CN1963927B - A blue magnetic optical disk - Google Patents
A blue magnetic optical disk Download PDFInfo
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- CN1963927B CN1963927B CN2006101187063A CN200610118706A CN1963927B CN 1963927 B CN1963927 B CN 1963927B CN 2006101187063 A CN2006101187063 A CN 2006101187063A CN 200610118706 A CN200610118706 A CN 200610118706A CN 1963927 B CN1963927 B CN 1963927B
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Abstract
This invention discloses one blue light magnetic disc, which comprises underlay, first SiN media layer, TbFeCo record layer, second SiN media layer and A1 reflection layer. The invention is characterized by the following: the said record layer and second SiN media layer set with one layer of thermal control film. This invention coats one layer of metal film tightly to record layer as heat transmission layer to control over high temperature of record layer to improve the read valve efficiency and to improve signal to noise proportion.
Description
Technical field
The present invention relates to a kind of CD of information stores, more particularly relate to a kind of blue-ray magnetic optical disk of reading threshold power, raising signal to noise ratio (S/N ratio) of magneto-optic disk under blue light that improve.
Background technology
Along with the continuous increase of magneto-optic memory capacity, become the inexorable trend of magneto-optic disk development of future generation with short wavelength laser (blue light) as writing down and read light source, therefore require storage medium bigger Kerr effect to be arranged at the blue light place.Materials such as MnBi, Pt-Co, garnet oxide have bigger kerr rotational angle when the short wavelength, be the candidate material of magnetic-optical storage medium of new generation, but the practicability of these several media also has a lot of problems to be difficult to solve.Rare-earth transiting group metal (TbFeCo) film is the magnetic-optical storage medium of present practicability, noncrystalline membrane can produce a low noise interface, can in very large range regulate by composition its magnetic and magneto-optical property are cut out arbitrarily, therefore storing particularly at magneto-optic has irreplaceable effect in the storage of multilayer coupled film magneto-optic.But, TbFeCo alloy firm Ke Er angle reduces along with the reduction of reading wavelength, when reading laser and shift to blue light, the carrier-to-noise ratio of magneto-optic disk will descend, if still with the medium of TbFeCo as the blue-ray magnetic optical disk storage, just must acquire higher carrier-to-noise ratio to the improvement and the optimal design of traditional magneto-optic disk structure.Read under the blue light Ke Er angle reduce signal level and noise level are reduced, when scattered noise during greater than disk noise, reading carrier-to-noise ratio will descend; Read laser power and can make carrier-to-noise ratio maintain original level and increase.But the increase of reading laser power can cause that temperature is too high in the focal beam spot, and Kerr effect is further reduced, and how to make the key of the too high TbFeCo of the being blue-ray magnetic optical disk optimal design that the recording layer temperature do not rise under more powerful focusing blue light action.
Summary of the invention
Technical matters to be solved by this invention is to improve the structure of blue-ray magnetic optical disk, improves magneto-optic disk and read threshold power under blue light, thereby improve the signal to noise ratio (S/N ratio) of blue-ray magnetic optical disk.
The technical solution used in the present invention: a kind of blue-ray magnetic optical disk, comprise substrate layer, a SiN dielectric layer, TbFeCo recording layer, the 2nd SiN dielectric layer and Al reflection horizon,, it is characterized in that: be equipped with an Al rete as layer of thermal control between described TbFeCo recording layer and described the 2nd SiN dielectric layer.
The thickness of described first, second SiN dielectric layer is according to optical signature matrix method coupling optimum value, and making film is reflectivity＞20%.
Thickness＞the 0nm of described Al film layer of thermal control,＜10nm.
Described TbFeCo recording layer is the alloy firm based on rare earth metal, and its compensation temperature is greater than room temperature.
The film of described each functional layer all adopts the magnetron sputtering method preparation to form.
Beneficial effect of the present invention: the present invention is being close to recording layer place plating layer of metal layer as heat conduction layer, and like this can controlling recording layer temperature too increase read threshold power thereby improve magneto-optic disk under blue light, improve signal to noise ratio (S/N ratio).The Al film has good heat conductivity, can satisfy the requirement of rapid conduction TbFeCo layer heat, and simultaneously, the Al film is again the reflector material of traditional magneto-optic disk, when sputter prepares can with the same target of reflection horizon film, saving cost.Therefore, the present invention has improved the structure of blue-ray magnetic optical disk with the layer of thermal control material of Al film as blue-ray magnetic optical disk, improves magneto-optic disk and read threshold power under blue light, thereby improve the signal to noise ratio (S/N ratio) of blue-ray magnetic optical disk.
Description of drawings
Fig. 1 a is traditional magneto-optic disk film layer structure synoptic diagram;
Fig. 1 b is the film layer structure synoptic diagram of this patent blue-ray magnetic optical disk;
Fig. 2 is the maximum temperature comparison diagram of recording layer in difference time tradition magneto-optic disk of reading laser power and the magneto-optic disk of the present invention;
Fig. 3 is the radial distribution curve map of laser power recording layer film body temperature when being 2.5mW;
Fig. 4 is laser power film body temperature scatter chart in time during different layer of thermal control thickness when being 2mW;
Fig. 5 is a focal beam spot Ke Er loop testing device synoptic diagram;
Fig. 6 is that the utmost point of the laser power five layer film structures that measured traditional four-level membrane structure and the present invention five increase layer of thermal control when being 3mW is to Ke Er loop line figure.
Embodiment
Below by accompanying drawing the present invention is described in further detail, a kind of blue-ray magnetic optical disk, comprise substrate layer, a SiN dielectric layer, TbFeCo recording layer, the 2nd SiN dielectric layer and Al reflection horizon, it is characterized in that: be equipped with an Al rete as layer of thermal control between described TbFeCo recording layer and described the 2nd SiN dielectric layer.The thickness of described first, second SiN dielectric layer is according to optical signature matrix method coupling optimum value, and making film is reflectivity＞20%, is that quality factor has maximal value thereby make whole film.Thickness＞the 0nm of described Al film layer of thermal control,＜10nm.Described TbFeCo recording layer is the alloy firm based on rare earth metal, and its compensation temperature is greater than room temperature.The film of described each functional layer all adopts the magnetron sputtering method preparation to form.
At the blue-ray magnetic optical disk structure of the present invention shown in Fig. 1 b, at first to determine the thickness of each rete.According to the be optimized design of optical signature matrix to film system, it is as follows to obtain one group of thicknesses of layers: the first dielectric layer 30nm, recording layer 25nm, layer of thermal control 10nm, the second dielectric layer 50nm, reflection horizon 100nm.This moment, the Ke Er angle of film system was 0.7255 degree, and reflectivity is 20.29%.Optical maser wavelength is got 410nm during optimal design, i.e. the wavelength of blue light.Except that layer of thermal control, traditional magneto-optic disk shown in Fig. 1 a has identical film thickness parameter with blue-ray magnetic optical disk of the present invention, and this moment is the thermal property of these two kinds of magneto-optic disk structures relatively.The maximum temperature of recording layer when Fig. 2 reads laser power for difference, maximum temperature is the temperature of laser facula center.Can find that when reading laser power when being 2mW, the temperature of recording layer is than low 80 ℃ of traditional structure in the new construction magneto-optic disk; When laser power is 5mW, low 202 ℃.When reading laser power when being 2.5mW, the maximum temperature of magnetooptical layer just reaches 212 ℃, and the Curie temperature of TbFeCo film is 190 ℃, and also promptly to traditional four-layer structure, when reading laser power when being 2.5mW, recorded information promptly is wiped free of.And to having added the five-layer structure (b) of a layer of thermal control (10nm), when read-out power was 4mW, the maximum temperature of magnetooptical layer only was 170 ℃, so read-out power can increase to 4mW.Read threshold power and improve more by adjusting the thickness of heat conduction layer, can also making.The radial distribution curve of recording layer film body temperature when Fig. 3 is 2.5mW for laser power.As seen from Figure 3, along with the increase of radius r, the film body temperature evenly reduces, and the temperature of spot center place film is the highest, and radially, along with away from laser facula, recording layer film body temperature evenly descends.We have calculated the radial temperature profile of traditional four-layer structure magneto-optic disk when different reflector thickness, find when reflector thickness when 100nm is increased to 200nm, the film body central temperature has only reduced by 40 ℃.And for having added-five-layer structure of 10nm layer of thermal control, be that the spot center temperature has reduced by 100 ℃, illustrate that layer of thermal control has the better controlled effect for the rising of medium temperature in the focal beam spot under 100nm and the same laser power at reflector thickness.Film body temperature distribution curve in time during different layer of thermal control thickness when Fig. 4 is 2mW for laser power, laser pulse width 60ns wherein, rising edge and negative edge are 12ns.As seen, the recording layer maximum temperature begins to descend when laser power decline place (t=48ns).Under pulsed laser action, when layer of thermal control thickness is 10nm, when having layer of thermal control, film body center maximum temperature ratio do not hang down 80 ℃; Increase with layer of thermal control thickness, temperature reduces amplitude and also increases, and when layer of thermal control thickness was 20nm, temperature reduced by 90 ℃.Press molecular field theory, reading the Ke Er angle should be big more, thereby it is big more to read quality factor, and higher signal to noise ratio (S/N ratio) should be arranged.Relatively the temperature-time distribution curve of four layers of tradition and improved five-layer structure as seen, the speed that five-layer structure magneto-optic disk temperature rises and descends is more faster than four-layer structure, the five-layer structure magneto-optic disk reaches maximum temperature when laser action 12ns, and traditional four-layer structure just reaches the highest equilibrium temperature gradually when the laser action time is 21ns, this has reflected that five-layer structure has better thermal response characteristics, writes sensitivity and wants high.
Four layers of film sample with five-layer structure prepare with the SPF-430H magnetic control sputtering system.The film thickness of each rete is with embodiment 1.The sputtering system final vacuum can reach 7 * 10
-5Pa, with Ar gas as sputter gas, N
2As SiN reactive sputtering gas, sputtering power is 400kV, and sputtering pressure is 2Pa.Backing material glass, it is of a size of Φ 2cm. for the film sample of four layers of sputter preparations and five-layer structure focal beam spot Kerr effect proving installation, has investigated its temperature effect as shown in Figure 5, and laser is from substrate layer incident during measurement.Because Tb
22(Fe
85Co
15)
78The compensation temperature of film is less than room temperature, and therefore, when laser radiation, the temperature of film raises, and its coercive force can reduce.When asymptotic Curie temperature, coercive force is near 0.The utmost point of tradition four-layer structure film and novel five-layer structure film was to the Ke Er loop line when Fig. 6 was 3mW for laser power.Shown in Fig. 6 a, when laser power was 3mW, the utmost point Ke Er loop line of traditional four-layer structure film was near straight line, and coercive force and remanent magnetism are 0, illustrated that this moment, film temperature reached the Curie temperature of TbFeCo film, also was that recorded information is wiped free of.And for the novel five layer film structures of being with the 10nmAl layer of thermal control, it is rectangular that its utmost point of Fig. 6 b Ke Er loop line is still, and coercive force is 2*10
5A/m, illustrate film this moment to read performance still fine.This loop line is to repaint according to the X-Y recorder measured result, and coordinate is free unit.Angle of Ke Er loop line inclination is because do not deduct the remanent magnetism of glass.This experiment has proved the regulating action of layer of thermal control for the recording layer temperature well.Optics of the present invention, calorifics calculate the parameter list of institute's foundation.
Table 1
| Material | Refractive index (n) | Thermal capacitance C (J/ (cm 3·deg)) | Thermal conductivity K (W/ (cmdegs)) |
| Substrate | 1.58 | 1.512 | 0.0019 |
| SiN | 2.0 | 1.924 | 0.015 |
| TbFeCo | 2.10-2.95i | 3.12 | 0.12 |
| Al | 0.45-3.61i | 2.7 | 2.4 |
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (5)
1. a blue-ray magnetic optical disk comprises substrate layer, a SiN dielectric layer, TbFeCo recording layer, the 2nd SiN dielectric layer and Al reflection horizon, it is characterized in that: be equipped with an Al rete as layer of thermal control between described TbFeCo recording layer and described the 2nd SiN dielectric layer.
2. blue-ray magnetic optical disk according to claim 1 is characterized in that: the thickness of described first, second SiN dielectric layer, making film is reflectivity＞20%.
3. blue-ray magnetic optical disk according to claim 1 is characterized in that: the thickness＞0nm of described Al film layer of thermal control,＜10nm.
4. blue-ray magnetic optical disk according to claim 1 is characterized in that: described TbFeCo recording layer is the alloy firm based on rare earth metal, and its compensation temperature is greater than room temperature.
5. blue-ray magnetic optical disk according to claim 1 is characterized in that: the film of described each functional layer all adopts the magnetron sputtering method preparation to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101187063A CN1963927B (en) | 2006-11-23 | 2006-11-23 | A blue magnetic optical disk |
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|---|---|---|---|
| CN2006101187063A CN1963927B (en) | 2006-11-23 | 2006-11-23 | A blue magnetic optical disk |
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| CN1963927A CN1963927A (en) | 2007-05-16 |
| CN1963927B true CN1963927B (en) | 2010-09-15 |
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| CN2006101187063A Expired - Fee Related CN1963927B (en) | 2006-11-23 | 2006-11-23 | A blue magnetic optical disk |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101256353B (en) * | 2008-03-28 | 2010-12-08 | 中国科学院上海光学精密机械研究所 | Probe-induced photoetching film and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430422A2 (en) * | 1989-12-01 | 1991-06-05 | Pioneer Electronic Corporation | Magneto-optical recording disk |
| CN1543645A (en) * | 2001-06-29 | 2004-11-03 | 索尼株式会社 | Sagneto-optical recording medium and its production method |
| CN1677523A (en) * | 2004-03-31 | 2005-10-05 | 铼德科技股份有限公司 | Film structure of increasing duplication life of optical recording medium |
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2006
- 2006-11-23 CN CN2006101187063A patent/CN1963927B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0430422A2 (en) * | 1989-12-01 | 1991-06-05 | Pioneer Electronic Corporation | Magneto-optical recording disk |
| US5087340A (en) * | 1989-12-01 | 1992-02-11 | Pioneer Electronic Corporation | Method of making magneto-optical recording disk |
| CN1543645A (en) * | 2001-06-29 | 2004-11-03 | 索尼株式会社 | Sagneto-optical recording medium and its production method |
| CN1677523A (en) * | 2004-03-31 | 2005-10-05 | 铼德科技股份有限公司 | Film structure of increasing duplication life of optical recording medium |
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