JPH01102705A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To prevent the jointing part of a ferrite core with a thin film from being peeled by applying following working by jointing the gap butting plane of a first core with that of a second core by a nonmagnetic material. CONSTITUTION:A block can be obtained by forming a glass film 14 so as to cover the entire plane of 'Sendust(R)' sufficiently except for the sliding plane 13 and the side plane of a magnetic recording medium after the thin film 12 of the 'Sendust(R)' is formed on the gap butting plane of a core block 11 made of ferrite by sputtering. Two blocks manufactured in such a way are prepared, and glass films formed on the gap butting planes of those blocks are abutted with each other, and a glass bar 15 is arranged at its apex part, and both blocks are jointed by heating and welding, then, the block can be obtained. In such a way, since the jointing part of the ferrite core with a material with high saturated flux density can be reinforced by the nonmagnetic material sputtered on that part, it is possible to prevent peeling from being generated at a boundary part in the following working.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a magnetic head for recording and reproducing signals on a magnetic recording medium.

Conventional Technology In high-density magnetic recording and reproducing devices, it is generally known that it is advantageous to increase the coercive force He of the magnetic recording medium. In addition, a magnetic field force with a sharp distribution is required, and since ferrite has a low saturation magnetic flux density Bs of 4000 to 5000 Gauss, the pole tip part of the magnetic herad core is saturated with a small magnetomotive force, and the magnetic field distribution becomes wide. This is disadvantageous for density recording.

FIG. 2 shows a magnetic head proposed to eliminate the drawbacks of the first conventional example. In the figure, 1 is a ferrite core, and its gap abutting surface is made of a material with a higher saturation magnetic flux density than ferrite (for example, Fe-Al-
8i alloy (hereinafter referred to as Sendust)) thin film 3
° is formed. Furthermore, a bonding glass 5 is filled between the opposing thin films, that is, the working gap portion 4 . Note that 6 is a pole tip portion, and 7 is a window for coil winding. The present magnetic head is manufactured as follows. That is, two core blocks 8 made of ferrite as shown in FIG. 3(A) with a thin film 9 of sendust or the like formed by sputtering on the gap abutting surfaces are prepared, and the gap abutting surfaces of each block are aligned at a predetermined position. Fix it with a jig etc. with a gap length GL of
A glass rod 10 is placed in the apex part as shown in B), and the block shown in FIG. You get it.

In the obtained magnetic head, due to the action of the thin film 3 with a high saturation magnetic flux density, a steep magnetic field distribution can be obtained without causing magnetic saturation even when the recording current is increased, and it is possible to record even on high coercivity recording media. This makes it possible to obtain a magnetic head that is effective for high-density recording.

Problems to be Solved by the Invention However, during machining such as slicing after forming a thin film made of a material with a high saturation magnetic flux density mainly on the opposing surfaces of the herad core, the joining part 2 of the two types of magnetic materials is Peeling easily occurs (the gap created by this peeling becomes a pseudo-gap, and the magnetic flux leaked or picked up in this pseudo-gap appears as noise, degrading the recording/reproducing characteristics).

Further, the work of fixing the gap abutting surfaces of two blocks with a jig or the like with a predetermined gap length apart is extremely troublesome and has been a factor in reducing productivity.

Means for solving the problem In order to solve the above problem, a non-magnetic material is sputtered in the area including the gap abutment surface and the boundary line between the ferrite core and the thin film on the opposite side of the sliding surface with the magnetic recording medium. A core is prepared, and with the gap abutting surface of this core and the gap abutting surface of the second core in contact with each other, these portions are joined with a nonmagnetic material.

Function: With the above configuration, the joint between the ferrite core and the high saturation magnetic flux density material is reinforced by the non-magnetic material sputtered thereon, so it is possible to suppress peeling at the boundary during subsequent processing. can. Further, by bringing a core in which a nonmagnetic material is sputtered onto a thin film made of a high saturation magnetic flux density material into contact with the gap abutting surface of the second core, the film thickness of the nonmagnetic material becomes the gap length.

EXAMPLE Hereinafter, a first example of the method for manufacturing a magnetic head of the present invention will be described.
This will be explained with reference to the figures.

First, a thin film 12 of sendust is formed by sputtering on the gap abutting surface of a core block 11 made of ferrite as shown in FIG. 1(A). A glass film 14 is similarly formed by sputtering so as to sufficiently cover the entire surface of the sentust thin film, thereby obtaining the block shown in FIG. At this time, the sputtering time is controlled so that the thickness of the glass film is exactly one-half of the desired gap length. The blocks obtained in this way are
As shown in the same figure (C), the glass thin films formed on the gap abutting surfaces of each block are brought into contact with each other, and the glass rod 15 is placed in the apex part,
After that, the two blocks are joined by heating and melting (D
) to obtain the block shown in ). Thereafter, the core chip shown in FIG. 3(E) is obtained through machining such as slicing, and a magnetic head is obtained by winding the core chip.

By the way, since the joint part between the Sendust thin film and the ferrite core block is covered with a glass film except for the part exposed on the sliding surface 13, when performing machining such as slicing as described above, It is possible to prevent peeling from occurring at the bonded portion.

In addition, in order to bring the glass films on the gap abutting surfaces into contact with each other, the gap length is twice the film thickness of the glass film, and as in the past, the gap abutting surfaces of the two cores are held facing each other with a predetermined cap length apart. However, the troublesome work of filling the operating gap with glass can be omitted, and production efficiency can be improved.

In this example, in order to obtain a magnetic head in which the sendust thin film is formed on both sides of the core facing the gap, the first
Although the two blocks shown in Figure (B) were prepared, it goes without saying that the second core block to be joined to the block shown in this figure may not have the sendust thin film formed thereon. However, in that case, the film thickness is determined taking into account that the glass film thickness becomes the gap length.

Effects of the Invention As explained above, according to the present invention, a core in which a non-magnetic material is sputtered in a region including the gap abutting surface and the boundary line between the ferrite core and the thin film on the side opposite to the sliding surface with the magnetic recording medium. By preparing a gap abutting surface of this core and a gap abutting surface of a second core and joining the outside of this part with a non-magnetic material,
The joint between the ferrite core and the thin film will not peel off during subsequent processing, resulting in good recording and recording.
A magnetic head that exhibits good reproduction characteristics can be provided. In addition, since the gap length can be controlled by controlling the thickness of the non-magnetic material formed by sputtering, it is possible to join the two cores with the abutting surfaces of the caps of the two cores in contact with each other. Workability is improved and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head in the middle of processing according to a method of manufacturing a magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view of a conventional magnetic head, and FIG. 3 is a perspective view of a magnetic head according to a conventional method of manufacturing a magnetic head. FIG. 3 is a perspective view of the magnetic head during processing. 1... Ferrite core, 2... Joint part, 3... Thin film, 4...
...Operating gap portion, 5...Glass for bonding, 6...
Pole chip part, 7... Zlll for coil winding... core flock, 12... sendust thin film, 13... connection with magnetic recording medium. Sliding surface, 14...
...Glass membrane, 15...Glass rod Name of agent Patent attorney Toshio Nakao and one other person Figure 1 Ward c111c' + Ko Ha faction
litigation

Claims (3)

[Claims] (1) A thin film made of a high saturation magnetic flux density material is formed by sputtering on the gap abutting surface of the ferrite core, and the ferrite core and the thin film are formed on the side opposite to the gap abutting surface and the sliding surface with the magnetic recording medium. A first core in which a non-magnetic material is sputtered in a region including the boundary line is prepared, and a gap abutting surface of this first core and a second core are prepared.
1. A method of manufacturing a magnetic head, which comprises joining the core with a gap abutting surface in contact with the core. (2) The gap abutting surface of the second core is also formed by sputtering a thin film made of a high saturation magnetic flux density material and a non-magnetic material, similarly to the first core. A method for manufacturing a magnetic head according to item 1. (3) The method for manufacturing a magnetic head according to claim 1, wherein the high saturation magnetic flux density material is a Fe-Al-Si alloy.