JPH08180317A - Core thin-film magnetic head - Google Patents

Abstract

PURPOSE: To obtain a magnetic head which does not saturate the magnetic metallic thin film on the trailing side of the core thin-film magnetic head having a steep recording magnetic field even if the core thin-film magnetic head has an extremely small gap depth. CONSTITUTION: This head consists of a winding window 5 which is formed on the opposite surfaces of a pair of nonmagnetic substrates 3, 3, the magnetic metallic thin films 2 which are formed on the opposite surfaces of these nonmagnetic substrates 3, 3 including the winding window 5 and a magnetic gap 14 which is formed by disposing the magnetic metallic thin films 2, 2 of the apex part of the winding window 5 across a magnetic gap material. The depth in the gap depth direction of the opposite parts of the magnetic metallic thin films 2 forming the magnetic gap 14 is formed deeper at the magnetic metallic thin film 12 on the trailing side than the magnetic metallic thin film 13 on the leading side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording device such as an HDD, and mainly relates to a magnetic head using a metal magnetic thin film as a magnetic core, and is particularly suitable for high density recording with a small gap depth. Core thin film magnetic head.

[0002]

2. Description of the Related Art In recent years, in the field of magnetic recording, there is an increasing demand for higher recording density, and higher data speed is also required. From this point, in particular, a magnetic core is formed by using a magnetic material having high magnetic permeability and high saturation magnetic flux density, and
A magnetic head with a small inductance has been demanded.

Particularly, recently, a core thin film magnetic head has been attracting attention as a magnetic head which can satisfy the above-mentioned performance while diverting the conventional method of manufacturing a bulk type magnetic head. The core thin-film magnetic head is one in which a magnetic core is formed of a metal magnetic thin film on a non-magnetic substrate, and various types have been proposed, but from the viewpoint of reducing the inductance, it is described in Japanese Patent Publication No. 6-54528. Things are receiving attention. As shown in FIG. 6, this magnetic head forms metal magnetic thin films 2 and 2 along a winding window 5 provided on the opposing surfaces of a pair of non-magnetic substrates 3 and 3. The metal magnetic thin films 2 and 2 form a gap material. To form a magnetic gap 14 and are integrated with glass 4 or the like to form a core thin film magnetic head.

In this type of core thin film magnetic head manufacturing method, as shown in FIG. 7, winding grooves 15, 15 are formed on the opposing surfaces of a pair of non-magnetic blocks 9, 9 using a dicer or the like (a). , FeAlSi, FeTaN, FeNi on this surface
(B) by forming metal magnetic thin films 2, 2 of
15 facing each other, and the rods 40 made of glass or the like in the winding grooves 15, 15.
Is inserted and welded in a welding furnace, both are bonded and integrated (c), and the core thin film magnetic head 8 is formed by slicing with a slicer (d). This integration step (c)
In the above, the gap depth end portion 11 was integrated so as not to shift as much as possible. This is because if this portion shifts, extra inductance will occur.

Recently, there is a large tendency to reduce the area of the metal magnetic thin film exposed on the sliding surface of the medium as a whole, and as shown in FIG. 8, the purpose is to reduce the magnetization transition region of the recording magnetization of the medium, that is, The area T exposed on the medium sliding surface of the metal magnetic thin film 22 on the medium outlet side, that is, on the trailing side, for the purpose of making the recording magnetic field of the magnetic head steep.
Is also made smaller than the area U exposed on the medium sliding surface of the metal magnetic thin film 23 on the medium entrance side of the magnetic head, that is, on the leading side. This is because it is the trailing-side metal magnetic thin film 22 that determines writing to the medium in the magnetic core, and the exposed area of the metal magnetic thin film to the medium is reduced to reduce the magnetic flux. , To increase the vertical component of the recording magnetic field. As such a magnetic head, for example, Japanese Patent Laid-Open No.
There is one described in Japanese Patent No. 193307.

[0006]

In the above-mentioned core thin film magnetic head, the need for reducing the gap depth has increased due to recent trends in magnetic recording technology. However, the recording / reproducing characteristics of the core thin film magnetic head with a small gap depth are increased. The problem of being inadequate has surfaced. For example, in recent magnetic heads, those having a gap depth of 4 μm or less, particularly those having a gap depth of 1 μm or less are being manufactured as those used in hard disk devices.

As a result, the core thin film magnetic head having a small gap depth increases the head tip portion, especially the vertical component of the magnetic field of magnetic recording, even if the currently known material having the highest saturation magnetic flux density is used. In addition, magnetic saturation has become remarkable in the metal magnetic thin film portion of the magnetic core on the trailing side where the medium sliding area is small. This is because the volume of the metal magnetic thin film in this portion is too small. This seriously hinders the recording / reproducing ability of the magnetic head, particularly the recording ability, and hinders the increase in recording density.

[0008]

To solve the above problems, the present invention provides a core thin film magnetic head comprising a pair of non-magnetic substrates and a metal magnetic thin film formed on the pair of non-magnetic substrates. Then, a winding window is formed on the opposing surfaces of the pair of non-magnetic substrates, the metal magnetic thin film is formed on an inner peripheral surface including the apex portion of the winding window, and the apex portion of the winding window is formed. A magnetic gap is formed by sandwiching a metal magnetic thin film with a magnetic gap material sandwiched between them, and the depth in the gap depth direction of the facing portion of the metal magnetic thin film forming the magnetic gap is larger on the trailing side than on the leading side. A deeply formed core thin film magnetic head is provided.

The core thin film magnetic head is characterized in that the area of the portion of the metal magnetic thin film exposed on the medium sliding surface is smaller on the trailing side than on the leading side.

Furthermore, the core thin film magnetic head is provided in which the contact angle of the metal magnetic thin film with the medium sliding surface is larger on the trailing side than on the leading side.

The core thin film magnetic head is provided in which the contact angle of the metal magnetic thin film forming the magnetic gap with the trailing side medium sliding surface is 20 to 60 degrees.

[0012]

Since the present invention has the above-described structure, the area exposed to the medium sliding surface of the metal magnetic thin film is made small as usual, and the depth of the metal magnetic thin film on the trailing side of the magnetic gap portion in the gap depth direction is reduced. Since the depth becomes deep and the volume of this portion can be made large, magnetic saturation does not occur even when the gap depth is extremely small. Therefore, the perpendicular component of the recording magnetic field from the core thin film magnetic head can be increased without causing magnetic saturation of the magnetic core.

Further, according to the present invention, the angle of the trailing side metal magnetic thin film with respect to the medium sliding surface is made larger than the angle of the leading side metal magnetic thin film with respect to the medium sliding surface, whereby the volume of the trailing side metal magnetic thin film is increased. Since the value is increased, such an effect can be realized by a very simple manufacturing method.

Further, since the angle formed between the trailing side metal magnetic thin film and the medium sliding surface is set to 20 to 60 degrees, magnetic saturation does not occur even when the gap depth is sufficiently small and the core thin film magnetic head is wound. The mechanical strength of the upper part of the wire window can be sufficiently secured.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Incidentally, the same parts as those of the conventional one are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 1, the core thin film magnetic head of the present invention has a winding window 5 formed on a pair of non-magnetic substrates 3 and 3 by using a dicer or the like, and a winding window 5 is formed on the opposing surfaces of the non-magnetic substrates 3 and 3. FeTaN, FeTaC, F on the inner peripheral surface of the wire window 5
eTaNCu, FeTaNC, FeMoN, FeCo
N, FeCN, FeTaNAg, FeAlSi, NiF
The metal magnetic thin films 2 and 2 such as e are formed by sputtering, vapor deposition, etc., the magnetic gap material is sandwiched between the metal magnetic thin films 2 and 2 to form the magnetic gap 14, and both substrates are formed using glass 4 or the like. The core thin film magnetic head 20 is formed by welding and integration.

At this time, as shown in the enlarged view of FIG. 3, the metal magnetic thin film 12 on the trailing side is the leading side of the metal magnetic thin film 12 facing the apex portion 50 forming the magnetic gap 14 of the metal magnetic thin film. The two substrates are integrated by being shifted slightly below the metal magnetic thin film 13.
By doing so, the depth D in the gap depth direction on the trailing side becomes deeper, and as a result, this volume can be increased, so that the portion S where the metal magnetic thin film on the trailing side is exposed on the medium sliding surface is small. Nevertheless, the metal magnetic thin film 12 on the trailing side is never magnetically saturated. At this time, if the gap depth end portion 19 is displaced by 10 to 50% with respect to the gap depth, a sufficient volume of the metal magnetic thin film that does not saturate can be secured, so in most cases 0.2 μm to 2.0 μm. It is enough to shift it.

More specifically, the method of manufacturing the core thin film magnetic head will be described. Since the core thin film magnetic head is formed by slicing a long block for mass production, the process is as shown in FIG. That is, the winding grooves 35, 35 are processed by a dicer or the like along the length direction of the block composed of the long nonmagnetic blocks 30, 30 (a). Then, metal magnetic thin films 32, 32, for example, FeTaN alloy are formed on the opposing surfaces of both blocks to form a gap material S.
iO2 or the like 33 is formed (b), and the positions of both blocks are adjusted so that the winding windows are formed so that the winding grooves 35, 35 face each other, and then the glass rod 40 is fitted into the winding groove 35,
It is placed at 35 and put in a welding furnace to be fused and integrated (c).

At the stage of position adjustment before entering the welding furnace, both blocks are semi-fixed to the welding jig 41 as shown in FIG. 4, and the welding jig 41 is placed on the position adjusting jig 44 to fix the welding. This is fixed with the tool fixing screw 46, and the micrometer 45
Also, the gap 42 on the gap depth end 3 of the non-magnetic material block 30, 30 is formed by the spring 42 on the opposite side of the non-magnetic material block.
1 is observed from the side with a microscope (not shown), and the trailing side is aligned to the lower side when viewed from the medium sliding surface side with a deviation amount of about 0.2 μm. When the alignment is completed, the non-magnetic blocks 30, 30 are fixed with the block fixing screws 43, and a glass rod or the like (not shown) is inserted into the winding groove 47,
Loosen the welding jig fixing screw 46 and put the welding jig 41 in a welding furnace (not shown) to integrally weld both blocks.

If the blocks thus integrated are sliced by a slicer or the like, a plurality of core thin film magnetic heads 20 having the same gap depth end deviation can be obtained at a time as shown in FIG. 9D. I can. Various ceramics and various glass substrates can be used as the non-magnetic substrate used in the core thin film magnetic head.
As the gap material, SiO2, Al2O3 or the like, or a laminated film of these and a certain metal material can be used.

In order to make the area of the trailing-side metal magnetic thin film exposed on the medium sliding surface smaller than the area of the leading-side metal magnetic thin film exposed on the medium sliding surface, in the above step (b), The film thickness of the metal magnetic thin film on the ring side is made thinner than that of the metal magnetic thin film on the leading side. Specifically, for example, when the track width is 1 μm, the film thickness of the metal magnetic thin film on the leading side is 1 μm, and the film thickness of the metal magnetic thin film on the trailing side is 0.2 to 0.5 μm.
It should be about.

The angle formed by the trailing-side metal magnetic thin film with the medium sliding surface is made larger than the angle formed by the leading-side metal magnetic thin film with the medium sliding surface, and furthermore, the trailing-side metal magnetic film medium is formed. The contact angle with the sliding surface is 20 ~
When the volume of the metal magnetic thin film on the trailing side is increased to 60 degrees, when the grooves are formed in the long blocks 30 by a dicer or the like in the step (a) of FIG.
As shown in FIG. 5, the long block may be grooved by using the diamond blade portions 37, 39 on the outer periphery of the metal supporting portions 36, 38 of the dicer blades having desired tip angles α, β. In this way, as shown in FIG. 2, the metallic magnetic thin film formed by sputtering or the like is also formed on the medium at an angle α, β with the medium, that is, a desired angle of 20 to 60 degrees.

As described above, if the contact angle β of the trailing-side metal magnetic thin film 17 with the medium sliding surface is made larger than the contact angle α of the leading-side metal magnetic thin film 18 with the medium sliding surface, the above description will be given. In contrast to the embodiment described above, the gap depth end portion 19 can be precisely aligned, so that the disadvantages of the gap depth end portion 19 being displaced while maintaining the advantages of the embodiment shown in FIG. An increase in unnecessary inductance and a decrease in magnetic resistance at the magnetic gap can be suppressed.

When the contact angle β of the metal magnetic thin film 17 on the trailing side with the sliding surface of the medium is 20 degrees or less, the structural strength of the winding window upper portion 21 becomes weaker, and when it is 60 degrees or more, the winding window is reduced. Short-circuiting of the magnetic flux (shown by the arrow) occurs at the portion, which is not preferable.

[0024]

According to the above-described structure of the core thin film magnetic head, even if the magnetic gap depth is very small, magnetic recording and reproduction can be performed without magnetic saturation, so that recording and reproduction with high recording density can be performed.

[Brief description of drawings]

FIG. 1 is a side view of a core thin film magnetic head according to the present invention.

FIG. 2 is a side view of a core thin film magnetic head in which the trailing side angle is larger than the leading side of the core thin film magnetic head according to the present invention.

FIG. 3 is an enlarged view of a gap portion of a core thin film magnetic head according to the present invention.

FIG. 4 is a perspective view showing how the core thin film magnetic head according to the present invention is positionally adjusted and welded by a jig.

FIG. 5 is a partially enlarged front view showing a tip shape of a winding window processing blade of a core thin-film magnetic head according to the present invention. FIG. 5 (a) shows a tip shape of a blade for processing a winding groove on a leading side. , Shows the tip shape of the blade that processes the winding groove on the trailing side

FIG. 6 is a side view of an example of a conventional magnetic head.

FIG. 7 is a perspective view showing a magnetic head manufacturing process according to a conventional technique. FIG. (B) is a figure which shows a metal magnetic thin film forming process. (C) is a figure which shows a welding process.
FIG. 6D is a diagram showing a step of slicing the magnetic head chip.

FIG. 8 is a side view of another example of the conventional magnetic head.

FIG. 9A is a perspective view showing a manufacturing process of the core thin-film magnetic head according to the present invention, and FIG. 9A is a view showing a groove processing process. (B) is a figure which shows a metal magnetic thin film forming process. (C) is a figure which shows a welding process.
FIG. 3D is a diagram showing a step of slicing the core thin film magnetic head chip.

[Explanation of symbols]

 2 Metal magnetic thin film 3 Non-magnetic substrate 5 Winding window 12 Metal magnetic thin film on trailing side 13 Metal magnetic thin film on leading side 14 Magnetic gap 16 Gap depth end part

Claims (4)

[Claims] 1. A core thin-film magnetic head comprising a pair of non-magnetic substrates and a metal magnetic thin film formed on the pair of non-magnetic substrates, wherein a winding window is provided on an opposing surface of the pair of non-magnetic substrates. And the metal magnetic thin film is formed on an inner peripheral surface including an apex portion of the winding window, and the metal magnetic thin film of the apex portion of the winding window is faced with a magnetic gap material sandwiched therebetween. A core thin-film magnetic head in which a magnetic gap is formed, and a depth of a facing portion of the metal magnetic thin film forming the magnetic gap is deeper on a trailing side than on a leading side. 2. The core thin film magnetic head according to claim 1, wherein the area of the portion of the metal magnetic thin film exposed on the medium sliding surface is smaller on the trailing side than on the leading side. 3. The core thin film magnetic head according to claim 2, wherein the contact angle of the metal magnetic thin film with the medium sliding surface is larger on the trailing side than on the leading side. 4. The contact angle of the metal magnetic thin film forming the magnetic gap with the sliding surface of the medium on the trailing side is 20.
4. The core thin film magnetic head according to claim 3, wherein the core thin film magnetic head is about 60 degrees.