JP2002329301A - Magnetic recording/reproducing head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin film magnetic head having excellent recording performances such as high recording magnetic field or high recording efficiency in a narrow track width of 2 μm or lower, and capable of highly accurately forming a narrow magnetic pole pattern. SOLUTION: An upper magnetic core to determine a recording track width is constituted of two parts, i.e., a first part 110 exposed on a medium opposite surface, and a second part 111 not exposed on the medium opposite surface, but larger in witch and film thickness than the first part 110, a tip of which is arranged between the surface opposite to the medium and a point 112 of throat height = 0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film magnetic head used for a magnetic storage device and a method for manufacturing the same.

[0002]

2. Description of the Related Art In order to increase the recording density of a magnetic storage device, it is essential to increase the track density as well as the bit density. In order to increase track density,
Along with the improvement of the head positioning accuracy, it is necessary to reduce the track width of the magnetic head.

Conventionally, an inductive type thin film magnetic head which is a recording / reproducing type has been used as a magnetic head. However, with the recent rapid increase in recording density, a magnetoresistive (MR) head or a reproducing head has been used as a reproducing head. Giant magnetoresistance effect type (GM
R) A recording / reproducing separation type head using a head has become mainstream. However, even in these high performance heads, the same inductive type thin film magnetic head as that of the related art is applied as a recording head. Therefore, in order to improve the recording density, the track width of the reproducing head is reduced, and the tip width of the magnetic pole (magnetic film) that determines the recording track width is reduced while maintaining the performance of the recording head at a high level. It is essential to form.

What is important as the performance of the recording head is that
(1) The recording magnetic field is large, the magnetic field gradient is large, and O
The magnetic transition length on the medium can be reduced with excellent / W (overwrite) characteristics; (2) recording bleeding is small, and a sharp magnetic transition can be recorded even at the end of the track; (3) the recording efficiency is large; In addition, magnetization transition can be recorded at a correct timing even during high-frequency operation.

In order to realize such excellent recording performance, for example, in order to increase the recording magnetic field and the magnetic field gradient, Japanese Patent Application Laid-Open No. 8-339508 discloses that the saturation magnetic flux density is 1.
A thin-film magnetic head using Fe-Ta-N, which is as large as 5 to 1.8 T, as a part of a magnetic pole is disclosed. Among them, a cross-sectional structure of a thin-film magnetic head in which a normal upper magnetic core is divided into two parts, and a tip near a magnetic gap is Fe-Ta-N to improve recording characteristics is shown.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 8-339 is disclosed.
In the prior art described in Japanese Patent Publication No. 508, a recording magnetic field and a magnetic field gradient can be improved because a material having a higher saturation magnetic flux density is used as a part of a magnetic pole than permalloy (1T), which has been used before. It is. However, in the above-mentioned prior art, only the improvement of the head structure in the longitudinal section direction is shown, and no effect is recognized regarding the structure improvement in the track width direction. That is, when the track width is reduced, no solution has been proposed for the point that the recording magnetic field gradually decreases even if the saturation magnetic flux density is increased to about 1.8T. For example, in the area where the areal recording density exceeds ² Gb / in ² , the recording track width is often about 2 μm or less. Even if a material of about 1.8 T is used for the magnetic pole, the conventional structure is simply used. When the tip width (track width) of the recording head is reduced, the recording magnetic field gradually decreases, and it becomes impossible to correctly record the magnetization transition on the medium. In particular, when the coercive force of the medium must be increased with an increase in the recording density, such a decrease in the recording magnetic field has been a serious problem.

An object of the present invention is to provide a thin-film magnetic head having excellent recording performance even at a track width of 2 μm or less and capable of forming a narrow magnetic pole pattern with high precision, and a method of manufacturing the same.

[0008]

In order to achieve the above object, a thin-film magnetic head according to the present invention has a throat of at least one of two magnetic films forming a magnetic circuit with a magnetic gap film interposed therebetween. A portion closer to the surface facing the magnetic recording medium than the height = 0 point is exposed to the surface facing the magnetic recording medium, and a first portion that determines the recording track width is exposed to the surface facing the magnetic recording medium. The second portion is not formed, and the magnetic path cross-sectional area of the second portion is larger than the magnetic path cross-sectional area of the first portion.

The throat height is the distance at which the upper magnetic core and the lower magnetic core are arranged with only the recording gap film interposed.

The upper limit of the cross-sectional area of the magnetic path of the second portion is not particularly limited in terms of function, but is 30 times larger than the cross-sectional area of the first portion due to the size of the thin-film magnetic head itself. The size is preferably as follows. In this thin-film magnetic head, it is desirable that the film thickness of the second portion is at least partially larger than the film thickness of the first portion.

According to another aspect of the present invention, there is provided a thin-film magnetic head according to the present invention, wherein at least one of two magnetic films forming a magnetic circuit with a magnetic gap film interposed therebetween has a throat height = 0. A portion closer to the surface facing the magnetic recording medium than the point is exposed to the surface facing the magnetic recording medium to determine a recording track width, and a first portion that is not exposed to the surface facing the magnetic recording medium. The second portion is wider than the first portion, and the second portion has a thickness at least partially greater than that of the first portion. Things.

The upper limit of the width of the second portion and the upper limit of the thickness of the film are not particularly limited in terms of function. However, due to the size of the thin-film magnetic head itself, the width of the second portion is 20 times the width of the first portion. Hereinafter, it is preferable that the thickness be three times or less the thickness of the first portion.

In any of the above thin film magnetic heads, it is desirable to provide a protective film on at least a part of the surface of the first portion.

According to another aspect of the present invention, there is provided a thin-film magnetic head according to the present invention, wherein at least one of two magnetic films forming a magnetic circuit with a magnetic gap film interposed therebetween is connected at one end to a magnetic recording medium. A second pattern disposed between the opposing surface and the point where the throat height = 0 and the other end disposed inside (at the side opposite to the side facing the magnetic recording medium) the point where the throat height = 0; One end is exposed on the surface facing the magnetic recording medium to determine the recording track width, and the other end is the second end.
And a first pattern disposed inside the above-mentioned one end of the first pattern, and at least a part of the first pattern and the second pattern are laminated.

In this thin-film magnetic head, the other end of the first pattern (the side where the recording track width is not determined) is located at the same position as the point of throat height = 0 or inside the point. Is desirable. Further, the insulating film provided on the recording gap film has a two-layer structure,
The other end of the pattern may be arranged on a layer of the insulating film closer to the recording gap film. Further, it is preferable that the width of the one end (the surface facing the magnetic recording medium) of the second pattern is larger than the width of the one end exposed on the surface facing the magnetic recording medium of the first pattern. Still further, the first pattern has a film structure of two or more layers, a first magnetic film having a large saturation magnetic flux density is arranged closer to the recording gap film, and a second magnetic film having a smaller saturation magnetic flux density is arranged. Is preferably located farther from the recording gap film.

In any of the above thin film magnetic heads, the saturation magnetic flux density of the first portion or the first pattern is equal to or higher than the saturation magnetic flux density of the second portion or the second pattern. Is also desirable. Furthermore, it is desirable that the specific resistance of the first portion or the first pattern is equal to or greater than the specific resistance of the second portion or the second pattern. In addition, one end of the second portion or the second pattern, which is closer to the surface facing the magnetic recording medium, is preferably at least 0.2 μm away from the surface facing the magnetic recording medium, more preferably at least 0.5 μm. Is more preferable.

The thin-film magnetic head described above is not only a thin-film magnetic head for both recording and reproduction but also a recording-only thin-film magnetic head used in combination with a reproducing head such as an MR head or a GMR head, as described in the prior art. It is also effective for

Further, in order to achieve the above object,
According to the method of manufacturing a thin-film magnetic head of the present invention, a lower magnetic film, a magnetic gap film, and a first insulating film for determining a position of throat height = 0 are formed on a substrate, and one end thereof faces a magnetic recording medium. A first magnetic film pattern which is exposed on the surface and determines the recording track width, and the other end of which is disposed at or inside (at the side opposite to the side facing the magnetic recording medium) the throat height = 0 is set to a desired value. A conductor coil and a second insulating film are formed by using a photoresist having a thickness, and one end of the conductor coil and the surface facing the magnetic recording medium and the throat height =
0, and the other end is throat height = 0
Forming a second magnetic film pattern disposed on the inner side of the point, forming the upper magnetic film by the first and second magnetic film patterns, and setting the desired thickness of the photoresist to the first thickness.
And the thickness of the second insulating film is made thinner.

The desired thickness of the photoresist is preferably 2 μm or more from the viewpoint of easy selection of processing conditions.

The reason why excellent recording performance can be realized by keeping the recording magnetic field large even when the track width is reduced to 2 μm or less according to the present invention will be described with reference to FIG.

FIG. 2A is a perspective view showing a shape of an upper magnetic core portion which determines a recording track width of a conventional thin film magnetic head. In the figure, the structure of only the head end portion close to the magnetic medium facing surface (hatched surface) is shown, and the protective film formed on the upper magnetic core is omitted for easy understanding. . This thin-film magnetic head has a lower magnetic core 207, a recording gap film 208, an upper magnetic core 200, and an insulating film 209. Here, the tip portion of the insulating film 209 corresponds to a point of throat height = 0. Although not shown in the drawing, a coil is embedded in the insulating film 209 to excite a magnetic circuit (not shown, but connected at the rear of the magnetic head) including the upper magnetic core 200 and the lower magnetic core 207. It has the function of generating a recording magnetic field in the magnetic gap at the tip of the head.

FIG. 2B is a perspective view showing the shape of the tip of the thin-film magnetic head of the present invention. The top end of the upper magnetic film, which determines the recording track width, has a first portion 210 exposed on the surface facing the magnetic medium, and a first portion 210 that is not exposed on the surface facing the magnetic medium and has a higher magnetic path than the first portion. And a second portion 211 having a large area. Second part 211
Is wider (3 μm) than the first portion 210, and
The film thickness is also large. FIG. 2 shows a comparison between the calculated values of the recording magnetic field (longitudinal recording direction) generated from the thin film magnetic heads having these structures.
It is shown in (c). Here, the track width is 1.0 μm, the d portion dimension is 1.5 μm, the saturation magnetic flux density and the film thickness of the upper magnetic core 200 and the first portion 210 are 1.7 T and 3 μm, respectively, and the spacing between the head media is set. Was assumed to be 70 nm.

As apparent from FIG. 2, in the conventional thin film magnetic head, when the track width is reduced to 1 μm, the maximum recording magnetic field is at most about 4800 Oe even if the magnetomotive force is increased to 0.7 AT. It becomes difficult to perform sufficient saturation recording on a recording medium having a coercive force exceeding 2000 Oe. On the other hand, in the thin-film magnetic head of the present invention, a magnetic field of 5000 Oe or more can be generated with a magnetomotive force of about 0.4 AT, and a larger recording magnetic field can be obtained as compared with the conventional structure. As a result, it is possible to correctly record the magnetization transition on the medium. In addition, since operation with a low magnetomotive force is possible, the recording current can be reduced, and the switching time of the current can be easily reduced, which is advantageous for high-frequency recording and high-speed transfer.

The reason why the recording magnetic field can be increased and the recording efficiency can be improved by using the present invention is considered as follows. That is, in the conventional structure, as the track width becomes narrower, the upper core (2 in FIG.
17) The recording magnetic flux is likely to be saturated in the portion 17), and the amount of magnetic flux reaching the magnetic medium facing surface is reduced. However, as in the present invention, the amount of magnetic flux reaching the tip of the head is increased by increasing the width of the core (the second portion 211 in FIG. 2B) close to the surface facing the magnetic medium (to increase the recording efficiency). And a large recording magnetic field can be realized as a result.

Here, the above dimensions (track width: 1)
μm) is shown as an example, but in actual application, the recording magnetic field should be increased, the recording magnetic field gradient should be increased, the magnetic field in the track width direction and the magnetic field gradient distribution should be uniform, It is necessary to optimize the head structure while paying attention to controlling the recording bleeding at the end of the track, and in all cases, the head having the above dimensions is not always desirable. Although the case where the track width is determined by the upper magnetic core of the two upper and lower magnetic cores has been described above, the same structure can be applied to the lower magnetic core. Further, it is clear that the recording magnetic field increasing effect according to the present invention increases its effectiveness as the track width decreases,
This is particularly effective when a thin-film magnetic head having a recording track width of 2 μm or less is manufactured.

The recording magnetic field distribution and the magnetic field gradient distribution can be improved by making the saturation magnetic flux density of the first portion, which determines the actual recording track width, larger than the saturation magnetic flux density of the second portion. . Since the second portion has a larger width and / or thickness than the first portion, even if the saturation magnetic flux density is small, the saturation of the recording magnetic flux hardly occurs. Also, by increasing the specific resistance of the second portion,
The eddy current loss of the head during high-frequency operation is reduced, and a thin-film magnetic head suitable for high-speed data transfer can be realized. Since it is important to increase the saturation magnetic flux density in the first portion as described above, even if the specific resistance is smaller than that in the second portion, there are few problems and the restriction on material selection can be reduced. Further, the first portion is composed of a laminated film, and a two-layer film of a film having a high saturation magnetic flux density on the side close to the recording gap and a film having a low saturation magnetic flux density laminated thereon has a track width. The recording magnetic field distribution in the direction can be improved.

[0027]

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

FIG. 1 is a perspective view showing a shape of an upper magnetic core portion which determines a recording track width of a thin film magnetic head as one embodiment of the present invention. In the figure, the structure of only the head end portion close to the magnetic medium facing surface (hatched surface) is shown, and the protective film formed on the upper magnetic core is omitted for easy understanding. . In addition,
The materials, dimensions, film configurations, and the like shown here are only examples, and there is no problem even if they are changed within a range that does not impair the gist of the present invention.

This thin-film magnetic head is made of Al ₂ O ₃ —Ti
Substrate 101 made of C-based ceramics, base film 102 made of Al ₂ O ₃ , lower shield film 10 made of FeAlSi constituting MR head portion serving as a reproducing head
3, reproduction gap film 104 made of Al ₂ O ₃ , NiF
e, an MR sensor film 105 composed of a laminated film such as e, an electrode film 106 composed of a laminated film such as Ta, and an upper shield film composed of NiFe (also serving as a lower magnetic core of the recording head) 10
7. Recording gap film made of Al ₂ O ₃ (thickness 0.3 μm)
m) 108. An organic insulating film 109 made of a thermally cured photoresist (not shown, but having a coil embedded therein) and an upper magnetic core are provided thereon. The upper magnetic core is a magnetic medium (not shown)
A first portion (thickness 2. μm) 110 that determines the track width (1.0 μm) exposed on the facing surface, and a width that is not exposed on the magnetic medium facing surface and is wider than the first portion. And a second portion 111 having a large thickness (3.0 μm) and a large thickness (3.0 μm).

Here, the first portion 110 is made of CoNiFe having a saturation magnetic flux density of 1.6 T, and the second portion 111 is made of NiFe having a saturation magnetic flux density of 1.0 T. Further, the tip of the second portion 111 is disposed 2.0 μm ahead of the point 112 of the throat height = 0 (the one closer to the magnetic medium facing surface), and from there, the tip of the first portion 110 (the position facing the magnetic medium). The distance to the surface position) was 1.5 μm.

When the overwrite characteristics of the thin film magnetic head thus manufactured and the thin film magnetic head having the conventional structure and the track width of 1.0 μm were compared, the magnetomotive force was 0.4 A.
Under the conditions of T, medium coercive force of 2,500 Oe, and head-to-medium spacing of 70 nm, the conventional structure head is -36 dB in this embodiment, compared with -22 dB, and the recording magnetic field is increased to improve the recording characteristics. That was confirmed.

FIGS. 3A and 3B are a perspective view and a side sectional view showing a structure of an upper magnetic core portion of a thin film magnetic head as another embodiment of the present invention. The structure from the substrate to the MR sensor film, the electrode film, and the reproducing gap film is the same as that in FIG. This thin-film magnetic head includes an upper shield film (also serving as a lower magnetic core of the recording head) 307 made of NiFe, Al ₂ O
_{On the} recording gap film (thickness 0.3 .mu.m) 308 made of photo-resist, an organic insulating film 3 made of a thermoset photoresist is formed.
09, a coil 312 made of Cu and an upper magnetic core are formed.

As shown in FIG. 3B, the upper magnetic core has a magnetic medium (not shown) at the tip of the magnetic core.
A first pattern (thickness: 2.5 μm) 310 that determines the track width (1.2 μm) exposed on the facing surface, and a first pattern 310 that is not exposed on the facing surface of the magnetic medium and that forms the rear portion of the magnetic core. And two patterns (thickness: 4.0 μm) 311. Here, the end 313 of the first pattern 310 on the side not exposed to the magnetic medium facing surface is the second end 313.
Is arranged inside the tip 314 of the pattern of FIG.
And a magnetic coupling area between the second patterns is ensured. Also, as in the example shown in FIG. 1, the first pattern 310 uses CoNiFe having a saturation magnetic flux density of 1.6 T, and the second pattern 311 has a saturation magnetic flux density of 1.0 T.
iFe was used. Further, on the surface of the first pattern, A
A protective film (thickness 0.5 μm) 315 made of l ₂ O ₃ was provided to prevent damage to the surface of the first pattern during the formation of the second pattern. However, as shown in FIG. 3B, at the connection portion of the first and second patterns, this protective film was removed to secure magnetic coupling.

FIGS. 4A and 4B are a perspective view and a side sectional view showing the structure of an upper magnetic core portion of a thin-film magnetic head as another embodiment of the present invention. The structure from the substrate to the MR sensor film, the electrode film, and the reproducing gap film is the same as that in FIG. This thin-film magnetic head includes an upper shield film 407 (also serving as a lower magnetic core of the recording head) made of NiFe, Al ₂ O
_A first organic insulating film 409 made of a thermally cured photoresist, a coil 412 made of Cu, and a second organic insulating film made of a thermally cured photoresist on a recording gap film (thickness 0.3 μm) 408 made of 416 and an upper magnetic core.

As shown in FIG. 4B, the upper magnetic core has a magnetic medium (not shown) at the tip of the magnetic core.
A first pattern (thickness: 3.1 μm) 410 for determining a track width (1.2 μm) exposed on the opposing surface, and a first pattern that is not exposed on the magnetic medium opposing surface and forms a rear portion of the magnetic core. And two patterns (thickness: 4.0 μm) 411. Here, the end 413 of the first pattern 410 on the side not exposed to the magnetic medium facing surface exceeds the point 417 of throat height = 0, and the first organic insulating film 4
09 surface.

FIG. 5 is a side sectional manufacturing process diagram showing a method of manufacturing a thin film magnetic head according to one embodiment of the present invention. Here, an example has been described as a method of manufacturing the thin film magnetic head shown in FIG. As in the past, structures from the substrate to the MR sensor film, the electrode film, and the reproducing gap film have been omitted. First, an upper shield film made of NiFe (3.0 μm in thickness also serving as a lower magnetic core of the recording head) 50
7. Recording gap film made of Al ₂ O ₃ (thickness 0.3 μm)
m) After forming 508, point 51 at throat height = 0
A first organic insulating film 509 (thermosetting photoresist, thickness of 3.0 μm) 509 for determining 7 was formed, and the structure shown in FIG. 5A was obtained. Then, the first pattern (3.5 μm thick) of the upper magnetic film that determines the recording track width is formed by plating using a 4.0 μm thick photoresist (not shown).
m) 510 was formed to obtain the structure in FIG. Here, the plating film was a two-layer film of a FeNi film (thickness 1.0 μm) 518 having a saturation magnetic flux density of 1.7 T and a NiFe film (thickness 2.5 μm) 519 having a saturation magnetic flux density of 1.0 T. Thereafter, as shown in FIG. 5C, the coil (thickness: 2.5 μm) 5
12 and a second organic insulating film (thickness: 6.0 μm) 516 are formed thereon. Then, as shown in FIG. 5D, a second pattern (NiFe, thickness: 4.0 μm) 51 of the upper magnetic film is formed thereon.
1 was formed. Here, the second pattern of the upper magnetic film was formed by a plating method using a photoresist (not shown) having a thickness of 12 μm.

In the thin film magnetic head having the conventional structure, in order to determine the recording track width, a photoresist pattern is formed at a high step portion corresponding to the sum of the step heights of the first and second organic insulating films, and the upper magnetic layer is formed. Since a core pattern had to be produced, a pattern having a track width of 2 μm or less had to be produced using a photoresist having a thickness of 10 μm or more, and it was difficult to produce a highly accurate pattern. However, if the manufacturing method of the present invention is used,
As described above, the thickness of the photoresist can be reduced to half, for example, 4 μm or less, so that a high-precision pattern of 1 μm or less can be produced. Therefore, there is an advantage that a thin-film magnetic head having a narrow track structure can be easily manufactured. Specifically, it has been difficult to produce a magnetic head having a track width of 2 μm or less by the conventional method. However, by applying the method of the present invention, 0.6 μm
A thin-film magnetic head having a track width up to the maximum can be manufactured.

FIG. 6 is a perspective view showing an example of the magnetic storage device. The surface cover has been removed for clarity. One of the above-described thin film magnetic heads 601 is attached to an arm, attached to the tip of a positioning mechanism 603, and arranged on a rotatable magnetic recording medium 602. Thus, information is written to and read from the magnetic recording medium 602. Further, the magnetic storage device includes a drive motor for rotating and driving the magnetic recording medium 602, control means for controlling the drive motor, an electromagnetic converter for writing or reading information, a control circuit therefor, and a control circuit for controlling the positioning mechanism 603. Etc.

According to the present invention, the recording track width is 1.4 μm.
m and a track density of 15 kTPI (1 inch / inch).
5,000 tracks), areal recording density 3.6 Gb / in ²
And a recording capacity GB can be achieved with a magnetic recording apparatus using three 2.5-inch diameter recording media.

[0040]

According to the present invention, the recording track width is 2 μm.
Even in the case of the following narrowing, a sufficiently large recording magnetic field can be generated and a recording operation with a low magnetomotive force can be realized, so that a high recording density and a high-frequency high-speed transfer of the magnetic disk device have been achieved. Further, according to the production method of the present invention,
It has become possible to form a magnetic pole pattern of a thin-film magnetic head that determines a recording track width of 2 μm or less with high accuracy, and to realize a high yield.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic structure of a main part of a thin film magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic structure of a main part of a thin-film magnetic head according to a conventional example and an embodiment of the present invention, and a diagram showing the performance of both.

FIG. 3 is a perspective view and a side sectional view showing a schematic structure of a main part of a thin film magnetic head according to another embodiment of the present invention.

FIG. 4 is a perspective view and a side sectional view showing a schematic structure of a main part of a thin-film magnetic head according to still another embodiment of the present invention.

FIG. 5 is a manufacturing process diagram showing a method for manufacturing a thin-film magnetic head according to one embodiment of the present invention.

FIG. 6 is a perspective view of an example of a magnetic storage device using the thin-film magnetic head of the present invention.

[Explanation of symbols]

101: substrate, 102: base film, 103: lower shield film, 104: read gap film, 105: MR sensor film,
106 ... electrode film, 107, 207, 307, 407, 5
07 ... Lower magnetic core (upper shield film), 108, 20
8, 308, 408, 508 ... recording gap film, 10
9, 309: Organic insulating film, 110, 210: First portion, 111, 211: Second portion, 112, 417, 5
17: point of throat height = 0, 200: upper magnetic core, 209: insulating film, 310, 410 ... first pattern, 311, 411 ... second pattern, 312, 41
2, 512... Coil, 313, 413... End (of the first pattern), 314.
15: protective film, 409, 509: first organic insulating film, 41
6, 516: second organic insulating film, 510: upper magnetic film first
Pattern, 511 ... second pattern of the upper magnetic film, 601 ...
Thin film magnetic head, 602: magnetic recording medium, 603: positioning mechanism.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadayuki Iwakura 2880 Kozu, Odawara City, Kanagawa Prefecture Inside the Hitachi, Ltd. Storage Systems Division (72) Inventor Naoki Koyama 2880 Kozu, Kozu, Odawara City, Kanagawa Storage Hitachi, Ltd. Within the System Division (72) Inventor Tetsuya Okai 2880 Kozu, Odawara-shi, Kanagawa F-term within the Storage Systems Division, Hitachi, Ltd. 5D033 BA07 BA08 BA13 BB43 CA01

Claims (12)

[Claims] A magnetic recording head formed on the magnetic reproducing head, wherein the magnetic recording head includes a lower magnetic core, and a magnetic recording head on at least a recording medium facing surface side of the lower magnetic core. A recording gap film formed on the lower magnetic core, a coil formed on an opposite side to the recording medium facing surface of the lower magnetic core with an insulating film interposed therebetween, and a recording gap film formed on the coil with an insulating film interposed therebetween. An upper magnetic core connected to the lower magnetic core on the side opposite to the recording medium facing surface, the upper magnetic core being formed on the recording medium facing surface and facing the lower magnetic core. The upper magnetic core is at least exposed to the recording medium facing surface and has a first portion that determines the recording track width, and a first portion that is not exposed to the recording medium facing surface and has a larger cross-sectional area than the first portion. Is in front Magnetic recording and reproducing head, characterized in that a second portion in the recording gap. 2. A method according to claim 1, wherein the width of the second portion of the upper magnetic core is a first portion.
2. The magnetic recording / reproducing head according to claim 1, wherein the width is larger than the width of the portion. 3. The magnetic recording / reproducing head according to claim 2, wherein the thickness of the second portion of the upper magnetic core is larger than the thickness of the first portion. 4. The film according to claim 1, wherein the first portion of the upper magnetic core is formed of a laminated film, and a film closer to the recording gap is a film having a higher saturation magnetic flux density than the remaining films. 4. The magnetic recording / reproducing head according to any one of 1 to 3. 5. The magnetic recording / reproducing head according to claim 1, wherein a saturation magnetic flux density of the first portion of the upper magnetic core is larger than that of the second portion. 6. The magnetic head according to claim 1, wherein the second portion of the upper magnetic core has a higher specific resistance than the first portion.
4. The magnetic recording / reproducing head according to any one of items 1 to 3. 7. A magnetic reproducing head, comprising: a magnetic recording head formed on the magnetic reproducing head, wherein the magnetic recording head includes a lower magnetic core and at least an upper surface of the lower magnetic core facing a recording medium. A recording gap film formed on the lower magnetic core, a coil formed on an opposite side to the recording medium facing surface of the lower magnetic core with an insulating film interposed therebetween, and a recording gap film formed on the coil with an insulating film interposed therebetween. An upper magnetic core connected to the lower magnetic core on the side opposite to the recording medium facing surface, the upper magnetic core being formed on the recording medium facing surface and facing the lower magnetic core. The upper magnetic core is at least exposed to the recording medium facing surface and has a first portion that determines the recording track width, and a first portion that is not exposed to the recording medium facing surface and has a larger cross-sectional area than the first portion. Is Magnetic recording and reproducing head and having a second portion of the recording medium facing surface than the point of Tohaito = 0. 8. The width of a second portion of the upper magnetic core is a first portion.
8. The magnetic recording / reproducing head according to claim 7, wherein the width is larger than the width of the portion. 9. The magnetic recording / reproducing head according to claim 8, wherein the thickness of the second portion of the upper magnetic core is larger than the thickness of the first portion. 10. A method according to claim 1, wherein the first portion of the upper magnetic core is formed of a laminated film, and a film near the recording gap is a film having a higher saturation magnetic flux density than the remaining films. 10. The magnetic recording / reproducing head according to any one of 7 to 9, 11. The magnetic recording / reproducing head according to claim 7, wherein a saturation magnetic flux density of the first portion of the upper magnetic core is larger than that of the second portion. 12. The magnetic recording / reproducing head according to claim 7, wherein a specific resistance of the second portion of the upper magnetic core is larger than that of the first portion.