JPS59160847A - Photomagnetic recording medium - Google Patents
Photomagnetic recording mediumInfo
- Publication number
- JPS59160847A JPS59160847A JP3275583A JP3275583A JPS59160847A JP S59160847 A JPS59160847 A JP S59160847A JP 3275583 A JP3275583 A JP 3275583A JP 3275583 A JP3275583 A JP 3275583A JP S59160847 A JPS59160847 A JP S59160847A
- Authority
- JP
- Japan
- Prior art keywords
- guide groove
- groove
- thickness
- thin film
- film
- 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
- 239000010409 thin film Substances 0.000 claims abstract description 33
- 244000089486 Phragmites australis subsp australis Species 0.000 claims 1
- 235000014676 Phragmites communis Nutrition 0.000 claims 1
- 239000010408 film Substances 0.000 abstract description 11
- 239000000758 substrate Substances 0.000 abstract description 9
- 230000003287 optical effect Effects 0.000 abstract description 5
- 239000000696 magnetic material Substances 0.000 abstract description 4
- 239000002223 garnet Substances 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 abstract 2
- BTFMCMVEUCGQDX-UHFFFAOYSA-N 1-[10-[3-[4-(2-hydroxyethyl)-1-piperidinyl]propyl]-2-phenothiazinyl]ethanone Chemical compound C12=CC(C(=O)C)=CC=C2SC2=CC=CC=C2N1CCCN1CCC(CCO)CC1 BTFMCMVEUCGQDX-UHFFFAOYSA-N 0.000 abstract 1
- 229910016629 MnBi Inorganic materials 0.000 abstract 1
- 239000012788 optical film Substances 0.000 abstract 1
- 229960004265 piperacetazine Drugs 0.000 abstract 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 abstract 1
- 239000004926 polymethyl methacrylate Substances 0.000 abstract 1
- 238000002310 reflectometry Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- -1 argon ion Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
Classifications
-
- 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
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
-
- 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
- G11B11/10578—Servo format, e.g. prepits, guide tracks, pilot signals
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は光磁気記録に係り、特に、レーザ光を、用いて
記録・再生を行なう光磁気記録媒体に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to magneto-optical recording, and particularly to a magneto-optical recording medium that performs recording and reproduction using laser light.
磁気記録における記録密度の高密度化にともなって、レ
ーザ光を用いて情報を記録・再生する光磁気記録が注目
されている。光磁気記録方式で高密度記録が可能な理由
の一つには、光スポットを利用しているためトラック間
隔をＩＡｍ程度以下にまでできるという特長を有してい
ることである。2. Description of the Related Art As the recording density in magnetic recording increases, magneto-optical recording, which uses laser light to record and reproduce information, is attracting attention. One of the reasons why high-density recording is possible with the magneto-optical recording method is that it has the advantage that the track spacing can be reduced to about IAm or less because it uses a light spot.
但し、記録・再生の際には、記録トラックの半径方向の
動きに応じて、細く絞られたレーザ光束を動かし、記録
トラックを常に光スポットの中心でとらえるように制御
すること、つまりトラッキングが必要である。However, during recording and playback, it is necessary to control the recording track by moving a narrowly focused laser beam according to the radial movement of the recording track so that the recording track is always captured at the center of the optical spot.In other words, tracking is required. It is.
トラッキングの方法としては、従来、３スポツト法が用
いられている。Conventionally, a three-spot method has been used as a tracking method.
３スポツト法では、第１図に示すように、信号読取用光
スポラ）ｌｂの他に、一対の光スポットｌａ、ｌｃをト
ラック中心から正負にわずかにずらして記録ビット列２
ａ、２ｂ、２ｃ上に投射し、反射光の偏光面の回転成分
を検出することによシ、トラックを追従することができ
る。しかし、このトラッキング方式では、記録ビットの
薔き込み時と、長い部分にわたって記録ビットが存在し
ない場合の再生時にはトラッキングが行なえず、光磁気
記録の特徴や一つであるトラック毎の消去・誉き換えを
生かすことができない。この問題を解決するために、結
晶化ガイドトラックを設ける方法と、基板にガイド溝を
設ける方法が既に提案されている。In the three-spot method, as shown in FIG. 1, in addition to the signal reading optical spora) lb, a pair of optical spots la and lc are slightly shifted in the positive and negative directions from the track center to produce a recording bit string 2.
A, 2b, and 2c are projected and the track can be followed by detecting the rotational component of the polarization plane of the reflected light. However, with this tracking method, tracking cannot be performed when recording bits are inserted or during playback when there are no recorded bits over a long section, and one of the characteristics of magneto-optical recording is the ability to erase and honor each track. I can't take advantage of the change. In order to solve this problem, a method of providing a crystallization guide track and a method of providing a guide groove in the substrate have already been proposed.
光磁気記録材として非晶質磁性薄膜を用いた場合には、
第２図に示すように、レーザ光によシガイドトラック３
を結晶化して設けることができる。When an amorphous magnetic thin film is used as a magneto-optical recording material,
As shown in Fig. 2, the guide track 3 is
It can be provided by crystallizing.
結晶化した部分では光の透過率が大きくなっているため
、光スポットエａと１０の透過光量差を検出することに
よってトラッキングを行なえる。そのためこの方式では
、記録ビットがない場合でもトラッキングを行うことが
できる。しかし、結晶化領域と非晶質領域との境界が直
線状になるように結晶化トラックを作製することは極め
て困難であシ、通常、結晶化ガイドトラック３と記録ト
ラックとの境界線は入シ組んでしまう。そのため、光ス
ポットの中心は記録トラック上を揺動することになシ、
精度のよいトラッキングができない。Since the light transmittance is high in the crystallized portion, tracking can be performed by detecting the difference in the amount of transmitted light between the light spots a and 10. Therefore, with this method, tracking can be performed even when there are no recording bits. However, it is extremely difficult to create a crystallization track so that the boundary between the crystallized region and the amorphous region is a straight line, and usually the boundary between the crystallization guide track 3 and the recording track is a straight line. I'm going to put it together. Therefore, the center of the light spot does not have to oscillate on the recording track.
Accurate tracking is not possible.
また、透過率の差は高々数％であるためトラッキングの
感度も悪い。さらにこの方法の不利な点ｔよ、非晶質磁
性体薄膜のみにしか適用できない点である。Furthermore, since the difference in transmittance is only a few percent at most, tracking sensitivity is also poor. A further disadvantage of this method is that it can only be applied to amorphous magnetic thin films.
一方、第３図に示すように、基板７自身にあらかじめガ
イド溝８を設けておき、その上に磁性体薄膜６を形成し
、反射光の回折を利用してトラッキングを行うこともで
きる。すなわち、光スポットの中心がガイド溝８の中心
にあるとき、回折光強度はガイド溝８に対して対称”と
なるが、ガイド溝８がｉ位すると回折光は非対称な強度
分布をもつこと−を利用する。この方法では、記録信号
がない場合でも、また非晶質以外の磁性体薄膜にでも適
用可能である。しかし、回折をおこすためにはガイド溝
８の深さがレーザ波長の８分の１程度でなければならず
、このような深さの溝を基板上に直接加工することは不
可能である。同様に、１μｍ以下に記録トラックを狭加
工することも困難である。また回折効率を高めるには、
ガイド溝８とガイド溝凸部１０との間の斜面９は基板面
に対して垂直にしなければならないが、そうすると磁性
体薄膜６は斜面９部で段切れを生じてしまい、再生時に
は雑音の原因となる。On the other hand, as shown in FIG. 3, it is also possible to provide a guide groove 8 in advance on the substrate 7 itself, form a magnetic thin film 6 thereon, and perform tracking using diffraction of reflected light. That is, when the center of the light spot is at the center of the guide groove 8, the intensity of the diffracted light is symmetrical with respect to the guide groove 8, but when the guide groove 8 is at the i position, the diffracted light has an asymmetric intensity distribution. This method can be applied even when there is no recording signal and can be applied to magnetic thin films other than amorphous.However, in order to cause diffraction, the depth of the guide groove 8 must be 8 times the laser wavelength. It is impossible to directly process grooves with such a depth on the substrate.Similarly, it is also difficult to process recording tracks to be narrower than 1 μm. To increase diffraction efficiency,
The slope 9 between the guide groove 8 and the guide groove convex portion 10 must be perpendicular to the substrate surface, but if this is done, the magnetic thin film 6 will break at the slope 9, causing noise during playback. becomes.
本発明の目的は、上述の考察から、従来のトラッキング
方式がもつ欠点を改善するために、トラッキングが容易
にでき、あらゆる磁性体薄膜に適用可能で、しかもトラ
ック間隔を１μｍ以下にできる光磁気記録媒体を提供す
ることにある。From the above considerations, an object of the present invention is to provide a magneto-optical recording system that can be easily tracked, can be applied to any magnetic thin film, and can have a track spacing of 1 μm or less, in order to improve the drawbacks of conventional tracking methods. The goal is to provide a medium.
上記の目的を達成するために、本発明の光磁気記録媒体
では、磁性体薄膜上にガイド溝をもつ誘電体薄膜を設け
たことを特徴としておシ、該ガイド溝による光の反射率
差を利用してドラッギングを行う。In order to achieve the above object, the magneto-optical recording medium of the present invention is characterized in that a dielectric thin film having guide grooves is provided on a magnetic thin film. Use this to perform dragging.
以下、本発明の実施例を図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第４図は本発明になる光磁気記録媒体の一実施例を示す
斜視図である。ガラスあるいはポリメチル・メタ・アク
リレ−）（ＰΔ４ＭＡ ）等の基板７上には１． Ｃｒ
Ｏ２１Ｃｏ−Ｃｒ 、 Ｇｄ−Ｃｏ、 Ｔｂ−Ｆｅ１Ｍ
ｎ１３ｉ、磁性ガーネット等の磁性体薄膜６が設けられ
ておシ、該薄膜上にはガイド溝８をもった誘電体薄膜１
１が形成されている。記録トラックはガイド？！！８部
である。ここで、ガイド溝８の厚さは反射光強度が最小
になるような厚さに設定されておシ、逆に、ガイド溝凸
部１０は反射光強度が最大になるような厚さに設定され
ている。たとえば、磁性体薄膜６としてＴｂ−Ｆｅ非晶
質磁性体薄膜を用い、Ｈｅ−Ｎｅレーザを使用した場合
には、ＳｉＯ誘電体薄膜を、ガイド溝８の厚さが７７ｎ
ｍになるように設け、ガイド溝凸部１０の厚さが１６６
ｎｍになるように設ければよい。このような膜厚に設
定する理由を第５図（ＴＬＪ。FIG. 4 is a perspective view showing an embodiment of the magneto-optical recording medium according to the present invention. 1. On the substrate 7 made of glass or polymethyl meta acrylate (PΔ4MA), etc. Cr
O21Co-Cr, Gd-Co, Tb-Fe1M
A thin film 6 of magnetic material such as magnetic garnet or the like is provided on the thin film, and a thin dielectric film 1 having guide grooves 8 is provided on the thin film.
1 is formed. Is the recording track a guide? ! ! There are 8 parts. Here, the thickness of the guide groove 8 is set to a thickness that minimizes the intensity of reflected light, and conversely, the thickness of the guide groove convex portion 10 is set to a thickness that maximizes the intensity of reflected light. has been done. For example, when a Tb-Fe amorphous magnetic thin film is used as the magnetic thin film 6 and a He-Ne laser is used, the guide groove 8 has a thickness of 77 nm using a SiO dielectric thin film.
m, and the thickness of the guide groove convex portion 10 is 166 mm.
What is necessary is just to provide it so that it may become nm. The reason for setting such a film thickness is shown in Figure 5 (TLJ.
Ｃｈｅｎ、 Ｄ、 Ｃｈｅｎｇ ｌ ａｎｄＧ−１３−
Ｃｈａｒｌ ａ” ； Ｉ ＥＥＥＴｒａｎｓ、Ｍａｇ
ｎ、、ＭＡＧ−１６，１１９４（１９８０））を用いて
説明する。第５図は、Ｔｂ−Ｆｅ非晶質磁性体薄膜上に
Ｓｉｎｇ電体薄膜を形成したときの、Ｈｅ−Ｎｅレーザ
波長における反射率およびカー回転角のＳｉＯ膜厚依存
性を示したものである。Chen, D., and G-13-
Charl a”; I EEET Trans, Mag
An explanation will be given using the following: MAG-16, 1194 (1980)). Figure 5 shows the SiO film thickness dependence of reflectance and Kerr rotation angle at the He-Ne laser wavelength when a Sing electric thin film is formed on a Tb-Fe amorphous magnetic thin film. .
図かられかるように、ＳｉＯ膜厚が７７ｎｍのときには
反射率が最小値１７．４％となシ、１６６ｎｍのときに
は５６．２％となる。そのため、第４図に示すガイド溝
８、ガイド溝凸部１０各々からの反射光強度には３８，
８％の強度差が存在する。As can be seen from the figure, when the SiO film thickness is 77 nm, the reflectance is a minimum value of 17.4%, and when it is 166 nm, it is 56.2%. Therefore, the intensity of reflected light from each of the guide groove 8 and the guide groove convex portion 10 shown in FIG. 4 is 38,
There is an 8% difference in intensity.
したがって、トラッキング信号を得るためには、たとえ
ば、第１図中のｌａ、ＩＣのような一対の光スポットを
ガイド溝８とガイド溝凸部１ｏとの両方にかかるように
投射し、反射光を光検知器で差動的に検出すればよい。Therefore, in order to obtain a tracking signal, for example, a pair of light spots such as la and IC in FIG. 1 are projected so as to cover both the guide groove 8 and the guide groove convex portion 1o, and the reflected light is It may be detected differentially using a photodetector.
なお、ガイド溝８とガイド溝凸部１０の膜厚は前記膜厚
のみに限られるものではなく、第５図かられかるように
、いくつに
かの適当な膜厚がそれぞれ存在する。レーザ波長をかえ
た場合にも最適膜厚が存在する。換言すれば、ガイド溝
８は光学的膜厚がレーザ波長の４分の１の整数倍であれ
ばよく、ガイド溝凸部は２分の１波長の整数倍の膜厚で
あればよい。The thicknesses of the guide grooves 8 and the guide groove convex portions 10 are not limited to the above-mentioned thicknesses, but as can be seen from FIG. 5, there are several suitable thicknesses. An optimum film thickness also exists when the laser wavelength is changed. In other words, the guide groove 8 may have an optical thickness that is an integral multiple of a quarter of the laser wavelength, and the guide groove convex portion may have a thickness that is an integral multiple of a half wavelength.
また、本発明になる光磁気記録媒体において、ガイド溝
８では反射出が小さくレーザ光は効率よく吸収されるた
め、小さなレーザ光強度での記録が可能である。一方、
ガイド溝凸部１ｏはレーザ光を反射し、記録ビットがト
ラック幅以上に広がることを防ぎ均一な幅の記録ビット
を得る役割をも果たしている。Furthermore, in the magneto-optical recording medium of the present invention, since the guide groove 8 reflects little laser light and efficiently absorbs the laser light, recording can be performed with a low laser light intensity. on the other hand,
The guide groove convex portion 1o also plays the role of reflecting the laser beam, preventing the recording bit from spreading beyond the track width, and obtaining recording bits of uniform width.
誘電体薄膜１１の更に別の利点は、カー回転角を増大さ
せることである。第５図に示したように、ＳｉＯ誘電体
薄膜を形成することによｆｉ、Ｔｂ−ｐｅ非晶賀磁性体
薄膜のみのカー回転角に比べて約３倍大きくすることが
でき、再生時の信号対雑音比を改善できる。Yet another advantage of dielectric thin film 11 is that it increases the Kerr rotation angle. As shown in Fig. 5, by forming a SiO dielectric thin film, the Kerr rotation angle can be made approximately three times larger than that of only the fi, Tb-pe amorphous magnetic thin film. Signal-to-noise ratio can be improved.
第６図は、本発明になる光磁気記録媒体の他の実施例を
示す斜視図である。基板７上には、まず、ガイド溝８を
もった誘電体薄膜１１が形成されておシ、該誘電体薄膜
上に磁性体薄膜６、保護膜１２が順次積層されている。FIG. 6 is a perspective view showing another embodiment of the magneto-optical recording medium according to the present invention. A dielectric thin film 11 having guide grooves 8 is first formed on the substrate 7, and a magnetic thin film 6 and a protective film 12 are sequentially laminated on the dielectric thin film.
ガイド溝８が記録トラックとなっておシ、この部分の磁
性体薄膜６に記録ビットが形成される。トラッキングを
行うには、３つの光スポットを基板７側から入射させ、
第４図に示す実施例で説明したような原理を用いる。The guide groove 8 serves as a recording track, and recording bits are formed in this portion of the magnetic thin film 6. To perform tracking, three light spots are made incident from the substrate 7 side,
The principle as explained in the embodiment shown in FIG. 4 is used.
第４図、第６図に示した実施例において誘電体薄膜１１
にガイド溝８を設けるには、アルゴンイオンレーザ等の
短波長レーザ露光によるパターン形成後、通常のエツチ
ングあるいはスパッタエツチングを行えばよく、この手
法によシガイド溝８の幅は０．５μｍまで微細化でき、
深さはｌＱｎｍ以下の精度で制御可能である。したがっ
て本発明の中核をなすガイド溝８の形成は容易に実現で
きる。しかも、このガイド溝８をもつ誘電体薄膜１１に
隣接して設けられている磁性体薄膜６には、第３図にお
いて問題点として指摘した段切れはない。In the embodiment shown in FIGS. 4 and 6, the dielectric thin film 11
In order to provide the guide grooves 8 in the etching, the width of the guide grooves 8 can be miniaturized to 0.5 μm by performing normal etching or sputter etching after pattern formation by short wavelength laser exposure such as an argon ion laser. I can do it,
The depth can be controlled with an accuracy of lQnm or less. Therefore, the formation of the guide groove 8, which is the core of the present invention, can be easily realized. Moreover, the magnetic thin film 6 provided adjacent to the dielectric thin film 11 having the guide groove 8 does not have the step break pointed out as a problem in FIG.
〔発明の効果〕
以上詳細に説明したように、本発明によれば、磁性体薄
膜上に形成した誘電体薄膜にガイド溝を設けることによ
ってトラッキング信号を得ることができ、しかもトラッ
ク間隔が１μｍ以下の光磁気記録媒体を提供できるもの
である。[Effects of the Invention] As described above in detail, according to the present invention, a tracking signal can be obtained by providing a guide groove in a dielectric thin film formed on a magnetic thin film, and the track spacing is 1 μm or less. Accordingly, it is possible to provide a magneto-optical recording medium.
第１図は光磁気記録におけるトラッキング例を示す説明
図、第２図、第３図は従来の光磁気記録媒体の平面図と
斜視図、第４図は本発明になる光磁気記録媒体の一実施
例を示す斜視図、第５図は反射率およびカー回転角の特
性を示す図、第６図は本発明になる光磁気記録媒体の他
の実施例を示す斜視図である。
６・・・磁性体薄膜、７・・・基板、８・・・ガイド溝
、１０・・・ガイド溝凸部、１１・・・誘電体薄膜、１
２・・・保護晃 １ 図
箇 ２ 図
１Ｃ４−ｚｂ ２Ｃ
第３ 図
嘉４ 因FIG. 1 is an explanatory diagram showing an example of tracking in magneto-optical recording, FIGS. 2 and 3 are a plan view and a perspective view of a conventional magneto-optical recording medium, and FIG. 4 is an illustration of a magneto-optical recording medium according to the present invention. FIG. 5 is a perspective view showing the reflectance and Kerr rotation angle characteristics, and FIG. 6 is a perspective view showing another example of the magneto-optical recording medium according to the present invention. 6... Magnetic thin film, 7... Substrate, 8... Guide groove, 10... Guide groove convex portion, 11... Dielectric thin film, 1
2...Protection Akira 1 Figure 2 Figure 1C4-zb 2C 3 Figure 4 Cause
Claims (1)
形成された誘電体薄膜とから成ることを特徴とする光磁
気記録媒体。A magneto-optical recording medium comprising a magnetic thin film and a dielectric thin film on which reeds and guide grooves are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3275583A JPS59160847A (en) | 1983-03-02 | 1983-03-02 | Photomagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3275583A JPS59160847A (en) | 1983-03-02 | 1983-03-02 | Photomagnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59160847A true JPS59160847A (en) | 1984-09-11 |
Family
ID=12367654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3275583A Pending JPS59160847A (en) | 1983-03-02 | 1983-03-02 | Photomagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59160847A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60253038A (en) * | 1984-05-29 | 1985-12-13 | Ricoh Co Ltd | Photomagnetic disk |
| JPS61162844A (en) * | 1985-01-14 | 1986-07-23 | Ricoh Co Ltd | Photomagnetic recording medium and its production |
| JPH02301658A (en) * | 1989-05-15 | 1990-12-13 | Tomonobu Maeda | Magnetic processing device for fuel |
-
1983
- 1983-03-02 JP JP3275583A patent/JPS59160847A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60253038A (en) * | 1984-05-29 | 1985-12-13 | Ricoh Co Ltd | Photomagnetic disk |
| JPS61162844A (en) * | 1985-01-14 | 1986-07-23 | Ricoh Co Ltd | Photomagnetic recording medium and its production |
| JPH02301658A (en) * | 1989-05-15 | 1990-12-13 | Tomonobu Maeda | Magnetic processing device for fuel |
| JPH0477146B2 (en) * | 1989-05-15 | 1992-12-07 | Tomonobu Maeda |
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