JPH0345442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head and a method of manufacturing the same.

High-density recording technology has improved significantly in recent years, and improvements in magnetic tapes have been cited as one of the reasons for this, and improvements in their coercive force are prompting a change in magnetic head materials. In other words, if we look at video heads, which are representative of the current magnetic heads for short wavelength recording, ferrite heads with a glass mold are currently mainstream due to their wear resistance and reliability of the magnetic gap. . However, the maximum magnetic flux density Bm of ferrite is at most 5000 Gauss, and for magnetic tapes with a coercive force exceeding 1000 Oersteds, the magnetic saturation of the core causes a decrease in recording efficiency. What is proposed here is a metallic magnetic material with a higher maximum magnetic flux density Bm than ferrite. Sendust and Alperm are being considered as candidates, but both have the fatal flaw of low wear resistance.

Therefore, amorphous magnetic materials with various compositions that can be selected arbitrarily are being considered, and materials that have wear resistance similar to that of ferrite are emerging. However, amorphous magnetic materials
Due to the manufacturing process, it is not possible to obtain it as a bulk material, but only in the form of a ribbon or a thin film, so it has been extremely difficult to manufacture it into a magnetic head.

The present invention has been made in view of the above-mentioned conventional problems, and provides a method for manufacturing a magnetic head using a soft magnetic film, particularly an amorphous thin film, and a magnetic head constructed from the amorphous thin film.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, as shown in Fig. 1, a Mn-Zn polycrystalline ferrite core 1 is made into a tanzak shape, a groove is cut into the core 1 so that it becomes U-shaped, and the opening of the groove is filled with glass 2. do.

At that time, the winding window 3 used in the subsequent process is not filled with glass. The opening surface 4 of the core is
Polish thoroughly and evenly.

Next, as shown in Fig. 2, Co
- An amorphous film 5 containing Nb as a main component is formed by high frequency sputtering to a thickness of, for example, about 30 μm.

Next, as shown in FIG.
First, create a track format mask and use dry etching to create the desired track shape. That is, in FIG. 3, 6 indicates a hole removed by etching, and this hole 6
penetrates to the glass 2 part.

Next, as shown in FIG. 4, in order to fill the hole 6, a low melting point glass 7 is filled at a temperature lower than the crystallization temperature of the amorphous film 5, and the upper surface of the amorphous film 5 is covered (overcoated). do.

Next, as shown in FIG. 5, the core block 1 with the low melting point glass 7 formed thereon is cut along the center line, the cut surface 8 is polished sufficiently flat, and the polished surface is coated with a non-containing material such as SiO ₂ . A magnetic material layer is formed as a gear spacer 9 by sputtering, the separated left and right cores are butted together again, and the low melting point glass 7 is remelted to bond the left and right cores together. At this time, the low melting point glass 7 diffuses not only into the low melting point glass but also into the initially molded glass 2 through the etching holes 6, and the left and right sides of the glass 2 are remelted.
Bond strength increases.

The subsequent process is similar to the processing method for normal ferrite video heads, in which each chip is individually cut and the front surface of the head is polished until it reaches a predetermined gear depth (in this case, the gear depth corresponds to the amorphous film thickness). ) the magnetic head 6th
Complete as shown.

In the magnetic head shown in FIG. 6, a window 3 is formed by joining the cutout end surfaces of a pair of cores 1 and 1', and a glass layer 2 is filled on the opening side of the window 3. A soft magnetic amorphous film 5 having a spacer 9 for a magnetic gap on the upper surface of the glass layer 2
was formed.

Further, as is clear from FIG. 6, the tape sliding surface is formed of an amorphous film 5 and an etched hole 6 filled with low melting point glass 7, and the low melting point glass portion in the etching hole 6 is formed on the tape sliding surface. Since the upper surface of the amorphous film 5 becomes a convex portion and the upper surface of the amorphous film 5 becomes a convex portion, no problem occurs. In addition, since the etching pattern was formed on the glass 2 that was initially formed at the opening of the groove of the core 1, the mold glass 2 was remelted by the diffusion of the low melting point glass, allowing for strong adhesion, even when the tape was running. A highly reliable gap without gap collapse can be formed. Further, the winding window 3 is not filled with glass, and winding can be easily performed.

These advantages are achieved by manufacturing the magnetic head of the present invention in which the opening of the groove of the U-shaped core is filled with glass, the opening is made of an amorphous film to form a closed magnetic path, and a track pattern is formed on the glass. By adopting this method, there will be no problem during gap formation due to subsequent splitting and remelting. Furthermore, the magnetic head of the present invention obtained by the same method has a homogeneous material made of a soft magnetic film formed on the tape sliding surface, and has a magnetic gap with excellent durability and strength. be.

[Brief explanation of drawings]

1, 2, 3, 4, and 5 are perspective views for explaining a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. 6 is an embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... U-shaped ferrite core, 2... Filled glass, 3... Winding window, 4... Amorphous amorphous sputtered surface, 5... Amorphous amorphous film, 6... Etched hole, 7... Low melting point glass, 8... Gap surface, 9
...Gear spacer.

Claims (1)

[Claims] 1. The end surfaces of a pair of cores each having a notch portion are
A magnetic head in which a window is formed by bonding, a glass layer is filled on the opening side of the window, and a soft magnetic film having a magnetic gap is formed on the upper surface of the glass layer. 2. The magnetic head according to claim 1, wherein the soft magnetic film is made of soft magnetic amorphous. 3. A step of providing a soft magnetic film so that the opening of the groove forms a closed magnetic path in a U-shaped core filled with glass, a step of providing a hole for forming a head track width in the soft magnetic film, and a step of providing at least the soft magnetic film with a hole for forming a head track width. a step of filling a hole provided in the magnetic film with low melting point glass, a step of cutting and dividing the U-shaped core from a position passing through the hole for forming the head track width to create a pair of cores, and a step of creating a pair of cores. The divided surface was finished to be flat and mirror-finished to serve as a magnetic gap forming surface, and a layer of non-magnetic material such as glass was provided depending on the thickness of the required magnetic gap width, and then the magnetic gap forming surfaces were overlapped. After that, after the step of rebonding them together with the glass, the magnetic film is polished to have a tape sliding surface with a head track pattern exposed. 4. The method of manufacturing a magnetic head according to claim 3, wherein the soft magnetic film is formed by sputtering soft magnetic amorphous amorphous.