JPH04103363U - magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to improve the recording and reproducing characteristics of a magnetic head mounted on a hard disk drive, and to facilitate design and manufacture. [Structure] A slider 22, a magnetic head core 21 made of ferrite, a metal magnetic film 23 formed on the abutting surface of the slider 22 and the magnetic head core 21 and forming a magnetic circuit together with the magnetic head core 21, the slider 22 and the magnetic head core 21 and a gap material 24 interposed between the magnetic head and the gap material 24 forming a magnetic gap, the slider 22 is made of a non-magnetic material, and the metal magnetic film 23 is formed on the slider 22. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to magnetic heads, particularly magnetic heads installed in hard disk drives. Regarding.

0002

[Conventional technology]

Hard disk drives are generally used as storage devices for computers, word processors, etc. Live equipment is known. Conventionally, this hard disk drive device was equipped with Figure 4 shows the structure of the magnetic head.

0003 The magnetic head 1 shown in the figure is of the so-called monolithic type. A magnetic metal-in-gap structure in which a metal magnetic film is placed in the gap-forming part. It's a mind head. In the figure, 2 is the magnetic head core, and 3 is the magnetic head located on the disk surface. The slider is a part of the core used to levitate the (e.g.). Also, on the abutting surface between the magnetic head core 2 and the slider 3, Metal magnetic films 4 and 5 such as Sendust (registered trademark) are formed (either one There is also a structure in which only the metal magnetic films 4 and 5 are formed). This metal magnetic film The magnetic head core 2 and the slider 3 in which the numbers 4 and 5 are formed are made of a non-magnetic material. They are butted against each other and fixed with a plastic plate 6 interposed therebetween.

0004 Furthermore, the magnetic head 7 shown in FIG. 5 is of a so-called composite type. This magnetic head 7 is also a magnetic head with a metal-in-gap structure. In the figure, 8 is a magnetic head section, and 9 is a slider. Magnetic head section 8 is enlarged in Figure 6 As shown, the first magnetic head core 10 and the second magnetic head core 11 have The abutment surface of each magnetic head core 10, 11 has a sender Metal magnetic films 12 and 13 such as There is also a structure in which only the films 12 and 13 are formed). This pair of magnetic head cores 10 and 11 are butted together with a glass material 14 serving as a gap material interposed therebetween. The magnetic head section 8 is fixed by the material 14.

[0005] The slider 9 is made of ceramic and slides over the magnetic head on the magnetic disk. An air escape groove 15 is formed so that 7 can float. Further, the magnetic head section 8 is arranged A groove-shaped mounting portion 16 is formed at the position where the mounting portion 16 is provided. The magnetic head section 8 is It has a configuration in which it is mounted on the mounting part 16 and then fixed to the slider 9 with a glass material 17. It has become.

[0006]

[Problem that the idea aims to solve]

Among the conventional magnetic heads described above, the monolithic type magnetic head 1 is The magnetic head core 2, slider 3, and metal magnetic films 4 and 5 are in contact with each other near the gap. A matching boundary (indicated by arrows A and B in FIG. 4) is formed. These boundary parts A and B are , it may function as a pseudo gap, which may deteriorate the recording and playback characteristics. There was an issue.

[0007] In addition, in the composite type magnetic head 7, the above-mentioned monolithic type magnetic head 7 In addition to the deterioration of recording and reproducing characteristics due to the pseudo gap as with Head 1, the following There is a problem. That is, in the composite type magnetic head 7, the first and second A first glass material 14 and a second glass material are used to join the magnetic head cores 10 and 11. 17 and which joins the first and second magnetic head cores 10 and 11. The melting point of the glass material 14 of It is necessary to select a material whose melting point is higher than that of the material 17. Also, glass with a very high melting point If a base material is used, the magnetic properties of the metal magnetic films 12 and 13 may deteriorate. Are known. Therefore, in the composite type magnetic head 7, the first and second It became difficult to select glass materials 14 and 17, and there were various restrictions in terms of design and manufacturing. There was a problem that

[0008] The present invention was developed in view of the above points, and is believed to improve the recording and reproducing characteristics. It is an object of the present invention to provide a magnetic head that can be designed and manufactured easily.

[0009]

[Means to solve the problem]

In order to solve the above problems, in this invention, A slider, a magnetic head core made of ferrite, and a combination of the slider and magnetic head. The metal that is formed on the abutting surface with the magnetic head core and forms the magnetic circuit together with the magnetic head core. A magnetic film is interposed between the slider and the magnetic head core to form a magnetic gap. In a magnetic head composed of a gap material and a gap material, the slider is The slider is made of a magnetic material, and the metal magnetic film is formed on a slider. It is something that

0010

[Effect]

According to the magnetic head having the above structure, the metal magnetic film is a non-magnetic member, such as a slider. The boundary between the two does not function as a pseudo gap. child Therefore, deterioration of recording and reproducing characteristics can be prevented. In addition, the magnetic circuit The magnetic circuit inductor is composed only of a head core and a metal magnetic film. It is possible to reduce the

[0011]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings. Figure 1 shows an example of the present invention. FIG. 2 is a perspective view showing a certain magnetic head 20. FIG. The magnetic head 20 shown in the figure is a hardware It is installed in a hard disk drive device, and the hard disk is used during recording and playback. The rotation of the disk causes it to rise slightly above the disk surface, and recording and playback processing is performed in this state. This is a magnetic head. Further, this magnetic head 20 has a metal magnetic material near the gap. This is a so-called metal-in-gap type magnetic head in which a film is formed.

0012 The magnetic head 20 shown in the figure includes a magnetic head core 21, a slider 22, a metal It is composed of a magnetic film 23 and a gap material 24.

[0013] The magnetic head core 21 is made of ferrite, and the coil winding 25 is made of ferrite. As shown in the figure, the shape is approximately C-shaped when viewed from the side. has been done. Also, the top surface in the figure is the surface facing the hard disk, but the magnetic head The width dimension of the facing surface 26 where the hard disk 21 faces the hard disk is equal to the track width. It is configured so that

[0014] The slider 22, which is a feature of the present invention, is made of potassium titanate or barium titanate. The top surface (the surface facing the hard disk) is made of ceramic made from aluminum, etc. Air escape grooves 27 and 28 are provided for floating the magnetic head 20 during recording and reproduction. It is formed. Further, the magnetic head core 21 butts against the side surface of the slider 22. A metal magnetic film 23 having high magnetic permeability, such as sendust, is formed at the location where the magnetic material is rubbed. It is. The magnetic head core 21 has a gap material 24 interposed therebetween, which is a non-magnetic material. The metal magnetic film 23 is pressed against the slider 22 by the glass material 29. The magnetic head 20 is thus formed.

[0015] As shown in FIG. 2(A), the magnetic head 20 having the above configuration has a metal magnetic film 2 3 is formed on the slider 22, which is a non-magnetic material, so that the slider 22 and the metal magnetic A pseudo gap is not formed at the boundary with the sexual body membrane 23 (indicated by arrow C in the figure). do not have. Therefore, in the magnetic head 20, the characteristics caused by the pseudo gap occur during recording and reproducing processing. No deterioration in performance occurs, and good magnetic recording and reproducing processing can be performed.

[0016] The magnetic head 20 is also lighter in weight than the conventional magnetic head 1 (see FIG. 4). Accordingly, the magnetic recording and reproducing characteristics can be improved. Below, this The reason for this will be explained. Slider 22 accounts for most of the weight of magnetic head 20 is made of ceramic. The specific gravity of this ceramic is smaller than that of ferrite. Therefore, assuming magnetic heads with the same volume, the magnetic head 20 according to the present application The weight of the magnetic head 1 can be reduced compared to that of the conventional magnetic head 1.

[0017] In recent years, electronic devices equipped with hard disk drives (for example, word processors) (servers, etc.) are becoming smaller, and along with this, hard disk drives are becoming smaller. It is. In addition, in recent years, magnetic recording density has become more advanced, and track widths have become narrower. It has become to. For this reason, the magnetic heads installed in hard disk drives are also small. There are efforts being made to

[0018] On the other hand, as is well known, the magnetic head installed in a hard disk device is capable of recording and reproducing information. Sometimes, due to the rotation of the hard disk, due to the protection of the magnetic head, etc. It is configured to float slightly. This flying height has a large effect on the recording and reproducing characteristics. Therefore, it is necessary to specify it with high precision. Also, this flying height is determined by the area of the slider (disc The larger this area is, the stronger the levitation force will be; The upper volume also becomes smaller. However, as magnetic heads have become smaller in recent years, the slide The area of the dam becomes smaller and the levitation force also becomes smaller. For this reason, the magnetic head is Equipped with recent hard disk drives, it is possible to raise the surface to a position where the operation can be performed well. This has become one of the problems with magnetic heads.

[0019] However, as described above, in the magnetic head 20 of the present invention, the slider 22 is By constructing a non-magnetic material (ceramic) that is lighter than a light, the magnetic head 20 was able to be made lighter. Therefore, by downsizing the magnetic head 20, the slurry Even if the area of the guide 22 is small and the levitation force is small, the magnetic head 20 is light, so The magnetic head 20 can be levitated to a predetermined position with a small levitation force. This structure As a result, even a miniaturized magnetic head 20 can have good magnetic recording and reproducing characteristics. It became possible to maintain the

[0020] Further, as shown in FIGS. 2(A) and 2(B), the magnetic circuit of the magnetic head 20 A magnetic head core 21 made of ferrite, a metal magnetic film 23, and a gap material 24 Since the slider 22 is made of a non-magnetic material, it does not constitute a magnetic circuit. For this reason, like the conventional slider 9, the slider constitutes a magnetic circuit. Compared to 1, the inductance of the magnetic circuit can be reduced, improving responsiveness. However, it can also fully support high-speed transfer.

[0021] The magnetic head 20 according to the present application is a so-called metal-in-gap type magnetic head. Since it is a metal-in-gap head, the magnetic head 20 naturally has the characteristics of a metal-in-gap head. This improves the saturation magnetization and increases the recording density due to the steepness of the generated magnetic flux. Densification etc. can also be realized.

[0022] FIG. 3 is a diagram for explaining a method of manufacturing the magnetic head 20. As shown in FIG. magnetic head 20 In order to manufacture the slider 22, as shown in FIG. A slider block 29 and a ferrite core block that becomes the magnetic head core 21. Prepare ku30. Next, as shown in FIG. 3B, the core block 30 is Then, the coil winding groove 25 is formed by cutting. Also, as shown in the same figure (C) In addition, for the slider block 29, there is a A metal magnetic film 23 such as sendust is sputtered to have a constant film thickness. Slider block 29 and metal magnet in which coil winding groove 25 is formed as described above As shown in FIG. A gap material 24 is interposed at the cap forming position, and the glass material 31 are joined together. When manufacturing the magnetic head 20, only one type of glass material 31 is used. Therefore, there is no difficulty in selecting the glass material 31. Next, While removing unnecessary parts of the block 30, the slider block 29 is placed in a predetermined position. Air escape grooves 27 and 28 are formed in the magnetic head 20 shown in FIG. Ru. In the series of methods for manufacturing the magnetic head 20 described above, the slider block 29 is made of metal. The manufacturing method of the conventional magnetic head is the same except that the magnetic film 23 is sputtered. 1, to manufacture the magnetic head 20 without making major changes to the manufacturing equipment. I can do it. Also, as mentioned above, when selecting the glass material 31, consider the melting point, etc. Therefore, the magnetic head 20 can be designed and manufactured easily.

[0023] In the above embodiment, the metal magnetic film 23 is formed only on the slider 22. However, the present invention is not limited to this, and the butt surface of the magnetic head core 21 Alternatively, a metal magnetic film may be formed. In this configuration, the magnetic head core 2 1 and the metal magnetic film formed on this magnetic head core 21. However, compared to conventional magnetic heads, the magnetic recording and reproducing characteristics are can improve sex.

[0024] In addition, in the manufacturing method explained using FIG. 3, the slider tab shown in FIG. A metal magnetic film 23 is sputtered on the surface of the lock 29 where the core block 30 is to be joined. In the above embodiment, the metal magnetic film 23 is sputtered over the entire bonding surface. However, in order to improve manufacturing efficiency, one slider block and When trying to manufacture a large number of magnetic heads from a core block (so-called When performing individual cutting), after sputtering the metal magnetic film, the magnetic head A structure in which the part that matches the core is left and the other part is removed by etching. May be completed. When performing this etching, the dimensions of the remaining portion of the metal magnetic film are carefully controlled. By closely defining the gap, it is possible to realize a magnetic head with a narrow gap and high recording density. Both are possible.

[0025]

[Effect of the idea]

As mentioned above, according to the present invention, since the metal magnetic film is formed on the non-magnetic member, both Since the boundary between the two does not function as a pseudo gap, deterioration of recording and playback characteristics is prevented. The magnetic circuit consists only of the magnetic head core and metal magnetic film. By doing so, the inductance of the magnetic circuit can be reduced, and the responsiveness can be improved. It has features such as being able to improve performance.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head that is an embodiment of the present invention.

FIG. 2A is a plan view of a magnetic head that is an embodiment of the present invention, and FIG. 2B is a side view of a magnetic head that is an embodiment of the present invention.

FIG. 3 is a diagram for explaining a method of manufacturing a magnetic head, which is an embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional monolithic type magnetic head.

FIG. 5 is a diagram showing an example of a conventional composite type magnetic head.

FIG. 6 is an enlarged view showing the vicinity of the gap of the magnetic head shown in FIG. 5;

[Explanation of symbols]

20 Magnetic head 21 Magnetic head core 22 Slider 23 Metal magnetic film 24 Gap material 27, 28 Air escape groove 29 Slider block 30 core block

Claims (1)

[Scope of utility model registration request] 1. A slider, a magnetic head core made of ferrite, a metal magnetic film formed on the abutting surfaces of the slider and the magnetic head core and forming a magnetic circuit together with the magnetic head core, and between the slider and the magnetic head core. 1. A magnetic head comprised of a gap material interposed therebetween to form a magnetic gap, characterized in that the slider is comprised of a non-magnetic member, and the metal magnetic film is formed on the slider.