JPH01130347A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPH01130347A JPH01130347A JP29017087A JP29017087A JPH01130347A JP H01130347 A JPH01130347 A JP H01130347A JP 29017087 A JP29017087 A JP 29017087A JP 29017087 A JP29017087 A JP 29017087A JP H01130347 A JPH01130347 A JP H01130347A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetic field
- recording medium
- wear
- magneto
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 239000000696 magnetic material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 101100069231 Caenorhabditis elegans gkow-1 gene Proteins 0.000 claims 1
- 229910052961 molybdenite Inorganic materials 0.000 abstract description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 19
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明はマグネトプランバイト型酸化物磁性体を用い、
磁界変調方式によりオーバーライド可能な光磁気記録媒
体に関する。[Detailed description of the invention] [Technical field] The present invention uses a magnetoplumbite type oxide magnetic material,
The present invention relates to a magneto-optical recording medium that can be overridden using a magnetic field modulation method.
一般に、書き換え（オーバーライド）可能な光磁気記録
媒体の記録層としては半導体レーザ（ＬＤ）を２個用い
てオーバーライドする２へラド方式、磁界を変調して行
う磁界変調方式とに大別され、る、前者の方式はＬＤを
複数個用いているため、ヘッドが重くなり、アクセス時
間が長くなったり、コストが高くなる等の問題点を有す
る。一方、磁界変調方式は媒体と磁界変調ヘッドをある
距離（数μｍ〜０．１ｍｍ程度）ｍｉｌｌし、磁界を変
調することにより情報の記録を行うものである。しかし
、高周波領域（数Ｍ Ｈｚ〜５ＭＨｚ）で記録、消去に
要する磁界（数百Ｏｅ）を得るためには磁界変調ヘッド
を記録媒体にできる限り近づけることが望ましい、しか
るに、変調ヘッドに用いる軟磁性体は高周波領域で透過
率が低下するため、媒体面上での磁界が小さくなること
、さらには軟磁性体の周囲に巻くコイルは高周波領域で
インダクタンスが大きくなってしまうため、あまりター
ン数を大きくできず、かといってターン数を小さくする
と、その分電流を増さなければならないが、これにも限
界を有する。In general, the recording layer of a rewritable (overridable) magneto-optical recording medium is broadly divided into the 2-Herrad method, which uses two semiconductor lasers (LDs) for overwriting, and the magnetic field modulation method, which modulates the magnetic field. Since the former method uses a plurality of LDs, it has problems such as a heavier head, longer access time, and higher cost. On the other hand, in the magnetic field modulation method, information is recorded by placing the medium and the magnetic field modulation head at a certain distance (about several μm to 0.1 mm) and modulating the magnetic field. However, in order to obtain the magnetic field (several hundred Oe) required for recording and erasing in the high frequency region (several MHz to 5 MHz), it is desirable to place the magnetic field modulation head as close as possible to the recording medium. Since the transmittance of the body decreases in the high frequency range, the magnetic field on the medium surface becomes smaller, and furthermore, the inductance of the coil wound around the soft magnetic material increases in the high frequency range, so it is not recommended to increase the number of turns. However, if the number of turns is reduced, the current must be increased accordingly, but this also has its limits.
ところで、光磁気記録媒体の記録層としては希土類−遷
移金属合金磁性体、マグネトプランバイト型酸化物磁性
体およびスピネルフェライトなどの酸化物磁性体が知ら
れている。このうち、希土類−遷移合金磁性体を用いる
場合にはこの磁性体が酸化しやすいため、第２図に示さ
れるように、磁性層３を基板１，５および保護層２，４
ではさむようにし、酸化による経時変化を防止する必要
がある。このような記録媒体を用いて磁界変調を行う場
合、磁性層３と磁界変調ヘッド６とは１ｍｍ〜数ｍｍ離
れてしまい、媒体面で数百Ｏｅの磁界を得るのは困難で
ある。Incidentally, oxide magnetic materials such as rare earth-transition metal alloy magnetic materials, magnetoplumbite type oxide magnetic materials, and spinel ferrite are known as recording layers of magneto-optical recording media. Among these, when a rare earth-transition alloy magnetic material is used, this magnetic material is easily oxidized, so as shown in FIG.
It is necessary to prevent changes over time due to oxidation. When performing magnetic field modulation using such a recording medium, the magnetic layer 3 and the magnetic field modulation head 6 are separated by 1 mm to several mm, making it difficult to obtain a magnetic field of several hundred Oe on the medium surface.
一方、マグネトプランバイト型酸化物磁性体を用す−る
場合には、第３図および第４図に示すように、基板７に
下地層８．磁性層９、反射層１０あるいはさらに保護層
１１を順次積層して構成されることが考えられるため、
磁界変調ヘッドと媒体との距離は自由に、例えば０．１
ｍｍ以下の極く近接して設計できる。しかし、媒体と磁
界変調ヘッドを数μｍ程度離す場合には、その距離を一
定に保つために正確な制御技術が必要となる１例えば第
５図に示すように磁界変調ヘッド１３側にＬＤ１６を設
け、記録媒体１２からの反射光強度を一定に保つことに
より距離を一定に保つ等複雑な構成を必要とする問題点
があった。On the other hand, when using a magnetoplumbite type oxide magnetic material, as shown in FIGS. 3 and 4, a base layer 8. It is conceivable that the magnetic layer 9, the reflective layer 10, or the protective layer 11 may be sequentially laminated.
The distance between the magnetic field modulation head and the medium can be set freely, for example, 0.1
It can be designed very close to each other, less than mm. However, when the medium and the magnetic field modulation head are separated by several micrometers, accurate control technology is required to keep the distance constant1. For example, as shown in FIG. 5, an LD 16 is installed on the magnetic field modulation head 13 side. However, there is a problem in that a complicated configuration is required, such as keeping the distance constant by keeping the intensity of the reflected light from the recording medium 12 constant.
なお、第５図において、１４はハーフミラ−１１５は受
光素子である。In addition, in FIG. 5, 14 is a half mirror and 115 is a light receiving element.
本発明はマグネトプランバイト型酸化物磁性体を用い、
磁界変調方式によりオーバーライド可能で、しかも簡単
な構成により高周波領域での記録、消去が可能な光磁気
記録媒体を提供することを目的とするものである。The present invention uses magnetoplumbite type oxide magnetic material,
The object of the present invention is to provide a magneto-optical recording medium that can be overridden using a magnetic field modulation method and that can record and erase data in a high frequency range with a simple configuration.
本発明磁性層としてマグネトプランバイト型酸化物磁性
体を用い、磁界変調方式により記録、消去する光磁気記
録媒体において、磁界変調ヘッドと接する最表面にＳｉ
Ｏ２膜、ＭｏＳ２膜、膜、ＭｏＳ、膜、ＢＮ膜、カーボ
ン膜およびフエ）イト膜から選ばれるいずれかの耐摩耗
性膜を形成したことを特徴とするものである。In the magneto-optical recording medium of the present invention, which uses a magnetoplumbite-type oxide magnetic material as the magnetic layer and records and erases information by a magnetic field modulation method, the outermost surface in contact with the magnetic field modulation head is made of Si.
The present invention is characterized in that a wear-resistant film selected from an O2 film, a MoS2 film, a MoS film, a BN film, a carbon film, and a Feite film is formed.
第１図は本発明に係る光磁気記録媒体の一実施例を示す
ものである。この第１図において、基板２１上（図面で
は下側）に下地層２２、磁性層２３、反射層２４．耐摩
耗性層２５を順次積層して構成される。この耐摩耗性層
２５としては耐摩耗性に優れたＳｉｏ、膜、ＭｏＳ、膜
、ＢＮ膜カーボン膜およびフェライト膜から選ばれるい
ずれかの膜が使用できる。ここでいうフェライト膜には
マグネトプランバイト型フェライト、スピネルフェライ
ト（Ｎｉ、−１ＺｎｚＦｅ、００Ｍｎ１．４ＺｎｚＦｅ
２０４等）が含まれる。これら耐摩耗性膜２５は膜厚数
百人〜数μｍ程度であり、好ましくは１０００人〜１μ
ｍである。これらはスピンコード法、真空蒸着法、スパ
ッタリング法、ＣＶＤ法等により形成される。FIG. 1 shows an embodiment of a magneto-optical recording medium according to the present invention. In FIG. 1, a base layer 22, a magnetic layer 23, a reflective layer 24. It is constructed by sequentially laminating wear-resistant layers 25. As this wear-resistant layer 25, any film selected from Sio, film, MoS, film, BN film, carbon film, and ferrite film with excellent wear resistance can be used. The ferrite film mentioned here includes magnetoplumbite ferrite, spinel ferrite (Ni, -1ZnzFe, 00Mn1.4ZnzFe).
204 etc.) are included. These wear-resistant films 25 have a thickness of about several hundred to several μm, preferably 1000 to 1 μm.
It is m. These are formed by a spin code method, a vacuum evaporation method, a sputtering method, a CVD method, or the like.
本発明の光磁気記録媒体は上記のように構成され、その
最表面（図面最下側）に耐摩耗性層２５を有するため、
磁界変調ヘッド２６を耐摩耗性層２５と接するように配
置できることになる。従って、第５図に示したような複
雑な機構を採らずに磁性層２３と磁界変調ヘッド２６と
の距離を可及的に近接した状態で、しかも高周波領域に
おける記録、消去も安定して行うことが可能となる。The magneto-optical recording medium of the present invention is constructed as described above, and has the wear-resistant layer 25 on its outermost surface (bottom side in the drawing).
This means that the magnetic field modulation head 26 can be placed in contact with the wear-resistant layer 25. Therefore, without using a complicated mechanism as shown in FIG. 5, the distance between the magnetic layer 23 and the magnetic field modulation head 26 can be kept as close as possible, and recording and erasing can be performed stably in the high frequency range. becomes possible.
以上のような本発明によれば、磁界変調方式によるオー
バーライドが、磁界変調ヘッドを記録媒体に接して配置
できるため、簡単な機構により、高周波領域での記録、
消去が可能となり。According to the present invention as described above, since the override using the magnetic field modulation method allows the magnetic field modulation head to be placed in contact with the recording medium, recording in the high frequency region can be performed using a simple mechanism.
Erasure is now possible.
しかも長期信頼性の高い光磁気記録媒体が得られるとい
う効果を有する。Moreover, it has the effect that a magneto-optical recording medium with high long-term reliability can be obtained.
第１図は本発明に係る光磁気記録媒９体の一実施例を示
す断面説明図である。
第２図は希土類−遷移金属合金を用いた光磁気記録媒体
の断面説明図である。
第３図および第４図はマグネトプランバイト型酸化物磁
性体を用いた光磁気記録媒体の断面説明図である。
第５図は第３図および第４図の記録媒体を用いる場合の
媒体と磁界ヘッドとの関係を示す説明図である。
１．５，７，２１・・・基板 ２，４，１１・・・保
護層３．９．２３・・・磁性層 ６，１３．２６・・
・磁界変調ヘッド８．２２・・・下地層 １０．
２４・・・反射層１２・・・記録媒体 １４・・
・ハーフミラ−１５・・・受光素子 １６・・・
半導体レーザ２５・・・耐摩耗性層FIG. 1 is an explanatory cross-sectional view showing one embodiment of a magneto-optical recording medium 9 according to the present invention. FIG. 2 is an explanatory cross-sectional view of a magneto-optical recording medium using a rare earth-transition metal alloy. 3 and 4 are cross-sectional explanatory views of a magneto-optical recording medium using a magnetoplumbite type oxide magnetic material. FIG. 5 is an explanatory diagram showing the relationship between the medium and the magnetic field head when the recording media of FIGS. 3 and 4 are used. 1.5,7,21...Substrate 2,4,11...Protective layer 3.9.23...Magnetic layer 6,13.26...
-Magnetic field modulation head 8.22...base layer 10.
24... Reflective layer 12... Recording medium 14...
・Half mirror 15... Light receiving element 16...
Semiconductor laser 25... wear-resistant layer
Claims (1)
を用い、磁界変調方式により記録、消去する光磁気記録
媒体において、磁界変調ヘッドと接する最表面にＳｉＯ
＿２膜、ＭｏＳ＿２膜、ＢＮ膜、カーボン膜およびフェ
ライト膜から選ばれるいずれかの耐摩耗性膜を形成した
ことを特徴とする光磁気記録媒体。1. In a magneto-optical recording medium that uses magnetoplumbite-type oxide magnetic material as the magnetic layer and records and erases information using a magnetic field modulation method, SiO is placed on the outermost surface in contact with the magnetic field modulation head.
1. A magneto-optical recording medium comprising a wear-resistant film selected from a _2 film, a MoS_2 film, a BN film, a carbon film, and a ferrite film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29017087A JPH01130347A (en) | 1987-11-17 | 1987-11-17 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29017087A JPH01130347A (en) | 1987-11-17 | 1987-11-17 | Magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01130347A true JPH01130347A (en) | 1989-05-23 |
Family
ID=17752656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29017087A Pending JPH01130347A (en) | 1987-11-17 | 1987-11-17 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01130347A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0253240A (en) * | 1988-08-17 | 1990-02-22 | Teijin Ltd | Magneto-optical recording medium |
-
1987
- 1987-11-17 JP JP29017087A patent/JPH01130347A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0253240A (en) * | 1988-08-17 | 1990-02-22 | Teijin Ltd | Magneto-optical recording medium |
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