JPH0668107U - Thin film magnetic head - Google Patents

Abstract

(57) [Summary] [Object] To facilitate manufacturing of a thin-film magnetic head that floats on a magnetic recording medium to perform magnetic recording and reproduction. [Structure] A slider 2 facing the hard disk 3,
A gap portion 9 formed on the air bearing surface 4 of the slider 2 and a pair of a right core 7 and a left core 8 having the gap portion 9 interposed therebetween.
In the thin film magnetic head 1 including a coil pattern 12 formed by forming a thin film in which the right core 7 and the left core 8 are arranged so that they can be excited,
It is formed on the slider back surface 11 which is substantially parallel to the air bearing surface 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thin film magnetic head, and more particularly to a thin film magnetic head that floats on a magnetic recording medium to perform magnetic recording and reproduction.

[0002]

[Prior art]

 Various types of magnetic heads have been proposed for performing magnetic recording and reproduction on a magnetic recording medium, depending on the application. In recent years, a hard disk drive device in which a magnetic head floats above a hard disk to perform magnetic recording / reproducing has been widely used as a storage device for a computer, a word processor, or the like. A thin film magnetic head is well known as a floating magnetic head for a hard disk drive.

FIG. 5 and FIG. 6 are perspective views showing an example of a conventional flying type thin film magnetic head.

FIG. 5 shows an overview of the flying thin-film magnetic head 31. The thin-film magnetic head 31 generally includes a slider 32 and a head forming portion 33. The lower surface of the slider 32 in the figure is an air bearing surface 34 that faces a hard disk (not shown). Grooves 35a and 35b are formed on the air bearing surface 34. The grooves 35a and 35b serve as air passages when the hard disk rotates at high speed.

A magnetic head portion 33 is formed on the right side surface of the slider 32 in the figure. The magnetic head portion 33 is provided with a magnetic head 36a and a magnetic head 36b as shown in detail in FIG.

The magnetic head 36a and the magnetic head 36b have the same shape as shown in FIG. 6, and the magnetic head 36a (36b) is provided with a coil pattern 37 and a pair of lower core 38 and upper core 39. There is. These are formed by a well-known thin film forming process. The coil pattern 37 and the lower core 38 are insulated from each other by the interlayer insulating film 40, and the coil pattern 37 and the upper core 39 are insulated from each other.

A gap portion 41 is formed between the lower core 38 and the upper core 39 by a non-magnetic material. The gap portion 41 is formed on the same plane as the air bearing surface 34 in FIG. Then, by causing a hard disk (not shown) to face the air bearing surface 34 and move it in the arrow Y ₁ -Y ₂ direction, an induced electromotive force corresponding to the recorded magnetic signal of the hard disk is generated in the coil pattern 37.

Further, magnetic recording is performed on the hard disk by moving the hard disk in the direction of the arrow Y ₁ -Y ₂ so as to face the air bearing surface 34 and supplying a recording current to the coil pattern 37. Therefore, the dimension of the portion sandwiched between the lower core 38 and the upper core 39 of the gap portion 41 becomes the track width.

[0009]

[Issues to be solved by the device]

 However, according to the conventional thin film magnetic head described above, the magnetic head portion is formed on the side surface of the slider in a limited space. For this reason, the plane dimension of the coil pattern is limited and dimensional accuracy is required, and in order to increase the number of windings for higher output, it was necessary to stack the coil patterns. Therefore, there is a problem that manufacture is difficult.

In view of the above points, the present invention aims to provide a thin film magnetic head that is easy to manufacture.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a slider facing a magnetic recording medium, a gap portion formed on an air bearing surface of the slider, a pair of core materials formed by interposing the gap portion, and a core material are provided. In a thin-film magnetic head having a coil pattern formed as a thin film that is arranged so that it can be excited, the coil pattern is formed on the slider back surface that is substantially parallel to the air bearing surface of the slider.

[0012]

[Action]

 According to the above means, since the slider back surface, which is substantially parallel to the air bearing surface of the slider, can have a larger area than the slider side surface, the coil pattern is formed as compared with the case where the coil pattern is formed on the slider side surface. It acts so that the dimensional constraints on the operation are relaxed.

[0013]

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a thin film magnetic head 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the thin-film magnetic head 1 as seen through from the A ₁ direction. The thin film magnetic head 1 shown in both figures is mounted in, for example, a hard disk drive.

In both figures, reference numeral 2 denotes a slider, which is made of, for example, a ceramic material containing potassium titanate (KTiO ₃ ) or barium titanate (BaTiO ₃ ) as a main raw material.

On the air bearing surface 4 of the slider 2 facing the hard disk 3, grooves 5 a and 5 b are formed with the moving direction of the hard disk 3 as the longitudinal direction. The grooves 5a and 5b serve as air passages when the hard disk 3 rotates at a high speed, and are not limited to two.

When the hard disk 3 is rotationally driven by a spindle motor not shown in the figure, the slider 2 is moved by a predetermined distance according to its weight, the area of the air bearing surface 4 facing the disk surface, and the rotational speed of the hard disk 3. It floats from the disc surface and recording or playback is performed in the floating state.

A magnetic head 6 is formed on the right side of the slider 2 in FIG. 1 and the lower right side of FIG. The magnetic head 6 has a pair of right and left cores 7 and 8 formed by butting in a “V” shape. A non-magnetic material such as glass is interposed in the abutting portion between the right core 7 and the left core 8, and a gap portion 9 having a predetermined size is formed on the air bearing surface 4 of the slider 2.

Further, a glass layer 10 having an inverted triangular cross section is formed on the upper portions of the right core 7 and the left core 8. Further, the slider back surface 11, which is the upper surface in FIG. 1, is substantially parallel to the air bearing surface 4, and a coil pattern 12 of one layer is formed on the upper part of the right core 7 and the left core 8 of the slider back surface 11 by a known thin film forming process. It is formed by.

As shown in FIG. 2, in the coil pattern 12, a coil 14 having an external connection terminal 13 at one end and a coil 16 having an external connection terminal 15 at one end are connected to terminals 17 a and 17 b. Are connected in series with each other. Further, the winding directions of the both coils 14 and 16 are the same direction, which is a well-known balanced winding.

An upper core 19 is formed between the winding center position of the coil 14 and the winding center position of the coil 16 with an inter-layer insulating film 18 interposed. Both sides of the upper core 19 are joined to the upper ends of the right core 7 and the left core 8, respectively. As a result, the right core 7, the left core 8 and the upper core 19 form a closed magnetic circuit. In addition, 20 is an upper protective layer.

Therefore, by supplying a recording current to the coil pattern 12, a magnetic flux change occurs according to the recording current in this closed magnetic circuit, and magnetic recording is performed at a position near the gap 9 of the hard disk 3.

By rotating the recorded hard disk 3 so as to face the slider 2, the recorded magnetic signal is detected by the gap 9 and the closed magnetic circuit is excited. Therefore, an induced electromotive force corresponding to the recorded magnetic signal is generated between the external connection terminal 13 and the external connection terminal 15 of the coil pattern 12.

According to the present embodiment, since the coil pattern 12 is formed as a thin film on the slider back surface 11 which is sufficiently larger than the side surface of the slider 2, the restriction of the plane size in manufacturing is much less strict than the conventional one. Therefore, the dimensional accuracy is less required than the conventional one. Further, since a coil pattern having a large number of windings can be formed in a single layer without being laminated, the manufacturing is easy and the manufacturing process can be shortened, and the high output can be easily achieved.

Further, since it is easy to increase the size of the core, a high saturation magnetic flux density can be obtained. Further, since the coil pattern 12 is formed by the balance winding of the two coils 14 and 16, the S / N ratio of the reproduced signal is less likely to be deteriorated by external noise.

Next, FIG. 3 is a sectional view showing a thin film magnetic head 21 according to another embodiment of the present invention. FIG. 4 is a plan view showing the thin film magnetic head 21 as seen through from the A ₂ direction. In both figures, the same components as those in FIG. 1 and FIG.

The thin film magnetic heads 21 shown in both figures are different from the above-described thin film magnetic head 1 in the connection of the coil pattern and the configuration of the closed magnetic circuit, and are similarly mounted in the hard disk drive device. .

As shown in FIG. 3, the coil pattern 22 composed of a thin film is composed of a coil 25 formed between an external connection terminal 23 and an external connection terminal 24, an external connection terminal 23 and an external connection terminal. It is a so-called bifilar winding composed of a coil 27 formed between the coil 26 and the coil 26.

Further, as shown in FIG. 4, a right core 28 substantially perpendicular to the air bearing surface 4 of the slider 2, an upper core 29 joined to the upper end of the right core 28 and formed on the slider back surface 11, and its upper end A closed magnetic circuit is formed by the diagonally formed left core 30 which is joined to the core 29 and has the lower end thereof and the lower end of the right core 28 with the gap portion 9 interposed therebetween.

Also in this embodiment, the same effect as the above embodiment can be obtained. In each of the above-described embodiments, the coil pattern is composed of two coils, but it may be composed of one coil or three or more coils.

[0030]

[Effect of device]

 As described above, according to the present invention, the back surface of the slider, which is substantially parallel to the air bearing surface of the slider, can have a larger area than the side surface of the slider, so that the coil pattern is formed as compared with the case where the coil pattern is formed on the side surface of the slider. Since the above dimensional restrictions are relaxed and dimensional accuracy is no longer required, manufacturing can be facilitated, and the process can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view showing a thin film magnetic head according to an embodiment of the present invention.

FIG. 2 is a plan view showing the thin film magnetic head of FIG.

FIG. 3 is a sectional view showing a thin film magnetic head according to another embodiment of the present invention.

FIG. 4 is a plan view showing the thin film magnetic head of FIG.

FIG. 5 is a perspective view showing an example of a conventional thin film magnetic head.

6 is a perspective view showing a main part of the thin film magnetic head of FIG.

[Explanation of symbols]

 1, 21 thin film magnetic head 2 slider 3 hard disk 4 air bearing surface 7,28 right core 8,30 left core 9 gap part 11 slider back surface 12,22 coil pattern 19,29 upper core

Claims (1)

[Scope of utility model registration request] 1. A slider facing a magnetic recording medium, a gap portion formed on the air bearing surface of the slider, a pair of core materials formed by interposing the gap portion, and the core material arranged so as to be excitable. A thin-film magnetic head comprising a coil pattern formed by a thin film, the thin-film magnetic head having the coil pattern formed on a slider back surface substantially parallel to an air bearing surface of the slider.