JPH03273508A - Magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To obtain the magnetic head which is robust and highly reliable with a smaller number of processes without causing the cutting of chips or peeling at the joint surfaces of a gap at the time of polishing of a tape-traveling surface by melting and joining core half bodies by using metallic brazing materials as a gap material. CONSTITUTION:'SENDUST(R)' films 2, 2' are formed on the gap surfaces of a ferrite core material 1 and the films of the metallic brazing materials 4, 4' for the magnetic gap and for joining are formed between the 'SENDUST(R)' films 2 and 2'. Ir films are formed as antireaction films between the ferrite material and the 'SENDUST(R)' films. The joining of the core half bodies is executed by the metallic brazing materials and glass 3. Since the metallic brazing materials are interposed, the secure gap joint is obtd. with the smaller man-hours.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in VTRs, DATs, FDDs, etc., and a method for manufacturing the same.

BACKGROUND OF THE INVENTION In recent years, as magnetic recording technology has been trending toward demands for characteristics in a high frequency range, such as in video, there is a need for magnetic heads and recording media that can adequately handle submicron recording wavelengths. Under these current circumstances, magnetic heads have a holding force H
Recording media with high c (e.g. metal, Ba-Fe tape)
In order to perform sufficient writing, a magnetic alloy film with a higher saturation magnetic flux density Bs (
For example, a magnetic head with a structure in which sendust (an amorphous material) is arranged on the gap surface of ferrite is being developed.

For example, JP-A-60-95704, JP-A-60-3210
A technique disclosed in No. 7, etc. is known.

Problems to be Solved by the Invention However, the gap bonding strength of magnetic heads using a metal magnetic film on the gap surface is weak, and there is a problem that the gap bonding surface may peel off when cutting chips or polishing the tape running surface. .

Means for Solving the Problems The present invention as claimed in claim 1 provides a magnetic head in which a gap surface of a magnetic core mainly made of a ferromagnetic oxide is made of a metal magnetic film, and a metal brazing material is provided on the abutting surfaces of the core halves. This is a magnetic head characterized by the following:

The present invention according to claim 4 provides a method for manufacturing a magnetic head in which the main core is mainly made of ferromagnetic oxide, including the step of processing gear-forming surfaces of core halves that form a pair of magnetic heads into a mirror surface;
A process of forming a reaction prevention film on the L and a metal magnetic film, a process of forming a metal solder (O) on the gap surface as a gap material, and a state in which the gap surfaces of the pair of core halves are butted together. This method of manufacturing a magnetic head is characterized by the step of forming a magnetic gap by heat-treating and bonding in a non-oxidizing atmosphere at a temperature higher than the temperature at which a liquid phase of the metal brazing material appears.

Function: In the present invention, due to the presence of the metal brazing material, a strong gap joint can be made with a manufacturing method that requires fewer man-hours.

Embodiment A magnetic head according to an embodiment of the present invention will be described below with reference to the drawings.

Figure m1 shows an embodiment of the structure of the magnetic head of the present invention, in which a sendust film 2.2' is formed on the gap surface of the ferrite core material l, and a magnetic gap is formed between the sendust films 2 and 2'. A 4.4" metal solder film is formed for bonding, and a 1" film (not shown in the figure) is formed as a reaction prevention film between the ferrite material and the sendust film. This was done using ζJ metal solder and glass 3. The magnetic head chip thus obtained had a strong bonding force.

FIG. 2 shows the configuration of a magnetic head according to another embodiment of the present invention, in which a sendust film 6.6'' is formed on the gap surface of the ferrite core material 5, and between the centerust films 6 and 6'. As a magnetic gap material, SiO2 and a glass film 8 are formed on the abutting surface on the tape running surface side (hereinafter referred to as the front gap), and a metal solder 9 (hereinafter referred to as the hack gap) is formed on the other gap surface. .In addition, an I" film (
(omitted in the figure) is formed. The core halves are joined by a glass film 8, a metal solder 9, and a glass 7 for regulating track width.
The magnetic head chip thus obtained had a strong bonding force.

Next, a method of manufacturing a magnetic head according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a process diagram showing the method for manufacturing the magnetic material of the present invention. FIG. 3(a) shows a core half in which a winding groove 11 is formed in a ferrite core material 10. Figure 3(b)
The reaction prevention 1Ith is applied to the mirror-processed ferrite surface.
(For example, 11.) is formed to about 100 A, and then a sendust film 12 of 3 to 4 μm is formed by sputtering or the like, and a metal solder 13 is further formed as a gap material to form a core half. Incidentally, an Ag-Cu-In alloy was used as the metal solder, and 10 to 60% by weight of CI pipe, 1N:
1 to 40% by weight, preferably Cu: 20 to 45
+ In: The film was formed by sputtering so that the content was in the range of 25 to 35 wt%. FIG. 2(C) shows that after the pair of core halves are butted together and bonded in a non-oxidizing atmosphere at a temperature higher than that at which the liquid phase of the Ag-Cu-In film appears,
A track width regulating groove is machined on the tape running surface, and the glass 14
This is the core 15 which is molded. FIG. 2(d) shows a head chip 16 obtained by cutting the gap-formed core 5 into a predetermined size.

A method of manufacturing a magnetic head according to another embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a process diagram showing the method for manufacturing the magnetic head of the present invention. FIG. 4(a) shows a core half in which a Feray I core material 17 is processed into a mirror surface, a sendust film 18 is formed by sputtering, etc., and a winding groove 19 is formed. A reaction prevention film (for example, Ir) is applied to the mirror-finished ferrite surface.
After forming about 00A, a sendust film of 3 to 4 μm is formed by sputtering or the like. In FIG. 4(b), a track width regulating groove 20 is machined on the gap surface on the tape running surface side, and a SiO2 film and a glass film 21 are used as the gap material on the front gap surface, and a metal solder is used on the pack gap surface. Ag
This is a core half formed by depositing a -Cu-In alloy film 22 by sputtering. FIG. 4(C) shows a pair of core halves butted together in a non-oxidizing atmosphere at a temperature higher than the temperature at which the liquid phase of the Ag-Co-In film appears, and glass 23 is placed in the track width regulating groove 2o. This is the core 24 poured from the winding groove side 19. FIG. 4(d) shows a solid dip 25 obtained by cutting the gap-formed core 24 into a predetermined size. In this way, a magnetic head is manufactured.

Effects of the Invention As described in 1., the present invention uses a brazing metal as the gap material for melting and bonding, thereby achieving a solid and reliable structure that does not peel off at the gap bonding surface during chip cutting or polishing the tape running surface. A high quality magnetic head can be obtained with fewer steps.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of one embodiment of the magnetic head of the present invention, FIG. 2 is a perspective view showing the structure of another embodiment of the magnetic head of the invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a process diagram showing a method of manufacturing a magnetic head according to another embodiment of the present invention. 1, 5, lOl 17... Ferrite material, 2, 6.
12, 18... Sendust film, 3.7, 14.23.
...Glass, 4.9, 13.22...Metal brazing material, 8
．． 21...SiO2 glass film.

Claims (5)

[Claims] (1) A magnetic head in which the gap surface of a magnetic core mainly made of ferromagnetic oxide is made of a metal magnetic film, characterized in that a metal brazing material is formed on the abutting surfaces of the core halves. . (2) In a magnetic head where the gap surface of the magnetic core mainly composed of ferromagnetic oxide is made of a metal magnetic film, a SiO_2 film or an additional glass film is formed on the gap surface on the tape running surface side, and the other gap surface A magnetic head characterized in that a metal brazing material is formed on. (3) An Ag-Cu-In alloy film is used as the metal brazing material, and its composition ratio is Cu: 10 to 60% by weight, In
3. The magnetic head according to claim 1, wherein: 1 to 40% by weight. (4) In a method of manufacturing a magnetic head whose main core is mainly made of ferromagnetic oxide, the step of processing the gap-forming surfaces of the core halves that form a pair of magnetic heads into a mirror surface, and forming a reaction prevention film thereon. a step of forming a metal magnetic film, a step of forming a metal brazing material on the gap surface as a gap material, and a liquid phase of the metal brazing material appearing when the gap surfaces of the pair of core halves are brought into contact with each other. 1. A method of manufacturing a magnetic head, comprising the step of forming a magnetic gap by heat treatment and bonding in a non-oxidizing atmosphere at a temperature higher than . (5) In a method of manufacturing a magnetic head whose main core is mainly made of ferromagnetic oxide, the step of processing the gap-forming surfaces of the core halves that form a pair of magnetic heads into a mirror finish, and forming a reaction prevention film thereon. After that, a step of forming a metal magnetic film, a step of forming a SiO_2 film and a glass film as gap materials on the gap surface on the tape running surface side, and a step of forming a metal brazing material on the other gap surfaces. forming a magnetic gap by heat-treating and bonding the core halves in a non-oxidizing atmosphere at a temperature higher than that at which a liquid phase of the metal brazing material appears with the gap surfaces of the core halves butted against each other. Features: A manufacturing method for magnetic heads.