JPH03224111A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To obtain a core chip which prevents the peeling of ferromagnetic metallic thin films and the failure of magnetic core half bodies and has the secure joining strength of the magnetic core half bodies to each other by parting the core chip to the 1st ferromagnetic metallic thin film positioned on the surface side for sliding contact with a medium and the 2nd ferromagnetic metallic thin film positioned on the side opposite from the surface for sliding contact with the medium. CONSTITUTION:The 1st ferromagnetic metallic thin film 241 exists in the upper part nearer the surface side for sliding contact with the medium with a winding window 23 and the lower end part 241a is positioned within high melting glass 22. The high melting core 22 is, therefore, in direct contact with the 2nd core half body 19b. The 2nd ferromagnetic metallic thin film 242 exists lower than a winding grove 20 and a gap spacer 252 formed thereon constitutes a back gap part. The floating type magnetic head having the core chip which suppresses the peeling of the ferromagnetic metallic thin films and the failure of the mag netic core half bodies and has the excellent mechanical strength is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a floating magnetic head used for a hard disk type recording medium.

(B) Prior Art In recent years, there has been a strong demand for miniaturization in 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 (GIIB5
23), MI in which a high saturation magnetic flux density material such as sendust or an amorphous magnetic alloy is deposited by sputtering on the gap abutting surfaces of conventional monolithic or composite floating magnetic heads. A G-type (metal-in-gap type) floating magnetic head has been proposed. .

FIG. 5 is a perspective view showing the appearance of a MIG type floating magnetic head.

In the figure, (1) is a slider made of non-magnetic material,
A core chip (3) having a magnetic gap (31) is bonded and fixed in the core storage recess (2) of the slider <1) with a low melting point glass (4).

Next, a method of manufacturing the above-mentioned floating magnetic head will be explained.

First, as shown in FIGS. 6(a) and (b), M n −Z
Among the first and second substrates (5a) and (5b) made of a ferromagnetic oxide material such as r+ ferrite, one of the first substrates (5a
) A winding groove (6), a glass rod insertion groove (7), and a glass filling groove (8) are formed on the gap forming surface of the groove. Further, on the gap forming surface of the other second substrate (5b), a strip-shaped ferromagnetic metal thin film (9) made of sendust or the like is deposited by sputtering or the like, and S
Gap spacers (
10) is deposited and formed.

Next, as shown in FIG. 7, the gap forming surfaces of the pair of first and second substrates (5a) and (5b) are pushed together through the ferromagnetic metal thin film (9) and the gap spacer (10). Insert the glass rod (11) into the glass rod insertion groove (7).
), then insert the pair of first and second substrates (5a) (
5b) by pressurizing and heating the glass rod (11
) is melted to fill the glass filling groove (8) with high melting point glass (
12) and the first and second substrates (5a) (5b)
Join and fix.

Next, the core block (1
4) Form.

Next, as shown in FIG. 9, a track width regulating groove (15) is formed on the end surface (14a) of the core block (U) on the side in which the medium slides, so that the width t is equal to the track width of the magnetic gap (31). A medium facing protrusion (16) is formed.

Next, the core block plate is cut along the broken line B-B'' to complete the core chip C'' shown in FIG. 1O.

Finally, the core chip Ω is fitted into the storage recess (2) of the slider (1) and the track width regulating groove (1
6) By filling and solidifying the low melting point glass (4), the core chip assembly is fixed in the housing recess (2), thereby completing the floating magnetic head shown in FIG.

However, in the above-described floating magnetic head, distortion occurs between the ferromagnetic metal thin film (9) and the ferromagnetic oxide material constituting the second substrate (5b) due to the difference in thermal expansion coefficient between them. 1st
As shown in FIG. 1, there is a risk that the ferromagnetic metal thin film (9) may peel off from the second substrate (5b) constituting the magnetic core half.

A method to solve the above problem is to use a ferromagnetic metal thin film (
There is a method of dividing the ferromagnetic metal thin film (9) into a front gap side and a back gap side to reduce the above-mentioned strain and prevent peeling of the ferromagnetic metal thin film (9).

However, even in this method, since strain is concentrated at the end (9a) of the ferromagnetic metal thin film (9), as shown in FIG. ) is within the track width regulating groove (16), the processing of the trunk width regulating groove (16) will cause cracks (17) or Chip (1
8) occurs, and as shown in FIG. 14, the magnetic core half (5) is
b) A ferromagnetic metal thin film (9) exists throughout the thickness direction,
The end (9a) of the high melting point glass (1) is inside the winding groove (6).
2), between the magnetic core half and the ferromagnetic metal thin film (9), and between the ferromagnetic metal thin film (9) and the high melting point glass (
12) Peeling of the ferromagnetic metal thin film (9) occurs between
Cracks and cracks occur in the magnetic core half. Moreover, in the latter case, the high melting point glass (12) has poor wettability with respect to the ferromagnetic metal thin film (9), so that the problem arises that the bonding strength between the magnetic core halves is weak. The thermal expansion coefficient of sendust is approximately 140 x 10-'/'C, the thermal expansion coefficient of ferrite is approximately 120 x 10-', and the thermal expansion coefficient of /'C1 high melting point glass is approximately 100 x t O-'/'C. .

(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 that prevents peeling of a ferromagnetic metal thin film and damage to the magnetic core halves, and has strong bonding strength between the magnetic core halves.

(d) Means for Solving the Problems The present invention comprises a first core half in which a winding groove is formed on the gap forming surface, and a second core half in which a ferromagnetic metal thin film is formed on the gap forming surface. The gap forming surfaces of the first and second core halves are bonded and fixed to each other by a bonding material via the ferromagnetic metal thin film and the gap spacer, and the width of the medium facing protrusion is formed on the end surface on the medium facing surface side. In a floating magnetic head in which a core chip on which a prescribed track width regulating groove is formed is fixed to a slider made of a non-magnetic material, the core chip has the ferromagnetic metal thin film centered on the winding groove on the medium sliding surface side. the first ferromagnetic metal thin film located at the surface and the second ferromagnetic metal thin film located on the opposite side to the medium sliding contact surface, and the lower end of the first ferromagnetic metal thin film on the winding groove side is located outside the track width regulating groove, and the bonding material is in direct contact with the second core half.

Furthermore, the first ferromagnetic metal thin film is deposited over the entire thickness of the second core half, and the lower end of the first ferromagnetic metal thin film is located inside the bonding material. shall be.

(e) Effect According to the above configuration, the end of the ferromagnetic metal thin film where strain is concentrated is not located in the processed portion of the track width regulating groove, and the bonding material is made of a ferromagnetic oxide material with good affinity. The second magnetic core half is in direct contact with the second magnetic core half.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of the core chip of the floating magnetic head of this embodiment, and FIG. 2 is a side view of the core chip.

In the figure, (19a) and (19b) are the first and second core halves made of a ferromagnetic oxide material such as Mn-Zn ferrite, and are placed on the gap forming surface of the first core half (19a). A winding groove (20) and a glass filling groove (21) are formed. Above the winding groove (20) and above the glass filling groove (20)
1) is filled with high melting point glass (22), and the unfilled portion of the winding groove (20) creates a hollow wire window (23).
is configured. On the gap forming surface of the second core half (19b), first and second ferromagnetic metal thin films (241) (2) made of sendust or the like are applied over the entire thickness direction of the core.
42) is deposited on the first and second ferromagnetic metal thin films (241 and 242), respectively. Gap spacers (251) (25) made of non-magnetic insulating materials such as
2) is formed by adhesion. The first and second core halves (
19a) (19b) are the first and second ferromagnetic metal thin films (
241) (242) and gap spacer (251) (
252), and both are bonded and fixed by the high melting point glass (22). A medium facing protrusion (26) is provided on the end surface of the core chip on the medium facing side.
The width t of the medium facing protrusion (26) is defined by the track width regulating groove (27).

The first ferromagnetic metal thin film (241) covers the winding window (23).
), and its lower end (241a) is located within the high melting point glass (22). Therefore, the high melting point glass (22) is in direct contact with the second core half (19b). The gap spacer (251) deposited on the first ferromagnetic metal thin film (241) becomes a magnetic gap (28), and the lower end of the magnetic gap (28) in the gap depth direction is connected to the winding groove (241). ) is defined by the upper end (20a) of Further, the track width of the magnetic gap (28) is equal to the width t of the medium facing protrusion (26). The second ferromagnetic metal thin film (242) is located below the winding groove (20), and the gap spacer (252) formed thereon is located below the winding groove (20).
) is the pack gap part.

Next, a method of manufacturing the above floating magnetic head will be explained.

First, as shown in FIGS. 3(a) and (b), M n −Z
The first and second parts are made of a ferromagnetic oxide material such as n-ferrite.
One of the first substrates (29a and 29b)
A winding groove (20), a glass inserting groove (30), and a glass filling groove (21) are formed on the gear knob forming surface of a).

Further, a ferromagnetic metal thin film (24) made of sendust or the like is deposited on the gap forming surface of the other second substrate (29b), and a gap spacer (25) is covered on the ferromagnetic metal thin film (24). Form a deposit. The ferromagnetic metal thin film (24)
and the gap spacer (25) is connected to the second substrate (29b).
) After forming a thin film over the entire gap forming surface, it is divided into long and narrow islands by performing ion beam etching or the like. At this time, the width W of the ferromagnetic metal thin film (24) and the gap spacer (25) is slightly larger than the desired track width, and the length 2 is the first width W of the ferromagnetic metal thin film (24) and the gap spacer (25).
The lower end (241a) of the ferromagnetic metal thin film (241) is positioned below the track width regulating groove (27) and within the high melting point glass (22) as shown in FIG. ing.

Thereafter, the JJD construction shown in FIGS. 6 to 9 is carried out in the same manner as in the conventional example, thereby completing the Coatin 1 country of this embodiment shown in FIG.

Finally, the floating magnetic head of this embodiment is completed by fitting the Coatin 1 into the storage recess of the slider and filling and solidifying the low melting point glass into the track width regulating groove (27).

In the floating magnetic head of this embodiment as described above, the ferromagnetic metal thin film (24) attached to the second core half (19b)
) is divided into the first ferromagnetic metal thin film (241) and the second ferromagnetic metal thin film (242), so the second core half (
19b) and the ferromagnetic metal thin film is separated, and peeling of the ferromagnetic metal thin film is suppressed. In addition, the first ferromagnetic metal 1 film (241
) The lower end (2418) of the track width regulating groove (27)
Since the second magnetic core half (19b) is located below the high melting point glass (22), damage to the second magnetic core half (19b) due to track width regulating groove (27) processing is prevented, and furthermore, the high melting point glass (22) is directly behind the second core half (19b), so the first and second core halves (19a) and (19b) are firmly joined and fixed.

In addition, in the case of a core chip having a ferromagnetic metal thin film only in the central part of the second core half (19b), rather than over the entire core in the thickness direction, the first ferromagnetic metal thin film (241 Even if the lower end (241a) of
Effects similar to those described above can be obtained.

(G) Effects of the Invention According to the present invention, it is possible to provide a floating magnetic head that suppresses peeling of the ferromagnetic metal thin film and damage of the magnetic core half, and has a core chip with excellent mechanical strength.

[Brief explanation of drawings]

1 to 4 relate to the present invention, FIG. 1 is a perspective view showing the appearance of the core chip, FIG. 2 is a side view of the core chip, FIG. 3 is a perspective view showing the manufacturing method, and FIG. 4 is a perspective view showing the appearance of the core chip. FIG. 3 is a perspective view of the core chip of the embodiment. 5 to 14 relate to conventional examples, FIG. 5 is a perspective view showing the external appearance of the floating magnetic head, and FIGS. 6, 7, 8, and 9 are perspective views showing the manufacturing method, respectively. 10 is a perspective view showing the external appearance of the core chip, FIG. 11 is a view showing film peeling of the core chip, FIG. 12 is a perspective view of main parts of the core chip, FIG. 13 is a view showing damage to the core chip, FIG. 14 is a perspective view showing the state of the core chip before processing. (1)...slider, (19a)...first core half, (19b)...second core half, (20)...winding window, (22)...high melting point Glass, (24)...Ferromagnetic metal thin film, (241)...First ferromagnetic metal thin film,
(241a)...Lower end, (242)...Second ferromagnetic metal thin film, (25) (251) (252)...Gap spacer, (26)...Medium facing protrusion, ( 27
)...Track width regulating groove, (28)...Magnetic gap, (32)...Core chip.

Claims (2)

[Claims] (1) It has a first core half in which a winding groove is formed on the gap forming surface, and a second core half in which a ferromagnetic metal thin film is formed on the gap forming surface, and the first and second cores are The gap forming surfaces of the halves are bonded and fixed to each other by a bonding material via the ferromagnetic metal thin film and the gap spacer, and a track width regulating groove that defines the width of the medium facing protrusion is formed on the end surface on the medium facing surface side. In a floating magnetic head in which a core chip is fixed to a slider made of a non-magnetic material, the core chip is arranged such that the ferromagnetic metal thin film is a first ferromagnetic metal thin film located on the medium sliding surface side around the winding groove. a second ferromagnetic metal thin film located on the opposite side to the medium sliding contact surface, and a lower end of the first ferromagnetic metal thin film on the winding groove side is outside the track width regulating groove. . A floating magnetic head, wherein the bonding material is in direct contact with the second core half. (2) The first ferromagnetic metal thin film is deposited over the entire thickness of the second core half, and the lower end of the first ferromagnetic metal thin film is located inside the bonding material. A floating magnetic head according to claim (1).