KR950005965B1 - Optical recording medium - Google Patents
Optical recording medium Download PDFInfo
- Publication number
- KR950005965B1 KR950005965B1 KR1019930002689A KR930002689A KR950005965B1 KR 950005965 B1 KR950005965 B1 KR 950005965B1 KR 1019930002689 A KR1019930002689 A KR 1019930002689A KR 930002689 A KR930002689 A KR 930002689A KR 950005965 B1 KR950005965 B1 KR 950005965B1
- Authority
- KR
- South Korea
- Prior art keywords
- film
- recording
- magneto
- magnetic field
- recording medium
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title description 2
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 3
- 229910002546 FeCo Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910004205 SiNX Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 229910052692 Dysprosium Inorganic materials 0.000 description 2
- 229910052771 Terbium Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
Classifications
-
- 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
- G11B7/243—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 comprising inorganic materials only, e.g. ablative layers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래 광자기 기록 매체의 구조도.1 is a structural diagram of a conventional magneto-optical recording medium.
제2도는 본 발명의 광자기 기록 매체의 구조도.2 is a structural diagram of a magneto-optical recording medium of the present invention.
제3도는 자계 감도 특성을 나타낸 그래프.3 is a graph showing magnetic field sensitivity characteristics.
제4도는 내산화성 특성을 나타낸 그래프.4 is a graph showing the oxidation resistance characteristics.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : PC기판 2, 4 : 보호막1: PC board 2, 4: Protective film
5 : 반사막 6 : 기록막5: reflective film 6: recording film
본 발명은 광자기 기록 매체에 관한 것으로, 특히 기록막 조성물에 크롬(Cr)을 첨가하여 외부자계에 대한 기록 감도를 향상시킴과 함께 내산화성을 증대시키는 것에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording medium, and more particularly to adding chromium (Cr) to a recording film composition to improve recording sensitivity to an external magnetic field and to increase oxidation resistance.
현재, 고밀도 대용량의 기록 매체에 대한 요구가 증대됨에 따라 각광을 받고 있는 것 중의 하나가 광자기 디스크이다. 그러나 제1세대 광자기 디스크는 기록시에 먼저 소거 과정을 거친 후 제기록하는 방식이기 때문에 제기록용 CD(Compact Disk), 이미지 처리용 정보기록, 고속화를 요하는 응용분야에서는 사용이 제한을 받아왔다.At present, one of the things that has been in the spotlight as the demand for high-density and large-capacity recording media increases is a magneto-optical disk. However, since first-generation magneto-optical disks are first erased and then rewritten during recording, their use is restricted in applications such as CDs for recording, information processing for image processing, and applications requiring high speed. come.
따라서, 소거 과정이 필요없이 직접 기록이 가능한 제2세대 광자기 디스크로 중첩쓰기형 광자기 디스크가 개발되고 있는데, 여기서는 광을 변조하고 일정한 외부자장을 이용하는 광변조형과 외부 자장만을 변조하는 자계 변조용으로 구분된다.Therefore, a superposition-write type magneto-optical disk has been developed as a second-generation magneto-optical disk capable of directly recording without the need for an erasing process, in which an optical modulation using a constant external magnetic field and a magnetic modulation that modulates only an external magnetic field are modulated. It is divided into dragons.
이중 기존의 기술을 쉽게 이용할 수 있다는 용이성때문에 자계 변조형에 대한 연구가 집중되고 있는데 핵심되는 기술로는 기록막이 작은 외부 자장에서도 반응하여 기록이 쉽게 되어야 하는 것이다.Due to the ease of use of existing technology, research on magnetic field modulation type is concentrated. The key technology is that the recording film responds easily even to a small external magnetic field.
즉, 기존의 정보기록은 외부에서 원하는 방향으로 200~300Oe 정도의 자장에서 반응하였으나, 중첩쓰기를 가능하게 하기 위해서는 약 100Oe 이하의 작은 외부 자계에서도 기록이 가능하여야 한다.That is, the existing information recording reacted in the magnetic field of about 200 ~ 300Oe in the desired direction from the outside, but in order to enable the overwriting, it should be possible to record in a small external magnetic field of about 100Oe or less.
그 이유는 자장의 크기에 따라 소모되는 power가 달라지게 되는데 power소모는 외부 자장세기(H), 헤드와 디스크 사이의 거리(h)의 제곱근 및 변조수(frequency)에 비례한다.The reason is that the power consumed depends on the size of the magnetic field. The power consumption is proportional to the external magnetic field strength (H), the square root of the distance (h) between the head and the disk, and the frequency of modulation.
즉, 변조수와 h는 시스템 설계상의 제약조건이므로 H를 제어하여야만 하는데 H를 줄일수록 드라이브(Drive) 마진이 높아진다.In other words, the number of modulations and h are constraints on the system design, so H must be controlled. The lower the H, the higher the drive margin.
종래의 자계 변조형 중첩쓰기 광자기 디스크구조는 제1도에 나타난 바와같이, PC(poly carbonate)기판(1)위에 질화물계(SiNx 또는 AIN)를 이용하여 보호막(2)이 형성된다. 이때 SiNx막은 스퍼터링 법으로 제작되는데 Si타겟(target)을 사용하고 Ar가스와 N2가스를 주입하면서 RF power를 인가시켜 성막한다.In the conventional magnetic modulation type superimposed-write magneto-optical disk structure, as shown in FIG. 1, the protective film 2 is formed on the polycarbonate (PC) substrate 1 using a nitride system (SiNx or AIN). At this time, the SiNx film is manufactured by the sputtering method, using a Si target (target) and injecting Ar gas and N 2 gas while forming a film by applying RF power.
이렇게 성막된 SiNx막은 통상 보호막과 기록신호로 검출되는 Kerr-회전막을 증폭하는 기능으로 사용된다.The SiNx film thus formed is usually used as a function of amplifying the Kerr-rotating film detected by the protective film and the recording signal.
상기한 보호막(2)위에 자기광 효과에 의해 실제기록 Bit가 소거, 기록,재생되는 부분으로 회토류-천이 금속(RE-TM)계인 DyTbFeCo, TbFeCo, GdFeCo, GdTbFeCo 등으로 된 기록막(3)이 형성된다.The recording film 3 made of DyTbFeCo, TbFeCo, GdFeCo, GdTbFeCo, etc., which is a rare earth-transition metal (RE-TM) based on which the actual recording bit is erased, recorded, and reproduced by the magneto-optical effect on the protective film 2 above. Is formed.
그리고 기록막(3) 위에 상기한 보호막과 같은 재질로서 보호막(4)을 형성하고, 그위에 Al로된 반사막(5)이 형성된다.Then, on the recording film 3, a protective film 4 is formed of the same material as the above-described protective film, and a reflective film 5 made of Al is formed thereon.
이와같이 구성된 광자기 디스크는 기록시 외부에서 인가해주는 변조자장을 120 Oe이상으로 크게 해야 하므로 외부자장의 제곱에 비례하는 power소모가 커서 시스템(Drive 등) 구성상에 제약조건이 되며, 회토류-천이금속의 산화에 대한 열화문제가 있어 내산화성을 높일 필요가 있다.The magneto-optical disk configured in this way has to increase the modulated magnetic field applied externally at the time of recording to more than 120 Oe, so power consumption proportional to the square of the external magnetic field is large, which is a constraint on the configuration of the system (Drive, etc.). There is a deterioration problem for the oxidation of the metal, it is necessary to increase the oxidation resistance.
이에 본 발명의 기존의 기록막 조성물에는 크롬을 첨가시켜 자계감도를 향상시킴과 함께 내산화성 증대시키고자 하는데 그 목적이 있다.The purpose of the present invention is to improve the magnetic field sensitivity and increase oxidation resistance by adding chromium to the existing recording film composition of the present invention.
이하 본 발명을 설명한다.Hereinafter, the present invention will be described.
본 발명은 기판상에 보호막, 기록막, 보호막, 반사막과 같은 4층 구조를 갖는 광자기 기록매체에 있어서, 기록막을 조성한 회토류-천이금속에 크롬(Cr)을 첨가하여서 된 것이다.In the magneto-optical recording medium having a four-layer structure such as a protective film, a recording film, a protective film, and a reflective film on a substrate, chromium (Cr) is added to the rare earth-transition metal having the recording film.
이때 기록막의 조성범위는 (TbDy)28-x(FeCo)72Crx의 산식으로서 x의 범위는 5~12at%로 이루어진다.At this time, the composition range of the recording film is a formula of (TbDy) 28-x (FeCo) 72 Cr x and the range of x is 5 to 12 at%.
제2도는 본 발명의 광자기 디스크 구조도로서, 4층을 이루는 전체의 구조는 제1도인 종래와 같으나, 기존의 기록막을 이루는 회토류-천이 금속이 Cr을 첨가한 것이 본 발명의 기록막(6)이다.FIG. 2 is a structure diagram of the magneto-optical disk of the present invention, in which the entire structure of the four layers is the same as that of FIG. )to be.
이와같은 기록막은 기존의 DyTbFeCo 타겟(target)과 Cr타겟을 Co-sputtering 법을 이용하여 DyTbFeCoCr의 혼합조성막을 형성시킨다. 이때 기록막의 두께는 100-300Å으로 한다.Such a recording film forms a mixed film of DyTbFeCoCr using a Co-sputtering method of the existing DyTbFeCo target and Cr target. At this time, the thickness of the recording film is 100-300 mW.
본 발명에 첨가되는 Cr은 Tb 또는 Dy와 결합하여 Tb 및 Dy의 수직자기 이방성을 낮게 해주는 역할을 하여 외부자계에 대한 감도를 향상시켜 주므로서 약 70 Oe의 약한 외부자계에서도 제3도와 같이 자화가 반전되는 효과를 얻을 수 있다.Cr is added to the present invention in combination with Tb or Dy serves to lower the vertical magnetic anisotropy of Tb and Dy to improve the sensitivity to external magnetic field, even in weak external magnetic field of about 70 Oe as shown in FIG. Inverted effect can be obtained.
또한, Cr은 내식성이 우수한 물질로 회토류-천이금속과 결합하여 TbDyFeCoCr이 되었을 경우 Tb의 산화를 방지해주므로서 제4도에 나타난 바와같이 내산화성을 향상시킬 수 있다.In addition, Cr is a material having excellent corrosion resistance, and when combined with a rare earth-transition metal to become TbDyFeCoCr, oxidation of Tb can be prevented and oxidation resistance can be improved as shown in FIG.
상기와 같은 조성물로된 기록막을 가진 본 발명은 기존의 중첩쓰기 광자기 디스크보다 외부자계 감도가 뛰어난 낮은 외부 자계에서도 소거/기록이 가능하여 시스템(Drive 등)에 대한 높은 자계 Margin을 갖고 있으며 또한 낮은 자계에서도 동작이 가능하므로 Drive의 전력 소모도 경감시킬 수 있는 효과를 가지므로 음악용 MD(Mini Disk)와 같은 휴대용 장치에서 전력소모를 극소화시킬 수 있는 장점을 가지고 있다. 또한, Cr에 의해 기록막의 내산화성이 우수해지므로 신뢰성이 높은 Disk의 제조가 가능하다.The present invention having the recording film of the composition described above has a high magnetic field margin for the system (Drive, etc.) since it can be erased / recorded even at a low external magnetic field having excellent external magnetic sensitivity than the conventional superimposed magneto-optical disk. Since it can operate in the magnetic field, it also has the effect of reducing the power consumption of the drive, which has the advantage of minimizing the power consumption in portable devices such as music MD (Mini Disk). In addition, since oxidation of the recording film is excellent by Cr, it is possible to manufacture highly reliable disks.
Claims (2)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930002689A KR950005965B1 (en) | 1993-02-25 | 1993-02-25 | Optical recording medium |
| JP6053225A JPH06318346A (en) | 1993-02-25 | 1994-02-25 | Photomagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930002689A KR950005965B1 (en) | 1993-02-25 | 1993-02-25 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR940020331A KR940020331A (en) | 1994-09-16 |
| KR950005965B1 true KR950005965B1 (en) | 1995-06-07 |
Family
ID=19351244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019930002689A KR950005965B1 (en) | 1993-02-25 | 1993-02-25 | Optical recording medium |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH06318346A (en) |
| KR (1) | KR950005965B1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0782943B2 (en) * | 1984-05-04 | 1995-09-06 | 株式会社リコー | Amorphous magneto-optical layer |
| JPS6289254A (en) * | 1985-10-16 | 1987-04-23 | Sumitomo Metal Mining Co Ltd | Photomagnetic recording medium |
| JPH06187681A (en) * | 1992-12-16 | 1994-07-08 | Ricoh Co Ltd | Magneto-optical recording medium |
-
1993
- 1993-02-25 KR KR1019930002689A patent/KR950005965B1/en not_active IP Right Cessation
-
1994
- 1994-02-25 JP JP6053225A patent/JPH06318346A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR940020331A (en) | 1994-09-16 |
| JPH06318346A (en) | 1994-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0606129B1 (en) | Magneto-optical recording and reproducing device | |
| US4882231A (en) | Magneto-optical recording medium | |
| US5631096A (en) | Magneto optical memory device | |
| JP2999895B2 (en) | Magneto-optical recording medium | |
| US5502692A (en) | Method and apparatus for recording, reproducing and overwriting information on or from a magnetooptic disk having three magnetic layers | |
| KR100308857B1 (en) | Magneto-optical recording medium, magneto-optical recording method, and magneto-optical recording apparatus | |
| KR950005965B1 (en) | Optical recording medium | |
| JPH06223420A (en) | Magneto-optical recording medium | |
| US5768218A (en) | Magneto-optical recording medium having a plurality of magnetic layers | |
| US5263015A (en) | Magneto-optical recording media and overwrite recording method using the same | |
| US5822282A (en) | Magneto-optical recording medium having a plurality of magnetic layers for use in light modulation technique | |
| US5982713A (en) | Magneto-optical recording medium | |
| JPH076420A (en) | Magneto-optical recording medium | |
| JPH06251443A (en) | Magneto-optical recording medium | |
| US6118736A (en) | Magneto-optical recording medium having a reading layer in which transferred recording marks are extended | |
| JP3091099B2 (en) | Magneto-optical recording medium and magneto-optical recording / reproducing method | |
| JP2604475B2 (en) | Magneto-optical recording medium | |
| JP2955174B2 (en) | Cartridge for magneto-optical recording medium | |
| JP2800444B2 (en) | Magneto-optical recording medium and recording / reproducing method thereof | |
| JP3210916B2 (en) | Reproduction method of magneto-optical recording medium | |
| KR940010810B1 (en) | Optical-magnetic recording media | |
| JPH07161082A (en) | Magneto-optical recording medium and magneto-optical recording method | |
| JP3443410B2 (en) | Magneto-optical recording medium and reproducing method thereof | |
| JP2913875B2 (en) | Magneto-optical recording medium and recording / reproducing method thereof | |
| JP3272539B2 (en) | Magneto-optical recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 19930225 |
|
| PA0201 | Request for examination |
Patent event code: PA02012R01D Patent event date: 19930225 Comment text: Request for Examination of Application |
|
| PG1501 | Laying open of application | ||
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 19950209 Patent event code: PE09021S01D |
|
| G160 | Decision to publish patent application | ||
| PG1605 | Publication of application before grant of patent |
Comment text: Decision on Publication of Application Patent event code: PG16051S01I Patent event date: 19950511 |
|
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 19950814 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 19950920 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 19950920 End annual number: 3 Start annual number: 1 |
|
| PR1001 | Payment of annual fee |
Payment date: 19971229 Start annual number: 4 End annual number: 4 |
|
| FPAY | Annual fee payment |
Payment date: 19981221 Year of fee payment: 5 |
|
| PR1001 | Payment of annual fee |
Payment date: 19981221 Start annual number: 5 End annual number: 5 |
|
| LAPS | Lapse due to unpaid annual fee | ||
| PC1903 | Unpaid annual fee |