JPH01208712A - Perpendicular magnetic recording system and magnetic head used for same - Google Patents

Abstract

PURPOSE:To perform ultra-fine recording by providing superconducting films respectively provided with minute openings between a magnetic line of force generating means and recording medium as slits and performing the recording by magnetizing the recording medium by the magnetic line of force passing through the slits of the magnetic line of force produced by the magnetic line of force generating means. CONSTITUTION:Superconducting film slits 13 and 14 are provided perpendicular to the magnetic field 12 produced when a signal current flows through a coil 11. The slits 13 and 14 are respectively provided with pin holes 15 and 16 and are arranged in such a way that part of the magnetic flux 17 of the magnetic field 12 by means of the coil 11 can pass through the pin holes 15 and 16. A tape-like recording medium 18 is placed perpendicular to the magnetic flux 17 in the vicinity of the superconducting film 14. The magnetic flux 17 passing through the pin holes 15 and 16 is projected on the recording medium 18 as a pin hole having a diameter which is almost the same as that of the pin holes and magnetizes the vertical particles of a magnetic substance in a prescribed direction. Therefore, recording of a fine particle level becomes possible and the recording density can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a perpendicular magnetic recording system and a magnetic head used therein.

[Conventional technology]

FIG. 5 is a diagram for explaining the outline of the conventional perpendicular magnetic recording system.

The magnetic head is made of a magnetized raw material, and has a main magnetic pole 4 in the form of a strip with a thickness of approximately 1 μm, and an auxiliary magnetic pole 8 having a winding m<coil) 2.
6 recording medium 3 composed of i1 has a particle diameter of 0.1
Column-shaped fine particles of about 100 yen are grown perpendicularly on the base 3a, and are located between the main magnetic pole 4 and the auxiliary magnetic pole 1.

When recording a signal, a signal with a forward and reverse voltage is applied to the coil 2 of the auxiliary magnetic pole 1, the main magnetic pole 4 is excited, and this perpendicular magnetic field 5 causes the parallel moving medium 3 disposed in close proximity to each other.
The signal is recorded.

Furthermore, when reproducing a signal, the magnetic flux of the main magnetic pole 4 generated by the magnetic field from the parallel-moving medium 3 is induced to the auxiliary magnetic pole 1, and a signal is induced in the coil 2, thereby performing reproduction.

(Problems to be Solved by the Invention) In the conventional magnetic head described above, the size of the main pole 4 is larger than the size (about 1 μ) of the columnar particles constituting the recording medium, and a large number of particles are produced at a time. Because they become magnetized, there is a limit to their recording density, making it impossible to perform ultrafine perpendicular magnetic recording in which recording is performed at the microparticle level.

The main magnetic pole needs to have a certain size because if it is too small, the generated magnetic field will be weak and stable writing will not be possible.

In addition, in order to strengthen the magnetic coupling, the main pole 4 and the medium 3 must be placed extremely close to each other, and in some cases, in contact with each other, so that they are susceptible to physical damage such as abrasion due to the movement of the medium 3a. It has the disadvantage of being easy to use.

Furthermore, the conventional perpendicular magnetic recording head has a cumbersome structure in that both the auxiliary and main &fi poles must be disposed on both the front and back surfaces of the recording medium 3.

[Means to solve the problem]

The present invention solves the above-mentioned contradictory problems between the size of the magnetic head and the recording density, and the contradictory problems between the distance between the magnetic head and the medium and the strength of the magnetic field, and makes ultra-fine recording possible. purpose.

In order to achieve this objective, the perpendicular magnetic recording method of the present invention interposes a superconductor film having a small opening in a part as a slit between the magnetic force line generating means and the recording medium, so that the magnetic force lines generated by the magnetic force line generating means Among the magnetic lines of force, those that pass through the minute opening magnetize the recording medium and perform recording.

In addition, a superconductor film having a small opening in a part is interposed as a slit between the head coil that performs current-to-magnetic field conversion and magnetic field-to-current conversion, and the magnetic field lines generated from the head coil are Among them, the recording medium is magnetized by the material that has passed through the minute opening to perform recording,
Of the magnetic field generated from the recording medium, the magnetic field that has passed through the minute opening is converted into a current by the head coil to reproduce the signal.

Further, the magnetic head of the present invention includes a magnetic field line generating means and a superconducting film having a function of selectively passing a part of the magnetic field lines generated from the magnetic field line generating means and having a micro opening serving as a slit in a part. It is equipped with.

It also has a head coil that performs current-to-magnetic field conversion and magnetic field-to-current conversion, and a function to selectively pass a part of the magnetic field lines generated from the head coil or a part of the magnetic field from the recording medium. The superconductor film has a microscopic opening serving as a slit.

[Effect]

Focusing on the Meissner effect (magnetic field shielding effect), in which the magnetic field is always zero inside a superconductor, the resolution can be improved by using the superconductor as a slit to squeeze a sufficiently strong magnetic field down to the particle level and recording. high and also
It is possible to realize a perpendicular magnetic recording system in which the head is not physically damaged. Furthermore, by adopting a head coil that also serves as a magnetic field generation and detection means, and placing it only on one side of the recording medium surface, the above characteristics can be achieved, and a more compact magnetic recording device can be expected. can.

(Example) Next, an example of the present invention will be described with reference to the drawings.

Example 1 FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a plan view of a superconductor slit.

When a signal current flows through the coil 11, a magnetic field 12 is generated. Superconductor film slit 13 perpendicular to this magnetic field 12
and 14 are arranged. This superconductor membrane slit 13 and! 4 each have a pinhole 15.16,
The arrangement is such that a part of the magnetic flux 17 of the magnetic field 12 generated by the coil 11 passes through the pinholes 15 and 16. This magnetic flux 17
A tape-shaped recording medium 18 is placed perpendicularly to the superconductor film slit 14 and near the superconductor film slit 14 .

This recording medium 18 has columnar fine particles grown vertically on a substrate 18a.

The superconductor film slit 13 or 14 has a substrate made of a non-magnetic material such as glass or plastic, and a superconductor film slit 13a (14a) is deposited or coated on one side of the substrate to a thickness of about 0.5 μm. The center has a diameter of 0
．． A pinhole 15 (16) of 1 to 0.2 μm is formed by etching technology.

The two superconductor membrane slits 13, 14 are placed parallel to each other and perpendicular to the magnetic field at a predetermined distance.

The magnetic flux 17 passing through each pinhole 15, 16 is projected onto the recording medium 18 as a pinhole having the same diameter as the pinhole, and magnetizes the magnetic perpendicular particles in a predetermined direction. The magnetic particles are 061 to 0.2. However, since the beam 17 has an ultra-fine magnetic field east line diameter at the level of a fine particle, recording at the level of a fine particle is possible, and the recording density can be improved. Furthermore, since the magnetic field east line beam 17 passes through two pinholes of the same diameter, the spread of the beam is very small even at distant locations, and the direction is specified. Therefore, the distance between the magnetic medium 18 and the slit 14 can be made much greater than in the past.

Next, it will be explained that the magnetic head according to the present invention is also effective as a reading head.

That is, the pinhole 15 of the two slits 13 and 14
．． Only the magnetic flux lines of the media particles on the line passing through 16 pass through the sensing coil 11 and excite the current. Therefore, reading with high resolution can be performed and a signal with few noise components can be extracted.

Embodiment 2 FIG. 3 is a diagram showing the configuration of a second embodiment of the present invention, and FIG. 4 is a plan view of a superconductor slit.

This embodiment is an example in which a part of the magnetic recording head technology according to the present invention is applied to a conventional recording head to contribute to its improvement.

M1 conductor slit 23 between the main pole 4 and the recording medium 3
and 24 are inserted. main! The magnetic flux lines 5 of the ff pole 4 are projected onto the magnetic medium 3 as a narrow beam and are magnetically recorded. Conversely, in magnetic reading, the coil 2 of the auxiliary magnetic pole 1 detects the magnetism of particles on a line passing through the pinholes 25, 26 of the slits 23, 24 in the recording magnetic particles on the medium 3.

In the slits 23, 24 used in this example, the shape of the pinholes 15, 16 is a rectangular shape whose width is about the same as the pinhole diameter in the above example, but whose length is several times that diameter. It becomes. This is because the rectangular main magnetic pole 4 of the sub-depth type is used, and thereby it is possible to record on the strip-shaped magnetic recording medium 3 and read signals from the recording medium.

In this embodiment, there are a plurality of particles to be recorded, and recording and reading can be performed using a strong magnetic flux.

Although the present invention has been described above using examples, the present invention is not limited to these examples and can be modified in various ways. For example, if the magnetic field during signal reproduction becomes too weak due to interference between the recording medium and the coil, a superconducting sensor with high detection sensitivity may be provided. This ensures reliable signal reproduction.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(1) The magnetic flux beam used for recording can be made comparable in diameter to the particle size of the magnetic recording medium, making it possible to pursue the recording resolution to the utmost limit and obtain the maximum recording density. As a result, the perpendicular magnetic recording method, which is said to have a high density, can be made even higher density.

(2) It is possible to separate the magnetic head from a medium such as a magnetic tape, thereby preventing physical damage such as mutual friction, and allowing each to be used semi-permanently.

(3) By arranging the recording head only on one side of the magnetic medium, the recording apparatus can be made smaller.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the configuration of the first embodiment of the present invention, Figure 2 is a plan view of the superconductor slit used in Figure 1, and Figure 3 is the second embodiment of the present invention. A diagram for explaining the configuration of. FIG. 4 is a plan view of the superconductor slit used in FIG. 3, and FIG. 5 is a diagram for explaining the configuration of a conventional example. 11... Head coil, 12-... Magnetic field, 13.14... Superconductor film slit, 15.16-...
- Pinhole, 17-... Lines of magnetic flux generated from a coil to which a signal is applied and passing through two pinholes, 18... Magnetic recording medium.

Claims (1)

[Claims] 1. A superconductor film having a microscopic opening in a part is interposed as a slit between the magnetic force line generating means and the recording medium,
A perpendicular magnetic recording method in which a recording medium is magnetized by lines of magnetic force generated from the line of magnetic force generator that pass through the minute opening to perform recording. 2. Two or more of the superconductor films are provided, and these superconductor films are provided perpendicularly to the magnetic field generated from the magnetic field line generating means and parallel to each other, and each micro opening has an overlap. 2. The perpendicular magnetic recording system according to claim 1, wherein these openings are provided on the central axis of the magnetic field. 3. A superconductor film having a small opening in a part is interposed as a slit between the head coil that performs current-to-magnetic field conversion and magnetic field-to-current conversion, and the magnetic field lines generated from the head coil are , a perpendicular device in which a recording medium is magnetized and recorded by the magnetic field that has passed through the minute aperture, and a head coil converts the magnetic field generated by the recording medium that has passed through the minute aperture into a current to reproduce a signal. Magnetic recording method. 4. A magnetic device comprising a magnetic field line generating means and a superconductor film having a function of selectively passing a part of the magnetic field lines generated from the magnetic field line generating means and having a micro opening serving as a slit in a part thereof. head. 5. A head coil that performs current-to-magnetic field conversion and magnetic field-to-current conversion, and a function to selectively pass a part of the magnetic field lines generated from the head coil or a part of the magnetic field from the recording medium, and A magnetic head comprising a superconductor film having minute openings serving as slits.