JPH069081B2 - Magnetic recording / reproducing system - Google Patents

Description

The present invention relates to a magnetic recording / reproducing system for performing perpendicular magnetic recording used in tape recorders, VTRs, digital recording and the like. When recording a short wavelength signal on a magnetic recording medium,
In magnetic recording along the horizontal plane of the magnetic recording medium, the recording density is limited due to the self-demagnetization effect. On the other hand, in so-called perpendicular magnetic recording in which recording is performed in the thickness direction of the magnetic layer of the magnetic recording medium, antiparallel magnetization is given to each half-wavelength of the signal, so that attractive force acts between adjacent remanent magnetizations. Is in a state. Therefore, a sharp magnetization transfer (digital signal) that is not affected by demagnetization can be performed, and high-density short-wavelength recording can be performed.

This perpendicular magnetic recording is an excellent research by Iwasaki, Nakamura, and Ouchi of Tohoku University.

FIG. 1 is a sectional magnetization vector diagram of the perpendicular magnetic recording medium proposed by Iwasaki. The recording medium (1) is a non-magnetic substrate (1
-1), a high permeability magnetic thin film (for example, a sputtering film such as Fe-Ni) (1-2) is carried, and a perpendicular anisotropic magnetic thin film for recording (for example, a Co-Cr sputtering film) is further carried thereon. film)
It is a two-layer film magnetic medium carrying (1-3).

The perpendicular anisotropic magnetic thin film (1-3) for recording and the high magnetic permeability magnetic thin film (1-2) of the two-layer magnetic medium (1) have independent magnetization characteristics in perpendicular magnetic recording. Has been revealed.

FIG. 2 shows a structure for magnetizing this magnetic recording medium. A main magnetic pole (2) for magnetic recording and an auxiliary magnetic pole (3) for exciting the main magnetic pole (2) sandwiching the perpendicular magnetic recording medium (1) as shown in the figure.
In this arrangement, by exciting the coil (4) wound around the auxiliary magnetic pole (3) with the supply voltage (5), the magnetic field of the auxiliary magnetic pole, which is free from saturation, is generated at the tip of the main magnetic pole (2). Since the magnetic field is concentrated on the magnetic recording medium, the main magnetic pole is less likely to be saturated and recording can be efficiently performed on the magnetic recording medium. In this case, the high-permeability magnetic thin film has the effect of converging the magnetic field of the auxiliary magnetic pole (3), and it has been clarified that it operates extremely effectively.
However, in such a recording and reproducing system in which the main magnetic pole (2) and the auxiliary magnetic pole (3) are arranged with the magnetic recording medium (1) sandwiched between them, the main magnetic pole (2) and the auxiliary magnetic pole (3) are mutually opposed. However, in the practical realization of perpendicular magnetic recording, it is desirable to arrange the magnetic head on the magnetic surface side of the recording medium in the same manner as the magnetic head of the horizontal magnetic recording that has been performed so far. ing. Therefore, as shown in Fig. 3, the main pole (2)
Various studies are currently being conducted so that both the auxiliary magnetic pole (3) and the auxiliary magnetic pole (3) face the magnetic surface side of the magnetic recording medium of the magnetic recording medium (1).

However, since the magnetic head is an open magnetic circuit type only with such a circuit configuration, the recording current is large and the S /
There were drawbacks such as a decrease in N.

According to the present invention, in the perpendicular magnetic recording, the main magnetic pole and the auxiliary magnetic pole are integrally arranged on the magnetic surface side, and a part of the recording surface of the magnetic recording medium is separated to have a high magnetic permeability for reflux necessary for perpendicular magnetic recording. A thin film is provided in the magnetic recording medium to perform stable and reliable perpendicular recording, so that highly efficient recording and excellent S / N signal reproduction can be obtained.

FIG. 4 (a) shows an example of a 4-channel magnetic track diagram of the magnetic recording medium (1). In the following examples, each magnetic material,
The magnetic layer is a magnetic thin film. (1-4-1) is a perpendicular anisotropic magnetic thin film recorded by a perpendicular magnetic recording head, and (1-4-2) is for reflux provided for recording / reproducing (1-4-1). High permeability magnetic thin film track.

FIGS. 4 (b) and 4 (c) show a combined structure of a magnetic recording medium and a magnetic head for recording / reproducing this magnetic recording medium. As is clear from FIG. 4 (c), the high magnetic permeability magnetic thin film (1-) is formed on the substrate (1-1) of the magnetic recording medium (1).
2) (For example, Fe-Ni layer) is carried, and the track of the perpendicular anisotropic magnetic thin film (1-4-1) for recording and the same thin film as the high magnetic permeability magnetic thin film or another similar thereto. A magnetic recording medium configured to carry tracks of a high magnetic permeability magnetic thin film (1-4-2) substantially in parallel is provided. A magnetic head (6) in which the main magnetic pole (6-1) and the auxiliary magnetic pole (6-2) are integrated is arranged on the magnetic surface side of this magnetic recording medium. Both magnetic poles (6-1),
Since (6-2) is arranged on the same side of the magnetic recording medium, the dimensional accuracy between the magnetic poles (6-1) and (6-2) can be easily improved. The size of the magnetic head (6) is made to correspond to the sizes of the perpendicular anisotropic magnetic thin film (1-4-1) and the high-permeability magnetic thin film track (1-4-2). These can be made to face each other with high accuracy as shown in FIG. Considering the case where the magnetic head (6) is automatically tracked automatically, the main magnetic pole (6-1) of the magnetic head (6) is tracked to the recording perpendicular anisotropic magnetic thin film (1-4-1). The magnetic pole (6-2) of the magnetic head (6) is made to correspond to the high magnetic permeability magnetic thin film (1-4-2) track of the magnetic recording medium (1) at the same time. Can be moved. Therefore, when the exciting coil (7) of the magnetic head (6) is excited, the magnetic flux passes through the main magnetic pole (6-1) via the magnetic head yoke and the perpendicular anisotropic magnetic thin film (1-4 for recording) of the magnetic recording medium. -1) Exciting the track, and then high permeability magnetic thin film (1-2)
High-permeability recording / reproducing because a closed magnetic circuit circuit is directly constructed through the magnetic permeability, the high permeability magnetic thin film track (1-4-2), the auxiliary magnetic pole (6-2) of the magnetic head (6), and the magnetic yoke. It can be performed. FIG. 4 (d) shows the main magnetic pole (6) of the magnetic head in order to remove the magnetic flux directly interlinked between the main magnetic pole (6-1) and the auxiliary magnetic pole (6-2) of FIG. 4 (c).
It is shown that a magnetic head in which one track is placed between the sub-pole (1) and the auxiliary pole (6-2) can be used.

Next, the case where a magnetic tape is used as the magnetic recording medium of the present invention will be described.

FIG. 5 (a) shows the magnetization pattern of the 1-channel single track type. FIG. 5 (b) is a sectional view of this magnetic tape, and FIG. 5 (c) shows the magnetic head used for this magnetic tape. FIG. 6 shows a 1-channel single track type magnetic pattern. As is clear from FIG. 6 (b), high permeability magnetic thin film tracks are provided on both sides of the magnetic tape, and the magnetic head uses an M type magnetic head as shown in FIG. 6 (c). It is due to the fact. FIG. 7 shows an example of the two-channel two-track type, in which an insulating layer that divides into two is provided in the center, and FIG.
In order to divide each of the channels, an insulating material of (1-4-5) is used to divide the unnecessary high magnetic permeability magnetic thin film and the recording perpendicular anisotropic magnetic thin film. This is preferable in terms of S / N. FIG. 8 shows an example of an n-channel n-track type.

FIG. 9 shows a track diagram of a magnetic disk according to the present invention in the form of a recording medium. FIG. 9 (a) is a spiral track magnetic disk disc recording track diagram, and FIG. 9 (b) is a cross-sectional view of the spiral coil magnetic disk disc. Further, FIG. 9 (c) is a recording track diagram of a concentric magnetic disk disc,
1) shows a high permeability magnetic thin film track, and (7-2) shows a perpendicular anisotropic magnetic thin film. FIG. 9 (d) is a sectional view of a concentric magnetic disc disk. FIG. 10 is an enlarged view of the magnetic recording track of FIGS. 9 (b) and 9 (d). FIG. 10 (a) is a diagram showing a magnetic recording mechanism by a magnetic head (6) of a spirally wound magnetic disc disk, and its operation is the same as that of FIG. 4 (c).

FIG. 11 shows the manufacturing process of the magnetic disk according to the present invention. It can be manufactured according to the same process of recent thin film head manufacturing.

In the figure, (11-1) is a substrate, (11-2) is a lower high magnetic permeability magnetic thin film, (11-3) is an upper high magnetic permeability magnetic thin film track, and (11-4) is an upper perpendicular magnetic thin film track. .

As described above, according to the present invention, the main magnetic pole and the auxiliary magnetic pole are provided on the magnetic surface side of the magnetic recording medium in which the high magnetic permeability magnetic material layer track and the perpendicular anisotropic magnetic layer are formed in parallel on the high magnetic permeability magnetic material. Since the magnetic heads that are integrated with each other are arranged, the dimensional accuracy between the main magnetic pole and the auxiliary magnetic pole can be easily improved, and both magnetic poles are formed into a high magnetic permeability magnetic layer track and a perpendicular anisotropic magnetic layer, respectively. It is possible to easily and accurately face each other.

Further, since the magnetic head in which the main magnetic pole and the auxiliary magnetic pole are integrated is slid on the recording perpendicular anisotropic magnetic layer or the high magnetic permeability magnetic layer track of the magnetic recording medium for recording and reproducing, magnetic recording efficiency is improved. Can be extremely improved, and excellent signal reproduction with S / N can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional perpendicular magnetic recording medium, FIGS. 2 and 3 are configuration diagrams of a conventional magnetic recording medium, and FIG. 4 (a) is a 4-channel magnetic track diagram of the magnetic recording medium. Fig. (B) (c)
Shows a block diagram showing an embodiment of the present invention, and FIG. 4 (d) shows a block diagram showing another embodiment of the present invention. Fig. 5 (a) (b)
8C, 8A, 8B, and 8C show a magnetic pattern diagram, a magnetic tape sectional view, and a magnetic head configuration diagram of the present invention using a magnetic tape. 9 (a), (b), (c), and (d) are a track diagram and a cross-sectional view of the disk for use in the method of the present invention using a magnetic disk disk. FIGS. 10 (a) and 10 (b) are enlarged views of FIGS. 9 (b) and 9 (d), and FIG. 11 is a manufacturing process diagram of a magnetic disk for use in the method of the present invention. In the figure, (1) is a magnetic recording medium, (1-1) is a non-magnetic base, (1-2) is a high-permeability magnetic material, (1-4-1) is a recording perpendicular anisotropic magnetic layer, and 1-4-2) is a high-permeability magnetic layer track, (6) is a magnetic head, (6-1) is a main pole, (6-2) is an auxiliary pole, and (1-4-5) is an insulating material ( Insulation part). In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A high-permeability magnetic material track is carried on a non-magnetic base, and a high-permeability magnetic layer track connected to the high-permeability magnetic material and a perpendicular anisotropic magnetic layer track for recording are parallel to each other. On the magnetic surface side of the magnetic recording medium thus formed, a magnetic head in which a main magnetic pole and a sub magnetic pole are integrated is arranged, the perpendicular anisotropic magnetic layer track is opposed to the main magnetic pole, and the high magnetic permeability A magnetic recording / reproducing method in which a layer track is slid so as to face the sub-pole to perform recording or reproduction.