and setting the width on the magnetic gap forming surface of the ferromagnetic metal thin film formed on the other magnetic core half to be larger than the track width, the trunk width accuracy is improved and cross The aim was to create a system with less talk and superior yield and productivity.

[Conventional technology]

In the field of magnetic recording, high-density recording of information signals is progressing, and in response, magnetic recording media having high coercive force, such as so-called metal tapes and vapor-deposited tapes, are becoming widespread.

Furthermore, in order to write as many information signals as possible onto a magnetic recording medium of a predetermined area, efforts are being made to narrow the track width of each recording trunk recorded on a magnetic recording medium.

Under these circumstances, a number of demands have been placed on magnetic heads. For example, in order to perform good recording and reproduction on magnetic recording media with high coercive force and residual magnetic flux density, magnetic heads must be It is desired that the core material has a high saturation magnetic flux density and high magnetic permeability, and that the track width can be easily adjusted to a minute extent corresponding to the track width of the recording track.

It is difficult to create a magnetic head that satisfies these requirements from a single ferromagnetic oxide material such as ferrite material.
Therefore, a so-called composite magnetic head has been proposed in which a magnetic head is constructed by combining a ferromagnetic metal thin film having a high saturation magnetic flux density.

Among them, the applicant first filed Japanese Patent Application No. 58-250988.
The magnetic head proposed in this specification has excellent features such as being able to cope with the increase in magnetic force of magnetic recording media, being able to easily control the trunk width by adjusting the thickness of the ferromagnetic metal thin film, and having little crosstalk. It has unique characteristics and is expected to become popular.

The above magnetic head is made of Mn-Zn, as shown in FIG.
The abutting surfaces of a pair of magnetic core portions (101) and (102) formed of ferromagnetic oxide such as ferrite are diagonally cut out to form a ferromagnetic thin film forming surface (103).
), (104) are formed, and ferromagnetic metal thin films (105), (106) having high saturation magnetic flux density are coated on the ferromagnetic thin film forming surfaces (103), (104) by vacuum Tit film forming technology. Attach the magnetic core half (
111) and (112), and these ferromagnetic metal thin films (105) and (106) are brought into contact with each other via a gap spacer to form a magnetic gap g',
Furthermore, track width regulating grooves (107) and (108) for regulating the track width are provided on both sides of this magnetic gap g'.
is cut out, and the ferromagnetic metal thin film (105), (
Non-magnetic material (109) to prevent wear of 106)
, (110) are melt-filled.

[Problem that the invention seeks to solve]

By the way, in the magnetic head shown in FIG. 15, the ferromagnetic metal thin films (105) and (106) deposited on the respective magnetic core halves (111) and (112) are on the magnetic gap forming surface (113). The butt glass is bonded together.

However, the magnetic core half (101) configured as described above.

When performing track alignment using (102),
With the aforementioned narrowing of the track, the ferromagnetic metal thin film (10
5) , (106) tends to become thinner, so track misalignment is likely to occur, which is an unavoidable problem with current manufacturing methods. This track deviation is caused by the above-mentioned ferromagnetic metal thin M
This is also caused by variations in the film thickness of (105) and (106), and there is a strong demand for improvement.

In other words, when the track deviations Ir and s become large, crosstalk from adjacent tracks or adjacent tracks becomes noticeable, especially when recording and reproducing signals on the long wavelength side, resulting in deterioration of recording and reproducing characteristics. There is. Furthermore, the effective track width varies depending on the wavelength of the signal, which is unfavorable in terms of reliability of the head.

Therefore, in consideration of the above-mentioned track alignment accuracy, etc., extremely strict process control is required, which causes deterioration in yield and productivity.

Therefore, the present invention was proposed in view of the above-mentioned circumstances, and by improving the track alignment accuracy of a pair of magnetic core halves, the trunk width accuracy is improved, crosstalk is reduced, and the yield is improved. The purpose is to provide a magnetic head with excellent productivity.

[Means for solving problems]

In order to achieve the above object, the magnetic head of the present invention has the following features:
A magnetic core half is formed by a magnetic core made of a ferromagnetic oxide and a ferromagnetic metal thin film deposited on the magnetic core at a predetermined angle with respect to the magnetic gamb forming surface on the surface that faces the magnetic recording medium. In a magnetic head in which a magnetic gap is formed by abutting the ferromagnetic metal thin films in a substantially straight line, the magnetic gap forming surface of the ferromagnetic metal thin film formed on one magnetic core half. The width at the magnetic gap forming surface of the ferromagnetic metal thin film formed on the other magnetic core half is made larger than the trunk width.

[Effect]

Each of the ferromagnetic metal thin films formed on a pair of magnetic core halves is formed to have a different width on the magnetic gap forming surface, and the width of one magnetic core half is made equal to the trunk width, and the width of the other magnetic core half is made equal to the trunk width. Since the width of the half body is set to be slightly larger than the track width, the trunk width accuracy is ensured even if there is some misalignment when the magnetic core halves are butted together.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing an example of a magnetic head to which the present invention is applied, and FIG. 2 is an enlarged cross-sectional view of a main part showing the surface in contact with a magnetic recording medium.

In this magnetic head, a magnetic core portion (11).

(12) is formed of a ferromagnetic oxide, such as Mn-Zn ferrite, and these magnetic core parts (11), (12
) ferromagnetic thin film formation surface (11
a) In (12a), a high saturation magnetic flux density alloy is continuously applied from the front gap surface to the back gap surface,
For example, ferromagnetic metal thin films (13) and (14) made of Fe-A1-3i alloy are deposited and formed by vacuum thin film forming technology, and magnetic core halves (21) and (22) are formed, respectively.
) is configured.

Here, the ferromagnetic metal thin films (13) and (14) formed on each of the magnetic core halves (21) and (22) are bonded at the abutting surfaces of the magnetic core halves (21) and (22). The magnetic gap forming surface (10) has different widths a and b.

That is, the ferromagnetic metal thin film (14) deposited on one magnetic core half (22) is attached to the magnetic gap forming surface (1).
The ferromagnetic metal thin film (13) deposited on the other magnetic core half (21) is formed so that the width a at the magnetic gap forming surface (10) is equal to the desired track width T-. ) is adhered so that the width at the track width Tw is several μm larger than the track width Tw.

Then, a pair of magnetic core halves (2
1) and (22) are connected to the ferromagnetic metal thin 111i of the magnetic core half (11) through a gap spacer such as 5iOz,
The ferromagnetic metal thin films (13) and (14) are butted together so that the ferromagnetic metal thin film (14) of the other magnetic core half (12) is disposed within the width of (13). The combined portion is configured to form a magnetic gap g having a track width Tw (width a).

In addition, one magnetic core half (12) has a magnetic field,
An S wire hole (19) is provided for winding a coil for supplying a recording signal to the card or extracting a reproduction signal.

In addition, near the formation surface of the magnetic gap g, that is, on both sides of the magnetic gap g on the surface facing the magnetic recording medium,
Track width regulation groove (LLB) that regulates the track width T-
), (12b) are shaved off, and a non-magnetic material (17) is formed in the track width regulating groove (Ilb), (12b) and on the ferromagnetic metal thin films (13), (14).
, (18) is melt-filled, and this ferromagnetic metal filt film (13).

(14) is configured to prevent wear.

In this way, the width a of the ferromagnetic metal thin film (14) of one magnetic core half (22) is set to the desired track width T-, and the ferromagnetic metal thin film (13) of the other magnetic core half (21) is By setting the width Tw slightly larger than the trunk width Tw, the desired track width Tw can be maintained even if some track deviation occurs when aligning the tracks of each magnetic core half (21) and (22). A ferromagnetic metal thin film (13) is disposed within the range of the width.
, (14) A magnetic gap g having a trough-ref width Tw is formed at the joint surfaces of the two. Therefore, the magnetic core halves (2
Even if the ferromagnetic metal thin films (13) and (14) are joined with some deviation, a magnetic gap is formed by joining the ferromagnetic metal thin films (13) and (14), so the track width accuracy is greatly improved. Therefore, crosstalk from adjacent tracks and adjacent tracks can be reduced, resulting in a magnetic head with excellent recording and reproducing characteristics.

In the magnetic head of this embodiment, each of the magnetic core portions (1
1), (12) ferromagnetic metal thin film (
13) and (14) are connected in a substantially straight line with steps on the magnetic gear forming surface (10) when viewed from the surface facing the magnetic recording medium, and moreover, the magnetic gap forming surface (10)
10), each is inclined at an angle θ.

Here, the ferromagnetic thin film forming surface (lla), (12
The angle θ between a) and the magnetic gap forming surface (10) is
It is set in the range of 20@~80''.If this angle θ is 20
If the angle is smaller than 30°, crosstalk from adjacent trunks will increase, so it is preferable to set the angle to 30° or more. In addition, if the above angle is set to 90'', it will take a lot of time to form a thin film using vacuum thin film forming technology, and the film structure will become non-uniform. It is better to

The material of the ferromagnetic metal thin films (13) and (14) may be a ferromagnetic amorphous metal alloy, a so-called amorphous alloy (for example, one or more elements of Fe, Ni, Co, and P, C, B). , an alloy consisting of one or more elements of Si,
Or with this as the main component, A1゜Ge, Be, Sn, I
n, Mo, W, Ti, Mn.

Metal-metalloid amorphous alloys such as alloys containing Cr, Zr, HE, Nb, or Co.

HE, metal-metal amorphous alloy whose main components are transition metals such as Zr and rare earth elements), Fe-A1-3i
Base metal (Sendust), Fe-Aji alloy, Fe-3
i-based alloys, )"e-3i-Co-based alloys, Fe-Ni-based alloys (permalloy), etc. can be used, and the methods for forming the film include vacuum evaporation, sputtering, and ion blating.

Vacuum thin film forming technology, typified by, etc., is adopted.

The ferromagnetic metal thin films (13) and (14) are formed of a single layer in this example, but are made of, for example, SiO□, Taz
Os.

A plurality of layers may be formed via a highly wear-resistant insulating film such as AlxOx, Zr02, S13N4, etc. In this case, the number of laminated ferromagnetic metal thin films can be set arbitrarily.

In this way, for the magnetism of this embodiment, the width a of one ferromagnetic metal thin film (14) is made equal to the desired trunk width Tw, and the width of the other ferromagnetic metal thin film (13) is made equal to the desired trunk width Tw. Since it is set larger than the trunk width T11 of , even if there is some deviation, the ferromagnetic metal thin 1'! (13) , (
14) A magnetic gap is formed by butting them together.

Therefore, track width accuracy is greatly improved, and crosstalk from adjacent tracks and adjacent trunks can be reduced.
Good recording and reproducing characteristics can be obtained. Further, since the trunk width Tw is regulated by the track width regulation of one magnetic core half (12), the track width accuracy becomes more accurate.

Note that the present invention is not limited to the above-described embodiments, and as shown in FIG. 3, a pair of magnetic core halves (38)
, (39) ferromagnetic metal thin film (33).

(34) with the same film thickness, the magnetic gap forming surface (lO)
The trunk width regulating groove (31a
), (32b) may be used.

That is, the above ferromagnetic metal thin III (33), (
34) is formed slightly thicker than usual, and one magnetic core half (39) has a part of the ferromagnetic metal VR film (34) formed in the track width regulating groove (32b) near the magnetic gear g.
), the width C at the magnetic gap forming surface (10) is made equal to the desired track width T+++, and the structure is the same as the previous embodiment, even if it is joined to the other magnetic core half (31). Needless to say, the following effects can be obtained. In addition, in this Figure 3, the previous Figures 1 and 2
Components that are the same as those of the magnetic head shown in the figure are given the same reference numerals, and detailed explanations thereof are omitted.

Next, in order to make the structure of the magnetic field of the present invention more clear, a method of manufacturing the same will be explained.

First, a method for manufacturing the magnetic head shown in FIGS. 1 and 2 will be described with reference to FIGS. 4 to 10.

In order to manufacture the above magnetic head, first, as shown in FIG. ), a plurality of first kerfs (41) having a substantially V-shaped cross section are formed in parallel over the entire width of the substrate (40) using a rotary grindstone, etc., on the joining surface when the magnetic core halves are butted together. A thin film forming surface (41a) is formed. The ferromagnetic thin film forming surface (41a) is formed as a slope so as to be inclined at a predetermined angle θ with respect to the upper surface (40a) corresponding to the magnetic gap forming surface of the ferromagnetic oxide substrate (40). θ is set to approximately 45″ in this embodiment.

Next, as shown in FIG.
1a) over the entire upper surface (40a) of the substrate (40), for example, Fs-Aj! A -3i alloy is deposited using a vacuum thin film forming technique such as sputtering to form a ferromagnetic metal thin film (41a). The sputtering is performed at a predetermined incident angle with respect to the ferromagnetic bacteria 11Q forming surface (41a), so that the film thickness of the ferromagnetic metal thin film (42) is relative to the depth direction of the first kerf (41). It is formed so that it changes continuously. Furthermore, the ferromagnetic thin film formation surface (41a
) The film thickness of the ferromagnetic metal thin film (42) formed on the upper surface (40) of the substrate (40) corresponding to the magnetic gap forming surface is
The width e in a) is formed to be at least several μm larger than the desired track width.

Next, the iIJ magnetic oxide substrate (40
), a pair of ferromagnetic oxide substrates having different widths of the ferromagnetic metal thin film on the upper surface (40a) (magnetic gear/knob forming surface) are prepared.

First, a magnetic core half is manufactured in which the ferromagnetic metal thin film exposed on the top surface of the ferromagnetic oxide substrate is larger than the desired trunk width.

That is, as shown in FIG. 6, a ferromagnetic metal thin film (42
) is filled with a non-magnetic material (43) such as low-melting glass, and then the upper surface (40a) of the ferromagnetic oxide substrate (40) is surface ground. The upper surface (40a) of the substrate (40) is
Ferromagnetic metal thin 11! T! The end face of (42) is exposed.

Here, the above-mentioned surface grinding is performed on the ferromagnetic metal i11! exposed on the upper surface (40a)! The process ends when the width of (42) is several μm larger than the desired track width.

Next, as shown in FIG. 7, the ferromagnetic metal thin film (4
2) is adjacent to the ferromagnetic thin film forming surface (41a) on which is deposited, is in contact with the - side edge of the first cut a (41), and is parallel to the first cut groove (41). The second kerf (4
4) is formed, and the upper surface (40a) is mirror-finished. In this way, the width r of the ferromagnetic metal thin film (42) on the upper surface (40a) corresponding to the magnetic gap forming surface is
However, the magnetic core half (4) is slightly larger than the desired track width.
5) Produce.

Next, i! A! A magnetic core half is manufactured in which the width of the ferromagnetic metal gJ film exposed on the upper surface of the magnetic oxide substrate is equal to the desired track width.

First, a substrate (50) identical to the ferromagnetic oxide substrate (40) shown in FIG. 5 is prepared. As shown in FIG. 8, the ferromagnetic oxide substrate (50) has a non-magnetic material ( 46), the upper surface (50a) of the ferromagnetic oxide substrate (50) is surface-ground to provide a good level of smoothness.
The process is continued until the width of the ferromagnetic metal thin film (42) exposed in 0a) is approximately equal to the desired track width.

Next, as shown in FIG. 9, the ferromagnetic metal thin film (4
2) is adjacent to the ferromagnetic thin film forming surface (41a) on which is deposited, is in contact with the - side edge of the first kerf (41), and is parallel to the first kerf (41). The second kerf (4
7) is formed, and the upper surface (50a) is mirror-finished. In this way, the ferromagnetic gold 'Fit film (42) on the upper surface (50a) corresponding to the magnetic gap forming surface is formed.
The width l of the magnetic core half (4) is equal to the desired track width.
8) is obtained.

Furthermore, although not shown, a first kerf and a first groove are formed on one of the pair of magnetic core halves (45) and (48) produced by the above steps. 2
A groove is machined in a direction perpendicular to the cut groove to form a winding hole for winding the coil.

Subsequently, after coating a gap spacer (not shown) on at least one of the upper surfaces of each of the magnetic core halves (45) and (48), a ferromagnetic metal thin film of the magnetic core half (48) is applied. (42) are butted together within the width β of the ferromagnetic metal thin film (42) of the magnetic core half (45). And these magnetic core halves (45), (48
) are fused with glass or the like, and at the same time, the second grooves (44) and (47) are filled with a non-magnetic material (49). In addition, in this fusion step, the second cut groove (4
4).

(47) is filled with the non-magnetic material (49), as described above, not at the same time as the fusion of the magnetic core halves (45) and (48), but in the process shown in FIGS. 7 and 9, for example. The second kerfs (44) and (47) may be filled with a non-magnetic material (49) in advance, and only glass fusion may be performed in the step shown in FIG. 1O.

In this way, the ferromagnetic metal thin film (
The film thickness r (corresponding to the desired track width) of 42) is the film thickness l of the ferromagnetic metal Wi film (42) of the magnetic core half (45).
This track alignment process is easier because it is smaller than . Therefore, defects due to track misalignment are significantly reduced, yield is improved, and productivity is significantly improved. This also has the advantage that the track alignment process described above can be automated.

Further, since trunk width control can be performed on one magnetic core half (4B), it is very advantageous in terms of man-hours and manufacturing costs can be reduced.

Finally, x-x&! in Figure 10. i! After cutting out a plurality of head chips by slicing at the x'-x' line positions, the magnetic recording medium facing surface is cylindrically polished to complete the magnetic head shown in FIGS. 1 and 2. At this time, by making the slicing direction of the magnetic core halves (45) and (48) inclined with respect to the abutting surfaces, it is possible to create a magnetic field for azimuth recording.

Here, one magnetic core half (11) of the magnetic head shown in FIGS. 1 and 2 is connected to the one ferromagnetic oxide substrate (4).
0) as a base material, and the other magnetic core half (12) uses the other ferromagnetic oxide substrate (50) as a base material. Further, the magnetic gear forming surface (1) of the ferromagnetic metal thin film (14)
The width at 0) is the width f of the ferromagnetic metal thin film (42) exposed on the upper surface (40a) of the ferromagnetic oxide substrate (40), and the width a of the ferromagnetic metal thin film (13) is Metal thin film (
42).

Next, a method for manufacturing the magnetic head shown in FIG. 3 will be described with reference to FIGS. 11 to 13.

To manufacture this magnetic head, first, as shown in FIG. 11, a strong 61 oxide substrate shown in FIG. (6
0). In this case as well, the width m of the ferromagnetic metal thin film (62) exposed on the upper surface (60a) corresponding to the magnetic gap forming surface is formed to be several μm larger than the predetermined track width.

Next, as shown in FIG. 12, the ferromagnetic metal thin film (6
Second kerfs (64a) and (64b) are formed adjacent to the ferromagnetic thin film forming surface (61a) on which 2) is deposited and parallel to the first kerf (61). However, the second cuts a (64a) and (64b) are formed so that two different types of intervals A and B are alternately repeated. That is, one second kerf (64a) is cut so as to be in contact with the - side edge of the first kerf (61), and the other second kerf (64b) is cut 2 m from the first kerf (61). Cut it so that it slightly overlaps the negative edge of (61). Further, an upper surface (60a) corresponding to the magnetic gap forming surface is provided.
) Width p of the ferromagnetic metal thin film (62).

q is the second cut on one side? ! The width p regulated by (64a) is cut to be several μm larger than the desired track width, and the width q regulated by the other second kerf (64b) is made equal to the predetermined track width. Cut like this.

According to this manufacturing method, the second kerf (64a), (
64b), a magnetic head with excellent trunk width accuracy and low crosstalk can be manufactured by simply changing the pitch of the grindstone. Therefore, it is advantageous in terms of productivity and yield.

Next, although not shown, a winding hole is formed in one of the pair of ferromagnetic oxide substrates (60) produced by the process described above, and the ferromagnetic oxide A physical substrate (70) is obtained.

Next, a gap spacer is attached to at least one of the upper surfaces of the substrates (60) and (70), and as shown in FIG. (62) and the ferromagnetic metal thin film (62) having the above-mentioned width q are arranged so as to be butted against each other. Then, at the same time as these substrates (60) and (70) are fused together using glass, the second cutter is removed. a (64a),
(64b) is filled with a non-magnetic material (66).

Thereafter, the block obtained by combining the substrate (60) and the substrate (70) is subjected to slicing processing at the positions of the Y-Y line and the Y'-Y' line in FIG. 13 to cut out a plurality of head chips.

Finally, cylindrical polishing is applied to the surface of each cut out head chip that faces the magnetic recording medium to complete the magnetic head shown in FIG. 3.

Here, one magnetic core half (38) of the magnetic head shown in FIG. 3 uses the one ferromagnetic oxide substrate (60) as a base material, and the other magnetic core half (39) uses the other magnetic oxide substrate (60) as a base material. The base material is a ferromagnetic oxide substrate (39). Further, the width d of the ferromagnetic metal thin film (33) corresponds to the width p shown in FIG. 12, and the radius C of the ferromagnetic metal thin film (34) corresponds to the width q shown in FIG.

〔Effect of the invention〕

As is clear from the above description, according to the magnetic head of the present invention, the width of the ferromagnetic metal thin film formed on one magnetic core half on the magnetic gap forming surface is made equal to the track width, and the width of the ferromagnetic metal thin film formed on one magnetic core half is made equal to the track width Since the width of the magnetic gap forming surface of the ferromagnetic metal thin film formed on the core halves is set to be larger than the track width, the matching accuracy during trunk matching is greatly improved. Therefore, track width accuracy is improved, crosstalk from adjacent tracks and adjacent tracks is reduced, and a magnetic head with excellent recording and reproducing characteristics is obtained.

Furthermore, as the accuracy of matching the trunks improves, the yield during processing becomes better, and the magnetic head becomes superior in terms of productivity.

Furthermore, since the trunk width is regulated by the track width of one magnetic core half, the number of manufacturing steps can be reduced, which is advantageous in terms of manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an embodiment of a magnetic head to which the present invention is applied, and FIG. 2 is an enlarged plan view of a main part showing the surface in contact with a magnetic recording medium. FIG. 3 is an enlarged plan view of a main part showing a surface in contact with a magnetic recording medium according to another embodiment of the present invention. 4 to 10 are cross-sectional views showing the manufacturing process of the magnetic head shown in FIGS. 1 and 2 according to the steps,
Figure 4 shows the first kerf machining process, Figure 5 shows the ferromagnetic metal thin film forming process, Figure 6 shows the glass filling and surface polishing process for producing one magnetic core half, and Figure 7 shows the process. Fig. 8 shows the glass filling and surface polishing process for producing the other magnetic core half, Fig. 9 shows the second kerf processing process, and Fig. 10 shows the glass fusing process. Each is shown below. 11 to 13 are cross-sectional views showing the manufacturing process of the magnetic head shown in FIG. 3 according to the steps. FIG. 11 shows the glass filling and surface polishing process, and FIG. FIG. 13 shows the glass fusing process. FIG. 14 is an enlarged plan view of essential parts showing a surface of a conventional magnetic head that faces a magnetic recording medium.

Claims (1)

[Claims] A magnetic core made of a ferromagnetic oxide, and a ferromagnetic metal deposited on the magnetic core so as to be inclined at a predetermined angle with respect to the magnetic gap forming surface on the surface facing the magnetic recording medium. In a magnetic head in which a magnetic core half is formed of a thin film and a magnetic gap is formed by abutting the ferromagnetic metal thin films in a substantially straight line, a ferromagnetic metal formed on one of the magnetic core halves. A magnetic head characterized in that the width of the thin film on the magnetic gap forming surface is equal to the track width, and the width of the ferromagnetic metal thin film formed on the other magnetic core half on the magnetic gap forming surface is larger than the track width. .