JPS6370947A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPS6370947A JPS6370947A JP21541386A JP21541386A JPS6370947A JP S6370947 A JPS6370947 A JP S6370947A JP 21541386 A JP21541386 A JP 21541386A JP 21541386 A JP21541386 A JP 21541386A JP S6370947 A JPS6370947 A JP S6370947A
- Authority
- JP
- Japan
- Prior art keywords
- medium
- magneto
- optical recording
- erasing
- recording
- 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
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 9
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 7
- -1 rare earth transition metal Chemical class 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 9
- 150000003624 transition metals Chemical class 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims 3
- 229910052692 Dysprosium Inorganic materials 0.000 claims 1
- 229910052688 Gadolinium Inorganic materials 0.000 claims 1
- 229910052779 Neodymium Inorganic materials 0.000 claims 1
- 229910052772 Samarium Inorganic materials 0.000 claims 1
- 229910052771 Terbium Inorganic materials 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000002609 medium Substances 0.000 description 62
- 238000010586 diagram Methods 0.000 description 11
- 230000005415 magnetization Effects 0.000 description 8
- 239000004417 polycarbonate Substances 0.000 description 6
- 239000001963 growth medium Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 229910017061 Fe Co Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004804 winding 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
- G11B11/10589—Details
- G11B11/10591—Details for improving write-in properties, e.g. Curie-point temperature
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光磁気記録媒体の磁気特性に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to magnetic properties of magneto-optical recording media.
光学的に記録・再生あるいは消去可能な光記録媒体に、
従来より研究開発がさかんにおこなわれてキ几。特に近
年、磁気光学効果を利用し念光磁気記録媒体に、消去書
き換え可能な光記録媒体として実用化寸前の状態である
。光磁気記録の原理に、記録面にレーザ光を照射し、媒
体の一部が熱せられ磁化の消失するキューリ温度近傍に
なった所で磁場を印加し磁化反転てせるというものであ
る。又、消去は記録と同様であるが印加磁場が逆方向に
なるだけである。通常、この印加＠場を与える方法に、
永久磁石を用いる方式と電磁石を用いる方式があるが、
磁場方向の切り換えの容易さから！＠石万式が主流とな
りつつある。Optical recording media that can be optically recorded, reproduced, or erased.
Research and development has been more active than ever before. In particular, in recent years, magneto-optical magnetic recording media using the magneto-optic effect are on the verge of being put into practical use as erasable and rewritable optical recording media. The principle of magneto-optical recording is that a laser beam is irradiated onto the recording surface, and when a portion of the medium is heated to near the Curie temperature, where magnetization disappears, a magnetic field is applied to reverse the magnetization. Also, erasing is similar to recording, except that the applied magnetic field is in the opposite direction. Usually, this method of applying @ field is
There are methods that use permanent magnets and methods that use electromagnets.
Because of the ease of switching the magnetic field direction! @ Ishiman style is becoming mainstream.
ところが、この電磁石方式の場合、光磁気記録層の磁化
反転をおこ嘔せるに十分な出湯を発生させる之めには、
コイルにかなりの電流を流す必要がある九め、消費電力
及びそのための温度上昇が問題となる。例えば、印加磁
場を４０００ａ出す念めには、コイルの巻線を０．２
ｍφ、８００ターンとじｔ場合に１０Ｖ３００ｍＡ必要
となり、温度上昇も３０℃上昇してしまうことになる。However, in the case of this electromagnetic method, in order to generate enough hot water to cause magnetization reversal of the magneto-optical recording layer, it is necessary to
The ninth problem is that a considerable amount of current must be passed through the coil, resulting in power consumption and temperature rise. For example, to make sure that the applied magnetic field is 4000a, the coil winding should be 0.2
In the case of mφ and 800 turns, 10V and 300mA are required, and the temperature will rise by 30°C.
つまり、光磁気記録媒体自身に、より低印加磁場で記録
・消去が十分おこなえるよった磁気特性が要求きれてく
る。In other words, the magneto-optical recording medium itself is required to have better magnetic properties that allow sufficient recording and erasing with a lower applied magnetic field.
そこで本発明にこのような問題点を解決するもので、そ
の目的とするところは、低印加磁場でしかも低記録パワ
ーでも十分記録・消去できる光磁気記録媒体を提供する
ところにある。SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a magneto-optical recording medium that can sufficiently record and erase data even with a low applied magnetic field and low recording power.
本発明の光磁気記録媒体は、透明基板の片面に主たる組
成が希土類遷移金属である光磁気記録層に集光したレー
ザ光を照射することにより、記録・再生及び消去をする
光磁気記録媒体において、光磁気記録層の保磁力が常温
（２５℃）時で３．５ＫＯｅ以上であることを特徴とす
る。The magneto-optical recording medium of the present invention is a magneto-optical recording medium in which recording, reproduction, and erasing are performed by irradiating a magneto-optical recording layer whose main composition is a rare earth transition metal on one side of a transparent substrate with a focused laser beam. , the magneto-optical recording layer has a coercive force of 3.5 KOe or more at room temperature (25° C.).
第１図は、本発明に用い九九磁気記録媒体の断面図であ
る。１は溝付＃ＰＣ（ポリカーボネート）基板で、この
基板上に２として窒化アルミニウムと窒、化シリコンの
複合誘電体膜８００人を成膜し、この上に３としてＮｄ
７Ｄ７ｚｔ Ｆｅ４ｓ ＣＯ２７ａ ｔ％の組成ｆある
光磁気記録！１１ｊａ ｏ ｏＡを成膜しｔｏそしてこ
の上にさらに、２と同じ窒化アルミニウムと窒化シリコ
ンの複合誘電体膜８００人を４として゛成膜し几。５は
密着貼り合せ層であるＵＶ硬化樹脂層で、７Ｆ′ｉ、溝
無しＰＣ基板で、６は溝無しＰＣ基板上にｓｌｏ、５ｏ
ｏＡ成膜し食ものである。FIG. 1 is a sectional view of a multiplication table magnetic recording medium used in the present invention. 1 is a #PC (polycarbonate) substrate with grooves; on this substrate, 800 composite dielectric films of aluminum nitride, nitride, and silicon oxide are formed as 2, and on top of this, as 3, Nd
Magneto-optical recording with composition f of 7D7zt Fe4s CO27a t%! 11 was formed into a film, and on top of this, a composite dielectric film of aluminum nitride and silicon nitride, the same as in 2, was formed with 800 layers as 4. 5 is a UV cured resin layer which is an adhesive bonding layer, 7F'i is a PC board without grooves, 6 is a slo, 5o on a PC board without grooves.
It is edible with oA film formation.
底膜は全てスパッタリング法でおこなつ友。そして、こ
の光磁気記録層の膜組成は上述のまで固定とし、スパッ
タ条件を変えることにより、保磁力を変えｔ媒体を種々
作成し九〇媒体は全て遷移金属側の磁モーメントをもっ
ている。表１に種々の媒体の保磁力を示す。The bottom film is all done using the sputtering method. Then, the film composition of this magneto-optical recording layer was fixed as described above, and by changing the sputtering conditions, various types of media were created with varying coercive forces, and all of the 90 media had magnetic moments on the transition metal side. Table 1 shows the coercivity of various media.
表 １
媒体Ａ ・・・・・・ ２．０ＫＯｅ
媒体Ｂ ・・・・・・３．０ＫＯｅ
媒体Ｃ・・・・・・ ５−４ＫＯｅ
媒体Ｄ ・・・・・・ ５．５ＫＯｅ
媒体Ｅ ・・・・・・ ４．ｏＫＯｅ
媒体Ｆ ・・・・・・５．０ＫＯｅ
媒体Ｇ ・・・・・・ ７．０ＫＯｅ
媒体Ｈ・・・・・・１０．０ＫＯｅ
これらの媒体の温度特性を見たのが第２図及び第３図で
、第２図は媒体Ｂのカーヒステリシスの温度特性図。第
３図は媒体Ｆのカーヒステリシスの温度特性図である。Table 1 Medium A...2.0KOe Medium B...3.0KOe Medium C...5-4KOe Medium D...5.5KOe Medium E... ... 4. oKOe Medium F...5.0KOe Medium G...7.0KOe Medium H...10.0KOe Figures 2 and 2 show the temperature characteristics of these media. 3, FIG. 2 is a temperature characteristic diagram of Kerr hysteresis of medium B. FIG. 3 is a temperature characteristic diagram of the Kerr hysteresis of the medium F.
媒体Ｂの場合は保磁力が３．０ＫＯｅのものであり、媒
体Ｆの場合は保磁力が５．０ＫＯｅのものであり、この
図をみて明らかなように保磁力ｓ、ｏＫＯｅの媒体Ｂの
温度特性は１５０℃からヒステリシス形状が傾き始め磁
化の消失するキューリ一温度になる壕で傾き続ける。In the case of medium B, the coercive force is 3.0 KOe, and in the case of medium F, the coercive force is 5.0 KOe.As is clear from this figure, the temperature of medium B with coercive force s and oKOe is As for the characteristics, the hysteresis shape begins to slope at 150°C and continues to slope at the Curie temperature, where magnetization disappears.
−万、保磁力５．０ＫＯｅの媒体Ｆの温度特性は高温に
なってもヒステリシスの形状が傾くことはない。これは
定性的に次のように説明することができる。第４図のカ
ーヒステリシス図を用いて説明する。横軸が印加出湯、
縦軸がカー回転角で、ここでは印加磁場が重要となる。-10,000, the temperature characteristics of the medium F with a coercive force of 5.0 KOe have a hysteresis shape that does not tilt even at high temperatures. This can be explained qualitatively as follows. This will be explained using the Kerr hysteresis diagram shown in FIG. The horizontal axis is applied hot water,
The vertical axis is the Kerr rotation angle, and the applied magnetic field is important here.
一般に保磁力というのにＨｅで示ａｎるが、光磁気記録
員体の記録特性においてはＨｓが重要となる。つ１ｔ′
）磁化の向きを反転させる之めに外部から加える必要磁
場ｕ ＨｃではなくＨｇｉで印加しないと十分磁化反転
しないということになる。この点からすると、第２図で
示す保磁力３．０ＫＯｅの媒体ＢＶｉ高温域になっても
Ｈｓは小づくならないｔめ磁化反転のｔめの印加磁場は
大きくなる（いつまでたっても小さくならない）。−万
、保母力５．０ＫＯｅの媒体Ｆ）−ｔヒステリシスが傾
かないため高温域での磁化反転のための印加磁場は小さ
くてすむことになる。このことを定量的にみたのが第５
図及び第６図であり、表１で示した種々の媒体のＨｓの
温度特性図でおる。第５図に示ｆ８はＨｅ ２．ＯＫ
Ｏｓの媒体Ａの温度特性で％ ９ ｎ Ｈｃ ３． Ｏ
Ｋ Ｑ６の媒体ＢＯ温度特性、１０１１ Ｈａ３．４
ＫＯｅの媒体Ｃの＠度特性である。この第４図に示すＨ
ｃが５．４ＫＯｅまでの媒体Ａ、Ｂ、Ｃｔ−ｊ、高温域
（１５０℃以上）になってもＨａが１．５ＫＯｅ程度で
変化がなく、非常に記録・消去しにくい媒体であること
がわかる。Coercive force is generally expressed as He, but Hs is important in the recording characteristics of magneto-optical recording members. tsu1t'
) In order to reverse the direction of magnetization, the magnetization will not be sufficiently reversed unless the required magnetic field u is applied from outside at Hgi instead of Hc. From this point of view, even in the high temperature range of the medium BVi with a coercive force of 3.0 KOe shown in FIG. 2, Hs does not decrease, but the applied magnetic field for the tth magnetization reversal increases (it does not become smaller no matter how long it takes). Since the hysteresis does not tilt, the applied magnetic field for magnetization reversal in a high temperature range can be small. The fifth article looks at this quantitatively.
and FIG. 6, which are temperature characteristic diagrams of Hs of various media shown in Table 1. f8 shown in FIG. 5 is He2. OK
Temperature characteristics of medium A of Os % 9 n Hc 3. O
Medium BO temperature characteristics of K Q6, 1011 Ha3.4
This is the @degree characteristic of medium C of KOe. H shown in this Figure 4
For media A, B, and Ct-j with c up to 5.4 KOe, Ha remains unchanged at around 1.5 KOe even in the high temperature range (150°C or higher), making it extremely difficult to record and erase. Recognize.
一万、第６図に示す１１ Ｉｒｅ Ｈｃ ５．５ＫＯｅ
の媒体りの温度特性で、１２ＨＨｃ４．０ＫＯｅの媒体
Ｅの温度特性、１３Ｕ Ｈａ５．０ＫＯｅの媒体Ｆの温
度特性、１４１”ｊ Ｈｅ ７． ＯＫＯｅの媒体Ｇの
温度特性、 １５ＨＨａ １０．０ ＫＯｅの媒体Ｈ
の温度特性である。この第６図に示すＨｅが３．５ＫＯ
ｅ以上の媒体り、Ｅ、Ｆ、Ｇ、ＨＨ１温度上昇とともに
Ｈｓが減少していき、高温域ではＨｓが十分小てく非常
に記録消去し易い媒体であることがわかる０
さらに、これら表１に示す媒体の動特性（消去特性）を
調べ念のが第７図及び第８図である。10,000, 11 Ire Hc 5.5KOe shown in Figure 6
Temperature characteristics of medium E of 12HHc4.0KOe, temperature characteristics of medium F of 13U Ha5.0KOe, temperature characteristics of medium G of 141"j He 7. OKOe, medium of 15HHa 10.0 KOe H
The temperature characteristics of The He shown in this Figure 6 is 3.5KO
For media of E, F, G, HH1, Hs decreases as the temperature rises, and it can be seen that Hs is sufficiently small in the high temperature range and the medium is very easy to record and erase. FIGS. 7 and 8 show the dynamic characteristics (erasing characteristics) of the medium shown in FIG.
記録・再生の条件ｉｌｊ次に示す通りである。The recording/reproducing conditions ilj are as shown below.
レーザ波長７８０ ｎｍ 、回転数４５Ｏｒｐｍ。Laser wavelength: 780 nm, rotation speed: 45 Orpm.
半径５７ｆｌ、読出しＰｏｗｅｒ １ｍＷ、配分周波数
５００に出。Radius: 57 fl, read power: 1 mW, distribution frequency: 500.
以上、第７図、第８図共通。The above is common to Figures 7 and 8.
第７図の媒体のみ記録磁場７０００ｅｓ記録Ｐｏｗｅｒ
８．ＯｍＷ。Only the medium in Figure 7 has a recording magnetic field of 7000es, recording power
8. OmW.
＠８図の媒体のみ記録磁場１２５０ｅ１記録Ｐｏｗｅｒ
３．２ｍＷ。@8 Recording magnetic field only for the medium in Figure 1250e1 Recording Power
3.2mW.
又、第７図、第８図とも縦軸は消去後の消残り信号をバ
ンド巾１０ＫＨｚ で見７ｔＣ／Ｎ値である。In both FIGS. 7 and 8, the vertical axis represents the 7tC/N value of the residual signal after erasure with a band width of 10 KHz.
そして、横軸は消去Ｐｏｗｅｒである。The horizontal axis is the erasing power.
第７図の媒体の消去磁場は８００Ｑｅ％第８図の消去磁
場に１ｓｏｏｅである。The erase magnetic field of the medium in FIG. 7 is 800Qe% of the erase magnetic field in FIG. 8 by 1 sooe.
まず第７図に示すＢ’ｎ Ｈｅ ２．０ Ｋ Ｏｅの媒
体ａの消去特性で、９′はＨＣ３，ＯＫ Ｏｅの媒体Ｂ
の消去特性、１０’ＨＨａ ３．４ Ｋ Ｏｅの媒体Ｃ
の消去特性である。この第７図に示すＨｃが３．４ＫＯ
ｅまでの媒体Ａ、Ｂ、Ｃは非常に消去しにくい（高パ、
ツー。高磁場が必要）ことがわかる。温度特性をみｔ第
５図とも一致する。First, 9' is the erasing characteristic of medium a of B'n He 2.0 K Oe shown in FIG.
Erasing properties of 10'HHa 3.4 K Oe of medium C
is the cancellation property of The Hc shown in this Figure 7 is 3.4KO
Media A, B, and C up to e are extremely difficult to erase (high-performance,
Two. It can be seen that a high magnetic field is required). Looking at the temperature characteristics, they match those shown in Figure 5.
一万、第８図に示す１１’ｈ Ｈｅ ５．５ Ｋ Ｏｅ
の媒体りの消去特性で、１２’ｔｆ’ｉ Ｈｅ ４．
ＯＫ Ｏｅの媒体Ｅの消去特性、１３’ｉｊ Ｈｅ ５
． ＯＫ Ｏｅの媒体Ｆの消去特性、１４’ＨＨｃ ７
． ＯＫ Ｏｅの媒体Ｇの消去特性、１５’ｌ’ｆｆ
Ｈｃ １０．０ ＫＯｅの媒体Ｈの消去特性である。こ
の第８図に示すＨｃがｓ、５ＫＯｅ以上の媒体り、Ｅ、
Ｆ、Ｇ、Ｈｉ非常に消去し易い（低パワー、低磁場）こ
とがわかり、温度特性をみｔ第６図とも一致する。10,000, 11'h He 5.5 K Oe shown in Figure 8
With the erasing characteristics of the medium, 12'tf'i He 4.
OK Oe erasure characteristics of medium E, 13'ij He 5
．． OK Oe erasure characteristics of medium F, 14'HHc 7
．． OK Oe's erasure characteristics of medium G, 15'l'ff
This is the erasing characteristic of medium H with Hc 10.0 KOe. The medium shown in FIG. 8 has Hc of s, 5KOe or more, E,
It is found that F, G, and Hi are very easy to erase (low power, low magnetic field), and the temperature characteristics match with Figure 6.
以上、本実施例で述べｔ媒体に用いた基板、光磁気記録
層組成、保護膜組成、構造等は一例にすぎず、本実施例
以外以外に例えば、基板にＰＭＭＡ、エポキシ樹脂基板
、ＵＶ樹脂層付きガラス基板を用いても本発明に有効で
あり、光磁気記録層組成も、 Ｎｄ Ｄｙ Ｆｅ Ｃｏ
を組成比が異なったとしても、Ｈｃが３．５ＫＯｅ以上
で６ｎは本発明は有効である。さらに’ｒｂ Ｆｅ Ｃ
ｏ ＋ Ｇｄ Ｔｂ Ｆｅ Ｃｏ ＋Ｔｂ Ｃｏ 、
Ｇｄ Ｔｂ Ｆｅ等の希土類遷移金属合金膜なら全て
に有効である。又、媒体構造も本実施例以外のエアーサ
ンドイッチ構造、片面単板（貼合せなし）ディスクでも
何ら支障ない。又、本発明は透過光を読むファラデー１
式でも、反射光を読むカー７式でも適用できる。The substrate, magneto-optical recording layer composition, protective film composition, structure, etc. used in the medium described in this example are merely examples. The use of a layered glass substrate is also effective in the present invention, and the magneto-optical recording layer composition is also Nd Dy Fe Co
Even if the composition ratio is different, the present invention is effective when Hc is 3.5 KOe or more and 6n. Furthermore, 'rb Fe C
o + Gd Tb Fe Co + Tb Co ,
It is effective for all rare earth transition metal alloy films such as Gd Tb Fe. Further, the medium structure may be an air sandwich structure other than the present embodiment, or a single-sided single-plate (no lamination) disk without any problem. Furthermore, the present invention is based on Faraday 1 that reads transmitted light.
It can also be applied to the Kerr 7 type, which reads reflected light.
以上述べ念ように本発明によれば、常温（２５℃）時で
５．５ＫＯｅ以上の保磁力を有する光磁気記録媒体を作
成することにより、記録・消去に必要なレーザＰｏｗｅ
ｒ、磁場が非常に小さくてすむことになり、装置の消費
電力及び温度上昇が少なくて済むようになつ九０実際、
本発明による媒体を使用した装置では印加磁場１５００
ｅを出ｆ７ｔめに９Ｖ１００ｍＡで十分であり、温度上
昇も１０℃と非常に低くおさえることがでキ念。As mentioned above, according to the present invention, by creating a magneto-optical recording medium having a coercive force of 5.5 KOe or more at room temperature (25°C), the laser power necessary for recording and erasing can be reduced.
r, the magnetic field will be very small, and the power consumption and temperature rise of the device will be low90.In fact,
In a device using a medium according to the invention, an applied magnetic field of 1500
It is important to note that 9V 100mA is sufficient for e to f7t, and the temperature rise can be kept to a very low 10℃.
第１図は、本発明に用い之光磁気記録媒体の断面図。
第２図（ａ）〜（ｇ） ｎ媒体Ｂのカーヒステリンスの
温度特性図。
ｊＪＴ３図（ａ）〜□□□）ニ媒体Ｆのカーヒステリシ
スの温度特性図。
第４図にカーヒステリシス図。
第５図は、Ｈｃ、３．４ＫＯｅ以下の媒体のＨ３の温度
特性図。
第６図は、Ｈｃ ５．５ Ｋ Ｏ’ｅ以上の媒体のＨ３
の温度特性図。
第７図は％ Ｈｃ ５−４ＫＯｅ以下の媒体の消去特性
図０
第８図Ｆｌ ｓ Ｈｃ ５．５ Ｋ Ｏｅ以上の媒体
の消去特性図。
１・・・溝付＠ＰＣ（ポリカーボネート）基板２・・・
窒化アルミニウムと窒化シリコンの複合誘電体膜８００
λ
ｓ ・−・Ｎｄ７ＤＹ２１ Ｆｅｎ５ ＣＯ２？ ａｔ
％の光磁気記録層４００λ
４・・・窒化アルミニウムと窒化シリコンの複合誘電体
膜８００＾
５・・・ＵＶ硬化樹脂層
６・・・Ｓｉｎ、 ５０ ＱＡ
７・・・溝無しＰＣ基板
８・・・）（ｃ２．０ＫＯｅの媒体Ａの温度特性９・・
・Ｈｃ３．０ＫＯｅの媒体Ｂの温度特性１０・・・Ｈｃ
５．４ＫＯｅの媒体Ｃの温度特性１１・・・Ｈｃ３．５
ＫＯｅの媒体りの温度特性１２・・・Ｈｃ４．０ＫＯｅ
の媒体Ｅの温度特性１３・・・）ｉｃ ５． ＯＫＯｅ
の媒体Ｆの温度特性１４・・・ＨＣ７，０ＫＯｅの媒体
Ｇの温度特性１５ ・・・Ｈｃ １０． ＯＫ Ｏｅの
媒体Ｈの温度特性８′・・・Ｈｅ ２． ＯＫ Ｏｅの
媒体Ａの消去特性９′・・・Ｈｃ ３． ＯＫ Ｏｅの
媒体Ｂの消去特性１０’−−−Ｈｃ ３．４ Ｋ Ｏｅ
の媒体Ｃの消去特性１１’・−Ｈｅ ３．５ Ｋ Ｏｅ
の媒体りの消去特性１２′・・・Ｈｅ ４． ＯＫ Ｏ
ｅの媒体Ｅの消去特性１３’−Ｈｅ ５． ＯＫ Ｏｅ
の媒体Ｆの消去特性１４’・・４（ｅ ７． ＯＫ Ｏ
ｅの媒体Ｇの消去特性１５’−Ｈｅ Ｉ Ｇ、 Ｇ Ｋ
Ｏｅの媒体Ｈの消去特性以上
〜７
：＝＝：：＝＝＝＝：：＝＝：＝：＝＝コーＧ〜５゛
・バー］
活 １ 圓
第２図 第３図
第、５″図
第 Ｇ 図FIG. 1 is a sectional view of a magneto-optical recording medium used in the present invention. FIGS. 2(a) to 2(g) are temperature characteristic diagrams of Kerr hysterins of n-medium B. jJT3 Figures (a) to □□□) Temperature characteristic diagram of Kerr hysteresis of two media F. Figure 4 shows the Kerr hysteresis diagram. FIG. 5 is a temperature characteristic diagram of H3 of a medium with Hc and 3.4 KOe or less. Figure 6 shows the H3 of the medium with Hc 5.5 K O'e or more.
temperature characteristic diagram. FIG. 7 is a diagram showing the erasing characteristics of a medium with a % Hc of 5-4 KOe or less; FIG. 8 is a diagram of erasing characteristics of a medium with a Fl s Hc of 5.5 KOe or more. 1... Grooved @PC (polycarbonate) board 2...
Composite dielectric film 800 of aluminum nitride and silicon nitride
λ s ・-・Nd7DY21 Fen5 CO2? at
% magneto-optical recording layer 400λ 4... Composite dielectric film of aluminum nitride and silicon nitride 800^ 5... UV curable resin layer 6... Sin, 50 QA 7... PC board without groove 8...・) (Temperature characteristics of medium A of c2.0KOe 9...
・Temperature characteristics of medium B with Hc 3.0KOe 10...Hc
Temperature characteristics of medium C of 5.4KOe 11...Hc3.5
Temperature characteristics of KOe medium 12...Hc4.0KOe
Temperature characteristics of medium E in 13...)ic 5. OKOe
Temperature characteristics of medium F of 14...HC7.0KOe Temperature characteristics of medium G of 15...Hc 10. OK Temperature characteristics of medium H of Oe 8'...He 2. OK Oe erasing characteristics of medium A 9'...Hc 3. Erasing characteristics of medium B of OK Oe 10'---Hc 3.4 K Oe
Erasing characteristics of medium C 11'・-He 3.5 K Oe
Erasing characteristics of the medium 12'...He 4. OK O
Erasing characteristics of medium E in e 13'-He 5. OK Oe
Erasing characteristics of medium F 14'...4 (e 7. OK O
Erasing characteristics of medium G in e 15'-He I G, G K
Erasing characteristics of medium H of Oe ~ 7 :==::====::==:=:== Cor G ~ 5゛・bar] Active 1 Circle Figure 2 Figure 3, Figure 5'' Figure G
Claims (3)
である光磁気記録層を形成し、前記光磁気記録層に集光
したレーザ光を照射することにより、記録・再生及び消
去をする光磁気記録媒体において、前記光磁気記録層の
保磁力が常温（２５℃）時で３．５ＫＯｅ以上であるこ
とを特徴とする光磁気記録媒体。(1) A magneto-optical recording layer whose main composition is a rare earth transition metal is formed on one side of a transparent substrate, and the magneto-optical recording layer is irradiated with focused laser light to record, reproduce, and erase light. 1. A magnetic recording medium, wherein the magneto-optical recording layer has a coercive force of 3.5 KOe or more at room temperature (25° C.).
、Ｓｍのうちの少なくとも１種類以上の軽希土類金属と
、Ｇｄ、Ｔｂ、Ｄｙのうちの少なくとも、種類以上の重
希土類金属とを含み、かつ遷移金属がＦｅ、Ｃｏのうち
の少なくとも１種類以上を含むことを特徴とする特許請
求の範囲第１項記載の光磁気記録媒体。(2) The rare earth metal among the rare earth transition metals is Nd
, at least one light rare earth metal of Sm, and at least one heavy rare earth metal of Gd, Tb, and Dy, and the transition metal contains at least one of Fe and Co. 2. A magneto-optical recording medium according to claim 1, characterized in that said magneto-optical recording medium comprises:
時において遷移金属側の磁気モーメントを有することを
特徴とする特許請求の範囲第１項記載の光磁気記録媒体
。(3) The composition of the rare earth transition metal at room temperature (25°C)
2. The magneto-optical recording medium according to claim 1, wherein the magneto-optical recording medium has a magnetic moment on the transition metal side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21541386A JPS6370947A (en) | 1986-09-12 | 1986-09-12 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21541386A JPS6370947A (en) | 1986-09-12 | 1986-09-12 | Magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6370947A true JPS6370947A (en) | 1988-03-31 |
Family
ID=16671915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21541386A Pending JPS6370947A (en) | 1986-09-12 | 1986-09-12 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6370947A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63164049A (en) * | 1986-08-22 | 1988-07-07 | Mitsui Petrochem Ind Ltd | Magneto-optical recording medium and its production |
| JPS63173249A (en) * | 1987-01-13 | 1988-07-16 | Daicel Chem Ind Ltd | Magneto-optical recording medium |
-
1986
- 1986-09-12 JP JP21541386A patent/JPS6370947A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63164049A (en) * | 1986-08-22 | 1988-07-07 | Mitsui Petrochem Ind Ltd | Magneto-optical recording medium and its production |
| JPS63173249A (en) * | 1987-01-13 | 1988-07-16 | Daicel Chem Ind Ltd | Magneto-optical recording medium |
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