JPH01245408A - Magnetic head and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in a magnetic recording/reproducing device that reads data from or writes data to a magnetic recording medium, and a method for manufacturing the same. be.

BACKGROUND TECHNOLOGY Magnetic recording and reproducing devices are used in a wide range of fields for the purpose of storing images, data, etc., and in recent years, there has been significant progress in miniaturization and higher density. Many improvements have been made to magnetic recording media and magnetic heads in order to achieve smaller size and higher density. In magnetic recording media, technology for increasing coercive force and thinning the film has progressed, and thin-film magnetic recording media made of ferromagnetic metal materials such as Co-Ni using vacuum thin film technology such as sputtering, and ferromagnetic metals such as Fe, Co, and Ni have been developed. Powder-coated metal-coated magnetic recording media have been proposed. The coercive force of these magnetic recording media is two to four times higher than that of recording media coated with oxides such as Fe, which have been mainly used in the past, and enable recording and reproduction of signals in a high frequency range. On the other hand, magnetic heads
In order to perform saturation recording on a magnetic recording medium having a high coercive force, a technique has been proposed in which the vicinity of the magnetic gap of a magnetic head is formed using a metallic magnetic material having a high saturation magnetic flux density.

FIG. 6 is an enlarged plan view showing a conventional magnetic head. In FIG. 6, 1 is a non-magnetic substrate, 2 is a metal magnetic film formed on the non-magnetic substrate 1, and the metal magnetic film 2 is an amorphous magnetic film made of Fe-Al-3i composite having a high saturation magnetic flux density. It is formed by sputtering a material, etc. Further, the thickness of the metal magnetic film 2 is formed to be equal to the desired track width. Reference numeral 3 denotes a cover material made of the same material as the non-magnetic substrate 1, and the cover material 3 is adhered onto the metal magnetic film 2. 4 is a magnetic gap. The part of the back core where the winding is applied also has a structure in which a metal magnetic film is sandwiched between a nonmagnetic substrate and a cover material, as shown in FIG.

A method of manufacturing the conventional magnetic head configured as described above will be explained. First, a metal magnetic film 2 is formed on a nonmagnetic substrate 1. At this time, the thickness of the metal magnetic film 2 is formed to be equal to the track width. Next, the cover material 3 is adhered onto the metal magnetic film 2. Next, the two core bodies configured in this way are butted together so that the metal magnetic films 2 are facing each other,
Bonded via a nonmagnetic film. In a magnetic head having this structure, the thickness of the metal magnetic film 2 corresponds to the track width, so it is easy to manufacture a magnetic head with a narrow track width of about 10 micrometers.

FIG. 7 is an enlarged plan view showing another conventional magnetic head. In FIG. 7, 5 is a magnetic core formed of an oxide magnetic material, 6 is a metal magnetic film formed on the magnetic core 5, and the metal magnetic film 6 is Fe-A having a high saturation magnetic flux density.
It is formed by sputtering l-3i alloy, amorphous magnetic material, etc.

7 is a magnetic gap, 8 is a regulation groove for regulating the width of the magnetic gap, and regulation groove 8 is filled with glass.

A method of manufacturing the magnetic head constructed as described above will be explained.

First, two core bodies with a metal magnetic film 6 formed on one surface of a magnetic core 5 are created, and the two core bodies are joined via a nonmagnetic film so that the metal magnetic film 6 faces each other.

Finally, after forming a regulating groove 8 for regulating the width of the magnetic gap 7, the regulating groove 8 is filled with glass. Since the gap forming surface is formed of the metal magnetic film 6, the recording and reproducing ability of the magnetic head is excellent.
It was micrometer thin (but good), so it was excellent for mass production.

Problems to be Solved by the Invention However, in the conventional configuration shown in FIG. 6, the part where the winding is applied is formed of a metal magnetic film, so when trying to generate magnetic flux in the winding and flowing it through the magnetic circuit, However, since the metal magnetic film is a thin film, it has high magnetic resistance (which tends to reduce the efficiency of the magnetic head.Also, the thickness of the metal magnetic film 6 determines the track width, so if you try to create a magnetic head with a wide track width) However, since it takes time to form a thin film, it is difficult to improve mass productivity.In addition, in the conventional configuration shown in FIG. Since the bonding surface becomes parallel to the magnetic gap, the bonding surface becomes a pseudo gap.In order to prevent the occurrence of such a pseudo gap, the bonding surface of the metal magnetic film and the core body is made to be non-parallel to the magnetic gap. It is also possible to form a

However, such a special configuration requires complicated processing steps and is not suitable for mass production. In addition, since the oxide magnetic material used for the magnetic core 5 is generally brittle, cracks occur in the magnetic core due to the internal stress of the metal magnetic III 6 and high-temperature heat treatment during the formation of the magnetic cap 7, resulting in poor magnetic efficiency and an increase in yield. The problem was that it was difficult to

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic head that does not reduce magnetic efficiency and is excellent in mass productivity, and a method for manufacturing the same.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention has two blocks in which a metal magnetic film is formed on a non-magnetic material, and the blocks are connected through a magnetic gap so that the metal magnetic films face each other. The connected front core was connected to the back core, and a metal magnetic film was formed up to the joint surface with the back core.

Function: This configuration does not increase the magnetic resistance of the portion where the winding is applied, and can prevent the occurrence of pseudo gaps.

Embodiment FIG. 1 is a perspective view showing a magnetic head in an embodiment of the present invention. In FIG. 1, reference numerals 9 and 10 are non-magnetic blocks, and a metal magnetic film 11 is formed on a surface 9a of the non-magnetic block 9 facing the non-magnetic block 10 and a slope 9b adjacent to the facing surface 9a. Similarly, in the non-magnetic block 10, a metal magnetic film 12 is formed on a surface 10a facing the non-magnetic block 9 and a slope 10b adjacent to the surface 10a. Further, grooves are provided on both sides of the non-magnetic blocks 9 and 10 and filled with glass. 13 is a metal magnetic film 11.1
2, adhesive 14 is used to bond the non-magnetic blocks 9 and 10, and 15 is a back core, and the back core 15 has a winding groove for winding. 15a is provided. Further, the non-magnetic blocks 9 and 10 and the back core 15 are connected so that the metal magnetic film 11 and the metal magnetic film 12 are in contact with the back core 15 at a portion separated by the winding groove 15a.

In the magnetic head constructed as described above, the portion where the winding is applied is formed by the back core 15, and has good magnetic efficiency. In addition, since the magnetic circuit is formed only by the metal magnetic films 11 and 12 in the portion near the surface facing the magnetic recording medium, there is no fear that a pseudo gap will occur. The material of the non-magnetic blocks 9, 10 is made to have a strong transverse rupture strength so that cracks do not occur in the non-magnetic blocks 9, 10 due to internal stress generated in the metal magnetic film 11, 12 or stress due to high-temperature heat treatment during gap formation. I can do things. In addition, even if a crack occurs in the non-magnetic block 9, 10, the non-magnetic block 9,
Since No. 10 does not form a magnetic circuit, the magnetic resistance does not increase much and the magnetic efficiency is not affected much.

A method of manufacturing the magnetic head formed as described above will be explained with reference to FIGS. 2 to 5.

After one surface 16a of the non-magnetic block 16 is polished to a mirror surface by lapping or the like, grooves 16b are formed in the one surface 16a using a diamond grindstone or the like. The groove 16b is composed of three surfaces, and the bottom surface is formed parallel to one surface 16a.

Moreover, the -th side surface is formed perpendicularly to the one surface 16a. Further, the second side surface is formed not to be perpendicular to the first surface 16a.

Next, 5 to 2 layers of a metal magnetic film 17 such as Fe-Al-8i is formed on one surface 16a using a vacuum thin film forming technique such as sputtering.
0 micrometer is formed. Next, the non-magnetic block 16
The non-magnetic block 18 is formed in the same process as above. Then, the non-magnetic block 16 and the non-magnetic block 18 are butted together so that the metal magnetic films face each other, with a non-magnetic film such as silicon dioxide or the like serving as a filler for the magnetic gap interposed therebetween. Next, as shown in FIG. 2, adhesive 19 is applied to the second side of groove 16b.
Non-magnetic block 16 at a temperature of 500-750 degrees by
．． 18 is joined. The nonmagnetic blocks 16 and 18 are made of a material that has a coefficient of thermal expansion that is almost the same as that of the metal magnetic film 17, has a strong transverse rupture strength, and has excellent wear resistance. For example, when the metal magnetic film 17 is made of an Fe-Al-3i alloy, the non-magnetic blocks 16 and 18 may be made of ceramic such as barium titanate, crystallized glass, or the like. Next, as shown in FIG. 3, a plurality of regulating grooves 20 defining the gap width 1ti11 are formed perpendicularly to the longitudinal direction of the joint surfaces of the non-magnetic blocks 16, 18, and glass is injected into the regulating grooves 20.

Further, the regulation groove 20 is formed by the non-magnetic block 16 as shown in FIG.
．． 18 may be formed in advance before joining. Next, it is cut along a plane including the solid line M shown in FIG. Next, the first core 21 is created by mirror-finishing the cut surface on which the regulating groove 20 is provided. In this case, if the bonding surface is in one place, the non-magnetic block 16.18 will crack and the yield of the magnetic gap length will be poor. As shown in FIG. 5, a winding groove 22a is formed on one surface of the back core 22 made of an oxide magnetic material such as Mn-Zn ferrite by machining using a diamond grindstone or the like.
The first core 21 and the back core 22 are joined so that the two metal magnetic films of the first core 21 and the back core 22 are in contact with each other across the winding groove 22a. Next, it is cut along a plane including solid lines Y, Y1 and solid lines X, X1 shown in FIG. 5 to form a magnetic head as shown in FIG.

As described above, according to this embodiment, the gap width can be determined simply by determining the position and width of the regulating groove 20, so that the gap width does not vary. Further, since the thickness of the metal magnetic film does not correspond to the track width and can always be constant, productivity is improved when forming magnetic heads with various track widths.

Effects of the Invention The present invention connects two blocks in which a metal magnetic film is formed on a non-magnetic material through a magnetic gap such that the metal magnetic films face each other, and connects a front core to a back core. By forming it to the joint surface with the back core,
The magnetic circuit formed by the magnetic head can be divided into a part with only a metal magnetic film and a part with an oxide magnetic material, and the magnetic resistance of the back core part where windings are applied can be reduced. It is possible to prevent a decrease in efficiency, and since the magnetic circuit near the medium facing surface is composed only of a metal magnetic film, no pseudo gap is formed. Furthermore, it is not necessary to change the thickness of the metal magnetic film depending on the desired gap (it can be kept constant at all times, which improves productivity).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnetic head according to an embodiment of the present invention, FIGS. 2 to 5 are perspective views showing a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. FIG. 7 is an enlarged plan view showing the magnetic head. 9.10...Nonmagnetic block 9a! 1
0 a... Opposing surfaces 9b, 10b... Slope 11.12... Metal magnetic film 13...
...Magnetic gap 14 ...Adhesive 15 ...Back core 15a ...Winding groove 16 ...Nonmagnetic block 16a ...One side 16b...Groove 17...Metal magnetic film 18...Non-magnetic block 19...Adhesive 20...Regulation groove 21... ...First core 22 ...Back core 22a ... Winding groove Name of agent Patent attorney Toshio Nakao 1 person 9.10-
11 non-E sand block 1511-, line groove Fig. 1/do, l & ---IP=, magnetic flow, 7 g Fig. 2 20-current course Fig. 3 Fig. 4 Fig. 21--1 Houichi core 22- Bag core 22 (1--Ichiyasu arrest lecture Figure 5 21

Claims (2)

[Claims] (1) A front core in which two blocks each having a metal magnetic film formed on a non-magnetic material are joined through a magnetic gap such that the metal magnetic films face each other, and the front core is connected to the front core and is connected to the front core together with the front core. 1. A magnetic head comprising a back core forming a magnetic circuit, and the metal magnetic film is formed up to a joint with the back core. (2) A first step of forming a groove on one surface of a non-magnetic block and forming a metal magnetic film on the one surface, and a step of forming a groove so that the metal magnetic film faces the two blocks formed in the first step. a second step of butt-joining via a non-magnetic film;
A third step of forming a regulating groove for regulating the metal magnetic film to a desired width so as to intersect with the bonding surface formed in the second step, and filling the regulating groove with glass; A fourth step of removing the lower part in the longitudinal direction of the block body formed in the third step, and a fifth step of joining the block removed in the fourth step with the core body formed of a magnetic material. and a sixth step of cutting along the regulating groove.