JPH06195639A - Magnetic conversion element, magnetic head and its production - Google Patents

Abstract

PURPOSE:To eliminate the deviation in core members in a conversion gap and to improve a yield. CONSTITUTION:A head core 1 has the two core members 10, 20. The two core members 10, 20 are joined by facing each other in a front part 5 and a rear part 6 so as to form a winding space 4. A conversion gap film 2 is disposed between the two core members 10 and 20 in the front part 5 and constitutes the conversion gap on a front end face 51 constituting a medium-facing surface. The front pat 5 is so notched that at least one side end face of side end faces 53, 53 intersecting with the track width direction of the front end face 51 is continuous at the conversion gap. The front end face 51 is formed to the width smaller than the width of the rear part 6. A coil is wound around the core members 10, 20 in the winding space 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic conversion element having high-density recording and high-speed response, a magnetic head, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, as a magnetic disk head, a laminated magnetic head has been used in order to cope with high density recording and high speed response. This laminated magnetic head has a magnetic conversion element. As shown in FIG. 11, the magnetic conversion element includes a head core 1, a conversion gap film 2, and a coil (not shown). The head core 1 has two core members 10 and 20, and the two core members 10 and 20 are joined facing each other at a front portion 5 and a rear portion 6 so as to form a winding space 4. The conversion gap film 2 is arranged between the two core members 10 and 20 in the front portion 5, and forms a conversion gap on the tip end surface 51 that forms the medium facing surface. The core members 10 and 20 are made of the soft magnetic metal film 11
0 and 210 are sandwiched by non-magnetic materials 120 and 220.
The coil is wound around the core members 10 and 20 in the winding space 4 (not shown).

[0003]

In such a conventional magnetic head, as shown in FIG. 11, in a magnetic conversion element, two core members 10 and 20 are joined to each other so as to form a winding space 4. At this time, the soft magnetic metal films 1 of the core members 10 and 20 facing each other at the conversion gap position.
Since the 10 and 210 are displaced and joined together, the width of the conversion gap for writing or reading changes, and the track width of the medium cannot be correctly met. Therefore, from the viewpoint of reliability in writing or reading, a product in which the core member is displaced by more than a predetermined length is regarded as a defective product. In recent years, since the magnetic head has been compatible with high-density recording and high-speed response, the amount of deviation of the core member has become strict.
Yields decreased due to frequent defects. Therefore, there is a problem that the cost is increased.

Therefore, an object of the present invention is to provide a magnetic conversion element, a magnetic head and a method of manufacturing the same which can eliminate the deviation of the core member in the conversion gap and improve the reliability and the yield.

[0005]

To solve the above problems, the present invention is a magnetic head having a magnetic conversion element, the magnetic conversion element including a head core, a conversion gap film, and a coil. The head core has two core members, and the two core members are joined to face each other in a front portion and a rear portion so as to form a winding space, and the conversion gap film is formed in the front portion. In the above, the conversion gap is formed on the front end surface that is disposed between the two core members and that forms the medium facing surface, and the front portion is
At least one side end face of the side end faces intersecting with the track width direction of the tip end face is cut out so as to be continuous in the conversion gap, and the width of the tip end face is smaller than the width of the rear part. Is wound around the core member in the winding space.

A magnetic head according to the present invention is a combination of the magnetic conversion element described above and a slider.

Further, the present invention is a manufacturing method for manufacturing a magnetic conversion element or a magnetic head, wherein two core members are opposed to each other at a front portion and a rear portion so as to form the winding space and are joined together. Next, at least one side end face of the side end faces intersecting the track width direction of the tip end face is continuous in the conversion gap, and the width of the tip end face is smaller than the width of the rear part. Grind.

[0008]

In the magnetic conversion element, the head core has two core members, and the two core members are joined to face each other at the front and rear portions so as to form a winding space.
It is possible to obtain a magnetic conversion element and a magnetic head in which winding is performed using a winding space.

The conversion gap film is arranged between two core members facing each other in the front portion, and forms a conversion gap on the tip end surface that constitutes the medium facing surface, and the core member is the track width of the tip end surface. Since at least one side end face of the side end faces intersecting the direction is cut out so as to be continuous in the conversion gap, the positional deviation of one side end face of at least two core members is absorbed by the cutout. Therefore, the deviation between the width of the conversion gap for writing or reading and the track width of the medium is absorbed, and the reliability of writing or reading a signal on the magnetic recording medium is increased,
It improves the yield of the magnetic head and lowers the cost.

Since the front portion is cut out so as to be continuous with the conversion gap and the width of the front end surface is smaller than the width of the rear portion, it can be cut out by, for example, cutting using a grindstone, and the manufacturing is easy. Is.

In a preferred embodiment, the notched side end surface has an inclined surface, and the inclined surface forms an angle of 20 to 70 degrees. With such a configuration, it is possible to prevent leakage magnetic flux from the tip surface.

The core member may be a laminated body in which a nonmagnetic material is bonded to one surface of a soft magnetic metal film, or a laminated body in which a nonmagnetic material is bonded to both surfaces of a soft magnetic metal film. With such a configuration, the magnetic path can be configured only by the soft magnetic metal, and by thinning the soft magnetic metal, high density recording can be achieved.

[0013]

FIG. 1 is a perspective view of a magnetic conversion element according to the present invention,
FIG. 2 is a front view of the magnetic conversion element shown in FIG. In the figure, 1 is a head core, 2 is a conversion gap film, and 3 is a coil.

The head core 1 has two core members 10 and 2.
0, and the two core members 10 and 20 have a winding space 4
To face each other so that the front portion 5 and the rear portion 6 face each other, and they are joined together using the fused glass 30. In the figure,
Each of the core members 10 and 20 has a soft magnetic metal film 11 respectively.
It is composed of a laminated body in which non-magnetic materials 120 and 220 are bonded to both surfaces of 0 and 210. Non-magnetic material 120, 22
0 consists of ceramic material or amorphous or crystalline glass. The winding space 4 is formed by the recesses 101 and 201 provided in the core members 10 and 20. Since the fused glass 30 joins the core member 10 and the core member 20, the joining strength between the two is increased.

The conversion gap film 2 is disposed between the two core members 10 and 20 in the front portion 5 and forms a conversion gap on the tip end surface 51 that forms the medium facing surface. The conversion gap film 2 can be formed as a glass sputtered film.

At least one of the side end surfaces of the front portion 5 which intersects the track width direction of the front end surface 51 is cut out so as to be continuous with the conversion gap, and the width of the front end surface 51 is smaller than the width of the rear portion 6. Is also getting smaller. In the figure, the front part 5
Has both end faces 52, 53 cut out. The notched side end surfaces 52 and 53 have inclined surfaces, and the inclined surfaces have an angle θ of 20 degrees to 70 degrees.

The coil 3 has a core member 1 in the winding space 4.
It is wound around 0 and 20. The coil 3 includes a core member 10,
It may be wound on only one of the 20.

As described above, in the magnetic conversion element, the head core 1 has the two core members 10 and 20, and the two core members 10 and 20 form the winding space 4, so that the front portion 5 and the rear portion 6 are formed. Since they are opposed to each other and are joined together, a magnetic conversion element and a magnetic head of the type in which winding is performed using the winding space 4 can be obtained.

The conversion gap film 2 is disposed between the two core members 10 and 20 facing each other in the front portion 5, and forms a conversion gap on the tip end surface 51 that forms the medium facing surface. At least one of the side end surfaces 52, 53 of the tip end surface 51 that intersects the track width direction of the tip end surface 51 is notched so as to be continuous with the conversion gap, so at least two core members 10, 20 are provided.
The positional deviation of the one side end face is absorbed by the notch. For this reason, the deviation between the width of the conversion gap for writing or reading and the track width of the medium is absorbed, the reliability of writing or reading signals on the magnetic recording medium is increased, the yield is improved, and the cost is reduced.

The front portion 5 is cut out so as to be continuous with the conversion gap, and the width of the front end surface 51 is smaller than the width of the rear portion 6. Therefore, the front portion 5 can be cut out by cutting using a grindstone, for example. , Easy to manufacture.

In the preferred embodiment, the notched side end surfaces 52, 53 have inclined surfaces, and the inclined surfaces have an angle of 20 to 70 degrees, so that leakage flux from the tip surface 51 is prevented. be able to.

The core members 10 and 20 are made of a soft magnetic metal film 11.
0, 210 is a laminated body in which the non-magnetic material 120, 220 is bonded to one surface, or the soft magnetic metal film 110, 2
Since it is a laminated body in which the non-magnetic materials 120 and 220 are bonded to both surfaces of 10, the magnetic path can be constituted only by the soft magnetic metal, and by thinning the soft magnetic metal, high density recording can be achieved.

3 to 5 are perspective views showing another embodiment of the magnetic conversion element according to the present invention. In each of the magnetic conversion elements shown in FIGS. 3 to 5, the head core 1 has two core members 10 and 20, and the soft magnetic metal films 110 and 210 are formed of nonmagnetic materials 120 and 220, respectively. It is formed of a sandwiched laminated body, and the front portion 5 and the rear portion 6 face each other so as to form the winding space 4 and are joined together by the fused glass 30. The conversion gap film 2 is arranged between the two core members 10 and 20 in the front portion 5, and forms a conversion gap on the tip end surface 51 that forms the medium facing surface. Coil 3
Is wound around the core members 10 and 20 in the winding space 4.

In the embodiment shown in FIG. 3, the front portion 5 has a tip surface 51.
Only the side end surface 52 intersecting with the track width direction is cut out at an angle of 20 to 70 degrees so as to be continuous in the conversion gap, and the width of the front end surface 51 is smaller than the width of the rear portion 6.

In the embodiment of FIG. 4, the front portion 5 has a tip surface 51.
Side end surfaces 52 and 53 intersecting the track width direction of the soft magnetic metal films 110 and 210 and the side end surface 5 of the welded glass 30.
2, 53, and these side end faces 52, 5
3 is cut vertically so that it is continuous in the conversion gap,
The width of the front end surface 51 is smaller than the width of the rear portion 6.

In the embodiment of FIG. 5, the front portion 5 has a front end surface 51.
Of the soft magnetic metal 110, 210 and the welded glass 30, and the side end face 52 is notched vertically so as to be continuous in the conversion gap, and the width of the front end face 51 is increased. Is smaller than the width of the rear portion 6.

Next, the magnetic head according to the present invention will be described.

FIG. 6 is a perspective view of a magnetic head in which one of the two core members of the magnetic conversion element constitutes a slider. This type is called a Winchester type magnetic head. The magnetic conversion element is of the type shown in FIG. In the figure, the same reference numerals as those in FIGS. 1 to 5 denote the same components. Reference numeral 8 is a slider. Each of the core members 10 and 20 constituting the head core 1 is a laminated body in which the nonmagnetic materials 120 and 220 are bonded to both surfaces of the soft magnetic metal films 110 and 210. The core member 20 constitutes the slider 8. The magnetic conversion element having such core members 10 and 20 is provided on one end side of the slider 8 in the medium outflow direction A.

FIG. 7 is a perspective view of another Winchester type magnetic head. In the figure, the same reference numerals as those in FIGS. 1 to 6 denote the same components. The magnetic conversion element has the same structure as the magnetic conversion element shown in FIG. The core member 20 forming the magnetic conversion element is provided as a part of the slider 8. This magnetic conversion element
It is provided on a side surface of the slider 8 which intersects with one end side in the medium outflow direction A.

FIG. 8 is a perspective view of a magnetic head in which the magnetic conversion element shown in FIG. 4 is embedded in a slider. This type of type is called a composite type magnetic head. In the figure, the same reference numerals as those in FIGS. 1 to 7 denote the same components. This magnetic head is shown in FIG.
The magnetic conversion element shown in FIG.
Is embedded in one end side of and the periphery is fixed by a welding glass 60. The type shown in FIGS. 1 to 3 can also be used for the magnetic conversion element of the composite type magnetic head.

Next, a method of manufacturing the magnetic head according to the present invention will be described.

As shown in FIG. 9, the two core members 10,
20 to form a winding space 4 in front 5 and rear 6
Face each other and join. As for the method of joining, the welding glass 30 is put into a joining space 40 formed when the core members 10 and 20 are opposed to each other and they are joined to each other. By doing so, the bonding strength between the both 10 and 20 is increased.

Then, as shown in FIG. 10, by moving the grindstone rotating in the direction of arrow b in the direction of arrow a,
Side end faces 2 and 53 that intersect with the track width direction of the front end face 51.
At least one of the end faces is continuous in the conversion gap,
Also, grinding is performed so that the width of the front end surface 51 is smaller than the width of the rear portion 6. Other grinding methods include ion milling and laser irradiation. Grinding with a grindstone is superior to other ion milling, laser irradiation, and other grinding processes because it has a good workability because it is a linear process, has a smooth ground surface, and does not damage the magnetic recording medium.

[0034]

As described above, according to the present invention, the following effects can be obtained. (A) The magnetic conversion element uses the winding space because the head core has two core members and the two core members are joined to face each other at the front and rear portions so as to form the winding space. It is possible to provide a magnetic conversion element and a magnetic head of the type in which the winding is applied. (B) The conversion gap film is arranged between two core members facing each other in the front portion, and forms the conversion gap on the tip surface that constitutes the medium facing surface, and the core member is the track width of the tip surface. Since at least one side end face of the side end faces intersecting the direction is cut out so as to be continuous in the conversion gap, the positional deviation of one side end face of at least two core members is absorbed by the cutout. Therefore, it is possible to provide a magnetic conversion element that increases the reliability of writing or reading a signal to or from the medium, improves the yield of the magnetic head, and lowers the cost. (C) The front portion is cut out so as to be continuous with the conversion gap, and the width of the front end surface is smaller than the width of the rear portion. Therefore, for example, the cutting can be performed by cutting using a grindstone. An easy magnetic conversion element can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic conversion element according to the present invention.

FIG. 2 is a front view of the magnetic conversion element shown in FIG.

[Figure 3]

FIG. 5 is a perspective view showing another embodiment of the magnetic conversion element according to the present invention.

6 is a perspective view of a magnetic head in which one of the two core members included in the magnetic conversion element shown in FIG. 1 constitutes a slider.

FIG. 7 is a perspective view of another magnetic head.

8 is a perspective view of a composite type magnetic head in which the magnetic conversion element shown in FIG. 4 is embedded in a slider.

FIG. 9

FIG. 10 is a diagram showing a method of manufacturing the magnetic conversion element shown in FIG. 1.

FIG. 11 is a diagram illustrating a shift of a conversion gap that occurs in a conventional magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head core 10 and 20 Core member 2 Conversion gap film 3 Coil 4 Wire-winding space 5 Front part 6 Rear part 30 and 60 Adhesive glass 40 Bonding space 11 and 21 Soft magnetic metal film 12 and 22 Non-magnetic body 51 Tip surface 52 and 53 Side end surface 101, 102 Recess

Claims (14)

[Claims] 1. A magnetic conversion element including a head core, a conversion gap film, and a coil, wherein the head core has two core members, and the two core members form a winding space. The front and rear portions are joined to face each other, and the conversion gap film is arranged between the two core members in the front portion and forms a conversion gap on a front end surface that constitutes a medium facing surface. The front portion is notched so that at least one side end face of the side end faces intersecting the track width direction of the tip end face is cut out so as to be continuous in the conversion gap, and the width of the tip end face is larger than the width of the rear part. The magnetic conversion element, which is small and is wound around the core member in the winding space. 2. The front portion is notched on one side of a side end surface that intersects the track width direction of the tip end surface.
The magnetic conversion element described in 1. 3. The front portion is notched on both sides of a side end surface that intersects the track width direction of the tip end surface.
The magnetic conversion element described in 1. 4. The magnetic conversion element according to claim 1, wherein the notched side end surface has an inclined surface, and the inclined surface has an angle of 20 to 70 degrees. 5. The magnetic conversion element according to claim 1, wherein the notched side end surface has a vertically notched slant surface. 6. The magnetic conversion element according to claim 1, wherein the core member is a laminated body of a soft magnetic metal film and a non-magnetic material, and the soft magnetic metal film is cut out. 7. The magnetic material according to claim 6, wherein the core member is a laminated body in which the non-magnetic material is bonded to one surface of the soft magnetic metal film, and at least the soft magnetic metal film is cut out. Conversion element. 8. The magnetic conversion according to claim 6, wherein the core member is a laminated body in which the non-magnetic material is bonded to both surfaces of the soft magnetic metal film, and at least the soft magnetic metal film is cut out. element. 9. A magnetic head having a magnetic conversion element and a slider, wherein the magnetic conversion element is any one of claims 1 to 8, wherein the slider supports the magnetic conversion element. Magnetic head. 10. The magnetic head according to claim 9, wherein one of the two core members constitutes a slider, and the magnetic conversion element is provided on one end side of the slider in the medium outflow direction. 11. The magnetic element according to claim 9, wherein one of the two core members constitutes a slider, and the magnetic conversion element is provided on a side surface crossing one end side of the slider in a medium outflow direction. Magnetic head 12. The magnetic head according to claim 9, wherein the magnetic conversion element is embedded in one end side of the slider in the medium outflow direction. 13. A manufacturing method for manufacturing the magnetic conversion element according to any one of claims 1 to 8 or the magnetic head according to claims 9 and 10, wherein two core members are provided in the winding space. The front part and the rear part are opposed to each other so as to be formed, and then, at least one side end face of the side end faces intersecting with the track width direction of the tip end face is continuous in the conversion gap, and A method of manufacturing a magnetic conversion element or a magnetic head, which comprises grinding so that a width of a front end surface is smaller than a width of the rear portion. 14. The method of manufacturing a magnetic conversion element according to claim 13, wherein the one end face is ground with a grindstone.