JPS6286529A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To improve the electromagnetic transducing characteristic by forming a metallic magnetic body thin film having saturated magnetic flux density larger than a magnetic body core at a gap facing surface. CONSTITUTION:At least on the edge part of one side sliding rail 1b out of sliding rails 1b and 1b provided at both sides, at the interval of a track width Tw, the metallic magnetic body thin film (not shown in the figure) having the saturated magnetic flux density larger than magnetic body cores 1 and 2 is formed at gap facing surfaces 1a and 2a of one side magnetic body core 1 where grooves 3 and 3 are provided, and other magnetic body core 2 where the same grooves 4 and 4 are provided at the position opposite to the grooves 3 and 3. Thereafter, a non-magnetic film is formed to regulate the gap length, the side of gap facing surfaces 1a and 2a is made close, a glass 5 is filled be tween gap facing surfaces 1a and 2a in facing grooves 3 and 4, respectively, and both magnetic body cores 1 and 2 are junctioned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating magnetic helad used in magnetic disk drives and the like.

[Conventional technology]

Conventionally, floating magnetic heads used for magnetic disk Vt placement, etc. include Winchester type heads (Figure 2), thin film spatula l/ (Figure 3), and component heads (Figure 4).
etc. are used.

These magnetic recording devices are often used in large-capacity recording systems and data files, and are required to have improved magnetic performance.

In recent years, with the increase in the density of magnetic recording, efforts have been made to increase the saturation magnetic flux density and coercive force of media.

In line with this trend, a composite magnetic head combining a metal magnetic film and ferrite has been devised and is being studied as a head for 8m5 VTRs and the like. This is no exception for magnetic disk drives.

C8S resistance is one evaluation method for indicating the MM properties of these floating magnetic heads.

In other words, when the magnetic disk starts or stops propagating, the magnetic head repeatedly floats and contacts the magnetic disk surface, but as the number of repetitions increases,
A phenomenon occurs in which the magnetic head scratches or gets caught on the magnetic disk surface, causing damage to the magnetic disk surface or the magnetic head. There is an evaluation method called "IT CSS" which indicates the frequency with which this phenomenon occurs.

However, in order to solve the above problems, it is necessary to
It is necessary to improve the S properties.

Furthermore, as magnetic disk drives are widely used, there is also a demand for lower prices for magnetic heads, and consideration must be given to simplifying the process involved in manufacturing magnetic heads.

[Problem that the invention seeks to solve]

When considering the need to cope with higher density, conventional 7-elite heads have low saturation magnetic flux density, resulting in insufficient writing to the medium. Therefore, there is nothing other than thin-film heads that have sufficient electromagnetic conversion characteristics for high-He media for high-density recording.

Further, as for the Winchester type head and the composite type head, a composite head of a metal magnetic film and ferrite as described above is being considered, but this has the disadvantage that the number of manufacturing steps is increased due to the hη structure.

Furthermore, from the point of view of reliability, among conventional magnetic heads, the Winchester type head has a magnetic field at the end of the slide rail 1c provided between the slide rails 1b and lb on both sides, as shown in figure f52. Since the rad 2c is protruding and the thin film head is made up of multiple WI films laminated as shown in Figure 3, it is fundamentally difficult to improve the 1tcss property due to its structure. It is.

Furthermore, although the combo knot head has the advantage of improving C8S resistance, it has a structure in which the magnetic head chip 2C is embedded in the slider 1b, so it has the disadvantage of requiring more manufacturing steps.

An object of the present invention is to provide a floating magnetic head that has improved electromagnetic conversion characteristics and C8S resistance, is easy to manufacture, and has excellent mass productivity.

[Means for solving problems]

As shown in one embodiment of the floating magnetic head of the present invention in FIG. Gap facing surface between one magnetic core 1 provided with grooves 3.3 at intervals of , and the other magnetic core 2 provided with similar grooves 4.4 at positions facing the grooves 3.3 1a and 2a, a metal magnetic thin film (not shown) having a higher saturation magnetic flux density than the magnetic core 1.2.
After that, a non-magnetic film is formed for regulating the gear lubricant, and the gap facing surfaces in and 2a are brought close to each other, and the gap between the gear and lubricant facing surfaces 1a and 2a and the opposing groove 3 are brought close to each other.
．． 4 is filled with a positive electrode 5a, respectively, and both magnetic cores 1.2 are joined.

[For production]

A metal magnetic thin film with a saturation magnetic flux density higher than that of the magnetic core is formed on the gap-opposing surface, and glass bonding is applied, making it possible to sufficiently record even high Hct and objects, improving electromagnetic conversion characteristics. It is something that can be done.

Furthermore, since the gap part is embedded within the slide rail, IT CSS properties are significantly improved, and both magnetic cores, whose track widths have been predetermined by cutting grooves, can be filled with positive filling. Since the bonding process is simply made by joining, the number of steps is small and manufacturing is extremely easy.

〔Example〕

Hereinafter, an example of the manufacturing process of the floating magnetic head of the present invention will be explained with reference to FIGS. 5(a) to 5(C).

(Example 1) First, magnetic core carriers IA and 2A of a predetermined shape (in this example, one is ■-shaped and the other is C-shaped with longitudinal [2b]) with mirror-finished gap facing surfaces 1a and 2a are manufactured. (
PtS5 diagram (a)).

Next, grooves 3.3 and 4, 4 for determining the track width Tw are formed in the upper corners of the gap facing surfaces in, 2a of the magnetic core carriers IA, 2A.
(in this example, the grooves are formed diagonally), and a non-metallic magnetic thin film having a saturation magnetic flux density Bs larger than that of the magnetic core carriers IA and 2A is provided on the gap-opposing surface 1a12a. A crystalline Co-based alloy film (not shown) is formed (PIS 5 (b)).

Furthermore, a non-magnetic material for gap regulation is formed on this, and the gap-opposing surfaces 1a and 2a of each magnetic core carrier IA and 2A are brought close together (fJSS diagram (e)), and the softening temperature is set in the longitudinal groove 2b. 350℃, thermal expansion coefficient 115X
A lead-silicate glass rod 5 of 10-'deg-' is inserted (Fig. 55 (d)), and heat treatment is performed to hold it at 460° C. for 30 minutes to melt the glass rod 5, and the glass rod 5 is melted between the grooves 3 and 4. The melted glass 5a is flowed in and filled, and the longitudinal grooves 2b are also reinforced with glass 5a, and the magnetic core carriers IA and 2A are joined to form a block (FIG. 5(e)). .

After that, by cutting the blocks joined in this way and machining them into a predetermined shape, multiple floating magnetic heads (three in this example) as shown in the Pt51 diagram can be made from one block. It is manufactured.

(Example 2) Furthermore, in the same manufacturing process, a metal magnetic thin film was
e - When using Al-8a alloy, the softening temperature of the steel rod is 450' C1 thermal expansion coefficient 125 x 10-'
A similar bonded block of a magnetic head can be formed by using lead-silicate glass of deg-' and performing a heat treatment at 600° C. for 30 minutes to perform bonding.

〔Effect of the invention〕

As described above, according to the present invention, the metal magnetic material *g having a larger saturation magnetic flux density than the magnetic core is provided on the gap facing surface.
, the electromagnetic conversion characteristics are improved, and since the gap part is built into the slide rail, 1c
SS properties have been improved, and one or more heads can be connected in one bonding process. Since it can be removed by manufacturing, the manufacturing process is simplified and production can be performed with high efficiency.

In addition, by forming gap parts on both slide rails with the same Tu+ processing as described above, it becomes possible to use magnetic heads of the same shape on both the upper and lower sides, allowing both the upper and lower sides of the disk to be used. Seed cores can be made with one core.

Furthermore, by switching between the gaps on both sides and operating the disc, the usage efficiency of the disc can be improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2.3.4
The figure is a perspective view of a conventional floating magnetic head.
, (b), (e), (d), and (fl) are perspective views showing an example of the manufacturing process of the floating magnetic head of the present invention. 1.2: Magnetic core, in, 2a: Gap opposing surface,
2b: Longitudinal groove, 3.4: Groove, 5: Glass rod, 5
a: Glass agent Patent attorney Takashi Honma 5th (a) (C) (d),? (e)

Claims (1)

[Claims] One of the magnetic cores is provided with a groove at an interval of the track width at the end of at least one of the slide rails provided on both sides, and a similar groove is provided at a position opposite to the groove. A metal magnetic thin film having a saturation magnetic flux density larger than that of the magnetic core is formed on each of the surfaces facing the gap with the other magnetic core provided, and the gap facing surfaces are brought close to each other to form a gap between the gap facing surfaces. A floating magnetic head characterized in that the opposing grooves are filled with glass and both of the magnetic cores are bonded to each other.