JPS5853018A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To increase a reproduced output, by forming a main magnetic pole with the 1st high permeability layer of strip shape clipped with holders and the 2nd high permeability layer almost horizontally extended to the recording medium surface. CONSTITUTION:A main magnetic pole 22 and an auxiliary magnetic pole 23 are arranged so that a magnetic recording medium 19 can be clipped, and the auxiliary magnetic pole 23 is formed by winding a coil 21 around a ferromagnetic substance core 20. The main magnetic pole 22 thus used is formed by providing the 2nd high permeability layer 17 which holds the 1st high permeability layer 14 of strip shape with nonmagnetic substance holders 11 and 11', contacts one end of the layer 14 at the side opposite to the medium 19 and is almost orthogonal to the layer 14, and a ferromagnetic substance 18 is arranged in contact with the layer 17. Thus, high-density recording can be done and a high reproducing output can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head used in a perpendicular recording method in which magnetic recording is performed by injecting magnetic flux from a magnetic pole perpendicular to the surface of a magnetic recording medium, and a method for manufacturing the same.

As shown in Figure 1, a conventional magnetic head used for perpendicular recording has a main magnetic pole 6 in which a ferromagnetic thin film layer 2 such as permalloy is sandwiched between non-magnetic materials 1 such as ceramics or glass.
and an auxiliary magnetic pole 7 in which an excitation coil 5 is wound around a ferromagnetic core 4, and both the main magnetic pole 6 and the auxiliary magnetic pole 7 are arranged so as to face each other with the magnetic recording medium 3 in between. The magnetic field generated by the auxiliary magnetic pole 7 acts on the main magnetic pole 60 to generate a strong and sharply distributed perpendicular magnetic field at the portion where it contacts the medium 3, thereby magnetizing the medium 3 in the perpendicular direction. This head has drawbacks in that it cannot provide a sufficient reproduction output and cannot provide a sufficient S/N ratio, so it cannot output reliably for signal processing in digital equipment and the like. Generally, in an electromagnetic induction type magnetic head, the problem is how to efficiently extract a large amount of minute leakage magnetic flux from a minute area where a recording signal is written and focus it in a coil. More magnetic flux passing through the coil means an increase in the output signal, and a larger output has the advantage of reducing decision errors for the signal processing circuit.

The present invention aims to solve the problem of increasing the error rate due to the small output by increasing the output.One embodiment of the present invention will be described below with reference to the drawings.

Since the present invention is characterized by the structure of the main pole and its manufacturing method, this will be explained in detail. First, the manufacturing process of No. 22 is shown in detail.
For example, 80% Ni-Fe perm on 1 or 55%
Film thickness of Ni-30%Fe-16%CO alloy, etc. 1.0μm
A first high magnetic permeability layer 12 is formed by sputtering or vapor deposition (FIG. 2a), a mask is formed thereon with a photosensitive resin 13 (FIG. 2b), and the high permeability magnetic layer 12 is etched. (Figure 2C). 14 shows the first high magnetic permeability layer after etching. FIG. 3a shows this state in a perspective view. Next, another non-magnetic holding material 11 is pasted with an adhesive 16 such as epoxy (FIG. 3b).

Next, as shown in FIG. 3C, the surface 1 is polished by mechanical polishing.
Polish the surface so that the curvature of 6 is the appropriate amount. Next, on the bottom of the holding material 11 shown in FIG. 3C, a second high magnetic permeability layer 17 of permalloy or the like is formed to a thickness of several μm using sputtering or vapor deposition.

Next, as shown in FIG. 4, a ferromagnetic material 18 such as ferrite having high magnetic permeability is applied to the 20th high magnetic permeability layer 17 formed at the bottom of the non-magnetic holding material 11 and 11' using epoxy or the like. Connect with adhesive.

The main pole of one embodiment of the present invention is formed by the manufacturing method described above.

In this manufacturing method, the magnetic resistance of the connecting portion between the second high magnetic permeability layer 17 and the first high magnetic permeability layer 14 can be reduced. This is because the second high permeability layer 1
7 by sputtering or vapor deposition, even if one end surface of the first high magnetic permeability layer 14 is not on the same plane as the bottom of the substrates 11 and 11' and is slightly inside, the sputtering or vapor deposition When using the method, the second high magnetic permeability layer 17 and the first high magnetic permeability layer 14 can be completely connected because it penetrates into the layer, and the magnetic resistance of the connection part can be reduced. There is.

FIG. 5 shows the configuration of a magnetic recording device of the present invention using the main magnetic pole shown in FIG. 4.

A main magnetic pole 22 and an auxiliary magnetic pole 2 sandwich the magnetic recording medium 19.
3 is provided, and the auxiliary magnetic pole 23 is a ferromagnetic core 20
The main pole 22 has a first high magnetic permeability layer 14 held by non-magnetic holding materials 11 and 11', and a first high permeability layer 9 on the side opposite to the recording medium. It has a second high magnetic permeability layer 17 disposed in contact with one end of the magnetic permeability layer 14 and substantially perpendicular to the first high magnetic permeability layer 14, and further in contact with the second high magnetic permeability layer 17. A ferromagnetic material 18 is provided. When a signal recorded in the configuration shown in FIG. 6 was reproduced using this main pole 22, an output as shown in FIG. 6 was obtained. That is, when the reproduction output is plotted using the height 6 μm measured from the bottom of the non-magnetic holding material 11 of the high magnetic permeability layer 14 as the horizontal axis, it is observed that the output increases significantly as d becomes smaller, and d= At 100 μm, the output increased nearly four times.The level indicated by the broken line in the figure shows the reproduction output when using the conventional magnetic head shown in Fig. 1. It can be seen that the output increases significantly when used.The reason for this is thought to be that by configuring the main pole as in the present invention, the demagnetization rate of the tip surface of the auxiliary pole is effectively reduced.

In this example, the thickness of the high magnetic permeability layer 14 is 0.7-1.7 μm.
,) When the thickness in the rack direction was set to 1M%d to approximately 100 μm for recording and reproduction, the recording density increased to 30 KBPI or more, and the output became 2 mV, which was a significant improvement from 87N. It has also been confirmed that the bit error rate is 10 or less, which is within the practical range. Note that in order to increase the recording density, if the thickness of the high magnetic permeability layer 14 is further reduced,
Although there is a slight decrease in playback output, the recording density has been increased to 50%.
It can be made higher than KBPI. According to this embodiment, the reproduction output can be increased by more than four times compared to the conventional method, and the bit error rate can thereby be improved by 104 times. Furthermore, since it can be formed by conventional sputtering or vapor deposition methods, it has the advantage that it can be easily introduced into the manufacturing process even at the stage of mass production.

In the manufacturing method of the present invention, the holding material 1 shown in FIG.
A second high magnetic permeability layer 17 is formed on the bottom of the first high magnetic permeability layer 17 by the suction method, and is connected to the first high magnetic permeability layer 14 to lower the magnetic resistance of the connecting portion. However, when a plate-shaped high magnetic permeability material is connected to the bottom of the substrate with epoxy as the second high magnetic permeability layer 17, although the magnetic resistance of the connection increases to some extent,
The reproduction output can be increased compared to conventional magnetic heads. This case is also considered to be due to the same effect as described above.

A second embodiment of the invention is shown in FIG. In the first embodiment, as shown in FIG. 6, a ferromagnetic material 18 such as ferrite is used.
is connected to the high magnetic permeability layer 18 at the bottom of the holding material 11 with epoxy to form the main magnetic pole 22. However, as shown in FIG. 7, even in the configuration in which the ferromagnetic material 18 is removed from the first embodiment, the re-actual output as shown in the first embodiment cannot be obtained. It was found that an output several times higher than that of the perpendicular magnetic recording head can be obtained during reproduction.

The configuration shown in FIG. 7 has the advantage that the component of the ferromagnetic material 18 is not required and the manufacturing process is also shortened, so that the cost of magnetism can be reduced.

Although the present invention has been described using an auxiliary pole excitation type magnetic head as an example, the present invention is not limited to this.
It goes without saying that the same effects as described above can be obtained using the main magnetic pole of the main magnetic pole excitation type.

As described above, the present invention comprises sandwiching both sides of a first high magnetic permeability layer in the form of a rectangle provided in a direction substantially perpendicular to a recording medium with non-magnetic holding materials, and recording data on the first high magnetic permeability layer. It has a main magnetic pole with a second high magnetic permeability layer that is in contact with the end surface on the opposite side of the medium and extends in a direction almost parallel to the recording medium, allowing for high reproduction output while still having the advantage of high-density recording. It has the advantage of being very simple in structure and extremely effective in practice.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a conventional magnetic head for perpendicular magnetic recording, FIG. 2 a % C, FIG. 3 a % d, and FIG. FIG. 6 is a front view of a magnetic head in an embodiment of the present invention;
This figure is a diagram showing reproduction output when using the magnetic head of the present invention, and FIG. 7 is a front view showing another embodiment of the present invention. 22...Main magnetic pole, 11...Nonmagnetic holding material, 14...High magnetic permeability layer, 17...
・High magnetic permeability material, 18...Ferromagnetic material, 19...
...magnetic recording medium, 2o...ferromagnetic core,
21...Excitation coil, 23...Auxiliary magnetic pole. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 (-1 and -) Figure 2 Figure 2 Figure 3 Figure 4 #! Figure 5 Figure 6 d (yto'dari 17 Figure 2ρ

Claims (1)

[Scope of Claims] (1) A first high magnetic permeability layer having a rectangular shape having a main magnetic pole that magnetizes a magnetic layer of a magnetic recording medium in the perpendicular direction, the main magnetic pole being sandwiched between holding materials; end surface 1 of the first high magnetic permeability layer;
A magnetic head characterized by comprising a second high magnetic permeability layer that is in contact with and extends substantially horizontally to a surface of a recording medium. @) The magnetic head according to claim 1, wherein the first high magnetic permeability layer has a thickness of 1.7 μm or less. (3) A magnetic head according to claim 1 or 2, characterized in that a ferromagnetic material is provided in contact with the second high magnetic permeability layer. (4) The manufacturing process of the main pole includes at least the step of sandwiching both sides of a strip-shaped high magnetic permeability layer with a non-magnetic holding material, and the step of forming another high magnetic permeability layer on the bottom of the holding material. A method for manufacturing a magnetic head characterized by: @) The method for manufacturing a magnetic head according to claim 4, characterized in that the other high magnetic permeability layer is formed by a sputtering method.