JPH0386907A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To obtain the floating type magnetic head having excellent mechanical strength by providing the parts where a ferromagnetic oxide material is exposed on a back gap side of the surfaces facing the gap to a 2nd core half body and packing glass for joining and fixing the 1st and 2nd core half bodies in these parts. CONSTITUTION:A front gap forming surface 21 and a back gap forming surface 22 are formed on the 1st core half body 1a. An underlying layer 4, a ferromagnetic metallic thin film 5 and a gap spacer 6 are formed on the 2nd core half body 1b. The glass 7 is packed into the grooves on the 1st core half body 1a. The 1st and 2nd core half bodies 1a, 2b are then butted against each other and the glass 7 is packed into the parts 101 to 103 and is solidified to form the core block. The core half bodies 10a, 10b are securely joined to each other in this way and the floating type magnetic head having the excellent mechanical strength is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a floating magnetic head used for a hard disk type recording medium. The present invention relates to a so-called MIG (metal-in-gap) type floating magnetic head.

(B) Prior Art In recent years, there has been a significant demand for miniaturization of hard disk drive devices, and high-density recording on recording media has become an important issue. For this reason, metal thin film magnetic disks with high coercive force (Hc) have been developed as recording media in place of conventional oxide coated magnetic disks. As a magnetic head compatible with such a metal thin film type magnetic disk, for example, Japanese Patent Laid-Open No. 62-295207 (GllB
5/23), a film of high saturation magnetic flux density material such as sendust or amorphous magnetic alloy is deposited by sputtering on the gap abutting surfaces of conventional monolithic or composite type immobile magnetic heads.
An IG type (metal-in-gap type) floating magnetic head has been proposed.

FIG. 11 is a diagram showing the vicinity of the gap on the medium facing surface of the MIG type floating magnetic head. In the figure, (lla) (l
lb) is a core half made of Mn-Zn ferrite, (12) is a ferromagnetic metal thin film such as Sendust, (13>
is a gap spacer such as SiO*, and a core chip (dan) is formed by the core halves (lla) (llb), the ferromagnetic metal thin film (12), and the gap spacer (13). The core chip (14) has a slider (
(not shown) by bonding glasses (15) (15).

Next, a method of manufacturing the MIG type floating magnetic head will be described.

First, the first and second layers are made of Mn-Zn ferrite.
Prepare substrates (16a) and (16b), and
) (16b) After mirror-polishing the upper and lower surfaces of the substrate (16b), as shown in FIG. A gap spacer (13) having a film thickness of about 100 nm is deposited by sputtering. In addition, as shown in FIG. 13, the upper surface (gear forming layer) of the second substrate < 16b has pre-processed grooves at a constant pitch P so as to obtain a pre-track width t1 that is slightly wider than the desired track width. (17) is formed.

Next, the winding groove (18) is formed on the upper surface of the second substrate (16b).
), as shown in FIG.
6a) After abutting the top surfaces of (16b), the 15th
A glass rod (19) is inserted into the winding groove (18) as shown in the figure.
By inserting the glass rod (19) and melting and solidifying it, a first groove is formed in the pre-processed groove (17) as shown in FIG.
The pair of substrates (16a) are filled with glass (110) of
(16b) is glass bonded to form a block (±).

Next, the block (111) is cut along the broken line AA' to form a core block (month 1), and desired tracks are formed on the medium facing surface of the core block (114) as shown in FIG. Track radius regulating grooves (112) are machined at a pitch P so as to obtain a width t2, and a medium facing protrusion (113) is formed.
form.

Next, by slicing the core block (river), core halves (lla) (llb) are obtained as shown in FIG.
, ferromagnetic metal thin film (12) and cap spacer (13)
) to form a core chip (14).

Next, as shown in FIG. 19, a slider (116) made of non-magnetic ceramic such as calcium titanate is prepared, in which a slit (115) for attaching the core chip is formed.
The 20th slit (115) of the slider (116)
As shown in the figure, a core chip (14) is inserted, and a glass substrate (117) made of a second glass having a lower softening point than the first glass is placed thereon.

Next, as shown in FIG. 21, by melting and solidifying the glass substrate (117), both sides of the medium facing protrusion (113) and the slit (115) of the slider (116) are formed.
A second glass (15
) to fix the core chip (14) to the slider (116), and then fill the slider (116) with
) is provided with an external mold such as a chamfer portion (118), thereby completing a floating magnetic head.

However, in the above conventional floating magnetic head, the 18th
One core half (lla) of the core chip (14) shown in the figure
) has a ferromagnetic metal thin film (12) and a gap spacer (13) formed over the entire joint surface with the other core half (llb), so the core half t*(lla)(llb)
The glass (110) that joins the core half (l
There is a problem that the bonding strength between la) (llb) is weak.

(C) Problems to be Solved by the Invention The present invention has been made in view of the drawbacks of the above-mentioned conventional examples.
The object of the present invention is to provide a floating magnetic head having a core chip having excellent mechanical strength by firmly joining a pair of core halves to each other.

(d) Means for Solving the Problems The present invention has a first method made of a ferromagnetic oxide material. a second core half, the second core half has a ferromagnetic metal thin film on a surface facing the gap, and the ferromagnetic metal thin film is joined to the first core half through a gap spacer serving as a magnetic gap; In a floating magnetic head, the core chip is fixed to a slider made of a non-magnetic material,
The second core half has a portion on the backgap side of the gap-opposing surface where the ferromagnetic metal thin film is not present and a ferromagnetic oxide material is exposed, and the first and second cores are attached to this portion. It is characterized by being filled with glass that joins and fixes the halves.

Further, the present invention provides a floating magnetic head having the above configuration,
The ferromagnetic metal thin film is exposed from the side surface of the core chip on the back gap side.

(E) Effect According to the above configuration, the glass that joins and fixes the first and second core halves is a ferromagnetic oxide that forms the first and second core halves, which is compatible with the glass on the back gap side. Since the first and second core halves are in direct contact with each other, the first and second core halves are firmly joined and fixed.

(F) Example A first example of the present invention will be described below. first,
As shown in Figure 3 (a) and (b), 2
Of the two first and second core block halves (1a) and (lb), a depth regulating groove (2) and glass filling grooves (3a) and (3b) are formed on the first core block half (1a) using a diamond grinding wheel. The front gap forming surface (2
1) and a back gap forming surface (22) are formed. Further, on the second core block half (1b), there is a base layer (4) such as 5ift or permalloy for preventing pseudo gaps, a ferromagnetic metal thin film (5) such as Sendust, and a gap spacer (6) such as SiO. ) is formed by a method such as sputtering.

Next, as shown in FIG. 4(a), the first core block half (1
a) After filling the upper groove with glass (7), insert the winding window (8)
). Furthermore, among the underlayer (4), ferromagnetic metal thin film (5), and gap spacer (6) on the second core block half (1b), as shown in FIG. the first portion (101) facing the winding window (8) of the body (1a) and the first portion on the front gap side (above the first portion (101'));
The second portion (102) facing the glass-filled groove (3a) of the core block half (1a) and the first portion on the back gap side (lower than the first portion (101))
The third portion (103), which is slightly wider than the portion facing the glass-filled groove (3a) of the core block half (la), is removed by a method such as ion etching to form the first and second core block halves (1). 1a) Expose the ferromagnetic oxide that constitutes (1b) itself.

Next, as shown in Fig. 5, the first and second core block halves (l
a) Attach the (lb) gap spacer (6) to the front gap forming surface (21) and back gap forming surface (22>)
A core block (1) is formed by filling and solidifying glass (7) into the first, second, and third portions (101, 102, and 103) so that they face each other.

Thereafter, as shown in FIG. 6, the outer shape is processed to a predetermined size by a method such as grinding, and the first and second core halves (10a
) (10b) is formed.

Thereafter, as shown in FIG. 1, a groove (23) is formed on the upper surface of the core chip (10) to form a medium facing protrusion (24) having a track width Tw.

Incidentally, FIG. 2 is a bottom view of the core chip (10).

Thereafter, as is well known, the core chip (10) is mounted in the slit of the slider to complete the floating magnetic head of this embodiment.

In the core chip (10) of the floating magnetic head of the first embodiment as described above, the first and second core halves (10a) (10
ferromagnetic oxidation of the first and second core halves (10a) and (10b) that have good compatibility (wettability) with the glass in the third part (103) on the back gap side where the glass (7) to bond and fix b) Since the core halves (10'a) and (10b) are in direct contact with objects, the first and second core halves (10'a) and (10b) are firmly joined and fixed.

In the above manufacturing method, after slicing the core block (1) in the steps shown in FIGS. 6 and 7, the core chip (
10〉 has been processed with a groove (23), but the conventional Fig. 17~
The same effect as described above can be obtained by slicing the core block to form a core chip in which the medium facing protrusion is located in the center after grooving the core block as shown in FIG.

Next, regarding the second embodiment of the present invention, FIGS.
This will be explained with reference to the figures. The features of this embodiment are as shown in FIG. Underlayer (4) on the second core block half (1b) from the state of the second core block half (la) (lb)
In the step of removing the ferromagnetic metal thin film (5) and the gap spacer (6), the back gap side is left in the length direction of the block as shown in FIG. 9, making it, for example, T-shaped. The following steps are similar to those described above, such as glass welding, slicing, and polishing to obtain the core chip shown in FIG. Therefore, by using an etching pattern as shown in FIG.
), the ferromagnetic metal thin film (5), and the gap spacer (6) are exposed on the side surface of the core, and peeling of the ferromagnetic metal thin film (5) can be easily inspected by simply observing the side surface.

In addition, FIG. 10(a) is a dashed-dotted line B-B in FIG.
Figure 1O shows a perspective view of the first core block half (1a) divided at
indicates the case with other etching patterns,
Even if etched in this way, the base layer on the back gap side (
4), ferromagnetic metal thin film (5), gap spacer (6)
is left in the longitudinal direction of the block, so that the underlayer (4), ferromagnetic metal thin film (5), and gap spacer (6) on the back gap side are exposed on the side surface of the core, which is preferable.

Note that the underlayer (4) formed to prevent pseudo-gaps may be omitted if the pseudo-gap output can be suppressed to a level that does not pose a practical problem by improving the welding conditions, etc., but in this case, ferromagnetic metal The bonding strength between the thin film (5) and the second core block half (1b) can be improved.

(G) Effects of the Invention According to the present invention, the first and second core halves forming the groove bottom of the core chip can be firmly joined to each other, and a floating magnetic head with excellent mechanical strength can be provided. .

Furthermore, according to the present invention, peeling of a ferromagnetic metal thin film can be easily inspected, the number of work steps can be reduced, and a highly reliable floating magnetic head can be provided.

[Brief explanation of drawings]

1 to 7 relate to the first embodiment of the present invention, in which FIG. 1 is a perspective view showing the appearance of the core chip, FIG. 2 is a view of the core chip viewed from the bottom side, and FIGS. 3 and 4. , FIG. 5, FIG. 6, and FIG. 7 are perspective views showing the manufacturing method, respectively. 8 to 10 relate to a second embodiment of the present invention, in which FIG. 8 is a perspective view showing the appearance of the core chip, FIG. 9 is a perspective view showing a half core block, and FIG. 10 is a sectioned core chip. It is a diagram. 11 to 21 relate to the conventional example, and FIG. 11 is a diagram showing the vicinity of the gap of the core chip, FIG. 12, and FIG.
Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18
19 and 20 are views showing the manufacturing method, respectively, and FIG. 21 is a perspective view showing the external appearance of the floating magnetic head. <5)...Ferromagnetic metal thin film, (6)...Gap spacer, (7)...Glass, (10)...Core chip, (10a) (10b)...-first, second core half,
(22)--Back gap forming surface, (103)...Third portion.

Claims (2)

[Claims] (1) First and second core halves made of a ferromagnetic oxide material, the second core half having a ferromagnetic metal thin film on a surface facing the gap, and the ferromagnetic metal thin film serving as a magnetic gap. In the floating magnetic head, the second core half is connected to the first core half through a gap spacer to form a core chip, and the core chip is fixed to a slider made of a non-magnetic material. It has a part on the backgap side of the surface where the ferromagnetic oxide material is exposed without the ferromagnetic metal thin film, and this part is filled with glass for bonding and fixing the first and second core halves. A floating magnetic head characterized by: (2) The floating magnetic head according to claim (1), wherein the ferromagnetic metal thin film is exposed from a side surface on the back gap side of the core chip.