JP3475263B2 - Information recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION, EmotionInformation recording mediumOn the bodySeki
I do. [0002] 2. Description of the Related Art There are various types of recording devices for computers.
An apparatus using such a magnetic recording medium is used.
In particular, magnetic disk devices represented by hard disks and
And magneto-optical disk drives are becoming more widely used
ing. In preparation for the coming multimedia age, video data
To record a huge amount of data like data,
The amount needs to be further increased. To increase recording density
For this purpose, it is necessary to form more recording marks on the medium.
It is necessary to shorten the mark length and
The track spacing, and the track spacing.
Must. [0003] As described above, the recording density
Length, mark spacing or track spacing to increase
The effect of heat during recording on magnetic disks
Causes magnetic fluctuations, and the boundary between adjacent tracks is
Question that clear and uniform recording marks cannot be formed
There was a title. Also, grooves are formed on the substrate for magneto-optical disks.
Thus, a recording track is formed. Writing information
By making the magneto-optical head follow the groove during recording and playback
Although tracking servo is performed, it is necessary to
Due to legal limitations, reduced track spacing produces boards
There was a problem that was difficult. [0004] A tracking circuit for a magneto-optical disk is also provided.
Into a guide track with a different crystalline state of the recording layer
Magneto-optical storage element is described in Japanese Patent No. 1647427
Proposed. This makes it possible to form a groove without forming a groove.
Racking servo can be performed. But
Crystallization of the recording layer by heating
Record a magnetic film that easily crystallizes to form a rack
When used in a layer, the recording characteristics are insufficient,
It is difficult to crystallize using a good magnetic film.
There was a title. [0005] The present invention has been made in view of such circumstances.
And the first and second magnetic layers have different magnetic anisotropies.
And by providing the second control region, the first magnetic layer
A recording area and a guide area are formed.
When magnetic recording is performed by internal magnetization,
Magnetically clear the fieldLoveProviding information recording media
With the goal. [0006] Means for Solving the Problems Information recording according to the first invention
The medium has a first magnetic layer for recording and holding information.as well asThe first
Magnetic layerExchange coupling with the first magnetic layerControl the magnetic properties of
Second magnetismLayersInformation recording media stackedSohand,
The second magnetic layer is, Formed by rare earth-transition metal alloy
In a plane having a magnetization direction parallel to the stacking planeTerritory
AndPerpendicular with magnetization direction perpendicular to stacking planeReserve area
The first magnetic layer includes:Formed by CoCr alloy
And exchange-coupled with the in-plane region,
Have a directionRecording area andExchange coupled with the vertical area
Has a magnetization direction perpendicular to the stacking planeProvide guide area
It is characterized by In the first invention, an example of the second magnetic layer
For example, by crystallizing the first control region, the first control region
Of magnetic anisotropy between the first region and the second control regionToStrangeLet
You. A first magnetic layer that is exchangeably coupled with the second magnetic layer;
Each of the magnetic layerscontrolTransfer the magnetization direction of the area to the recording area
An area and a guide area are formed. Therefore, the first magnetic
The direction of magnetic anisotropy is different between the recording area of the layer and the guide area.
AndHas a magnetization direction parallel to the stacking planeRecord area
AreaAffectionRecord informationTo doIs formed between the recording areas
Magnetically clarified boundaries between recording areas by using guide areas
it can. [0008] [0009] [0010] [0011] [0012] [0013] [0014] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to its embodiments.
This will be specifically described based on the drawings shown. Embodiment 1 FIG. FIG. 1 shows an information storage device according to the first embodiment of the present invention.
FIG. 2 is a partially broken perspective view showing a film structure of a recording medium, showing a magnetization state.
Are shown together. In the figure, reference numeral 1 denotes a disk according to the first embodiment.
An information recording medium in the form of an aluminum substrate 11
Above, Tb_{twenty one}(Fe₉₀Co_Ten) ₇₉25nm thick
The second magnetic layer (control layer) 12 of Co._75.5Cr_{Fifteen
.Five}Pt_5.0Ta_4.5The first of 25 nm thick
A magnetic layer (recording layer) 13 is laminated. To the recording layer 13
Is a recording track that is approximately concentric with the center of the disc as the center.
Are formed, and the recording track 1
Guide tracks 13b, 13b ... are between 3a, 13a ...
Is formed. The control layer 12 has a recording track of the recording layer 13.
13a, 13a... In the control area.
Some in-plane areas 12a, 12a,.
Of the layer 13 corresponding to the guide tracks 13b, 13b,.
, Which are the control areas,
Is formed. The in-plane regions 12a, 12a,.
This is a region where the perpendicular magnetization component has disappeared by light irradiation. Hanging
Each of the straight regions 12b has a perpendicular magnetization direction.
The regions 12a have an in-plane magnetization direction. The recording layer 13 and the control layer 12 are exchanged.
The resultant force is acting, and the in-plane regions 12a,
The recording tracks 13a, 13a,.
It has anisotropy. Also, the vertical regions 12b, 12b.
The upper guide tracks 13b, 13b...
It has more perpendicular magnetic anisotropy. In FIG. 1,
The in-plane area 12a and the recording track 13a have the same axial width.
Although the case of forming is explained,
May be. Similarly, the vertical area 12b and the guide track
The shaft 13b may be formed with a different shaft width. The information recording medium 1 having such a configuration is manufactured.
The procedure will be described below. FIG. 2 shows an information recording medium 1
FIG. 4 is a cross-sectional view at a manufacturing stage. As shown in FIG.
As described above, the control layer 12 is formed on the substrate 11 in the chamber.
You. The control layer 12 is made of TbFeCo as described above.
Rare earth-transition metal alloy film. As shown in FIG.
After forming the protective film 17 on the control layer 12,
The laser beam is carried out from the cover and irradiated with laser light from the protective film 17 side.
The control layer 12 is a perpendicular magnetization film after the film formation,
Perpendicular magnetization in the region above the crystallization temperature due to irradiation
The components disappear and the in-plane region 12a is formed. Laser light
Is not irradiated with the vertical region 12b of the perpendicular magnetization film.
It is. The protective film 17 formed at this time is the control film 12
Is protected from direct laser light irradiation. Next, as shown in FIG.
The protective film 17 of the information recording medium carried into the inside is removed and the control is performed.
The recording layer 13 is formed on the layer 12. The recording layer 13 is directly formed
The rest is the in-plane magnetization film, but the exchange coupling force with the control layer 12
As shown in FIG. 2D, the gas on the vertical region 12b is
The id track 13b indicates the perpendicular magnetization direction, and the in-plane region 1
The recording track 13a on 2a is the as-deposition of the recording film.
3 shows the magnetization state of the component, that is, the in-plane magnetization direction. In forming the in-plane region 12a, the laser
The laser light is applied from the side opposite to the substrate 11. This
Even if the substrate 11 is made of aluminum, it is affected by heat.
I can't. The information recording medium 1 manufactured as described above is
When used as a magnetic disk, normal magnetic recording and playback
Recording and reproduction of information can be performed using the device. Figure
Reference numeral 3 denotes a configuration of a normal magnetic recording / reproducing magnetic head device.
FIG. As shown in FIG.
The recording of the information recording medium 1 is performed by the magnetic head 14 having
It is arranged on the layer 13 side. The magnetic head 14 has an arm 15
Information is recorded by the rotation of the arm 15.
The medium 1 can be moved in the radial direction. Recording information
At times, the magnetic head 14 is
Upon receiving the control signal, a magnetic field corresponding to the information is recorded on the information recording medium.
Apply to 1. The information recording medium 1 as described above has a recording layer 13
Of the recording tracks 13a, 13a,.
Are recorded, and the guide tracks 13b, 13b.
Direction, the recording tracks 13a, 1
The magnetic fluctuation between 3a ... is eliminated. This allows you to track
The boundary between the magnetic fields becomes magnetically clear, and an accurate reproduced signal is obtained.
Can be Embodiment 2 FIG. FIG. 4 shows an embodiment of the present invention.
FIG. 4 is a partially cutaway perspective view showing the film structure of the information recording medium of state 2.
The graph also shows the magnetization state. 2 in the figure is an embodiment.
2 is a disc-shaped information recording medium made of synthetic resin.
Tb on the substrate 21_{twenty one}(Fe₉₀Co_Ten)₇₉Thickness of
25 nm of the second magnetic layer (control layer) 22 and Tb_{twenty two}
(Fe₈₀Co ₂₀)₇₈The first 30 nm thick
A magnetic layer (recording layer) 23 is laminated. For the control layer 22
The control is performed substantially concentrically around the center of the disk.
Are formed as vertical regions 22a.
Between the vertical regions 22a, 22a,.
The in-plane regions 22b are formed. In-plane area
22b, 22b,.
This is the area where the minute has disappeared. The vertical regions 22a, 22a ...
Have a perpendicular magnetization direction, and the in-plane regions 22b, 22b,.
It has a magnetization direction. The recording layer 23 includes a vertical area 2 of the control layer 22.
The recording tracks 23a, 22a, 22a,.
23a are formed, and the in-plane region 22 of the control layer 22 is formed.
The guide tracks 23b, 22b,.
23b are formed. Recording layer 23 and control layer 22
Exchange coupling force is acting between the
Inner areas 22b, 22b... Lower guide tracks 23b, 2
3b have in-plane magnetic anisotropy. Also the vertical area
22a, 22a ... lower recording tracks 23a, 23a ...
Have perpendicular magnetic anisotropy due to exchange coupling force. What
In FIG. 4, the in-plane area 22b and the guide track 23
b describes the case where the shaft width is formed to be the same width.
It may be formed with a different axial width. Similarly, the vertical region 22
a and the recording track 23a are formed with different shaft widths.
May be. The information recording medium 1 having such a configuration is manufactured.
The procedure will be described below. FIG. 5 shows the information recording medium 1
FIG. 4 is a cross-sectional view at a manufacturing stage. As shown in FIG.
As described above, the recording layer 23 is formed on the substrate 21 in the chamber.
Then, the control layer 22 is formed. Recording layer 23 and control
The layer 22 is made of a rare-earth element composed of TbFeCo as described above.
-A transition metal alloy film. As shown in FIG.
A laser beam is irradiated from the control layer 22 side. Control layer 22 is formed
After that, the perpendicular magnetization film is crystallized by laser light irradiation.
The perpendicular magnetization component disappears in the region higher than the temperature,
An inner region 22b is formed. Laser light is not being irradiated
The vertical region is a vertical region 22a of the perpendicular magnetization film. Next, the recording layer 23 is a perpendicular magnetization film immediately after being formed.
However, as shown in FIG.
The recording track 23a under the vertical area 22a is generated by the exchange coupling force.
Indicates the perpendicular magnetization direction, and the guide trajectory below the in-plane region 22b.
A magnetic recording state of the as-deposition of the recording film;
That is, the vertical magnetization direction is shown. The information recording medium 2 manufactured as described above is
When used as a magnetic disk, normal magneto-optical recording
Information can be recorded and reproduced using a reproduction device.
You. FIG. 6 shows a magneto-optical head device for normal magnetic recording and reproduction.
It is a top view which shows the structure of. As shown in FIG.
Optical head having a lens 25 and a laser light source (not shown).
The information recording medium 2 is disposed on the substrate 21 side of the information recording medium 2.
The optical head 24 is attached to a voice coil motor 26.
Current is supplied to the voice coil motor 26,
The information recording medium 2 can be moved in the radial direction. Recording information
Sometimes, the optical head 24 responds to information from the substrate 21 side.
And irradiate it with a laser beam.
The light is irradiated from the substrate 21 side. [0027] Embodiment 3 FIG. 7 shows the information of the third embodiment.
FIG. 3 is a cross-sectional view of the information recording medium in a manufacturing stage, showing a magnetization state.
Are shown together. As shown in FIG.
Tb on the synthetic resin substrate 21_{twenty one}(Fe₉₀C
o_Ten)₇₉Of control layer 22 having a thickness of 25 nm made of
Followed by Tb_{twenty two}(Fe₈₀Co₂₀)₇₈30 nm consisting of
The recording layer 23 having a thickness of is formed. Recording layer 23 and control layer
22 is a rare earth-transition metal alloy film. Embodiment 2 and
Is the position of the recording layer 23 and the control layer 22 with respect to the substrate 21
Are different. As shown in FIG.
Irradiation is performed from the substrate 21 side. After the control layer 22 is formed,
Is a crystalline film, but the laser light
The perpendicular magnetization component disappears in the raised region, and the in-plane region 22
b is formed. Areas not irradiated with laser light are vertical
This is the vertical region 22a of the perpendicular magnetization film. Next, the recording layer 23 is a perpendicular magnetization film immediately after being formed.
However, as shown in FIG.
The recording track 23a on the vertical area 22a is generated by the exchange coupling force.
Indicates the perpendicular magnetization direction, and the guide track on the in-plane region 22b.
A magnetic recording state of the as-deposition of the recording film;
That is, the vertical magnetization direction is shown. The information recording medium manufactured as described above is
When used as a disc,
Information is recorded and reproduced using a conventional magneto-optical recording and reproducing device.
I can. When recording and reproducing information, laser light is
Irradiation is performed from the recording layer 23 side of the information recording medium. As above
The information recording medium includes the recording tracks 23a, 23a of the recording layer 23.
Information is recorded in the perpendicular magnetization direction on 3a.
Since 23b, 23b... Indicate in-plane magnetization directions,
The reflected light from the guide tracks 23b, 23b ...
By doing so, tracking servo can be performed.
Wear. This eliminates the need to form grooves in the substrate.
As a result, the track interval can be reduced. Embodiment 4 FIG. FIG. 8 shows the information of the fourth embodiment.
FIG. 3 is a cross-sectional view of the information recording medium in a manufacturing stage, showing a magnetization state.
Are shown together. As shown in FIG.
Co on the aluminum substrate 11 inside_75.5Cr_15.0
Pt_5.0Ta_4.525 nm thick recording layer 13 made of
And then Tb_{twenty two}(Fe₈₀Co₂₀)₇₈Consisting of 3
The control layer 12 having a thickness of 0 nm is formed. The control layer 22 is a rare
An earth-transition metal alloy film. Embodiment 1 refers to a substrate
Position of recording layer 13 and control layer 12 with respect to 11
ing. As shown in FIG. 8B, the laser light is applied to the control layer 1.
Irradiate from two sides. The control layer 12 is a perpendicular magnetization film after being formed.
However, the laser light irradiation makes it higher than the crystallization temperature.
The perpendicular magnetization component disappears in the region where
Is done. Perpendicular magnetization in areas not irradiated with laser light
This is the vertical region 12b of the film. Next, the recording layer 13 is an in-plane magnetized film immediately after being formed.
However, as shown in FIG.
Guide track 13 below vertical area 12b due to the exchange coupling force
b indicates the perpendicular magnetization direction, and the recording track under the in-plane area 12a.
A magnetic state of the as-deposition of the recording film;
That is, it shows the in-plane magnetization direction. Manufactured in this way
When using the information recording medium as a magnetic disk,
Using a normal magnetic recording / reproducing device as shown in FIG.
Recording and reproduction can be performed. The information recording medium as described above has a recording layer 13
Information is recorded on the recording tracks 13a, 13a,.
Recorded, and the guide tracks 13b, 13b.
Direction, the adjacent recording tracks 13a, 13a
The magnetic fluctuation between a ... is eliminated. This allows trucks
The boundary between them becomes magnetically clear, and an accurate reproduction signal is obtained.
be able to. The first embodiment and the embodiment described above
When the information recording medium according to aspect 4 is used as a magneto-optical disk
Indicates that the region having in-plane magnetic anisotropy of the recording layer 13 is a guide.
It becomes a track and has perpendicular magnetic anisotropy of the recording layer 13
The area becomes a recording track. Guide track during playback
Is used for the tracking servo. Also, in the first embodiment,
The information recording medium is used as a magneto-optical disk, and the substrate 11 is
When made of synthetic resin or glass, as shown in FIG.
The control layer by irradiating laser light from the substrate side.
An in-plane region may be formed. Further, the information of the second and third embodiments is described.
When the information recording medium is used as a magnetic disk, the recording layer
23 regions having perpendicular magnetic anisotropy correspond to guide tracks.
The area having in-plane magnetic anisotropy of the recording layer 23 is recorded.
Become a truck. This reduces the recording track interval
Guide tracks to reduce magnetic fluctuations
By eliminating them, the boundaries between tracks can be clarified. Also implemented
Using the information recording medium of Embodiment 3 as a magnetic disk,
When the plate 11 is made of aluminum, as shown in FIG.
Irradiate laser light from the control layer side after forming the control layer
By forming a recording layer thereon, the control layer is
An inner region may be formed. Further, the information recording medium of the above-described embodiment
The body describes the case where the control layer and the recording layer are provided on the substrate.
However, the film configuration is not limited to this. 9 to 15
It is sectional drawing which shows the film | membrane structure of each other information recording medium. Figure
9 is a first protective layer 3 formed of a dielectric on a substrate 31.
4, information recording medium in which control layer 32 and recording layer 33 are laminated
It is. FIG. 10 shows a control layer 32 and a recording layer 3 on a substrate 31.
3 and an information recording medium in which the first protective layer 34 is laminated.
You. FIG. 11 shows a first protective layer 34 and a control layer
32, a recording layer 33 and a second protective layer formed of a dielectric
35 is an information recording medium in which 35 are stacked. FIG. 12 shows the first control on the substrate 31.
Layer 32, second control layer 36 formed of dielectric and recording
This is an information recording medium in which a layer 33 is laminated. First control layer 3
2 is a magnetic field in which the in-plane region and the vertical region according to the present invention are formed.
The first control layer 32 by the second control layer 36.
And the recording layer 33 are magnetostatically coupled. FIG.
1, a protective layer 34, a first control layer 32, a second control layer
36 is an information recording medium in which a recording layer 36 and a recording layer 33 are stacked. Figure
Reference numeral 14 denotes a first control layer 32 and a second control layer
Layer 36, recording layer 33 and first protective layer 34
It is an information recording medium. FIG. 15 shows a first protection
Protective layer 34, control layer 32, second control layer 36, recording layer 33
And an information recording medium in which a second protective layer 35 is laminated. The information recording medium shown in FIGS.
The magnetization states of the layer 33 and the first control layer 32 are the same as those described above.
And similar effects are obtained. Also,
In this configuration, the first control layer 32 and the recording layer 33 are interchanged.
However, the same effect can be obtained. In addition, the first and second security
The protective layers 34 and 35 may be formed of a metal,
The protective layer formed on the opposite side is an organic film or a lubricating film.
You may. These magnetization states are the same as those described in the first embodiment.
As shown in FIGS. [0039] As described above, in the present invention, the recording
Magnetic layer for controlling the magnetic properties of the first magnetic layer
A second magnetic layer, wherein the second magnetic layer has magnetic anisotropy.
The first and second control areas having different directions are provided.
In the first magnetic layer, recording areas having different directions of magnetic anisotropy are provided.
An area and a guide area are formed. Therefore, the magnetic anisotropy
Magnetic recording is performed in the in-plane direction.By, Record area
Magnetic boundaries can be clearly defined. MaIn addition, two magnetic layers
The structure makes it possible to change the direction of magnetic anisotropy.
Easy crystallization and good recording characteristics
The present invention has excellent effects. Further, in the present invention, the melting point is relatively low.
When manufacturing an information recording medium using a low metal for the substrate,
Irradiating the second magnetic layer with beam light from the side opposite to the substrate
Forming first and second control regions, and then forming a second magnetic field;
Since the first magnetic layer is laminated on the layer, the substrate is affected by heat.
The present invention has excellent effects, such as no cracking.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken perspective view showing a film structure and a magnetization state of an information recording medium according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the information recording medium of Embodiment 1 in a manufacturing stage. FIG. 3 is a diagram illustrating a magnetic head for recording and reproducing information on the information recording medium according to the first embodiment; FIG. 4 is a partially broken perspective view showing a film structure and a magnetization state of an information recording medium according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view of the information recording medium of Embodiment 2 at a manufacturing stage. FIG. 6 is a diagram showing a magneto-optical head for recording and reproducing on an information recording medium according to a second embodiment. FIG. 7 is a cross-sectional view of an information recording medium according to Embodiment 3 at a manufacturing stage. FIG. 8 is a cross-sectional view of the information recording medium of Embodiment 4 at a manufacturing stage. FIG. 9 is a cross-sectional view showing a film configuration of another information recording medium of the present invention. FIG. 10 is a sectional view showing a film configuration of still another information recording medium of the present invention. FIG. 11 is a sectional view showing a film configuration of still another information recording medium of the present invention. FIG. 12 is a sectional view showing a film configuration of still another information recording medium of the present invention. FIG. 13 is a sectional view showing a film configuration of still another information recording medium of the present invention. FIG. 14 is a sectional view showing a film configuration of still another information recording medium of the present invention. FIG. 15 is a sectional view showing a film configuration of still another information recording medium of the present invention. [Description of Signs] 1, 2 Information recording media 11, 21, 31 Substrates 12, 22, 32 Control layers 13, 23, 33 Recording layers 12a, 22b In-plane areas 12b, 22a Vertical areas 13a, 23a Recording tracks (recording areas) ) 13b, 23b Guide track (guide area)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/66 G11B 11/105

Claims (1)

(57) [of Claims] [Claim 1] Information recording first holding magnetic layer and the first magnetic layer and exchange-coupled to the second to control the magnetic properties of the first magnetic layer An information recording medium having magnetic layers laminated.
And Tsu, said second magnetic layer is rare earth - formed by a transition metal alloy
And a vertical region having a magnetization direction perpendicular to the stacking surface and an in-plane region having a magnetization direction parallel to the stacking surface , wherein the first magnetic layer is formed of a CoCr-based alloy.
And exchange-coupled with the in-plane region,
Exchange-coupled with the recording area having the
An information recording medium, comprising: a guide region having a magnetization direction perpendicular to the stacking surface .