JP2000123437A - Recording and reproducing method of magneto-optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magneto-optical recording medium which has a good recording and reproducing performance and is capable of conducting a high density recording. SOLUTION: In this method, a recording and a reproducing are conducted by illuminating light beams onto a magneto-optical recording medium which has a memory layer and tracks having the shape of concentric or spiral shapes. In the illuminated spot of the illumination light beams formed on the medium during a recording and a reproducing, the size of the spot along the longitudinal direction of the track is made larger than the size of the spot in the width direction of the track.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording medium capable of high-density recording and reproduction.

[0002]

2. Description of the Related Art Rewritable optical disk systems are roughly classified into the following two types. The first type is a magneto-optical recording medium in which a magneto-optical film is formed as a recording layer on a substrate, and the second type is a phase-change type recording medium in which a phase-change type film is formed as a recording layer. Hereinafter, the magneto-optical recording medium will be described.

In recording information, a laser beam is irradiated on a magneto-optical recording medium. The irradiated spot portion of the magneto-optical film irradiated with the laser light is heated. The heated irradiation spot portion can easily change the direction of magnetization. When a magnetic force is applied to the region where the direction of magnetization can be easily changed using an external magnetic field, the direction of magnetization of the magneto-optical film changes according to the direction of the external magnetic field. By utilizing such properties, recording is performed by changing the direction of magnetization of the magneto-optical film to a direction corresponding to the recorded information (controlled by an external magnetic field).

[0004] Reproduction is performed by irradiating a magneto-optical film, whose magnetization direction has changed in accordance with information, with a laser beam for reproduction, and detecting reflected light. This reflected light has a Kerr rotation angle that changes in accordance with the direction of magnetization that has changed with the recorded information. Information is reproduced by detecting the reflected light having the different Kerr rotation angles. In order to perform high-density recording, it is effective to make the size of the recording mark smaller. However, there is a limit to the size of a reproducible recording mark. This is due to the fact that there is a limit to the minimum diameter of the irradiation spot of the laser beam irradiated during reproduction.

[0005] Normally, reproduction is performed in such a state that one recording mark enters the irradiation spot. However, if the recording marks are made smaller and the interval between the marks is made smaller for higher density, a plurality of recording marks will be included in the irradiation spot. In such a state, information from a plurality of recording marks is reproduced, and information other than the information to be reproduced is also detected, and the reproduction becomes impossible.

An irradiation spot is formed by narrowing a laser beam with an objective lens. The diameter of the irradiation spot depends on the wavelength of the laser beam and cannot be made smaller than the wavelength of the laser beam. Therefore, even if the size of the recording mark is reduced to increase the recording density, the irradiation spot cannot be reduced to correspond to the size of the recording mark.

As a method of reproducing a recording mark smaller than that of the related art, reproduction by MSR (magnetic super-resolution) is known. When reproducing information recorded on a magneto-optical recording medium having an MSR function, a laser beam applied to the medium is irradiated with a laser beam having a higher intensity than when a general magneto-optical recording medium is used. Thereby, a region having a particularly high temperature is formed in the irradiation spot, and a region having a relatively low temperature is formed in a region other than the high temperature portion. Thus, only the recorded information in one of the high-temperature area and the low-temperature area or the area (medium-temperature area) between the high-temperature area and the low-temperature area is to be reproduced.

[0008] Such MSRs include CAD, FAD,
There is a method such as a double mask (D-RAD). For example, C
The AD method uses a material that is an in-plane magnetized film at room temperature as a reproducing layer, but becomes perpendicularly magnetized when irradiated with a laser beam and becomes high temperature, and reproduces only a region in the perpendicularly magnetized state. . Further, there is a magnetostatic coupling CAD system.
This method has a film configuration in which a nonmagnetic layer such as SiN is formed between a reproducing layer and a memory layer. With this configuration, higher-density reproduction can be performed than in the above-described normal CAD system.

Japanese Patent Application Laid-Open No. 4-255946 proposes a double mask method (D-RAD method) in which reproduction is performed in an area between a high temperature area and a low temperature area. This method will be described with reference to FIG. FIG.
Describes the relationship between the laser beam irradiation spot and the temperature distribution of the medium when reproducing a double-mask medium (the figure is a view of the medium from above).

As can be seen from FIG. 4, the conventional irradiation spot 1 has a circular shape. The medium 2 moves from the right side to the left side on the paper. Therefore, a temperature distribution occurs on the surface of the medium 2 in the traveling direction. As shown in FIG. 4, the temperature distribution related to the reproduction is on the left side of the current position of the irradiation spot 1 (corresponding to the area where the irradiation spot existed before now).
Oval shape. The region 3 is a high-temperature region where the temperature is the highest, and the region 5 is a low-temperature region where the temperature is the lowest. The region 4 is a region (intermediate temperature) sandwiched between the high temperature region 3 and the low temperature region 5. The high-temperature region 3 and the low-temperature region 5 serve as a mask, and only the recording marks 6 located in the region 4 sandwiched between the high-temperature region 3 and the low-temperature region 5 are reproduced (see FIG. 5 for the change in the magnetization direction of each magnetic film). Want).

FIG. 6 is a diagram for explaining the FAD system. The FAD method uses a material that has a perpendicular magnetization state at room temperature as the reproducing layer, and when the laser beam is irradiated and the temperature becomes high, the cutting layer reaches the Curie point to break the bond between the reproducing layer and the memory layer. is there. When a reproducing magnetic field is applied in a state where the coupling is broken, a mask is generated in a high-temperature region, and only information in a relatively low-temperature region is reproduced. Such a method is a method in which the recording characteristics of a short mark having a shorter recording mark are more excellent than that of the normal CAD method as described above. Also in this case, the conventional irradiation spot 1 has a circular shape as shown in the figure, and an elliptical region having a temperature distribution is formed on the left side of the irradiation spot (on the medium traveling direction side).

As described above, the conventional magneto-optical recording medium having the MSR function uses the temperature distribution without reducing the irradiation spot of the reproduction laser beam, and reproduces the data in an area smaller than the actual irradiation spot. Can be. For this reason, it is possible to reproduce a medium recorded at a high density with smaller recording marks than in the related art.

[0013]

SUMMARY OF THE INVENTION The present inventor has searched for a method for further increasing the density of a magneto-optical recording medium having an MSR function recorded at a high density. Therefore, an attempt was made to achieve higher density by further narrowing the track pitch. However, as a result of reproduction of a medium with a narrow track pitch, noise is included in a reproduction signal, so that proper reproduction cannot be performed, and further higher density cannot be achieved.

Such a problem becomes remarkable in the case of the FAD system, and occurs slightly in the case of the double mask system.

[0015]

In order to solve the above-mentioned problem, the cause of the problem was searched. The causes were as follows. As can be seen from FIGS. 4 and 5, the elliptical portion relating to the reproduction of the medium of the double mask system is in a state of protruding into the track adjacent to the track involved in the reproduction. As a result, the recording marks of the adjacent tracks also enter the elliptical area related to the reproduction, and the recording marks of the adjacent tracks are also reproduced (crosstalk).
That was the cause.

In the case of the double mask method, a mask (front mask) 3 in a high-temperature region is formed.
Although the crosstalk problem is less than that of the AD system, it has been found that the aperture region slightly protrudes into an adjacent track in order to increase the temperature until a low-temperature region mask (rear mask) is formed. When the wavelength is 68
When a medium of land / groove recording system is reproduced using a reproducing system having a diameter of 5 nm and an NA of 0.55, crosstalk increases when the track is set to 0.5 μm or less even if the reproducing method is a double mask system. It has also been found that it is impossible to further increase the density by narrowing the track.

Further, the FAD system is a system in which a mask is formed on the rear portion as described above. Since the front portion becomes an aperture, the recording density in the longitudinal direction of the track is improved. However, there is a limit to narrowing the track due to the influence of crosstalk as described above.
It turned out that it is only about the same level as a normal recording medium without the SR function.

Specifically, the wavelength is 685 nm, When a reproducing system in which A is 0.55 is used, when the track pitch is set to 0.85 μm or less, crosstalk becomes remarkable,
It was difficult to further narrow the track. SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a reproducing method for a magneto-optical recording medium having an MSR function that does not cause crosstalk even when a track pitch is narrowed.

Therefore, first, a method for recording / reproducing a magneto-optical recording medium in which recording / reproduction is performed by irradiating light to a magneto-optical recording medium having a memory layer and having concentric or spiral tracks, A recording spot on the magneto-optical recording medium, wherein an irradiation spot of the irradiation light, which is formed on the medium during the recording and reproduction, is longer in a longitudinal direction of the track than in a width direction of the track. , A reproduction method (claim 1). " Second, "a reproducing layer made of a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate, and formed on the reproducing layer, exhibiting an in-plane magnetization state at room temperature, and being irradiated with reproducing light during reproduction. And a reproducing intermediate layer exhibiting a perpendicular magnetization state, and a memory layer formed on the reproducing intermediate layer and exhibiting a perpendicular magnetization state. The Curie temperature of the reproducing intermediate layer is such that the reproducing intermediate layer is perpendicular to the in-plane magnetization state. In the recording and reproducing method of a magneto-optical recording medium capable of magnetic super-resolution reproduction at a temperature higher than the temperature at which the magnetic state changes, the recording spot formed on the medium, the irradiation spot of irradiation light irradiated at the time of reproduction, A recording / reproducing method for a magneto-optical recording medium, characterized in that a dimension in a longitudinal direction of the track is longer than a dimension in a width direction of the track (claim 2). " Third, "a reproducing layer composed of a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate, and formed on the reproducing layer, exhibiting an in-plane magnetization state at room temperature, and being irradiated with reproducing light during reproduction. A cutting intermediate layer formed on the intermediate reproducing layer, exhibiting a perpendicular magnetization state, and having a Curie temperature equal to or higher than a temperature at which the reproducing intermediate layer changes from an in-plane magnetization state to a perpendicular magnetization state. Recording and reproduction of a magneto-optical recording medium capable of reproducing magnetic super-resolution having a memory layer formed on the cutting layer, having a Curie temperature higher than the Curie temperature of the cutting layer, and exhibiting a perpendicular magnetization state. The method according to claim 1, wherein an irradiation spot of the irradiation light formed at the time of recording and reproduction formed on the medium has a dimension in a longitudinal direction of the track longer than a dimension in a width direction of the track. Medium Recording, playback method (claim 3). " Fourthly, a “reproducing layer made of a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate, a reproducing intermediate layer formed on the reproducing layer and exhibiting a perpendicular magnetization state at room temperature, In the recording and reproducing method of a magneto-optical recording medium capable of reproducing magnetically super-resolution having a memory layer having a perpendicular magnetization state formed on the medium, the irradiation light formed on the medium during the recording and reproducing is irradiated. Irradiating spot, the recording of the magneto-optical recording medium characterized in that the longitudinal dimension of the track is longer than the dimension of the track in the width direction,
Reproduction method (Claim 4). " Fifth, "a recording layer made of a magnetic material having a compensation temperature between room temperature and the Curie temperature on the memory layer and having a Curie temperature higher than the Curie point of the memory layer, In a recording and reproducing method for a magneto-optical recording medium having an optical modulation overwrite function having an initialization layer formed of a magnetic material and exhibiting a perpendicular magnetization state at room temperature, the recording and reproducing are performed on the medium during the recording and reproducing. 5. The light according to claim 1, wherein the irradiation spot of the irradiation light is longer in a longitudinal direction of the track than in a width direction of the track. Recording and reproducing method of magnetic recording medium (Claim 5) ". Sixth, "an intermediate layer made of a magnetic material exhibiting a rare earth metal-dominant magnetization state at room temperature on the memory layer, and a compensation temperature formed between the intermediate layer and room temperature and Curie temperature, A recording layer comprising a magnetic layer having a Curie temperature higher than the Curie point of the memory layer; a switch layer comprising a magnetic layer formed on the recording layer; and a perpendicular magnetization state formed at room temperature on the switch layer. In the recording and reproducing method of a magneto-optical recording medium having a light modulation overwrite function having an initialization layer made of a magnetic material exhibiting, the recording spot formed on the medium, the irradiation spot of irradiation light irradiated at the time of reproduction, 5. The method for recording and reproducing information on a magneto-optical recording medium according to claim 1, wherein the dimension in the longitudinal direction of the track is longer than the dimension in the width direction of the track. Providing (claim 6). "

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Formation of magneto-optical recording medium] (1) Hereinafter, a magneto-optical recording medium (D-RAD-MSR) having a double-mask type MSR function will be described as an example (see FIG. 2). ). A disk-shaped substrate having a diameter of 86 mm and having grooves formed by the 2P method is used.

First, a substrate made of SiN and having a thickness of about 7
A 0 nm lower protective film is formed. A magneto-optical film which shows a perpendicular magnetization state when irradiated with a laser beam at normal temperature is formed thereon as a reproducing layer by a sputtering method. In this embodiment, a reproducing layer made of GdFeCo and having a thickness of about 30 nm is formed. The composition of GdFeCo is Gd: 2
5 atm%, Fe: 60 atm%, Co: 15 atm%
And

On the reproducing layer, a magneto-optical film showing an in-plane magnetization state at room temperature is formed as a reproducing intermediate layer. In the present embodiment, Gd
A reproducing intermediate layer made of Fe and having a thickness of about 50 nm is formed by a sputtering method. The composition of GdFe is Gd:
29 atm% and Fe: 71 atm%. This composition shows a perpendicular magnetization state at about 130 ° C. A memory layer capable of taking a perpendicular magnetization state is formed on the reproducing intermediate layer. In this embodiment, it is made of TbFeCo and has a thickness of about 50.
A memory layer having a thickness of nm is formed by a sputtering method. The composition of TbFeCo is as follows: Tb: 21 atm%, F:
e: 64 atm%, Co: 15 atm%.

Further, on top of this, a film of SiN having a thickness of about 7
An upper protective film having a thickness of 0 nm was formed by a sputtering method. The magneto-optical recording material used in the present invention is not limited to the above-mentioned materials, and generally used magneto-optical materials can be used. (2) Next, an example of a magneto-optical recording medium of the FAD system will be described.

The substrate is the same as that of the above-mentioned D-RAD-MSR, and a lower protective film and a reproducing layer having the same material, thickness and composition are formed. On the reproducing layer, a magneto-optical film showing a perpendicular magnetization state at room temperature is formed as a cutting layer. In the present embodiment, a cutting layer made of TbFe and having a thickness of about 20 nm was formed by a sputtering method. The composition of TbFe is Tb: 2
0 atm% and Fe: 80 atm%. The Curie point for this composition is about 140 ° C.

Further, a memory layer is formed on the cutting layer. The memory layer was made of the same material, film thickness, composition and film forming method as those of the above (1). Then, an upper protective film made of SiN and having a thickness of about 70 nm was formed on the memory layer. [Recording / Reproducing Apparatus] The recording / reproducing apparatus according to the present embodiment comprises:
It has the following configuration.

The recording / reproducing apparatus comprises: a rotating system for the optical disc;
It comprises a laser light source for recording and reproduction, an optical system, a reproduction magnetic field, a reproduction system and a signal processing system. still,
The initialization magnetic field, the recording magnetic field, and the reproducing magnetic field are 1 or 2
Magnetic field generator (when the reproducing magnetic field is different from the recording magnetic field (when the magnetic field strengths are different), two magnetic fields are generated).

The laser light source for recording / reproducing is λ = 680.
nm, and comprises an optical system such as a semiconductor laser having a numerical aperture (NA) = 0.55 and a lens. The reproduction system includes a detector such as a photodiode and an optical system for transmitting light to the detector. In the case of a circular irradiation spot that has been conventionally irradiated, the diameter is about 1.1.
The irradiation spot according to the present invention was about 1.3 μm in the track length direction and about 0.9 μm in the track width direction. However, the size in the track width direction of the elliptical shape according to the present invention, which is formed on the left side of the irradiation spot (in the traveling direction of the medium) and has a temperature distribution contributing to reproduction, is not limited to the above size. Any size is acceptable as long as it does not protrude into an adjacent track. Even if it protrudes, any size may be used as long as the recording mark recorded on the adjacent track does not have an elliptical area and does not cause crosstalk.

The present invention in which the irradiation spot is made elliptical as in the present invention can be carried out by a conventionally known method using, for example, a light shielding plate. [Recording method] First, a laser beam having an intensity (erasing power) capable of erasing information recorded on the optical disk is applied. In the present embodiment, it is set to about 9 mW. A memory field is initialized by applying an initialization magnetic field to a region heated by irradiation with laser light.

Next, information is recorded on the memory layer formed on the initialized optical disk. The record is about 8mW
A laser beam of intensity (recording power) is applied, and at the same time, a recording magnetic field is applied to record information. Irradiation and non-irradiation of laser light can be performed in accordance with information to be recorded, and recording is performed by irradiating laser light only when recording information.
Note that the information recording method is not limited to such a method, and a magnetic field modulation recording method in which an external magnetic field applying means such as an electromagnet is used externally and modulated according to the information to be recorded and recorded is also possible. It is.

[Reproduction Method] At the time of reproduction, the optical disk is rotated at a linear speed of about 9 m / s. In the case where reproduction is performed by the recording / reproducing apparatus used in the present embodiment, the intensity (reproducing power) of the reproducing laser beam applied to the optical disk is about 3.
It was set to 5 mW. Then, the optical disk is irradiated with the laser light after passing through a polarizing filter. At this time, a magnetic field in a direction opposite to the direction of the magnetic field applied during recording is applied as a reproducing magnetic field. The magnetic field is 1000 Oe.

The laser light irradiated for reproduction is reflected on the reproduction layer, and the reflected light is converted into an electric signal by a photodetector and reproduced. As in the present invention, by making the diameter of the irradiation spot of the laser beam irradiated at the time of reproduction smaller in the track width direction than before, the D-RAD-
In both the MSR method and the FAD method, crosstalk can be greatly reduced as compared with the case where reproduction is performed using a conventional irradiation spot diameter. This results in good jitter.

The recording / reproducing method of the present invention uses, for example, C
It can be applied to other MSRs such as AD. In the [D-RAD + light modulation DOW] configuration, a reproducing layer, a reproducing intermediate layer, a cutting layer, a memory layer, an intermediate layer, a recording layer, a switch layer, and an initialization layer are sequentially formed by sputtering from the substrate side.

The reproducing layer is a magnetic layer made of GdFeCo, the composition is Gd25Fe60Co15, and the film thickness is 30n.
m. The reproducing intermediate layer is a magnetic layer made of GdFe, and has a composition of Gd29Fe71 and a thickness of 50 nm. The memory layer is a magnetic film made of TbFeCo, the composition is Tb21Fe69Co10, and the film thickness is 50 nm.
It is.

The cutting layer is a magnetic film made of TbFe, has a composition of Tb21Fe79, and has a thickness of 20 nm. The intermediate layer is a magnetic layer made of GdFeCo, has a composition of Gd32Fe64Co4, and has a thickness of 10 nm. The recording film is a magnetic layer made of DyFeCo, the composition is Dy26Fe44Co30, and the film thickness is 20 nm.

The switch layer is a magnetic film made of TbFeCo, the composition is Tb17Fe73Co10, and the film thickness is 1
2 nm. The initialization layer is a magnetic film made of TbFeCo, the composition is Tb20Fe16Co64, and the film thickness is 20.
nm. In the magneto-optical recording medium having such a film configuration, during reproduction, high-resolution reproduction can be performed by the magnetic layers of the reproduction layer, the reproduction intermediate layer, the cutting layer, and the memory layer. Further, at the time of recording, information is overwritten only by applying a recording beam without applying a recording magnetic field. At this time, the recording beam is modulated into two levels, a high level and a low level, and these two levels are values specified in advance for the magneto-optical recording medium. The direction of the magnetic domain formed in the memory layer is opposite between the case where the low level recording beam is irradiated and the case where the high level recording beam is irradiated. This depends on the functions of the recording layer, the switch layer, and the initialization layer.

As a result, information is overwritten on the memory film by the recording beam whose intensity has been modulated to a high level and a low level. Recording on such a magneto-optical recording medium,
Recording and reproduction were performed using an irradiation spot of the irradiation light (recording beam) irradiated at the time of reproduction having a dimension as in the present invention.

As a result, high-density recording is possible, and crosstalk of a magneto-optical recording medium capable of overwriting can be reduced, so that a higher-performance magneto-optical recording medium can be obtained.

[0038]

According to the present invention, when reproducing a magneto-optical recording medium having a magnetic super resolution (MSR) function, reproduction is performed using an irradiation spot having a longer track length than the track width, as in the present invention. By doing so, the track pitch can be narrowed with almost no crosstalk during reproduction. Therefore, it is possible to obtain a magneto-optical recording medium in which no crosstalk occurs and the recording density is further improved. In particular, if this method is applied to a magneto-optical recording medium having an MSR function, it is possible to perform recording and reproduction on a magneto-optical recording medium capable of higher density recording.

It is also possible to record information on a magneto-optical recording medium using a laser beam having an irradiation spot as in the present invention, and to perform recording while reducing the thermal influence in the track width direction. Is possible. Therefore, at the time of recording, the recording information of the adjacent track is hardly erased, and it is possible to perform recording that is strong in cross-erase.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a spot shape and a temperature distribution when an optical disc is irradiated from a laser beam having an irradiation spot having a shape according to the present invention when viewed from above.

FIG. 2 is a schematic diagram showing a spot shape and a temperature distribution when an optical disc is viewed from above when a laser beam having an irradiation spot having a shape according to the present invention is irradiated to reproduce a D-RAD-MSR; It is the schematic diagram explaining the magnetization state of each layer at this time.

FIG. 3 is a schematic diagram showing a spot shape and a temperature distribution when an optical disc is viewed from above when reproducing a FAD-MSR by irradiating a laser beam having an irradiation spot having a shape according to the present invention; 5 is a schematic diagram illustrating a magnetization state of each layer of FIG.

FIG. 4 is a schematic diagram showing a spot shape and a temperature distribution when an optical disc is viewed from above when a laser beam having a conventional shaped irradiation spot is irradiated.

FIG. 5 is a schematic diagram showing a spot shape and a temperature distribution when an optical disk is viewed from above when reproducing a D-RAD-MSR by irradiating a laser beam having an irradiation spot having a conventional shape; 5 is a schematic diagram illustrating a magnetization state of each layer of FIG.

FIG. 6 is a schematic diagram showing a spot shape and a temperature distribution when an optical disc is viewed from above when reproducing a FAD-MSR by irradiating a laser beam having an irradiation spot of a conventional shape, and each layer at this time. 5 is a schematic diagram for explaining a magnetization state of FIG.

[Explanation of symbols]

1... Irradiation spot of laser light 2... Track on optical disk 3... High temperature area 4... Area sandwiched between high temperature area and low temperature area 5.・ Low-temperature area 6 ・ ・ ・ ・ ・ ・ ・ Recording mark reproduced in the area between the high-temperature area and the low-temperature area

Claims (6)

[Claims] 1. A recording and reproducing method for a magneto-optical recording medium having a memory layer and performing recording and reproduction by irradiating light to a magneto-optical recording medium having concentric or spiral tracks, the method comprising: The recording and reproducing method for a magneto-optical recording medium, characterized in that the irradiation spot of the irradiation light, which is formed at the time of recording and reproduction, is longer in the longitudinal direction of the track than in the width direction of the track. . 2. A reproducing layer composed of a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate, and formed on the reproducing layer, exhibiting an in-plane magnetization state at room temperature, and being irradiated with the reproducing light at the time of reproduction. Then, it has a reproducing intermediate layer exhibiting a perpendicular magnetization state, and a memory layer formed on the reproducing intermediate layer and exhibiting a perpendicular magnetization state, and the Curie temperature of the reproducing intermediate layer is such that the reproducing intermediate layer is shifted from the in-plane magnetization state. In the recording and reproducing method of a magneto-optical recording medium capable of performing magnetic super-resolution reproduction at a temperature equal to or higher than the temperature at which the medium changes to a perpendicular magnetization state, the recording spot formed on the medium, the irradiation spot of irradiation light irradiated at the time of reproduction, A recording / reproducing method for a magneto-optical recording medium, wherein a dimension in a longitudinal direction of the track is longer than a dimension in a width direction of the track. 3. A reproducing layer comprising a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate, and a reproducing layer formed on the reproducing layer, exhibiting an in-plane magnetization state at room temperature, and being irradiated with the reproducing light at the time of reproduction. Then, a reproducing intermediate layer exhibiting a perpendicular magnetization state, and cutting formed on the intermediate reproducing layer, exhibiting a perpendicular magnetization state, and having a Curie temperature equal to or higher than a temperature at which the reproducing intermediate layer changes from an in-plane magnetization state to a perpendicular magnetization state. A layer, formed on the cutting layer, having a Curie temperature higher than the Curie temperature of the cutting layer,
In a recording and reproducing method of a magneto-optical recording medium capable of reproducing magnetic super-resolution having a memory layer exhibiting a perpendicular magnetization state,
A recording spot on the magneto-optical recording medium, wherein an irradiation spot of the irradiation light, which is formed on the medium during the recording and reproduction, is longer in a longitudinal direction of the track than in a width direction of the track. , How to play. 4. A reproducing layer comprising a magneto-optical film exhibiting a perpendicular magnetization state on a disk-shaped substrate; a reproducing intermediate layer formed on the reproducing layer and exhibiting a perpendicular magnetization state at room temperature; Having a memory layer formed thereon and exhibiting a perpendicular magnetization state, and recording of a magneto-optical recording medium capable of reproducing magnetic super-resolution,
In the reproducing method, the recording formed on the medium,
A recording / reproducing method for a magneto-optical recording medium, wherein an irradiation spot of irradiation light irradiated at the time of reproduction has a dimension in a longitudinal direction of the track longer than a dimension in a width direction of the track. 5. A recording layer comprising a magnetic material having a compensation temperature between room temperature and the Curie temperature on the memory layer and having a Curie temperature higher than the Curie point of the memory layer; In the recording and reproducing method of a magneto-optical recording medium having an optical modulation overwrite function having an initialization layer made of a magnetic material exhibiting a perpendicular magnetization state at room temperature, the recording and reproduction are performed on the medium. The magnetic super-resolution reproducing method according to claim 1, wherein an irradiation spot of the irradiation light to be applied has a dimension in a longitudinal direction of the track longer than a dimension in a width direction of the track. Recording and reproducing method for magneto-optical recording medium. 6. An intermediate layer made of a magnetic material exhibiting a predominant magnetization state of a rare earth metal at room temperature on said memory layer, and a compensation temperature formed between said intermediate layer and room temperature and Curie temperature. A recording layer composed of a magnetic layer having a Curie temperature higher than the Curie point of the memory layer, a switch layer composed of a magnetic layer formed on the recording layer, and a perpendicular magnetization formed on the switch layer at room temperature. In the recording and reproducing method of a magneto-optical recording medium having a light modulation overwrite function having an initialization layer made of a magnetic material exhibiting a state, the recording spot formed on the medium, the irradiation spot of irradiation light irradiated at the time of reproduction is 5. The magneto-optical recording medium according to claim 1, wherein the length of the track in the longitudinal direction is longer than the width of the track. Method.