JPS60177409A - Magnetic head for vertical recording and reproducing - Google Patents

Abstract

PURPOSE:To reduce the relative speed of the head and to attain the satisfactory reproduction even with multi-channels by providing a cut part to a main magnetic pole and arranging an MR element having a magneto-sensitive part which is magnetically connected to the main magnetic pole. CONSTITUTION:A main magnetic pole 2 or recording/reproducing is divided into two parts by magnetic poles 2b and 2c together with a cut part 2d formed partially. The part 2d contains an MR (magneto-resistance effect) element 10 having a magnetic-sensitive part connected magentically to poles 2b and 2c. Then an energizing winding 4 and a common conductor 4b are formed by etching. In a reproduction mode the reproduced magnetic flux flowed from the tip 2a of the pole 2 is sent back to a recording medium after passing through the element 10, the main magnetic pole 2c and then magnetic matters 6 and 9. Thus the head relative speed is low since the element 10 has a magnetic flux response type structure. This ensures the satisfactory reproduction even with many channels and a narrow track.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a perpendicular recording/reproducing magnetic head suitable for performing multi-channel perpendicular magnetic recording on a magnetic recording medium such as a flexible disk and for reproducing the same. It is.

BACKGROUND TECHNOLOGY First of all, as a perpendicular recording/reproducing magnetic head for performing so-called perpendicular magnetic recording in multiple channels on a magnetic recording medium such as a flexible disk, FIG. 1, FIG. 2, FIG. 3, and FIG. The following are proposed.

In this example, as shown in FIG. 1, a predetermined number of main magnetic poles (21, (2),...
・.

(2) is arranged. In addition, the magnetic recording medium (3) on which, for example, digital signals are recorded by the perpendicular magnetic field from the main magnetic pole (2) has a perpendicular recording layer (3) as shown in FIG.
This is a two-layered medium for perpendicular magnetic recording in which a) and a high magnetic permeability layer (3b) are provided on a support (3C). The perpendicular recording/reproducing magnetic field is w main magnetic pole (2) and magnetic recording medium (3)
It has an open magnetic path configuration. Next, this example will be described in detail with reference to FIGS. 2 and 3.
a tip (2a) of which extends to the magnetic recording medium sliding surface S;
The magnetic recording medium (2) is configured to pass magnetic flux in a perpendicular direction to the magnetic recording medium (2). Here, in order to increase the magnetic flux density, the tip (
The cross section of 2a) is formed small, and the vertical d
In order to reduce the magnetic resistance of the magnetic path of the a-flux and allow the magnetic flux to pass through it better than the other end, the cross-sectional area of the part near the thin film coil as the excitation winding (4) is formed to be large. In addition, inside the thin film coil (4), the thin film coil (
4) is provided with a connecting magnetic material portion (6) made of, for example, a magnetic thin film, through which the magnetic flux excited by the excitation current flowing through the connecting magnetic material portion (6) passes. The non-magnetic material portion (7) and (
8) and a magnetic material portion (9) made of magnetic ferrite to form a return path for the magnetic flux 7. A composite substrate is joined. With such a configuration, it is possible to easily handle multiple channels, and the number of channels shown in FIG. 4 can be reduced.

In the proposed example configured in this way, the excitation winding (4)
The magnetic flux excited by the current flowing through the connecting magnetic body (6) and passing through the main magnetic pole (2) advances from the main magnetic pole tip (2a) in a direction perpendicular to the magnetic recording medium (3).
a) is magnetized by inversion corresponding to the inversion of the digital signal, and recording signals are recorded with high density.

In addition, during reproduction, the once magnetized perpendicular recording layer (3a)
expands the magnetic flux, and due to changes in the magnetic flux passing through the main magnetic flux (2) and the connecting magnetic body (6), a reproduction current flows to the excitation winding a (4), a reproduction signal is detected, and magnetic reproduction can be performed.

However, in order to create a multi-channel magnetic head with a narrow track width, a thin-film head structure is necessary, but when forming a winding using the process of forming a thin-film coil, it is difficult to make more than a few tens of turns. The proposed example had a problem.

In addition, it has a narrow track width and multiple channels, and improves recording and reproducing efficiency.

In order to shorten the magnetic path (this reduces the winding width, but from this point of view as well, increasing the number of windings has a limit on K. In devices with low relative speeds, the reproduction voltage becomes very small, and there is a problem in that reproduction in a type equipped with a membrane conductor winding is not practical.

Purpose of the Invention In view of the above, the present invention provides a magnetic head for perpendicular recording and reproducing, which has a low relative speed between the magnetic recording medium and the magnetic head for perpendicular recording and reproducing, and is capable of obtaining a good reproducing voltage even with a narrow track and multiple channels. We aim to provide the following.

Summary of the Invention The magnetic head for perpendicular recording and reproducing of the present invention includes a substrate formed of a non-magnetic material, a main magnetic pole whose one end extends to the sliding surface of a magnetic recording medium and has a cutout, and the other end of the main magnetic pole. A recording winding formed so that the magnetic path is on the inside, a magnetoresistive element having a magnetic sensing part in the cutout part that is magnetically connected to the main magnetic pole, and a non-magnetic material on the sliding surface side of the magnetic recording medium. It has a magnetic material part that penetrates the inside of the recording winding and is magnetically connected to the main pole, so that the relative speed between the magnetic recording medium and the magnetic head is small and a good reproduction voltage can be obtained even with narrow tracks and multiple channels. This is what I did.

EXAMPLE Hereinafter, an example of the perpendicular recording/reproducing magnetic head of the present invention will be described with reference to FIGS. 5 and 6.

A main magnetic pole for recording and reproduction is shown which has a cutout (2d) in the main pole (2).
A magnetoresistive element (hereinafter referred to as MR element) (lot) having a magneto-sensitive part so as to be magnetically connected to (2C) is arranged.Here, the width WR and thickness D of the MR element are For example, as shown in FIG. 5B, the width WR, which is a major determining factor, is several μm or less, preferably about 5 to 20 μm, and the thickness D is often 200X to 500X.The width that overlaps with the main magnetic pole (2) The thickness Tm of the sliding surface of the main magnetic pole]2) determines the resolution of reproduction, so it is selected to be approximately 4 or less of the shortest wavelength used, and is usually 0.05 to 1 μm, often 0. It is 1 to 0.5 μm. To increase the recording and reproducing sensitivity, the main pole is made thicker except for the tip. Its thickness Ta
is preferably 1 μm or more. If it is too thick, it will take a long time to manufacture, so for practical purposes it should be 10 to 20 μm or less. The length up to the point where it becomes thicker, that is, the main pole tip length Lm, is better to be shorter from the point of view of sensitivity, but since it determines the life of the magnetic head for perpendicular recording/reproduction, it is not wise to make it too short.
~10μm is appropriate.1. [ru. In addition, the MR element αO
) should be as close to the tip as possible in order to increase the reproduction sensitivity, so it should be made as small as possible so that Lm<LD. In this way, the main magnetic pole (2) is made thinner by adding steps at the tip end position than the MR element, but the part ahead of the MR element 00) can have a constant thickness Tm, and the rear part can be made thicker. This is advantageous in terms of reproduction because the MR element (101) can be brought closer to the tip, but when recording, it is advantageous in terms of sensitivity if the tip (2a) is also partially thickened. It is best to position (4) as close to the sliding surface S as possible in order to increase efficiency, but if it is on the sliding surface S, it will have a negative effect on recording, so the MR element 00)
The same position is appropriate.

Further, in FIG. 6, (Ill indicates a recording signal input terminal, the signal from this recording signal input terminal (Ill) is supplied to the recording amplifier (12+), and the output terminal of this recording amplifier (121) is connected to the selector switch (131). One fixed contact (13a
). In addition, direct current is connected to terminal VDC to MR element 0.
The second fixed contact (13b
). Also, the movable contact (13c) of the changeover switch (131) is connected to one end of the excitation coil (4), and the other end of the excitation winding f41 is grounded.When recording, the movable contact (13c) of the changeover switch (α&) is connected to one end of the excitation winding (4). 13a) and the first fixed contact (13a) of the changeover switch (131) are connected, a recording current is passed through the excitation winding (4), and a perpendicular magnetic flux is excited in the main magnetic pole (2).

One end of the MR element (101) is connected to the non-inverting input terminal of the reproduction amplifier (1, 41), and the other end of the MR element (101 is grounded. Also, the DC power supply VDC is connected to a variable resistor for adjusting the bias current of the MR element. The power amplifier (141
is supplied to the non-inverting input terminal of Further, a DC power supply VDC is connected to one end of a variable resistor R3 for zero balance adjustment, and the other end of this variable resistor R3 is grounded. Also, connect the movable element of the variable resistor R2 and the inverting input terminal of the reproducing amplifier (1410) so that the reproduced signal is obtained at the output terminal (151) of the reproducing amplifier Q41.Here, when obtaining the reproduced signal, The movable contact (13c) of the changeover switch (131) is connected to the second fixed contact (13b), and the excitation winding (4) is set to M during playback.
It is used as a bias winding to apply a bias magnetic field to the R element (101). In this way, there is no need to provide a separate MR element bias circuit. Even if a separate bias line is prepared commonly for the main magnetic pole of each channel, Good, but the magnetic head for perpendicular recording and playback becomes complicated.In addition, if the magnetic head is magnetized during playback and has a negative effect on playback, the amplitude of the recording current value after recording ends may gradually attenuate. The core of the magnetic path is demagnetized by passing an AC current through the excitation winding.Other parts are constructed in the same manner as the conventional magnetic head for perpendicular recording/reproduction.

Next, FIGS. 7 to 17 show examples of the manufacturing process of this embodiment.
This will be explained with reference to the figures. First, as shown in FIG. 7, an MR element 01 is patterned on a mirror-polished nonmagnetic substrate. The MR element QOI is Ni-Fe or N
The i-Co magnetic alloy film (10a) has a thickness of 100X to 1
It is formed by attaching an oooX (mostly 200X to 500X) by vapor deposition, sputtering, ion plating, etc. After this pattern Jung, the MRfE element (101) is formed in a magnetic field or with the substrate tilted so that the magnetic film (10a) has an axis of easy magnetization in the direction in which the bias current flows in the magnetic sensitive part (101), that is, in the track width direction of the head. In Fig. 7, the MR elements αα are set in sets of two, and the terminals on one side are shared, and as will be described later, they are drawn out through a common conductor, in order to reduce the number of terminals. In the example, everything is made of a magnetic thin film, but the parts other than the magnetically sensitive part are made of a good conductor film such as copper. It is advantageous to reduce the electrical resistance of , as it can reduce thermal noise.
As shown in FIG. 8, an insulating film with a thickness of 0.1 to 0.5 μm is applied. As long as the insulation is sufficient, the thinner the film, the better. This is to reduce the magnetic resistance between the magnetic main pole film and the magnetic main pole film attached thereon. Next, as the main magnetic pole (2), permalloy, sendust,
A magnetic amorphous film of Co--Zr, Co--Nb--Zr, etc. is applied and patterned by photoetching (FIG. 9). The main magnetic pole (
2) is divided as shown in the figure to form a cutout part and the MR element 0
0) so that it slightly overlaps. Further, as shown in FIG. 10, the tip portion (2a) of the main pole (2b) is formed thin in order to improve reproduction resolution, and the rear portion of the main magnetic pole (2b) is formed thick in order to reduce magnetic resistance. Next, the insulating film (5
) is planarized, and then an excitation winding (4) is formed by patterning using a conductive thin film of copper, aluminum, etc. (FIG. 11).

Next, an insulating film is attached (Fig. 12), and the excitation winding IvIIf4
A through hole for connection is made by etching in the common conductor terminal portion of the MR element 1 and MR element 00), and a conductor film is attached.The common conductor (4b) is patterned by photoetching as shown in FIG. This common conductor (4b) is a common ground terminal for the excitation winding (4) and the reproduction MR element 00), reducing the number of required terminals. Although the excitation winding (4) is formed of two turns per layer in this example, it can also be formed of two or more layers. Next, after attaching the insulating film, a hole is made in the center of the excitation winding (41) for connection between the main pole film (7) and the 7-elite core that is the return part, and a magnetic film (41) for connection is made. 6a) is attached and then flattened.Next, in order to make each terminal part, holes are made in the insulating film in a predetermined range of the MR element αα, the excitation winding (41, and the common conductor), and the conductor film is patterned. Then, each terminal is formed (FIG. 14).The outline of the board thus far produced is shown in FIG. 15.- Cut in rows using cutting TfIIC1.

Next, a composite substrate (7a
) are joined together as shown in FIG. 16, and the sliding surface S is cylindrically polished and then cut into each perpendicular recording magnetic head to obtain the perpendicular recording/reproducing magnetic head of this example as shown in FIG. 17.

In this embodiment, magnetic conduction @! near the tip of the main magnetic pole (2) occurs. (Since the 2+ is divided and the reproducing MR element is placed in the cut-out part (2d), the magnetic flux flowing from the main magnetic pole tip (2a) during coexistence is Ml().

The connection magnetic body (101) passes through the element (2C) and connects the rear main pole (2C). At this time, the excitation winding (4
) is supplied with an appropriate DC current to apply a bias magnetic field to the MR element α0), and since the MR element (10) is of a magnetic flux responsive type, the relative speed between the magnetic recording medium (3) and the perpendicular recording/reproducing magnetic head is A good reproduction voltage can be obtained regardless of. Also, during recording, the main magnetic pole (2) has a cutout (2d), which slightly reduces the recording sensitivity, but since the magnetic path is originally short and has high efficiency, the cutout (2d) reduces the recording sensitivity. are not particularly ordered.

As described above, according to this embodiment, since the reproduction voltage can be obtained with extremely high sensitivity by the MR element αω, the relative speed between the magnetic recording medium (3) and the perpendicular recording/reproducing magnetic head is small, even in the case of narrow tracks and multiple channels. There is an advantage that a good reproduction voltage can be obtained. In addition, since the main magnetic pole (2) serves as a magnetic conduction path for the magnetic flux flowing to the MR element (00), the demagnetizing field at the end of the MR element (1 (l) becomes smaller, and the magnetic flux density within the MR element QOI decreases. There are benefits that approach more uniformity.

Further, FIG. 18 shows another example improved to improve efficiency. First, in order to increase the recording and reproducing efficiency, an MR element (10
Either a magnetic film is formed on the lower part of the MR element (11) and a pillow material is attached, or the lower main magnetic pole (2c) = ffA = d+ is inserted from the main magnetic pole (2b) at the tip of the MR element (1, (11) to increase the recording sensitivity. improve.

Furthermore, the connecting magnetic body (6) has a shape in which a magnetic film is also formed around the connecting hole to increase the area facing the ferrite and improve the return bus effect. It is easy to understand that this example also provides the same effects as those of the above embodiment.

Further, as shown in FIG. 19, the main magnetic pole (2) can be formed before forming the MR element (101), and the MR element (101) can be formed.
There is the benefit of increased efficiency in applying a bias magnetic field to the element QOI.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

Effects of the Invention The magnetic head for perpendicular recording and reproducing of the present invention comprises a substrate made of a non-magnetic material, a main pole whose one end extends to the sliding surface of the magnetic recording medium and has a cutout in the middle, and the other end of the main pole. The recording winding is formed so that the magnetic path is on the inside, and the MR element has a magnetically sensitive part that is magnetically connected to the main pole in the cutout part, so it is magnetic flux responsive and extremely sensitive. A certain MR element allows a reproduction voltage to be obtained regardless of the relative speed between the magnetic recording medium and the magnetic head. "'-゛-゛-゛ Since the reproduced signal is detected by a very highly sensitive MR element, it is a magnetic flux response type, so even if the relative speed between the magnetic recording medium and the magnetic head becomes small, the single-pole magnetic head can still output the signal. There is an advantage that a desired good reproduction signal can be obtained as well as recording.
The structure of the R element itself is simple, and there is an advantage that a multi-channel magnetic head can be manufactured easily.

[Brief explanation of drawings]

1, 2, 3, and 4 are diagrams showing examples of conventional magnetic heads for perpendicular recording and reproduction, and FIG. 5 shows essential parts of an embodiment of the magnetic head for perpendicular recording of the present invention. Diagram showing examples, No. 6
The diagrams are the connection diagram of the example in Figure 5, Figures 7, 8, 9, and 1.
Figure 0, Figure 11, Figure 12, Figure 13, Figure 14, Figure 1
5, 16, and 17 are diagrams showing an example of the manufacturing process of the example shown in FIG. 5, FIG. 18 is a sectional view showing an example of the main part of another embodiment of the present invention, and FIG. 19 FIG. 3 is a sectional view showing another embodiment of the present invention. (1) is a non-magnetic substrate, (2) is a main magnetic pole, (2d) is a cutout part, (41 is a recording winding, 00) is a magnetoresistive element, (
3) is a magnetic recording medium, and (9) is a magnetic material part. Figure 1b Figure 18 4d Figure 19 4d Pass

Claims (1)

[Claims] A substrate formed of a non-magnetic material, a main magnetic pole whose one end extends to the magnetic recording medium sliding surface and has a cutout, and a recording winding formed so that the magnetic path on the other end side of the main magnetic pole is on the inside. a magnetoresistive element having a magnetically sensitive part in the cutout part to be magnetically connected to the main magnetic pole; a magnetoresistive element that penetrates through the nonmagnetic material part on the sliding surface side of the magnetic recording medium and the inside of the recording winding; 1. A magnetic head for perpendicular recording/reproduction, comprising: a composite core having a magnetic material portion magnetically connected to the main magnetic pole;