JPS6288112A - Floating type magnetic head stable in reproducing output - Google Patents

Abstract

PURPOSE:To realize a magnetic head whose reproducing output is scarcely varied against a variation of a floating quantity, by crossing diagonally alloy thin films at 30-120 deg., when joining the alloy thin films on a pair of V-shaped substrates through a gap part. CONSTITUTION:Alloy thin films 3, 4 having a high saturation magnetic flux density are formed on V-shaped substrates 1, 2, and the substrates 1, 2 are joined through a magnetic gap 6. In that case, the alloy thin films, 3, 4 are crossed diagonally at an angle of 30-120 deg.. When such a head is used, its reproducing output becomes stable extremely against a variation of a floating quantity. Its reason is not clear, but it is considered that it is caused by a fact that a distribution of a magnetic flux which leaks from the magnetic gap is different from that of a magnetic head of a conventional constitution. Therefore, a head whose reproducing output is stable against a variation of the floating quantity being indispensable for a high density recording can be obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a magnetic head used in an external storage device for a combination, in particular, a magnetic head that is levitated with an extremely small gap relative to a recording medium for recording and reproducing. This relates to a magnetic head that performs this, and its purpose is to obtain a stable reproduction output while flying.

(Prior Art) Conventional so-called floating magnetic heads, which are used to rotate a magnetic recording medium at high speed and levitate a magnetic head for recording and reproducing, are as follows: 1) An integrated type made of Nl-Za or Mn-Za ferrite. Monolithic type 2) Mu-
Composite type in which a magnetic core made of Zn is embedded in a non-magnetic slider and fixed with glass, and 3) At20
A so-called thin film head is used in which a magnetic core portion is provided on the side surface of a nonmagnetic slider such as 3-Tic. Figure 5 is a diagram showing the outline of a monolithic magnetic head.25.26
is Ni-2116 or Mn-Zn ferrite,
27 is a magnetic gear lug. FIG. 6 is a schematic diagram of a composite magnetic head, and 28 is a non-magnetic slider;
Reference numeral 29 represents an embedded magnetic core, 30 represents a magnetic gear lug, and 31 represents a glass to which the magnetic core is secured.

An enlarged view of this composite magnetic core is shown in FIG. 32 is a magnetic gap, and C is joined by a lath 33.
It is composed of Mn-Zn ferrites of type 34 and type 1 35. Cutting portions 36 are provided in the ferrite portion facing the recording medium as a means for realizing a narrow track, and 37 in FIG. 7 corresponds to the track width. Furthermore, the eighth
The figure is a schematic diagram of a thin film head, and 38 is made of At20. - The magnetic core portion 39,40 of the slider made of an oxide non-magnetic material such as T i C is located on one side of the slider, that is, on the side of the air outflow end when flying. FIG. 9 shows the shape of the magnetic material arranged through the magnetic hole 7' 41 when this magnetic core section is viewed from the medium facing surface side. 42 and 43 are the magnetic materials. In many cases, a film formed from an F.-N1 alloy by a snotter or plating method is used.

As mentioned above, the magnetic heads conventionally used in floating magnetic recording devices can be broadly classified into the above three types, but in all of these, the structure of the magnetic gear lug is such that the magnetic body on both sides of the magnetic gear lug is It is simply formed on a flat surface. That is, they have a common structure in that the magnetic gear lug is formed of a planar magnetic material. Detailed studies by the inventors have revealed that the magnetic head having such a gear lug configuration has a disadvantage in that the rate of change in reproduction output is large with respect to fluctuations in flying height, as will be described in detail later.

On the other hand, in order to achieve high-density recording, recording media with higher coercive force are being used in order to reduce demagnetization during recording. In contrast to this tendency, when a magnetic head undergoes magnetic saturation during recording, sufficient recording becomes impossible. Therefore, the saturation magnetic flux density of a magnetic material is soo.

Attempts have been made to construct a magnetic head by depositing an alloy magnetic material as large as 7000G or more on a substrate as a thin film that is easy to precisely process, compared to the small Mlow za7 elite of ~5500G (gauss). From this point of view, it is desirable to construct a magnetic circuit using a magnetic material with a high saturation magnetic flux density as the magnetic body.Among the conventional magnetic heads mentioned above, the thin film head has a saturation magnetic flux density of 9 to 10 kG.
Although it is advantageous in that it uses an N1 alloy thin film, it is undesirable because the rate of change in reproduction output with respect to the flying height is large due to the structure of the magnetic part as described above.

It is easy to understand that it is important to reduce the rate of change in reproduction output with respect to fluctuations in flying height, but this will be explained in more detail below. In other words, in order to achieve high-density recording, it is necessary to reduce the flying height as much as possible.
r Storage fdustry 5service
(edited by Rigld Disk Dr1v*), 1984 edition, pages 2.2-6. According to this description, the flying height has decreased to 10 microinches (0.25 μm).It is difficult to constantly levitate the magnetic head stably with an extremely small flying height like a spear, and efforts to stabilize the flying height are difficult. Although many attempts have been made to do so, some degree of variation in the flying height is unavoidable, and it is therefore easy to understand that it is preferable for a magnetic head to obtain a reproduction output that is more constant against variations in the flying height.

Therefore, the present invention relates to a configuration for obtaining a magnetic head that uses a thin alloy film with a high saturation magnetic flux density as a magnetic material and has a small change in reproduction output with respect to fluctuations in flying height when used at a low flying height.

(Problems to be Solved by the Invention) As stated above, the present invention uses an alloy magnetic thin film with a high saturation magnetic flux density that can sufficiently record even on high coercive force recording media, and solves the drawbacks of conventional magnetic heads. This is intended to solve the problem that the rate of change in reproduction output is large with respect to fluctuations in flying height.

(Means for Solving the Problems) The present invention has a magnetic head in which a thin alloy film with high saturation magnetic flux density is formed on a V-shaped substrate, and this pair of substrates are bonded via a gear lag regulating film. The above problem is attempted to be solved by appropriately selecting the angle of the V-shaped portion. By setting the oblique angle θ of the V-shaped portion to 30 to 120 degrees, the reproduction output can be stabilized against fluctuations in flying height.

FIG. 1 is a schematic diagram of a magnetic core portion according to an embodiment of the present invention. 1.2 is a substrate, 3.4 is an alloy thin film with high saturation magnetic flux density,
5 is a wire-wound window, 6 is a magnetic gear lug, and 7.8 is a bonded glass. TV is the track width. In order to obtain a magnetic core having such a configuration, a half pair of substrates 10 having a C groove 9 shown in FIG. 2 for the winding window 5 is prepared. There is a V-shaped protrusion 18 on the board.
is provided. Alloy thin film 11 with high saturation magnetic flux density on the substrate
is formed by sputtering, physical means such as ion grating, or chemical means such as plating, preferably by sputtering. Thereafter, a portion of the thin film is removed by polishing or the like up to the line connecting 12 and 12'. Furthermore, a similar half core pair without the C groove part was created, and a C groove was provided.
Alternatively, a gap regulating film is formed to a predetermined thickness on either or both of the polished surfaces.

Next, these two lamps are made to face each other, and a lath is introduced into the groove 13 to join them. After joining, the line connecting 14.15 and 16.17
The magnetic core shown in FIG. 1 is obtained by cutting along the line connecting the two. In FIG. 1, the alloy thin films on both sides of the gap are obliquely intersecting each other at an angle θ. The magnetic core can be used as a floating magnetic head by embedding the magnetic core in the non-magnetic slider 28 shown in FIG. 6 or by fixing it with resin. A magnetic core having such a structure has already been proposed in Japanese Patent Application Laid-Open No. 58-175122. However, in these precedents, a 7-groove shaped alloy thin film is formed on a flat substrate, and the purpose thereof is to prevent the formation of a pseudo gap. There are various improvements and devices for the head structure to prevent this false gap, such as Japanese Patent Publication No. 46-16353 and Japanese Patent Publication No. 54-9601.
3. Examples can be found in U.S. Pat. No. 2,902.544. Therefore, the magnetic core configuration proposed in JP-A-58-175122 etc. is a configuration method for preventing pseudo gaps, but in the present invention, regardless of the occurrence of such pseudo gaps, the magnetic core configuration is It was discovered that the output was stable.

In the present invention, the substrate on which the thin film is formed may be a magnetic oxide such as ferrite or a non-magnetic oxide such as TIO-C.
a O-At20s-T I C-Mn0-N l
Any material such as O, or even a lath composition such as crystallized glass can be used. In addition, as a thin film material, Fe
-Crystalline materials such as At-8l, Fe-81, Fa-Ni or Co-Nb-Zr #Co-T*
- Any amorphous material such as Zr is possible. These thin films may be a single layer, or may be laminated with an insulating layer interposed therebetween for the purpose of improving magnetic permeability at high frequency 1c. F
- When using -kl-81, the composition is kl 3 to 7 at%
, Si is 7 to 11at (i and F'e are 82 to 90
at %, more preferably At 4.5 to 6.5 at %,
Si 8.0~10.5 ate, F*83~87
at %. Also, Co − is an amorphous material.
In the case of Nb-Zr, Co81-92 ate, Nb
6 to 12 at% #Zr 2 to 7 at%, preferably Co82 to 86 at%.

Nbl 1-l 3 at'%, Zr 3-5 at
It is e.

FIG. 3 is a diagram showing another embodiment of the present invention.

19 is a board that also serves as a slider, and 20 is a gap.

21 is an alloy thin film, 22 is a winding window, and 23 is a pawl groove for attaching a gin nozzle. In the gap part, a pair of alloy thin films obliquely crossed at an angle θ are fixed in a positive direction through an ear, as in FIG.

FIG. 4 is an enlarged view of the gap portion in FIG. 3, in which a pair of thin films obliquely crossed at an angle θ are joined by a lath 24 via a gap 20.

The configurations shown in Figures 1 and 3 differ depending on whether the magnetic core is prepared in advance and fixed in the slider, or whether the magnetic core also serves as the slider.
They are the same in that they have a structure in which a pair of diagonal alloy thin films are bonded together. Therefore, with the configuration shown in Figure 3, the slider (
The same applies to what materials can be used as the substrate material and the alloy thin film material.

Examples are shown below.

[Example 1] AA was deposited on a Mn-Zn ferrite substrate having the shape shown in Fig.
5.1at%, 819. Oate, Fa 85.
A single-layer film having a composition of 9 atqb and a thickness of 5 μm was formed using Su-Gutsuta. The oblique angle θ is 60 degrees. the pair as the second
Following the process explained with the diagram, the track width is 15 μm.
, after processing into a magnetic core with an Iazzo length of 0.85 μm, Tl
The embedded material was fixed in the 0-CaO slider with laths to obtain a magnetic head. The magnetic head was made of He 7000s Co-
The first report compares the relationship between the flying height and the reproduction output with other magnetic heads at a frequency of 2.5 MHz using a 5.25-inch S-4 disk with a Ni alloy thin film as its magnetic layer.
Shown in the table.

In Table 1, the reproduction output when the flying height is 0.25 μm is set as 100, and the reproduction output when the flying height is changed is expressed as a percentage of the above. Mu-Z used for comparison
aThe track widths of the monolithic head and thin film head are 22 and 18 μm, respectively, and the gap length is 0.8, respectively.
3, 0.85 μm. As is clear from the first example, the magnetic head according to this embodiment has a smaller change in reproduction output with respect to fluctuations in flying height than other magnetic heads.

[Example 2] A Fe-At-8i film with the same composition as in Example 1 was coated with Tl0-C
A film was formed on an aO substrate at an oblique angle of 045 degrees. Thereafter, the same processing as in Example 1 was performed to obtain a magnetic head having a track width of 18 μm and a gap length of 0.75 to 0.8 μm. 2. Using the medium of Example 1, samples were prepared with different film thicknesses and number of laminated layers.
The results measured at 5 MHz are shown in percentages in Table 2. Incidentally, the laminated layer was an insulating layer, and a 0.1 μm sio□ film was used as an insulating layer.

Table 2 [Example 3] Co84at film on Ma-Za 7 elite substrate,
Three layers of alloy thin films having a composition of Nb13at'% e Zn3at% were laminated with a thickness of 3 μm at an oblique angle of 075 degrees. After that, the same processing as in Example 1 was performed, and the track width was 13.
Magnetic cores with earcup lengths varied in μm were obtained. The magnetic core was heated and fixed in a T1ω00 slider using a two-component epoxy resin to obtain a magnetic head. Table 3 shows the results of the same measurements as in the above example.

3rd Shigeru [Example 4] Co of Example 3 was deposited on a T10-CaO substrate by changing the oblique angle θ.
-Nb-Zr thin films were formed in two layers with a thickness of 5 μm, and the pair was fixed with glass to obtain the magnetic core shown in FIG. 2. The gap length is 0.80 μm) and the rack width is 19 μm.

The magnetic core was fixed in a T10-CaO slider made of the same material using the resin of Example 3 to obtain a magnetic head. Similar measurement results are shown in Table 4.

Table 4 As is clear from Table 4, when the oblique angle θ is between 30 and 120 degrees, the reproduction output is stable, but at other times the reproduction output changes significantly to the same extent as the MIl-Zn monolithic type and thin film head.

[Example 5] The Co-Nb-Zr thin film of Example 4 was formed on a Mn0-Ni0 nonmagnetic substrate with a two-layer diagonal angle of 5 μm and an oblique angle θ=90 degrees.

The pair was processed into the magnetic head shown in FIG. 3, and the same measurements were carried out. The results are shown in the fifth thorn.

Table 5 As detailed above, the magnetic head according to the present invention has a structure in which alloy thin films are formed diagonally on a V-shaped substrate, and the pair is joined via a magnetic ear lug, thereby achieving a magnetic head that is not conventionally known. This flying type magnetic head is suitable for high-density recording because it has been found that the reproduction output is stable against fluctuations in flying height. The reason for this is not clear, but considering that the change in reproduction output depends on the oblique angle, it is presumed that the distribution of magnetic flux leaking from the magnetic gap is different from that of a magnetic head with a conventional configuration. When processing a substrate into a V-shape, the apex of the V-shaped protrusion tends to become somewhat flat due to chipping, etc., but even if a chip of several μm occurs, the alloy thin film is clearly recognized to be diagonal. The same effect can be obtained if the condition is moderate.

In addition, although the example shows the case where the left and right pairs are obliquely intersecting at the same angle θ, as is clear from the points already mentioned, the same effect cannot be obtained even if the left and right pair are obliquely intersecting at different angles. It's obvious.

〔Effect of the invention〕

As is clear from the above, the magnetic head according to the present invention exhibits the effect that the change in reproduction output is small in response to fluctuations in flying height, which are essential for high-density recording, and has great industrial utility value.

[Brief explanation of drawings]

FIG. 1 is an overview diagram of a magnetic core according to one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the state of thin film formation to obtain the magnetic core of FIG. 1, and FIG. 3 is a diagram showing another embodiment. It is an overview diagram. FIG. 4 shows an enlarged view of the gap portion in FIG. 3, and FIG. 5 shows an overview of the monolithic magnetic head. FIG. 6 shows an overview of a composite magnetic head, and FIG. 7 shows an enlarged view of a magnetic core embedded and fixed in the slider of FIG. FIG. 8 is a general view of the thin film head, and FIG. 9 is a schematic diagram of the gear lug configuration when the magnetic core portion of FIG. 8 is viewed from the air bearing surface. 1.2: Substrate, 3, 4: Alloy magnetic thin film, 5: Winding window, 6
: Magnetic gap, θ: Oblique angle box Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In a magnetic head, a thin alloy film of high saturation magnetic flux density is formed on a substrate having V-shaped protrusions made of magnetic and non-magnetic oxides or glass compositions, and a pair of these are bonded via a magnetic gap layer. A flying magnetic head whose reproduction output is stable despite fluctuations in flying height, characterized in that alloy thin films are obliquely crossed at an angle of 30 to 120 degrees.