JPH04221415A - Floating-type magnetic head - Google Patents

Abstract

PURPOSE:To reduce the exposed area of a molded glass layer on the ABS plane of a slider, improve CSS characteristics and, further, facilitate direct observation of a gap depth which has significant influence upon the characteristics of a magnetic head. CONSTITUTION:A glass layer Mb with which one side surface of a head core 1 is bonded to the trench-shaped recess of a slider 2 is provided on an edge trench part 100 formed on the outer side of the ABS plane 4 of the slider 2. The magnetic thin film 14 of the head core 1 is provided near the edge trench part 100 of the slider 2 and on the same plane as the ABS plane 4 of the slider 2.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to technology for floating magnetic heads used in magnetic disk drives.
In particular, the present invention relates to a composite type flying magnetic head using a thin film laminated core as a head core (head chip).

0002

2. Description of the Related Art FIGS. 6 and 7 illustrate a floating magnetic head called a composite type, which is generally used in magnetic disk drives. Such a floating magnetic head includes a slider 2 and a head core (head chip) 1, and is connected to an actuator of the apparatus main body via a leaf spring support mechanism 3. The head core 1 may be a ferrite core chip, or Fe-Si may be formed in the gap of the ferrite.
- The MIG type core chip is formed with a magnetic thin film made of an Al alloy (Sendust) or an amorphous magnetic material, and the air bearing surface of the slider 2 (Air Bearing S
surface, hereinafter simply referred to as "ABS surface". ) It is attached by glass molding (glass welding) in the groove-shaped recess 5 formed in the 4 portion.

Usually, the slider 2 is made of non-magnetic ceramics, and therefore the head core 1 is connected to the slider 2.
The glass molded part, that is, the molded glass M (Fig. 8), is softer than the head core 1 and the slider 2, and is more likely to be dented than other parts in the final finishing of the ABS surface 4. It is known that it is extremely difficult to reduce the thickness to 100 Å or less.

[0004] At such steps, deposits from the disk medium tend to accumulate due to CSS (Contact Start Stop), which increases the frictional force with the disk medium and causes problems in durability. Since the frictional force is proportional to the area, reducing the area of the molded glass M exposed to the ABS surface 4 is an extremely effective means for improving the CSS characteristics.

However, in the case of ferrite and MIG type core chips, since the track width is equal to the width W of the exposed ABS part of the core (FIG. 7), it is necessary to machine only the tip of the head core to 10 μm, for example. On the other hand, the head core thickness T is 10 in terms of handling strength.
Therefore, as shown in FIG. 8, the exposed portion of the mold glass M must be 90 μm or more, which is the difference w between the head core thickness T and the width W of the tip of the head core. There are very serious drawbacks.

Furthermore, in conventional composite flying magnetic heads in which ferrite is used as the entire head core or main part, the entire head core functions as a magnetic core, so in order to support higher frequencies, the total thickness T must be increased. The minimum thickness required for handling strength is 100 μm.
There is no other way than to reduce the inductance per number of turns by making the head core as thin as possible, and there is also the restriction that it is difficult to increase the thickness of the head core to create a structure in which the molded glass is not exposed on the ABS surface.

[0007]

[Problems to be Solved by the Invention] In order to solve the above problems, the present inventors have developed a thin film laminated core, namely Fe, which has been used in VTRs in recent years and is capable of achieving high-density recording and narrowing tracks. - Thin film laminated composite type floating magnetic head using a thin film laminated core made by laminating magnetic thin films made of Si-Al alloy (Sendust), amorphous magnetic material, iron nitride, etc. on a substrate as the head core. noticed. A thin film laminated composite type floating magnetic head is described in Japanese Patent Application No. 2-76365 and Japanese Patent Application No. 2-204202 filed by the present applicant, and is illustrated in FIGS. 9 and 10 attached to this application. like,
For example, the head core 1 is assembled into a predetermined groove-like recess 5 of a ceramic slider 2 formed by cutting and grinding a single piece of ceramic, and the head core 1 is fixed with a glass mold.

Further, according to such a thin film laminated composite type floating magnetic head, as shown in FIG. 9, the track width is defined by the thickness of the magnetic alloy film 14, and the ceramics 11, By reinforcing with 16, the layer thickness of the mold glass Ma, Mb, and Mc when bonding the head core 1 to the slider 2 can be significantly reduced. It can be seen that the exposed area of the mold glass can be greatly reduced, the CSS characteristics can be significantly improved, and an overall reliable composite head can be realized.

However, even in such a thin film laminated composite type floating magnetic head,
Reducing the exposed area of molded glass on the ABS surface, i.e.
Improvement of CSS characteristics is desired.

[0010] Therefore, an object of the present invention is to
By reducing the exposed area of the mold glass on the S plane,
An object of the present invention is to provide a composite type floating magnetic head using a thin film laminated core as a head core, which can improve SS characteristics.

Another object of the present invention is to provide a composite type floating magnetic head using a thin film laminated core as the head core, in which the gap depth, which has an important effect on the characteristics of the magnetic head, can be directly observed. That's true.

Still another object of the present invention is to enable the magnetic thin film to be appropriately positioned in accordance with the track position, and to utilize the outer circumferential side of the disk, which is especially advantageous in terms of recording characteristics, so that the magnetic thin film can be positioned outside the ABS surface. It is an object of the present invention to provide a composite type floating magnetic head using a thin film laminated core as a head core, which can set a track position very close to an edge groove.

[0013]

Means for Solving the Problems The above objects are achieved by a floating magnetic head according to the present invention. In summary, the present invention provides a head core composed of a pair of core half blocks formed by laminating magnetic thin films on a substrate, and inserts the head core into a recess formed on one end face of a slider through a glass layer. In the floating magnetic head configured by integrally bonding the head core to the recess of the slider, the glass layer bonding one side surface of the head core to the recess of the slider is located in an edge groove formed on the outside of the ABS surface of the slider. In the floating magnetic head, the magnetic thin film of the head core is positioned close to the edge groove of the slider and aligned with the ABS surface of the slider.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the floating magnetic head according to the present invention will be explained in more detail with reference to the drawings.

Referring to FIGS. 1 and 2, one embodiment of a composite type flying magnetic head constructed in accordance with the present invention is illustrated. Although FIG. 1 shows a slider 2 and a head core (head chip) 1 integrally joined to the slider 2, the floating magnetic head of this embodiment also has such a structure as in the conventional case. The slider 2 with a head core is connected to an actuator of the main body of the magnetic disk drive via a leaf spring support mechanism.

To explain further, the floating magnetic head has a head core 1 composed of a pair of core half blocks 18 and 19 formed by laminating a magnetic thin film on a non-magnetic substrate, for example, and a head core 1 which is formed by laminating a magnetic thin film on a non-magnetic substrate. Recess 5 formed in one end face
are integrally joined to each other via a glass layer M (Ma, Mb, Mc), and here, one side surface of the head core 1 and the slider 2
The glass layer Mb that joins the recesses of AB of slider 2
Located in an edge groove 100 formed on the outside of the S surface 4,
Further, the magnetic thin film 14 of the head core 1 is configured to be located close to the edge groove 100 of the slider 2 and in alignment with the ABS surface 4 of the slider 2.

Next, with reference to FIG. 5, an embodiment of a method for manufacturing the thin film laminated head core 1, which is used as the head core 1 and is constructed by laminating magnetic thin films on a substrate, will be described. The magnetic thin film 14 is made of Fe-Si-Al alloy magnetic material,
Although amorphous magnetic material, iron nitride, etc. are used, in this embodiment, Fe--Si--Al alloy magnetic material is used.

First, in this embodiment, a non-magnetic substrate 11 such as ceramics is prepared (FIG. 5(A)).
An Fe-Si-Al alloy film 12 is formed thereon by sputtering to a thickness of 1 to 20 μm. Then, the F
A nonmagnetic insulating film 13 is formed on the e-Si-Al alloy film 12 to a thickness of 0.03 to 0.5 μm by sputtering (FIG. 5(B)). The nonmagnetic insulating film 13 is SiO
2, Al2O3, etc. are used.

By repeating the above steps, the Fe-Si-Al alloy film 12 and the non-magnetic insulating film 13 are laminated a necessary number of times, as shown in FIG.
As shown in (C), the alloy magnetic thin film 14 is attached to the substrate 11.
A film is deposited on top.

Next, a laminated glass 15 is formed on the alloy magnetic thin film 14 to a thickness of 0.05 to 1.0 μm by sputtering or the like (FIG. 5(D)).
The other non-magnetic substrate 16 made of the same material as the previous substrate 11 is bonded thereon to produce a magnetic core block 17 (FIG. 5(E)). The laminated glass 15 is SiO
2 -Al2O3 -Na2O glass or Si
O2-B2O3-Na2O glass is suitable.

The magnetic core block 17 thus produced is cut in the direction of the laminated thickness to form a pair of core half blocks 18 and 19, as shown in FIG. 5(F). .

Next, as best illustrated in FIG. 3, after winding grooves 20 are formed in at least one core half block, in this embodiment the core half block 18, according to the conventional method, both core halves are formed. Butt surface 1 of body blocks 18 and 19
8a and 19a, and a non-magnetic gap spacer 21 made of SiO2 or the like and a bonding glass m are formed on the surfaces by means such as sputtering (FIG. 5(F)), and then,
Both core half blocks 18, 19 have the joint surfaces 18a, 1
The parts 9a are bonded with a bonding glass m, and a head core 1 made of a thin film laminated core is obtained. Further, the apex portions of both core half blocks 18 and 19 are filled with apex glass ma for the purpose of preventing chipping during subsequent machining.

On the other hand, the slider 2, which is made of a non-magnetic material such as ceramics and has a generally rectangular cross section, is manufactured by a conventional method such that the edges of both end edges are formed as shown in FIG. The groove portion 100 and the central groove 101 are processed to form the ABS surface 4. Typically, the edge grooves 100 at both end edges have a width of 100 μm, and the ABS surface 4
The depth from the top is 150 μm or more, and the width 4W of the ABS surface 4 is 300 to 700 μm. Further, the front and rear portions of the ABS surface 4 are cut obliquely to form inlet and outlet ends of the inclined surfaces 102 and 103.

According to the present invention, the slider 2 is further formed with a lateral groove 105 passing through it in the lateral direction on the slider end surface on the side to which the head core 1 is joined, and one ABS surface 4
A groove-like recess 5 into which the head core 1 is inserted is formed across the edge groove 100 adjacent to the ABS surface 4. The lateral grooves 105 are for facilitating winding of the head core 1, as will be understood with reference to FIG.

Next, the head core 1 is inserted into the recess 5 of the slider 2 and bonded with molded glass M. Figure 2
2 shows an enlarged view of how the head core 1 and the slider 2 are joined. As illustrated in FIG. 2, according to the present invention, both side surfaces 1a, 1b and rear end surface 1c of the head core 1 are
Fits the wall surface of the groove 5, molded glasses Ma and M, respectively.
It is joined at b and Mc. At this time, the glass layer Mb that joins one side surface 1b of the head core 1 and the recess 5 of the slider 2 is located in the area of the edge groove 100 formed on the outside of the ABS surface 4 of the slider 2, and ,
The magnetic thin film 14 of the head core 1 is configured to be located close to the edge groove 100 of the slider 2 and aligned with the ABS surface 4 of the slider 2. Therefore, the present invention has the advantage that the magnetic thin film 14, that is, the track position, can be set very close to the outer edge groove 100 of the ABS surface 4 so that the outer peripheral side of the disk, which is advantageous in terms of recording characteristics, can be used. There is.

In the floating magnetic head according to the present invention configured as described above, as understood from FIG.
Mold glass layers Ma and Mc exposed on the ABS surface 4
The area of , the layer thickness of glasses Ma and Mc is 10 μm or less,
For example, it can be 1 to 5 μm, so 0.012
It can be less than mm2. This value is the traditional
The minimum area possible with the ferrite type and MIG type composite type floating magnetic head shown in Figure 7 is 0.0.
The area can be reduced to 1/8 or less of 9 mm2, and the minimum area possible with the thin film laminated composite type floating magnetic head shown in FIGS. 9 and 10 is 0.02 mm2.
can be reduced to about 1/2 or less.

[0027] Furthermore, the present invention, as illustrated in FIG.
The apex portion ma' of the apex glass ma can be observed from the end edge groove portion 100 of the slider 2, which also has the advantage of directly observing the gap depth 21a, which is extremely important for the performance of the magnetic head. .

[0028]

As explained above, in the floating magnetic head according to the present invention, a part of the glass layer that joins one side surface of the head core and the recess of the slider is connected to the ABS of the slider.
Since the structure is located in the edge groove formed on the outside of the surface, the exposed area of the mold glass on the ABS surface of the slider can be reduced, improving the CSS characteristics, and improving the characteristics of the magnetic head. It has the advantage that the gap depth, which has an important influence, can be directly observed. Furthermore, the floating magnetic head of the present invention allows the magnetic thin film to be appropriately positioned according to the track position, and in particular, the outer edge of the ABS surface can be used to utilize the outer peripheral side of the disk, which is advantageous in terms of recording characteristics. The track position can be set very close to , which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a composite type floating magnetic head according to the present invention.

FIG. 2 is a perspective view showing a state in which a slider and a head core are joined.

FIG. 3 is an exploded perspective view of a composite type floating magnetic head according to the present invention.

FIG. 4 is a partially enlarged side view of a composite type floating magnetic head according to the present invention.

FIG. 5 is a process diagram showing a method for manufacturing a laminated thin film head core.

FIG. 6 is a perspective view of a conventional ferrite composite type floating magnetic head.

FIG. 7 is an exploded perspective view of a conventional ferrite composite type floating magnetic head.

FIG. 8 is a plan view illustrating the state of a glass mold of a conventional ferrite composite type floating magnetic head.

FIG. 9 is a partially enlarged perspective view of a conventionally proposed thin film laminated composite type flying magnetic head.

FIG. 10 is an exploded perspective view of a conventionally proposed thin film laminated composite type flying magnetic head.

[Explanation of symbols]

1 head core 2
Slider 4 ABS surface 5 Groove-shaped recess 14 Laminated magnetic thin film 18, 19
Core half block 21 Gap 100 Edge groove 105 Horizontal groove

Claims (1)

[Claims] Claim 1: A head core composed of a pair of core half blocks formed by laminating magnetic thin films on a substrate is integrated into a recess formed on one end face of a slider through a glass layer. In a floating magnetic head configured by bonding, a glass layer bonding one side surface of the head core and a recess of the slider is located in an edge groove formed on the outside of the ABS surface of the slider, and A floating magnetic head, wherein the magnetic thin film of the head core is positioned close to an edge groove of the slider and aligned with an ABS surface of the slider.