JPH03263607A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To decrease the generation of inverse magnetostrictions and to make improvement in performance reliability by fixing the opposite surface side to a disk by secondary glass and further adhering and reinforcing at least one side face of the four side face on the rear side of a chip to the groove of air bearings by a resin or binder. CONSTITUTION:A magnetic head chip 15 formed by constituting a magnetic circuit of a pair of magnetic material core pieces and joining a pair of the core pieces of by primary glass 24 is inserted into the groove 14 provided on the side of the air bearings 12, 13 of a slider 11 consisting of a nonmagnetic material at the outlet end of a magnetic recording medium. The side of the surface of the magnetic head chip 15 facing the magnetic recording medium is fixed by the secondary glass 16. At least one side face of the four side faces on the rear part side 4 of the magnetic head chip 15 is adhered and reinforced to the groove 14 of the air bearings by the resin or binders 18, 19. The height adhered by the resins or binders is specified to >=10% of the width of the magnetic head chip. The generated inverse magnetostrictions are decreased and the improvement in the performance and reliability of the magnetic head is made in this way.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a floating L-type magnetic head (hereinafter sometimes referred to as a "magnetic head or head") used in a fixed magnetic disk device. , especially for performance and reliability,
F. This relates to a flying frame magnetic head.

(Conventional technology) Used in a fixed magnetic disk device, through a gimbal
As a floating magnetic head held on a cantilevered load arm, for example, Japanese Patent Application Laid-Open No. 1-253803,
A floating magnetic head such as that disclosed in Japanese Patent Application Laid-Open No. 1-248303 is used.

Conventionally, the mainstream of disks used as magnetic recording media was to coat an aluminum alloy substrate with oxide magnetic powder.
In response to recent demands for high recording density, disks in which magnetic powder is adhered to a substrate using a plating method, a sputtering method, or the like are becoming mainstream. As a magnetic head used for such a high coercive force disk, for example, a Fe-AQ-8i alloy magnetic thin film 23.2 having a high saturation magnetic flux density is used.
3 is formed into a film by a sputtering method or the like on a mold core 22 made of Mn-Zn ferrite which has high Bs and high magnetic permeability at 1E frequency, and like this I-type core 22,
A magnetic head chip (hereinafter sometimes referred to as "r chip") 1 as shown in FIG. 2 is made by partially bonding a C-shaped core 21 made of Mn-Zn ferrite with glass.
As shown in FIG.
It is inserted into the groove 14 provided at the end of the outflow part of the magnetic head chip and temporarily fixed by a spring member 34, and the glass slab 33 which becomes the secondary glass is heated to flow into the gaps 31 and 32 on both sides of the magnetic head chip. After that, the air bearing surface 12.13 of the magnetic head
After grinding, the winding window 17 of the magnetic head chip is polished.
A floating type magnetic head having a structure as shown in FIG. 4, in which a winding (not shown) is applied to the magnetic head, is used.

Note that a floating magnetic head having a structure in which no alloy magnetic film is formed on the die core 22 is also used.

(Problems to be Solved by the Invention) The conventional floating magnetic head described above uses a core of Mn-Zn ferrite, which has a high Bs and high magnetic permeability at high frequencies, and uses Fe-AQ, which has an even higher saturation magnetic flux density. By forming a film of -5i alloy, it has become possible to support high-density fixed magnetic disks.

However, fixed magnetic disk drives are becoming more dense, i.e.
Along with the increase in capacity, miniaturization and higher frequency have progressed further, creating 11 new problems that need to be solved. The floating magnetic head, which is held by a single-sided load arm via a gimbal, makes light contact with the disk when the disk is stationary due to the force of a spring, but when the disk is rotating, The air on the disk surface moves and a force lifts the bottom surface of the slider, causing it to float away from the disk (0,
(approximately 2 to 0.5 μm). On the other hand, when starting and stopping the rotation of the disk.

A magnetic head slides over the disk. If this levitation is stable, stable electromagnetic conversion characteristics can be obtained. However, in reality, minute upward and downward movements are repeated during seek operations and the like. The interaction between this upward and downward movement and the airflow caused by the rotation of the disk causes vibrations in the entire magnetic head.

This vibration is considered to be a type of self-excited vibration in which the vibration itself gives energy to the magnetic head and the amplitude gradually increases.

Furthermore, such self-excited vibrations may be induced by collisions between microprotrusions on the disk and the slider during flight.

In the conventional floating magnetic head, when the magnetic head chip is embedded and fixed in the air bearing groove of the slider,
Only the side facing the disk is fixed with secondary glass, and the four rear sides of the magnetic head chip are not fixed to the groove and are free. In some cases, only a portion of the side is fixed to the extent that it can withstand processing during slider production, but it is not completely fixed to the slider. Therefore, the amplitude of the vibration transmitted from the slider is amplified, and the magnetic head chip vibrates in a cantilevered state at a frequency different from that of the slider. When the magnetic head chip vibrates, the chip expands and contracts in the height direction and width direction, resulting in deformation.

It is presumed that due to this deformation, the magnetic head chip, which is a magnetic material, exhibits a phenomenon of reverse magnetostriction in which the state of magnetization differs from the initial state of magnetization. In this way, when reverse magnetostriction occurs, the magnetization distribution of the magnetic material that makes up the magnetic circuit changes, causing magnetic flux changes within the magnetic head chip, which generates voltage through the windings and causes noise. This is considered to be a factor in the generation of noise, and has an adverse effect on the S/N ratio between the output S of the magnetic head and the noise N, and on the waveform of reproduction.

Further, in order to generate induced magnetism, it is necessary to provide a winding to the winding S window of the magnetic head chip. Mn-Z with good electromagnetic conversion characteristics is used as the magnetic material of the magnetic head chip.
When using rimitzerite, especially M n-Z n (7) single-crystal ferrite, it is necessary to wind the wire around 20 times on the magnetic head chip held in a cantilevered state when winding the wire. 9. The chip deforms due to the load during winding, resulting in a crystalline structure.9. Therefore, there is also a drawback that there is a high possibility that an opening that causes chipping will occur along the determined plane.

(Means for solving the problem) In order to solve the above problem, claim (1) of the present invention is as follows:
In a floating anaerobic head held on a load arm via a cantilevered gimbal, a pair of magnetic core pieces
1. A magnetic head chip formed by configuring a magnetic circuit by joining the pair of core pieces with primary glass is inserted into a groove provided on the magnetic recorder@medium outflow end side of an air bearing of a slider made of a non-magnetic material. , fixing the side of the magnetic head chip inserted in the groove facing the magnetic recording medium with secondary glass;
At least one side of the rear side of the magnetic head chip is reinforced with a resin or adhesive (the height of the resin or adhesive is 0% or more of the width of the magnetic head chip). The present invention provides a floating magnetic head having the following characteristics.

Claim (2) provides a magnetic head in which the flying magnetic head has a solid content of 70% or less of the solid content of the resin or adhesive; A floating magnetic head made of crystal or single crystal is provided.

(Function) In conventional floating magnetic heads, when inserting and fixing the magnetic head chip into the groove at the outflow end of the air bell of the slider, only the surface facing the disk is fixed with secondary glass, and the magnetic head The four rear side surfaces of the chip are not completely fixed to the groove and are maintained in a free state or a nearly free state. That is, one side is fixed and the other side corresponds to a cantilevered beam or structure with 11 projecting ends. On the other hand, the DH type magnetic head of the present invention has the following characteristics.

When inserting and fixing the magnetic head chip into the groove, the side facing the disk is fixed with secondary glass, and at least one of the four rear sides of the chip is fixed with resin or a fixing agent. ←J, Since it is reinforced with adhesive to the groove of the air bearing, the side facing the disk is fixed, and the rear side is restrained by the resin 5 or the elastic body of the adhesive, so it can be regarded as a barrel structure. Therefore, even if the vibration of the slider propagates to the magnetic spatula 1-tip, the vibration is absorbed and attenuated by the elastic body on the rear side5, and the resulting deformation is not in a free state but is restrained by the elastic body. The deformation is very small compared to the deformation of conventional magnetic head chips. As a result, electromagnetic waves are generated.

Distortion is also small, and the performance and reliability of the magnetic head can be improved.

In addition, since the rear side is restrained by an elastic body, deformation during winding is small, which is particularly problematic when winding is performed when M n -Zn single crystal ferrite is used for the magnetic core. The reason for limiting the upper limit of the solid content to 70% or less is that when it exceeds 70%, the ability to absorb vibration decreases and the generated noise level becomes extremely high. be. The lower limit is not particularly limited, but the desired result is 20% or more. - The adhesion height of the resin or adhesive is 10% or more of the ring of the magnetic head chip. The thing is,
If it is less than 10%, it will not be possible to absorb the vibrations spread from the slider to the magnetic head chip, and the generated noise level will become extremely high. Although the upper limit value of the adhesion height is not particularly specified like the r limit value of the solid material, it seems that the effect is saturated at about 70%.

Example] MnO: 28 mol%, ZnO: 19 mol% in magnetic core
, using a Mn-Zn single crystal material consisting essentially of Fe2O3, with weight percentages of Afl: 6%, Si: 8%, and the balance essentially consisting of Fe, commonly known as sendust.
-A Q -Si A magnetic thin film was formed on the core by sputtering, and a magnetic head chip was formed using the same method as the conventional ε. Next, this chip is, for example, CaTiz○
Insert it into the groove formed in the rear outflow end of the air bearing of the slider configured in step 3, using the same known technique as before.

The disk facing side of the magnetic head chip was fixed with secondary glass. Next, using Aple Bond 410 (trademark of Japan Aple Stech Co., Ltd.), an epoxy adhesive used for slider assembly, we glued the two rear sides of the magnetic head chip so that the adhesive height was approximately 40% of the chip width. After adhering to the air bearing groove of the slider so as to achieve the desired results, finishing grinding and polishing were performed, winding was applied to the chip winding window, and a test was conducted to confirm the noise generation level. Incidentally, the adhesion was carried out in accordance with the Aple Bond standard.

Table 1 shows the results.

Table 1 (Note) Test numbers 2.3, 4, and 5.6 are those in which one side of the two width sides of the head chip are bonded, and 2a and 5a are those in which two sides are bonded.

The noise level represents a relative value when no adhesive is taken as 100.

As is clear from Table 1, compared to the chip in which the rear side of the chip is not bonded, the noise in the chips with a solid content of up to 70% is reduced to 50% or less on a relative level.

However, it can be seen that when the solids content exceeds 80%, the damping effect is extremely reduced.

Example 2 Next, using a magnetic head prepared in the same manner as in Example 1, a noise generation test was conducted by changing the adhesion height on the rear side of the magnetic head chip. The adhesive is Aron Alpha #200S, which is a cyanoacrylate instant adhesive.
(trademark of Toagosei Kagaku Kogyo Co., Ltd.), the solids content was kept constant at 50%, and the adhesive on the rear side was applied to 3 sides: 1 side and 2 sides of the width, 2 sides of the width and 1 side of the thickness. This was done for the case of Adhesion was performed according to Aron Alpha standards.

Table 2 shows the results.

Table 2 (Note) 2, 3.4 is the total of 1 side of the 2 sides of the chip width, 2a, 3a, 5a are the 2 sides, and 6b is the total of the 2 sides of the width and the side of the chip thickness. It has three sides glued together.

The height of the adhesive surface indicates the ratio of the adhesive height to the chip width.

The noise level indicates a relative value when the non-adhesive head is set as 100.

From Table 2, it can be seen that compared to the non-adhesive magnetic head, the relative level is clearly lower when the adhesive thickness is 1-0% or more of the chip width. .

However, when comparing 7.40% and '70% glenth, the levels are approximately equal, so it is thought that adhesion up to 70% can achieve the purpose. 1. In the examples, only Examples 1 are described in which adhesives such as Ablebondhi and Aron Arsoa are used as resins and adhesives, but similar effects can be expected with other resins and adhesives. In addition, although Mn-Zn single-crystal ferrite has been given as an example as the magnetic herad core material, polycrystalline ferrite may also be used, and anaerobic heads using other magnetic materials and metal magnetic phosphor films can also be formed. Needless to say, the application to a magnetic head that does not have a magnetic head is also included in the scope of the claims of the present invention.

(Effects of the Invention) As is clear from the above embodiments, the magnetic head of the present invention has a high density, a large capacity, a small size, and a high frequency fixed disk (; There is little noise generated due to reverse magnetostriction, which is thought to be caused by magnetostriction, and the S/N ratio of the noise N to the output of the magnetic head is small, and a good reproduced waveform can be obtained, improving performance and reliability. 9. It becomes possible to provide a magnetic head with 7.

[Brief explanation of drawings]

FIG. 1(a) Perspective view of the floating magnetic head of the present invention, 1st
Figure (b) is an enlarged view of the area around the magnetic head chip, Figure 2 is a perspective view of the magnetic head chip, Figure 3 is a diagram showing the method of adhering the magnetic head chip with secondary glass, and Figure 4 is a conventional floating glass. FIG. 4 is a perspective view of the magnetic head. 12.13. ,,air bearing is,,,magnetic head chip 17,,,winding window adhesive 22),,I core 24,,,-part glass 11,,,slider 14,,,groove 16,,,secondary Glass 18.19. ,,Resin 21,,C core 23, 23',,Magnetic thin film 25,,,Magnetic head chip rear side 26,,,Magnetic head chip thickness 27°0. Magnetic head chip width: 28°, magnetic head chip height: 31°, 32°. 1 gap 33°1. glass rod 34,
,,Spring material 3rd issue Figure 4 39

Claims (3)

[Claims] (1) In a floating magnetic head held on a cantilevered load arm via a gimbal, a magnetic circuit is formed by a pair of magnetic core pieces, and the pair of core pieces are bonded together using primary glass. The magnetic head chip thus prepared is inserted into a groove provided on the outflow end side of the magnetic recording medium of the air bearing of the slider made of a non-magnetic material, and the surface side facing the magnetic recording medium of the magnetic head chip inserted into the groove is covered with secondary glass. At least one of the four rear side surfaces of the magnetic head chip is bonded and reinforced with the groove of the air bearing using a resin or adhesive, and the height of the adhesive with the resin or adhesive is the height of the magnetic head chip. A floating magnetic head characterized in that the width is 10% or more of the width of the floating magnetic head. (2) A floating magnetic head according to claim 1, wherein the solid content of the resin or adhesive is 70% or less. (3) In the magnetic head according to claim 1 or 2, the magnetic core piece is Mn-
A floating magnetic head made of polycrystalline or single crystalline Zn ferrite.