JPH0574092A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To prevent the fluctuation in electromagnetic conversion characteristics by constituting the slider of the magnetic head of alpha-Fe2O3 and enhancing a CSS characteristic without subjecting the slider to large crowning. CONSTITUTION:The slider 1 of the magnetic head is formed with a magnetic core 4 between two substrates 1b made of alpha-Fe2O3. This magnetic core 4 is formed by alternately laminating magnetic metallic layers 4a consisting of an Fe-Al-Si alloy, amorphous magnetic alloy, amorphous magnetic alloy, Fe-Ni alloy, etc., having a high saturation magnetic flux density and high magnetic permeability and insulating layers 4b consisting of SiO2, Al2O3, etc., by a sputtering method. A crown height which is a difference between the peak point of the curved part when the medium-facing surface of the slider is worked to curve and the height up to the boundary of a tapered part is increase and the coefft. of dynamic friction is decreased by using alpha-Fe2O3 as the material constituting the slider in such a manner. Then, the CSS characteristic is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device used for an external storage device of a computer, and more particularly to a floating magnetic head used for a fixed magnetic disk device.

[0002]

2. Description of the Related Art As a conventional floating type magnetic head,
Monolithic type, composite type, thin film type, etc. are known. The monolithic type uses the same magnetic ferrite as the slider material and the magnetic core, and the composite type molds the magnetic core of magnetic ferrite on a non-magnetic substrate with glass,
The thin film type has a structure in which a thin film magnetic core is formed on a non-magnetic substrate. Generally, CaTiO _{3 is} used as the composite slider material, and Al ₂ O ₃ .TiC is used as the thin film slider material. In addition, as a modification of these in terms of higher density and narrower track, a floating magnetic head having a structure in which a magnetic core is formed by sandwiching a metal magnetic film by using a thin film forming technique between non-magnetic substrates is proposed. Has been done.

[0003]

However, in the above-mentioned conventional structure, the floating magnetic head using CaTiO ₃ or the like as the slider material has a contact start stop (hereinafter referred to as a contact start stop) for the magnetic disk medium as compared with the magnetic ferrite in which the slider material is a monolithic type. C
It cannot be said that the characteristics are abbreviated as SS). Therefore, there is an example of processing (crowning) that makes the air floating surface convex, but when performing crowning, electromagnetic conversion characteristics deteriorate due to variations in processing (variation in crown height). There are cases.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a floating magnetic head capable of preventing deterioration of electromagnetic conversion characteristics.

[0005]

In order to achieve this object, the slider is made of α-Fe ₂ O ₃ .

[0006]

With this structure, the CSS characteristics can be improved without significantly performing crowning.

[0007]

【Example】

(Embodiment 1) FIG. 1A is an external perspective view showing a laminated type floating magnetic head according to an embodiment of the present invention, and FIG.
FIG. 2 is an enlarged view of a portion A of FIG. 1A, that is, a magnetic core portion. In FIGS. 1A and 1B, reference numeral 1 is a slider, and the slider 1 is provided with a pair of levitation rails 2 and 3. The slider 1 is composed of two substrates 1a and 1b made of α-Fe ₂ O ₃ , and a magnetic core 4 is formed between the substrates 1a and 1b. Magnetic core 4
As shown in FIG. 1B, a metallic magnetic layer 4a having a high saturation magnetic flux density and a high magnetic permeability, such as an Fe—Al—Si alloy, an amorphous magnetic alloy, or a Fe—Ni alloy, is formed on the substrate 1b.
And an insulator layer 4b of SiO ₂ , Al ₂ O ₃ or the like are alternately laminated by sputtering to have a thickness of 3 μm and 0.2 to 0.5 μm, respectively. Then, the substrate 1a is attached to the magnetic core 4 obtained by the lamination using the adhesive glass 5. 6 is a magnetic gap.

(Embodiment 2) FIG. 2 is an external perspective view showing a composite type floating magnetic head according to another embodiment of the present invention. In FIG. 2, reference numeral 7 is a slider made of α-Fe ₂ O ₃ , and the slider 7 is provided with levitation rails 9 and 10 parallel to the winding groove 8 on the end surface. Further, a cutout portion 11 intersecting with the winding groove is provided at the end of the levitation rail 10, and a magnetic core 12 made of a magnetic material having a magnetic gap is inserted into the cutout portion 11.
2 is fixed in the notch 11 with a mold glass.

(Embodiment 3) FIG. 3A is an external perspective view showing a thin film type floating magnetic head according to another embodiment of the present invention, and FIG. 3B is a portion B of FIG. 3A. FIG. In FIG. 3A, 13 is a slider made of α-Fe ₂ O ₃ , and the slider 13 has levitation rails 14 parallel to each other.
Are provided respectively. Reference numerals 15 and 16 are thin-film magnetic heads formed at the ends of the levitation rails 14, respectively.
The magnetic heads 15 and 16 are configured as shown in FIG. In FIG. 3B, 17 is a coil layer, and the coil layer 17 is formed between the upper magnetic layer 18 and the lower magnetic layer (not shown).

CSS of the three embodiments configured as described above
Characteristics of conventional CaTiO ₃ and Al ₂ O ₃ · TiC
The description will be made in comparison with a floating magnetic head in which is used as a slider.

FIG. 4 shows a floating magnetic head using α-Fe ₂ O ₃ according to this embodiment as a slider and a conventional CaTiO _3
3 shows a comparison of CSS characteristics with a floating magnetic head using Al ₂ O ₃ .TiC as a slider. FIG. 4 is a conceptual diagram of experiments for comparing characteristics. In FIG. 4, 19 is a magnetic disk, 20 is a spindle motor for rotating the magnetic disk 19, and 21 is a control device for controlling the spindle motor 20. Reference numeral 22 is a slider shown in FIG. 3 (one in which a thin film type magnetic head is not formed). In the experiment, as samples 1, 2, and ₃ , CaTiO ₃ , α-Fe ₂
The slider 22 was made using O ₃ and Al ₂ O ₃ .TiC as constituent materials. The experimental method is as follows: the controller 21 controls the spindle motor 20 to control the magnetic disk 19
Performs rotation as shown in FIG. Then, this rotation pattern is repeated 20,000 times, and then the slider 2
A dynamic friction coefficient of 2 was measured. At this time, the temperature was 25 ° C. and the humidity was 40%.

FIG. 6 is a graph summarizing the results of this experiment. FIG. 6 shows the relationship between the crown height and the coefficient of dynamic friction. The crown height is the length H shown in FIG. That is, the apex of the curved portion and the taper portion 22a which occur when the slider 22 is processed so that the medium facing surface is curved.
It is the difference in height to the boundary of. As can be seen from FIG. 6, in the conventional example, that is, in Samples 1 and 3, the dynamic friction coefficient becomes smaller as the crown height becomes larger. This is well known in the art. In this example, that is, sample 2, the coefficient of dynamic friction is substantially constant regardless of the crown height, and the coefficient of dynamic friction itself is smaller than those of samples 1 and 3. That is, it can be seen that Sample 2 is superior to the conventional one in the CSS characteristics even if it is not subjected to a large crowning.

As described above, as a constituent material of the slider, α-
By using Fe ₂ O ₃ , it is not necessary to largely perform crowning or the like in order to improve the CSS characteristics as in the conventional case, and the CSS characteristics are improved as compared with the conventional case. Similar effects could be obtained in the first and second embodiments.

The fact that it is not necessary to apply a large amount of crowning as in this embodiment also means that the electromagnetic conversion characteristics are not deteriorated. This will be explained below.

As a comparative example, the laminated floating magnetic head shown in FIG. 8 in Example 1 and a slider material, CaTiO.
An output comparison with a stacked magnetic head using ₃ is shown. In Example 1, the crowning amount was set to 10 nm, and in the comparative example, the crowning amount was centered on 60 nm from the result of FIG. Since the flying height increases when crowning is performed, the flexure load value was adjusted to match the average flying height of both. In Example 1, compared with the comparative example, the average value of the output is almost equal, but the variation is smaller. In the comparative example, it is necessary to increase the crown amount, and therefore, the crown amount largely varies, and the electromagnetic conversion characteristics also vary.

As described above, in this embodiment, the slider is set to α
By using -Fe ₂ O ₃ , the CSS characteristics can be improved as compared with the conventional ones without the need for a large crowning, and there is no variation in the electromagnetic conversion characteristics.

Although a slight crowning was applied in the present embodiment, the CSS characteristics superior to those of the prior art were exhibited without any crowning.

[0018]

According to the present invention, the slider is made of α-Fe ₂ O ₃ , so that the CSS is processed without a large crowning.
Since the characteristics can be improved, it is possible to prevent the electromagnetic conversion characteristics from varying.

[Brief description of drawings]

FIG. 1A is an external perspective view showing a laminated floating magnetic head according to an embodiment of the present invention. FIG. 1B is an enlarged view of the same portion.

FIG. 2 is an external perspective view showing a composite type floating magnetic head according to an embodiment of the present invention.

FIG. 3A is an external perspective view showing a floating magnetic head having a thin film magnetic head according to an embodiment of the present invention. FIG. 3B is an enlarged view of the same portion.

FIG. 4 is a conceptual diagram showing an experiment for measuring CSS characteristics.

FIG. 5 is a graph showing the setting of the rotation speed of the magnetic disk.

FIG. 6 is a graph showing the relationship between crown height and coefficient of dynamic friction.

FIG. 7 is a side view of the slider showing the definition of crown height.

FIG. 8 is a graph showing variations in output between Example 1 and Comparative Example.

[Explanation of symbols]

 1 slider 1a substrate 1b substrate 2 levitation rail 3 levitation rail 4 magnetic core 4a metal magnetic layer 4b insulating layer 5 adhesive glass 6 magnetic gap 7 slider 8 winding groove 9 levitation rail 10 levitation rail 11 notch 12 magnetic core 13 slider 14 Levitation rail 15 Magnetic head 16 Magnetic head 17 Coil layer 18 Upper magnetic layer

Claims (1)

[Claims] 1. A floating structure comprising a slider made of a non-magnetic material and having a levitation rail, and a magnetic conversion element provided on the slider, wherein the slider is made of α-Fe ₂ O _3. Type magnetic head.