KR950004494Y1 - Optical recording medium - Google Patents
Optical recording medium Download PDFInfo
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- KR950004494Y1 KR950004494Y1 KR2019890019528U KR890019528U KR950004494Y1 KR 950004494 Y1 KR950004494 Y1 KR 950004494Y1 KR 2019890019528 U KR2019890019528 U KR 2019890019528U KR 890019528 U KR890019528 U KR 890019528U KR 950004494 Y1 KR950004494 Y1 KR 950004494Y1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2525—Magneto-optical [MO] discs
Abstract
내용 없음.No content.
Description
제1도는 일반적인 광자기 기록매체의 구조를 보인 확대도.1 is an enlarged view showing the structure of a typical magneto-optical recording medium.
제2도는 본 고안에 의한 광자기 기록매체의 일 실시예를 보인 확대도.2 is an enlarged view showing an embodiment of a magneto-optical recording medium according to the present invention.
제3도 내지 제5도는 본 고안에 의한 광자기 기록매체의 다른 실시예를 보인 확대도.3 to 5 are enlarged views showing another embodiment of the magneto-optical recording medium according to the present invention.
제6도는 동상의 작용을 보인 것으로, 외부자장 인가하에서 레이저 광에 의하여 정보가 기록되는 상태를 보인 도식도.6 is a diagram showing the action of the frostbite, a diagram showing a state in which information is recorded by the laser light under the application of an external magnetic field.
제7도 및 제8도는 본 고안에 의한 광자기 기록매체와 일반적인 광자기 기록매체를 비교한 도표로서, 제7도는 기록출력과 CNR의 관계, 제8도는 재생출력과 CNR의 관계를 각각 보인 것이다.7 and 8 are diagrams comparing the magneto-optical recording medium and the general magneto-optical recording medium according to the present invention, and FIG. 7 shows the relationship between the recording output and the CNR, and FIG. 8 shows the relationship between the reproduction output and the CNR, respectively. .
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 기판 2 : 재생층1 substrate 2 reproduction layer
3 : 기록층 4 : 보호층3: recording layer 4: protective layer
5 : 간섭층5: interference layer
본 고안은 광자기 기록매체에 관한 것으로, 특히 기판에 자기광학 효과가 큰 바륨 헥사 페라이트(Ba-hexa ferrite)의 재생층을 형성하여 재생특성을 향상시킬 수 있게 한 광자기 기록매체에 관한 것이다.The present invention relates to a magneto-optical recording medium, and more particularly, to a magneto-optical recording medium capable of improving the reproduction characteristics by forming a reproducing layer of barium hexa ferrite having a large magneto-optical effect on a substrate.
최근 들어 광의 열적효과 등을 이용하여 수직자화 박막에 정보를 기록하고, 자기 광학효과를 이용하여 정보를 판독하는 광자기 기록매체가 널리 연구개발되고 있는바, 고밀도 기록매체로 이용되고 있는 광자기 기록매체의 전형적인 일예를 첨부된 도면에 의하여 설명하면 다음과 같다.Recently, a magneto-optical recording medium for recording information on a vertical magnetized thin film using thermal effects of light and reading information using magneto-optical effects has been widely researched and developed. A typical example of a medium will be described with reference to the accompanying drawings.
제1도에 도시한 바와 같이, 기판(11)에 유전체층인 간섭층(antireflection layer)(12), 자성층인 기록층(13), 보호층(14)이 순차적으로 적층형성된 구조로서, 상기 기판(11)은 유리, 플라스틱재질로 제작되며, 상기 간섭층(12)은 기판(11)과 기록층(13)의 사이에서 접합면의 빛 반사를 최대한으로 줄이며 자기 광학효과를 증대시키기 위하여 λ/4n(λ: 레이저 파장, n : 굴절률) 두께로 제작된다.As shown in FIG. 1, an interference layer 12 as a dielectric layer, a recording layer 13 as a magnetic layer, and a protective layer 14 are sequentially stacked on the substrate 11, and the substrate ( 11) is made of glass and plastic, and the interference layer 12 is λ / 4n to reduce the light reflection of the bonding surface between the substrate 11 and the recording layer 13 to the maximum and to increase the magneto-optical effect. (λ: laser wavelength, n: refractive index).
또한, 상기 기록층(13)의 재료로는 희토류-천이금속계의 비정질 자성체로 이루어지는 박막이 사용되며, 희토류 금속으로는 Tb(테르븀), Dy(디스프로슘), Gd(가돌리늄), Sm(사마륨), Ho(홀듐) 등이 있고, 천이 금속으로는 Fe(철), Co(코발트), Cu(구리), Ni(니켈), Cr(크롬)등이 있으며, 상기 보호층(14)은 Si3N4, AℓN, SiO, SiO2의 재질로서 기록층(13)이 산화부식되는 것을 방지하는 역할을 하게 된다.In addition, as the material of the recording layer 13, a thin film made of a rare earth-transition metal-based amorphous magnetic material is used. As the rare earth metal, Tb (terbium), Dy (dysprosium), Gd (gadolinium), Sm (samarium), Ho (Holdium) and the like, the transition metals are Fe (iron), Co (cobalt), Cu (copper), Ni (nickel), Cr (chromium) and the like, the protective layer 14 is Si 3 N As a material of 4 , AlN, SiO, and SiO 2 , the recording layer 13 serves to prevent oxidation corrosion.
상기한 광자기 기록매체는 진공증착법, 스퍼터링법등의 통상적인 방법으로 제조된다.The magneto-optical recording medium is manufactured by a conventional method such as vacuum deposition method, sputtering method and the like.
이와 같은 광자기 기록매체의 정보기록은 자성박막의 큐리에(curie) 온도(Tc) 또는 보상점에서의 보자력(Hc)의 급격한 변화 특성을 이용하여 실시하게 되며, 이를 설명하면 다음과 같다.The information recording of the magneto-optical recording medium is performed by using the curie temperature (Tc) of the magnetic thin film or the sudden change of the coercive force (Hc) at the compensation point.
즉, 집속된 레이저광에 의하여 자성박막의 온도가 상승하게 되면 보자력이 감소하게 되고, 이와 동시에 외부자기장을 인가함으로써 자화의 반전형상이 일어나 비트(bit)가 형성되어 기록이 된다.That is, when the temperature of the magnetic thin film is increased by the focused laser light, the coercive force decreases, and at the same time, an inverted shape of magnetization occurs by applying an external magnetic field, whereby a bit is formed and recorded.
또한, 정보의 재생은 반전기록된 자성막에 편광된 레이저 광을 입사한 후, 반사할때 일어나는 편광면의 회전 즉, 자기광학효과의 차이를 이용하여 행하여지게 된다.In addition, the reproduction of information is performed by utilizing the rotation of the polarization plane, i.e., the difference in the magneto-optical effect, which occurs when the polarized laser light is incident on the inversely recorded magnetic film and then reflected.
통상, 정보의 재생시 필요한 레이저 출력은 기록시보다 낮다.Usually, the laser power required for reproducing information is lower than for recording.
그러나, 상기한 바와 같은 일반적인 광자기 기록매체의 희토류-천이금속 비정질 자성체 박막은 수직자기 이방성을 나타내므로 보자력이 큰 기록재로로는 적합하지만 자기 광학효과가 작아지므로 재생특성(CNR)이 충분하지 못한 단점이 있는 것이었다.However, the rare earth-transition metal amorphous magnetic thin film of the conventional magneto-optical recording medium described above exhibits vertical magnetic anisotropy, which is suitable for recording materials having a large coercive force, but the magneto-optical effect is small, and thus the reproduction characteristics (CNR) are not sufficient. There was a disadvantage.
본 고안은 상기한 바와 같은 종래의 문제점을 해소하기 위하여 안출한 것으로, 기판에 자기효과가 크고 보자력이 작은 특성을 갖는 바륨 헥사 페라이트 수직자기 이방성박의 재생층을 형성하고, 그 재생층에 희토류-천이금속계 비정질 합금의 수직자기 이방성막의 기록층을 형성하므로써 기록감도 및 기록 안정성에 기여함은 물론 재생특성을 향상시킬 수 있도록 한 것인바, 이하 본 고안을 상세히 설명하면 다음과 같다.The present invention has been devised to solve the above-described problems, and forms a reclaimed layer of barium hexaferrite vertical magnetic anisotropic foil having characteristics of high magnetic effect and low coercive force on a substrate, and rare earth- By forming the recording layer of the vertical magnetic anisotropic film of the transition metal-based amorphous alloy, it contributes to the recording sensitivity and the recording stability as well as to improve the reproduction characteristics. Hereinafter, the present invention will be described in detail.
본 고안의 광자기 기록매체는 제2도에 도시한 바와 같이, 기판(1)에 바륨 헥사 페라이트(Ba-hexa ferrite) 수직자기 이방성막으로 이루어진 재생층(2) 및 희토류-천이금속계 비정질 합금의 수직자기 이방성막으로 이루어진 기록층(3)을 적층형성한 구조로 되어 있다.The magneto-optical recording medium of the present invention, as shown in FIG. 2, includes a regeneration layer 2 and a rare earth-transition metal-based amorphous alloy made of a barium hexa ferrite vertical magnetic anisotropic film on a substrate 1. The recording layer 3 made of a perpendicular magnetic anisotropic film is laminated.
상기 기판(1)은 비자성체로서 투명한 재료, 예를 들어 글라스(glass), 플라스틱, 세라믹(ceramic) 등으로 제조되며, 상기 기록층(3)은 일반적인 희토류-천이금속계의 비정질 합금으로서, Tb-Fe, Dy-Fe, Gd-Tb-Fe-Co 등을 들 수 있으며, 그 두께는 500-5000Å가 바람직하며, 증착법, 스퍼터링, 이온 플레이팅등의 방법으로 제조할 수 있다.The substrate 1 is made of a nonmagnetic material and is made of a transparent material, for example, glass, plastic, ceramic, and the like. The recording layer 3 is a general rare earth-transition metal-based amorphous alloy, and includes Tb- Fe, Dy-Fe, Gd-Tb-Fe-Co, etc. are mentioned, The thickness is 500-5000 micrometers, and can be manufactured by methods, such as a vapor deposition method, sputtering, and ion plating.
또한, 상기 재생층(2)을 이루는 바륨 헥사 페라이트는 대표적으로 SaO. 6FeO으로 표시되고, 자기 광학효과를 더욱 증대시키기 위하여 Fe원자의 일부를 Co, Ti 등으로 치환할 수도 있다.In addition, barium hexaferrite constituting the regeneration layer 2 is representative of SaO. It is represented by 6FeO, and in order to further increase the magneto-optical effect, some Fe atoms may be replaced with Co, Ti, or the like.
이는 BaM(단, M=Fe12-2xCoxTixO19(0.5≤12-2x≤1.5)로 표시된다.This is expressed as BaM, where M = Fe 12-2x Co x Ti x O 19 (0.5≤12-2x≤1.5).
상기 재생층(2)은 바륨 헥사 페라이트의 수직자기 이방성막을 증착법, 스퍼터링법, 이온플레이팅(Ion-plating)법, 도금법등으로 제작되며, 그 두께는 500-5000Å 정도가 적당하다.The regenerated layer 2 is produced by vapor deposition, sputtering, ion-plating, plating or the like of a vertical magnetic anisotropic film of barium hexa ferrite, and its thickness is suitably about 500-5000 mm 3.
한편, 제3도 내지 제5도는 본 고안의 공자기 기록매체의 다른 실시형태를 보인 것으로, 제3도는 제2도에 도시한 바와 같은 기본적인 구조를 바탕으로 기록층(3)에 보호층(4)을 형성한 것으로, 상기 보호층(4)은 비정질 자성의 기록층(3)이 산소 또는 수분에 의하여 산화부식되는 현상을 방지하는 역할을 수행하게 되며, Si3N, SiO, SiO2, TiN, ZrO3 등의 재질로 형성되고, 그 두께는 1000-5000Å정도가 바람직하며, 증착법, 스퍼터링법, 이온 플레이팅법 등으로 제작된다.3 to 5 show another embodiment of the magnetic recording medium of the present invention, and FIG. 3 shows a protective layer 4 on the recording layer 3 based on the basic structure as shown in FIG. ), The protective layer 4 serves to prevent the amorphous magnetic recording layer 3 from being oxidized and corroded by oxygen or moisture, and Si 3 N, SiO, SiO 2 , TiN , ZrO3 and the like, and the thickness thereof is preferably about 1000-5000 kPa, and is produced by vapor deposition, sputtering, ion plating, or the like.
또한, 제4도는 제3도에 도시한 바와 같은 구조에서 기판(1)과 재생층(2)의 사이에 접합면 반사를 최대한 줄이고 자기 광학효과를 증대시키기 위하여 유전체층인 간섭층(anti-reflection)(5)을 형성한 것으로, 상기 간섭층(5)의 두께는 λ/4n(λ: 레이저 파장, n : 굴절률)이 바람직하며, 그 재질은 제3도의 보호층(4)과 같은 것을 사용할 수 있다.In addition, FIG. 4 shows an anti-reflection, which is a dielectric layer, in order to minimize the reflection of the bonding surface between the substrate 1 and the reproduction layer 2 and to increase the magnetooptic effect in the structure as shown in FIG. (5), the thickness of the interference layer (5) is preferably λ / 4n (λ: laser wavelength, n: refractive index), the material may be the same as the protective layer (4) of FIG. have.
또한, 제5도는 기판(1)에 희토류-천이금속계 비정질 합금의 수직자기 이방성박으로 이루어진 기록층(3) 및 바륨 헥사 페라이트의 수직자기 이방성막으로 이루어진 재생층(2)을 순차적으로 적층한 것으로, 이와 같은 구조는 레이저 광(ℓ)이 재생층(2)의 상측으로부터 주시될 경우에 적당한 구조이며, 상기 재생층(2)에 제3도에 도시한 바와 같은 보호층(4)과 동일재질의 보호층을 형성할 수도 있다.5 is a stacking of a recording layer 3 made of a perpendicular magnetic anisotropic foil of a rare earth-transition metal-based amorphous alloy and a reproduction layer 2 made of a vertical magnetic anisotropic film of barium hexaferrite. This structure is suitable for the case where the laser light l is viewed from above the regeneration layer 2, and the regeneration layer 2 is made of the same material as the protective layer 4 as shown in FIG. The protective layer of may be formed.
상기한 바와 같이 구성되는 본 고안의 광자기 기록매체의 기록 및 재생동작을 설명하면 다음과 같다.The recording and reproducing operation of the magneto-optical recording medium of the present invention configured as described above is as follows.
제6도에 도시한 바와 같이, 광자기 기록매체의 기판(1) 하측에서 레이저 광(ℓ)이 조사되면, 낮은 큐리에 온도를 갖는 희토류-천이금속의 보자력이 작아지게 되고, 이와 동시에 도시한 화살표(a)의 방향으로 외부자장을 인가하게 되면, 이 방향으로 자기모우멘트가 반전된다.As shown in FIG. 6, when the laser light l is irradiated under the substrate 1 of the magneto-optical recording medium, the coercive force of the rare earth-transition metal having a low Curie temperature becomes small, and at the same time When an external magnetic field is applied in the direction of arrow a, the magnetic moment is reversed in this direction.
이에 따라서 바륨 헥사 페라이트의 재생층(2)은 Hc가 작으므로 자기전사가 되어 기록층(3)의 반전부분에 대응하는 부분만 자기모우멘트가 반전됨으로써 정보가 기록되는 것이다.Accordingly, the barium hexa ferrite reproducing layer 2 is self-transferred because Hc is small, so that only the portion corresponding to the inverted portion of the recording layer 3 is inverted and the information is recorded.
한편, 정보의 재생동작은 재생층(2)에 도시한 화살표(a)의 방향으로 레이저 광(ℓ)을 입사하게 되면 재생층(2)으로부터 반사되는 편광면이 회전하는 큰 자기광학적 효과를 이용함으로써 수행된다.On the other hand, the information reproducing operation uses a large magneto-optical effect in which the polarization plane reflected from the reproducing layer 2 rotates when the laser light L is incident in the direction of the arrow a shown in the reproducing layer 2. Is performed.
이때, 재생 레이저의 출력은 기록 레이저의 출력보다 충분히 낮아도 무방하다.At this time, the output of the reproduction laser may be sufficiently lower than the output of the recording laser.
또한 제2도 내지 제5도에 도시한 본 고안의 다른 실시예도 동일한 작용으로서 정보를 기록 및 재생하게 된다.In addition, other embodiments of the present invention shown in FIGS. 2 to 5 also record and reproduce information with the same operation.
제7도 및 제8도는 본 고안의 광자기 기록매체와 종래의 광자기 기록매체의 기록 및 재생출력에 대한 CNR값을 비교한 것으로서, 본 고안의 광자기 기록매체가 종래의 광자기기록매체보다 CNR값이 높은 것을 알 수 있다.7 and 8 compare CNR values of recording and reproducing outputs of the magneto-optical recording medium of the present invention and the conventional magneto-optical recording medium, and the magneto-optical recording medium of the present invention is better than the conventional magneto-optical recording medium. It can be seen that the CNR value is high.
이상에서 상세히 설명한 바와 같은 본 고안의 광자기기록매체는 기판에 바륨헥사 페라이트를 이용하여 재생층 및 큐리에 온도가 낮고 보자력이 큰 희토류-천이금속의 비정질 합금의 수직자기 이방성막의 기록층을 형성함으로써 기록감도 및 비트의 안정성을 향상시킬 수 있으며, 뿐만 아니라 바륨 헥사 페라이트의 자기광학효과가 크고 보자력이 작은 특성을 이용하여 CNR, SNR 등의 재생감도를 향상시키는 효과를 얻게 된다.The magneto-optical recording medium of the present invention as described in detail above uses a barium hexaferrite on a substrate to form a recording layer of a vertical magnetic anisotropic film of an amorphous alloy of rare earth-transition metal having a low coercive temperature and a high coercivity by using a barium hexaferrite It is possible to improve recording sensitivity and bit stability, and to improve reproduction sensitivity of CNR and SNR by using barium hexaferrite having a large magneto-optical effect and a small coercive force.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890019528U KR950004494Y1 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium |
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| Application Number | Priority Date | Filing Date | Title |
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| KR2019890019528U KR950004494Y1 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium |
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| KR910012589U KR910012589U (en) | 1991-07-30 |
| KR950004494Y1 true KR950004494Y1 (en) | 1995-06-05 |
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| KR2019890019528U KR950004494Y1 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium |
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| KR (1) | KR950004494Y1 (en) |
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- 1989-12-22 KR KR2019890019528U patent/KR950004494Y1/en not_active IP Right Cessation
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