JPH01201810A - Magnetic head - Google Patents

Abstract

PURPOSE:To perform magnetic recording and reproduction with high density by forming the input/output part of a magnetic line of force on a head main body between the confronting planes of a superconducting member. CONSTITUTION:An insulator 24 consisting of Al2O3, etc., is provided on the endface of a slider 22 consisting of Al2O3-TiC, etc., intergally. In the insulator 24, coils 261 and 262 consisting of the superconducting member and arranged so as to be confronted with each other by being bent in U-shaped are embedded in a state where whose U-shape end faces are exposed on a surface. The conductive part 28 of the superconducting member is extended to the superconducting coil 26, respectively, and terminals 301 and 302 of Au and Al, etc., are connected to the end part, and it is faced from the side plane of the insulator 24. Also, as a superconducting material which constitutes the coils 261 and 262, oxide of Y-Ba-Cu, etc., is used, and the superconducting material in which Y, Ba and Cu are mixed and sintered in a ratio of 1:2:3 is used as a film raw material, and it is used so as to generate a superconducting phenomenon by cooling the periphery of the a magnetic head including the coils 261 and 262 by a coolant such as liquid He or liquid N, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head capable of high-density recording and high resolution.

[Conventional technology]

Conventional magnetic heads mainly use magnetic field modulation heads, and magnetic recording heads magnetize the magnetic recording medium according to the leakage magnetic flux emitted from the gap between the cores, and leave this in the record as residual magnetization. . In addition, as a reproduction head, when the residual magnetization on the magnetic recording medium moves in contact with the head gap, it goes around the core and interlinks with the coil, reproducing the signal by electromagnetic induction. .

This type of magnetic head is constructed as shown in FIGS. 4-6. That is, in a hard disk magnetic head 1 (FIG. 4) using a thin film head, a pair of core ends 4, which are magnetized by a magnetic field generated by a film coil 3 whose end face of a slider 2 is coated with an insulator, are connected to a magnetic recording medium. (not shown), and the leakage magnetic flux generated between the core ends 4 acts on the magnetic recording medium to record, or conversely, the leakage magnetic flux on the magnetic recording medium side is captured and reproduced. It looks like this. In addition, magnetic helad 5 for floppy disks (
In FIG. 5), a recording/reproducing head core 6 is exposed in a state facing the magnetic recording medium with a head gap 7 interposed therebetween, and leakage magnetic flux between the head gap 7 due to a coil 8 attached to the core 6 is prevented. It is made to act on a magnetic recording medium.

Head cores 9 for erasing are opposed to both sides of the magnetic head 5 for the floppy disk with a gap 1o interposed therebetween, and a magnetic field is similarly generated by a coil 11 to erase blurring at both ends of the track. Furthermore, the magnetic head 12 for a VTR (FIG. 6) has a core 14 bonded to a fused glass 16.
facing each other through a head gap 18 formed by
The configuration is such that the magnetic field generated by the coil 20 acts between the gaps 18.

[Problem to be solved by the invention]

However, in all of the conventional magnetic heads mentioned above, the head gap where the cores face each other is used as the input/output part for the lines of magnetic force, but not all of the magnetic flux generated by the coil becomes leakage flux output from the facing part of the magnetic head, and the gap A short-circuit magnetic field line that directly penetrates the opposing core occurs,
There is a problem in that this results in loss and deteriorates the performance of the magnetic head. For this reason, the leakage magnetic flux becomes small, resulting in a disadvantage that the recording density cannot be improved. Conventionally, these short-circuit magnetic lines of force cannot be completely blocked, so there has been a limit to the improvement in recording density in this type of magnetic head.

The present invention has focused on the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic head that can shield short-circuit magnetic lines of force and can perform recording and reproduction with high efficiency.

[Means to solve the problem]

In order to achieve the above object, a magnetic head according to the present invention writes and/or reproduces recording magnetism in contact with or in close proximity to a magnetic recording medium, and a magnetic field line input/output portion of a head body is connected to a superconducting member. It is formed between the opposing surfaces of. The magnetic force line input/output section can be configured such that the coils are directly opposed to each other and formed as U-shaped coils so that the direction of the magnetic field generated between the opposing coils is directed toward the magnetic recording medium. Furthermore, it is also possible to use one of the superconducting members as a coil and the other as a superconducting base that is not energized. Furthermore, the coil of the superconducting member may be placed within an insulator and sandwiched between superconducting substrates.

(Function) According to the above configuration, lines of magnetic force do not penetrate inside the superconducting member due to the Meissner effect, so by arranging these members to face each other and use them as input/output portions for the magnetic field, the magnetic flux density is improved between the opposing surfaces. Therefore, it is possible to prevent the generation of leakage magnetic flux, suppress loss, and improve the recording density.Furthermore, by using the opposing superconducting members as current-carrying coils, it is possible to generate a strong magnetic field. This coil is
If configured as a letter-shaped coil, current can be passed from the same power source using a pair of terminals, and the structure can be simplified. In addition, if one of the opposing superconducting members is a superconducting coil and the other is a superconducting base, a strong magnetic field can be generated from the coil, and at the same time, due to the complete diamagnetic action between the opposing bases, there is a high magnetic flux density between the two. can be generated. Furthermore, by sandwiching an insulator between superconducting substrates and arranging a superconducting coil between the insulators, it becomes possible to confine a strong magnetic field on both sides of the coil.

〔Example〕

Embodiments of the magnetic head according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a perspective view of a magnetic head according to a first embodiment.

This magnetic head 20 is applied to the magnetic head for a hard disk shown in FIG. 4 described as a conventional example, and Af!
An insulator 24 made of A-1203, 5iOz, etc. is integrally provided on the end face of a slider 22 made of Z03-T i C, ferrite, A1203, etc. This insulator 24 has a coil 26 made of a superconducting material bent into a U-shape and arranged to face each other. ．． 26□ is embedded with the U half end face exposed on the surface. Conductive parts 28 of superconducting members extend from the superconducting coils 26, and terminals 301.30□ of Au, Al, Cu, etc. are connected to the ends thereof, and these terminals are exposed from the side of the insulator 24.

Here, the N TF that constitutes the coils 26□ and 26□
i "L material may be any of the conventionally known superconducting materials such as oxides of lanthanum, barium, and copper, or oxides of yttrium, barium, and copper. Therefore, for example, the current amount is considered to have good characteristics. In the case of yttrium-based superconducting materials, oxides of yttrium, barium, and copper are mixed in a ratio of 1:2:3 and fired at a temperature of around 900 degrees Celsius to form a superconducting material. It can be used as a raw material.Currently, it has only been confirmed that the superconducting phenomenon of such superconducting substances appears when the absolute temperature of liquid nitrogen reaches around 90°C, which is higher than the boiling point of liquid nitrogen. In the embodiment, the periphery of the magnetic head, including at least the coils 26. There is.

Of course, it goes without saying that if room-temperature superconducting materials emerge, cooling equipment will become unnecessary.

Hard disk magnetic head 20 having such a configuration
Then, the writing action is performed by passing a signal current through the terminals 30° and 30□, and the superconducting coil 26. ．． 2
Currents in opposite directions flow through 6□, and both conductive coils 2
6. ．． Lines of magnetic force emerge from between 26□. Since the opposing coil 261.26□ is a superconducting member, these lines of magnetic force are thrown out by the complete diamagnetism caused by the Meissner effect and are pushed into the narrow gap surface, forming a high-density magnetic field. Therefore, by placing the magnetic recording media facing each other, the magnetic recording media are magnetized according to the direction of the signal current due to the sharp, high-density lines of magnetic force generated between the coils 261 and 262, and as a result, high-density recording can be performed. can. In addition, the reproducing action is caused by the lines of magnetic force leaking from the magnetic recording medium into the superconducting coil 26. ．． It is detected by the induced current induced when it interlinks with 26□.

According to such embodiments, coil 26. ．． 26° is used as a superconducting member and these are placed facing each other, and since there is no Joule heat generation, a large signal current is passed through to generate a magnetic field, so it is possible to generate a very high magnetic flux density, making it possible to perform high-density recording and reproduction. Become.

In the above embodiment, the superconducting coil 26. ．． 26□ was bent to form a U-shape, but the opposing coil 2
6. ．． 26□ can also be configured as an independent coil (,
In this case, the terminals are also provided independently. Similar effects can be obtained with such a configuration.

Next, FIG. 2 shows a magnetic head 32 according to a second embodiment. The magnetic head 32 according to the second embodiment is applied to the magnetic head for a floppy disk shown in FIG. 5 described as a conventional example, and has a slider 34 made of calcium titanate, ferrite, etc. An L-shaped insulator 36 consisting of O, S to, etc. is attached. A base body 38 made of a superconducting member is integrally bonded to the outer surface of the insulator 36, which has a vertical column shape in the figure. A superconducting coil 40 is embedded in the insulator 36 along this joining line, and the straight outer surface of the coil 40 is exposed along the joining line. A pair of terminals 40 of this coil 40.
．． 40□ faces the lower part of the vertical support of the insulator 36, and the recording signal is input to this. Further, in this embodiment, the exposed portion of the coil 40 faces the track of the magnetic recording medium, but in order to erase the blurring at both ends of the track, a superconducting coil 42 for erasing is similarly provided on the insulator 36. They are located at both ends of the track. This is also terminal 42. ．． 42□ (only one is shown) is led to the outside to allow direct current to flow.

In the second embodiment, since the superconducting base 38 and the superconducting coil 40 are disposed in opposition to the superconducting base 38, the lines of magnetic force generated by the signal current flowing through the coil 40 are completely reversed by the Meissner effect of the opposing superconducting base 38. Since a strong and sharp magnetic field is formed between the base body 38 and the coil 40 by the magnetic action, a highly efficient magnetic head can be obtained.

FIG. 3 shows a magnetic head 44 according to a third embodiment. The magnetic head 44 according to this embodiment is applied to the VTR magnetic head shown in FIG. 6 described as a conventional example, and has an arc-shaped A slider 46 having an outer surface is formed of a superconducting member and is placed facing each other, and A2□O, SiO,
A plate-shaped insulator 48 made of a material such as the like is sandwiched therebetween. A superconducting coil 50 is embedded in the insulator 48, and its outer surface is exposed flush with the outer surface of the slider. The conductive portion 52 of the superconducting coil 50 is connected to a terminal 541.54□ provided below through the insulator 48 to supply a signal current to the coil 50.

In this embodiment, the magnetic field generated from the superconducting coil 50 is confined by the slider 46, which forms the double-sided superconducting base, so that a higher flaw density magnetic flux can be formed.

(Effects of the Invention) As explained above, according to the present invention, since the magnetic field line generation portion of the head body is formed by facing the superconducting members, the generated magnetic field is confined by the complete diamagnetic action and is directed to the excess area of the magnetic field lines. Since leakage can be prevented, high density magnetic recording and reproduction can be achieved. In addition, since a superconducting coil is used to generate the magnetic field, it is possible to create a strong magnetic field by passing a large current, and by arranging the superconducting base to face the coil, the magnetic flux is confined in a narrow space and a high-density magnetic field is created. , an excellent effect that enables sharp magnetic recording can be obtained.

[Brief explanation of the drawing]

1 is a partial perspective view of the magnetic head according to the first embodiment, FIG. 2 is a partial perspective view of the second embodiment, FIG. 3 is a partial perspective view of the third embodiment, and FIG. 4 is a partial perspective view of the magnetic head according to the first embodiment. FIG. 5 is a perspective view of a conventional magnetic head for a hard disk, FIG. 5 is a perspective view of a conventional magnetic head for a floppy disk, and FIG. 6 is a perspective view of a magnetic head for a VTR. 20.32.44...Magnetic hend, 24.36
...Insulator, 261.26z, 40.50...
... Coil, 38 ... Superconducting base, 46.
...Superconducting slider. Agent Patent Attorney Tomo Murakami - Figure 1 Kama / Figure 3 Can, Y East Figure 4

Claims (5)

[Claims] (1) A magnetic head that writes and/or reproduces recording magnetic information in contact with or in close proximity to a magnetic recording medium, characterized in that the magnetic force line input/output portion of the head body is formed between opposing surfaces of superconducting members. magnetic head. (2) In a magnetic head that writes and/or reproduces recording magnetic information in contact with or in close proximity to a magnetic recording medium, the head surface, which is formed so that the input and output parts of the magnetic field lines of the head body face each other, is made of superconducting material. A magnetic head characterized by being formed by a coil. (3) The opposing coil forming the magnetic field input/output section is U
3. The magnetic head according to claim 2, wherein the magnetic head is a single superconducting material coil formed in a letter shape. (4) In a magnetic head that writes and/or reproduces magnetic recording data in contact with or in close proximity to a magnetic recording medium, a coil formed of a superconducting material through which current is passed through the magnetic field input/output section of the head body; A magnetic head characterized in that it is formed between opposing superconducting material substrates. (5) In a magnetic head that writes and/or reproduces recording magnetic data in contact with or in close proximity to a magnetic recording medium, the magnetic field input/output portion of the head body is sandwiched between a gap of a core made of a superconducting material with an insulator. A magnetic head characterized in that it is formed by arranging coils of superconducting material.