JPS62241153A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPS62241153A JPS62241153A JP8549886A JP8549886A JPS62241153A JP S62241153 A JPS62241153 A JP S62241153A JP 8549886 A JP8549886 A JP 8549886A JP 8549886 A JP8549886 A JP 8549886A JP S62241153 A JPS62241153 A JP S62241153A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- alloy
- corrosion resistance
- recording medium
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010410 layer Substances 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 239000011241 protective layer Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910001000 nickel titanium Inorganic materials 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 3
- 239000010936 titanium Substances 0.000 claims description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 229910017052 cobalt Inorganic materials 0.000 claims description 10
- 239000010941 cobalt Substances 0.000 claims description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 30
- 238000005260 corrosion Methods 0.000 abstract description 30
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 3
- 229910017061 Fe Co Inorganic materials 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 230000005374 Kerr effect Effects 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- GFISHBQNVWAVFU-UHFFFAOYSA-K terbium(iii) chloride Chemical compound Cl[Tb](Cl)Cl GFISHBQNVWAVFU-UHFFFAOYSA-K 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は光学的記録媒体における光磁気記録用媒体に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magneto-optical recording medium in an optical recording medium.
（従来の技術）
従来、このような分野の技術としては、特開昭５２−３
１７０３号公報、および特開昭５２−１０９１９３号公
報に記載されるものがあった。以下、その構成を説明す
る。(Prior art) Conventionally, as a technology in this field, Japanese Patent Application Laid-Open No. 52-3
There were those described in Japanese Patent Application Laid-open No. 1703 and Japanese Patent Application Laid-open No. 109193/1983. The configuration will be explained below.
従来の光磁気記録用媒体は、希土類−遷移金属非晶質合
金膜（以下、ＲＥ −ＴＨ膜という）からなる光磁気記
録層を、基板上に形成した構造をしている。A conventional magneto-optical recording medium has a structure in which a magneto-optical recording layer made of a rare earth-transition metal amorphous alloy film (hereinafter referred to as RE-TH film) is formed on a substrate.
ここで、ＲＥ−Ｔ）ｌ膜は、具体的にはＩ（Ｅとしてか
トリニウムＧｄ、テルビウム丁す、ジスプロシウムＯｙ
。Here, the RE-T)l film specifically includes I(E), trinium Gd, terbium chloride, dysprosium Oy
.
サマリウムＳｍ等、ＴＨとして鉄ＦｅまたはコバルトＣ
ｏを主成分としている。このＲＥ−ＴＨｒＩｔＡは膜面
に対して垂直な磁化をもつ、いわゆる垂直磁化膜である
。Samarium Sm, etc., iron Fe or cobalt C as TH
The main component is o. This RE-THrItA is a so-called perpendicular magnetization film having magnetization perpendicular to the film surface.
このようなＲＥ−Ｔ１１膜を用いた光磁気記録用媒体は
、１μｍφ程度に絞られたレーザビーム及び外部磁界を
用いた熱磁気書込み方式によって１０８ｂｉｔ ／ｃｒ
Ａというきわめて高密度な記録が可能で、しかも原理的
には無限回に近い消去および再書込みができるという非
常に優れた特長を有する。A magneto-optical recording medium using such a RE-T11 film can be written at 108 bits/cr using a thermomagnetic writing method using a laser beam focused to about 1 μmφ and an external magnetic field.
It has the excellent feature of being able to perform extremely high-density recording (A) and, in principle, to be able to erase and rewrite almost an infinite number of times.
ＲＥ −ＴＨ膜には大きく分けてＲ［−鉄系とＲＥ−コ
バルト系に分類される。RE-TH films are broadly classified into R[-iron type and RE-cobalt type.
ＲＥ−鉄系は、優れた磁気および光磁気特性を有し、し
かも均一な特性分布をつくりやすい。反面、耐食性が非
常に悪く、特に孔食の発生、発達が顕著であるという欠
点を持っている。The RE-iron type has excellent magnetic and magneto-optical properties, and moreover, it is easy to create a uniform property distribution. On the other hand, it has the disadvantage of very poor corrosion resistance, particularly the occurrence and development of pitting corrosion.
一方、Ｒ［−コバルト系は、耐食性の点では滞れている
が、均一特性の膜が得にくく、またキュリ一点が高いた
めに熱磁気書込み特性の点で、ＲＥ−鉄系よりも劣って
いる。On the other hand, the R[-cobalt type is inferior to the RE-iron type in terms of thermomagnetic writing characteristics because it is difficult to obtain a film with uniform characteristics and the Curie point is high, although it is lagging in terms of corrosion resistance. There is.
ＲＥ−鉄系に少量のＣｏを添加することで、耐食性およ
び磁気・光磁気特性の両方を改善できることはよく知ら
れている。ところが、Ｃｏ添加はキュリ一点の急上昇を
ひきおこし、Ｃｏの過度の添加は熱磁気書込みを困難に
するため、少量しか添加できない。少量のＣｏを添加し
たＲ［−鉄−コバルト膜は、磁気および光磁気特性にお
いてＲＥ−鉄系およびＲＥ−コバルト系のいずれよりも
優れている。その反面、耐食性に対してＲＥ−鉄系より
も若干改善されるものの、はなはだ不満足である。そこ
で、保護層を被覆（コート）して耐食性の改善が試みら
れている。It is well known that by adding a small amount of Co to the RE-iron system, both corrosion resistance and magnetic/magneto-optical properties can be improved. However, the addition of Co causes a sudden increase in temperature at a single point, and excessive addition of Co makes thermomagnetic writing difficult, so that only a small amount can be added. The R[-iron-cobalt film with a small amount of Co added is superior to both the RE-iron type and the RE-cobalt type in magnetic and magneto-optical properties. On the other hand, although the corrosion resistance is slightly improved over the RE-iron system, it is still extremely unsatisfactory. Therefore, attempts have been made to improve the corrosion resistance by coating with a protective layer.
（発明が解決しようとする問題点）
上記のＲＥ−鉄膜、ＲＥ−鉄膜コバルト膜は、光磁気材
料として優れた特性を有するものの、耐食性が著しく悪
く、それを防ぐために保護層で被覆することが必要とな
る。(Problems to be Solved by the Invention) Although the above-mentioned RE-iron film and RE-iron cobalt film have excellent properties as magneto-optical materials, their corrosion resistance is extremely poor, and to prevent this, they must be coated with a protective layer. This is necessary.
しかしながら、十分な保護性のある保護層の形成は容易
ではない。例えば、膜厚６００人のＲＥ−鉄膜コバルト
膜を１０００人厚の大義化ケイ素５ｉｎ２、−酸化ケイ
素ＳｉＯまたは窒化ケイ素Ｓｉ３Ｎ４で被覆した場合、
８５℃、８５％相対湿度での５０時間エイジング（ａｇ
ｅｉｎｇ 、放置）で、多数の孔食が発生してしまう。However, it is not easy to form a protective layer with sufficient protective properties. For example, when a RE-iron cobalt film with a thickness of 600 mm is coated with 5 in 2 of silicon oxide, - silicon oxide SiO, or silicon nitride Si3N4 with a thickness of 1000 mm,
Aging for 50 hours at 85°C and 85% relative humidity (ag
(eing, left unattended), a lot of pitting corrosion occurs.
耐食性を改善する他の方法としてｌ？Ｅ−１Ｍ膜に種々
の元素を添付することも行われている。ところが、種々
の元素の添加によって磁気・光磁気特性が劣化すること
が多いため、該元素の添加を少量に抑える必要があり、
十分な耐食性が得られないことが多い。Other ways to improve corrosion resistance? Various elements have also been added to E-1M films. However, since the addition of various elements often deteriorates the magnetic and magneto-optical properties, it is necessary to keep the addition of these elements to a small amount.
Sufficient corrosion resistance is often not achieved.
このように、光磁気材料として優れた特性を有するＲＥ
−鉄膜、ＲＥ−鉄膜コバルト膜の耐食性改善方法として
、保護層及び添加元素のいずれも十分に満足のゆくもの
でなかった。In this way, RE has excellent properties as a magneto-optical material.
-Iron film, RE-Iron film As a method for improving the corrosion resistance of a cobalt film, neither the protective layer nor the additive elements were fully satisfactory.
本発明は、前記従来技術が持っていた問題点のうち、十
分な耐食性と良好な磁気・光磁気特性を合せ持った光磁
気記録用媒体を得ることが困難である点について解決し
た光磁気記録用媒体を提供するものである。The present invention provides magneto-optical recording that solves the problems of the prior art, namely that it is difficult to obtain a magneto-optical recording medium that has both sufficient corrosion resistance and good magnetic and magneto-optical properties. It provides a medium for use.
（問題点を解決するための手段）
本発明は前記問題点を解決するために、基板上に少なく
とも光磁気記録層を形成すると共にその光磁気記録層を
保護する保護層を形成した光磁気記録用媒体において、
前記光磁気記録層は、ＲＥ−Ｈｔ−Ｎｉ−Ｔｉ系合金で
形成する。しかも、前記ＲＥは前記ＲＥ−８１−Ｎｉ−
Ｔｉ系合金全体量の１８〜３５原子％含有して１種また
は２種以上の希土類元素とし、前記Ｈ１はＦｅまたはＦ
ｅ−Ｃｏ合金で、かつ該Ｃｏの含有量は前記（Ｍ１＋Ｎ
ｉ十刊）全体量の２０原子％以下とする。さらに、前記
Ｎｉは前記（Ｍ１＋Ｎｉ＋Ｔｉ）全体量の１０〜２０原
子％含有するニッケルで、前記Ｔｉは前記（Ｍｆｌ＋Ｎ
ｉ＋Ｔｉ ）全体量の２〜１０原子％含有するチタンで
、それぞれ構成したものである。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a magneto-optical recording device in which at least a magneto-optical recording layer is formed on a substrate and a protective layer is formed to protect the magneto-optical recording layer. In the medium for
The magneto-optical recording layer is made of a RE-Ht-Ni-Ti alloy. Moreover, the RE is the RE-81-Ni-
The Ti-based alloy contains 18 to 35 at% of the total amount of one or more rare earth elements, and H1 is Fe or F.
e-Co alloy, and the Co content is as described above (M1+N
(10th edition) 20 atomic% or less of the total amount. Further, the Ni is nickel containing 10 to 20 at% of the total amount of the (M1+Ni+Ti), and the Ti is the (Mfl+N
i+Ti) Each is composed of titanium containing 2 to 10 atomic % of the total amount.
（作 用）
本発明によれば、以上のように光磁気記録用媒体を構成
したので、光磁気記録層は、耐食性に優れた記録の安定
性向上と書込み、再生特性の経時的劣化の抑制を計ると
共に、保護層に対する制限、要求を緩和するように働く
。従って前記問題点を除去できるのである。(Function) According to the present invention, since the magneto-optical recording medium is constructed as described above, the magneto-optical recording layer has excellent corrosion resistance, improves recording stability, and suppresses deterioration of writing and reproducing characteristics over time. It also works to reduce restrictions and demands on the protective layer. Therefore, the above-mentioned problem can be eliminated.
（実施例）
第１図は本発明の実施例を示す光磁気記録用媒体の概略
断面図である。(Example) FIG. 1 is a schematic cross-sectional view of a magneto-optical recording medium showing an example of the present invention.
この光磁気記録用媒体は、透明度が高くかつ光学特性の
良いガラス板、あるいは樹脂板からなる基板１を有し、
その基板１上には、誘電体層２、光磁気記録層３、及び
保護層４が順次積層状態に形成されている。This magneto-optical recording medium has a substrate 1 made of a glass plate or a resin plate with high transparency and good optical properties,
On the substrate 1, a dielectric layer 2, a magneto-optical recording layer 3, and a protective layer 4 are sequentially laminated.
誘電体層２は、カー効果エンハンスメントの働きをもつ
もので、例えば膜厚８００人のＳｉＯ等で形成されてい
る。The dielectric layer 2 has the function of enhancing the Kerr effect, and is formed of, for example, SiO or the like with a thickness of 800 nm.
光磁気記録層３は、例えば膜厚１ｏｏｏへのＲＥ −Ｔ
Ｈ膜で構成されている。ＲＥ−Ｔ）ｌ膜はＲＥ −Ｈｌ
−Ｎ １−Ｔｉ系合金で作られている。ここで、ＲＥ
４．ｔＴｂ等の希土類元素で、その量をＲＥ−ト＋ｉ−
＋１ｉ−ｒ；系合金全体量の１８〜３５原子％とする。The magneto-optical recording layer 3 is formed by RE-T to a film thickness of 100 mm, for example.
It is composed of H film. RE-T)l membrane is RE-Hl
-Made of 1-Ti alloy. Here, RE
4. With rare earth elements such as tTb, the amount can be reduced by
+1i-r: 18 to 35 atomic % of the total amount of the system alloy.
ＨｌはＦｅまたはＦｅ−Ｃｏ合金であり、その量を（Ｒ
Ｅ＋Ｎｉ十Ｔｉ ）の残量とし、そのうちＣｏの含有母
は（Ｍ１＋Ｎｉ＋Ｔｉ ）全体量の２０原子％以下とす
る。Ｎｉは（Ｍ１＋Ｎｉ＋１ｉ ＞全体量の１０〜２０
原子％含有している。Ｔｉは（Ｍ１＋Ｎｉ＋Ｔｉ ）全
体量の２〜１０原子％含有している。Hl is Fe or Fe-Co alloy, and its amount is expressed as (R
The remaining amount is E+Ni+Ti), of which the Co content is 20 atomic % or less of the total amount (M1+Ni+Ti). Ni is (M1+Ni+1i > 10 to 20 of the total amount
Contains atomic%. Ti is contained in an amount of 2 to 10 atomic % based on the total amount of (M1+Ni+Ti).
ＲＥ−ＴＩ−１膜は、例えば次表のような試料Ｎｏ、
１〜＋ｑｏ、 ５で構成されている。なお、比較のため
に試料Ｎｏ、 ５〜Ｎｏ、 １０も合せて示されている
。For example, the RE-TI-1 film can be prepared using sample No. as shown in the following table.
Consists of 1~+qo, 5. Note that samples No. 5 to No. 10 are also shown for comparison.
表
光磁気記録層３を被覆する保護層４は、例えば膜厚１０
００人のＳｉＯ膜等で形成されている。The protective layer 4 covering the surface magneto-optical recording layer 3 has a film thickness of, for example, 10
It is formed of 00000000000000000000000000000000000000000000000000000000000000 SiO films.
（１）磁気・光磁気特性
以上のように構成された光磁気記録用媒体を用いて光磁
気記録ディスクを作り、そのディスクの回転数を９０Ｏ
ｒｐｍ、該ディスク面に照射する半導体レーデ光を６ｍ
ｗ以下とした場合、１μｍ程度の微小記録を得、ざらに
１０万回以上の消去および再書込みの反復に耐えること
が確認できた。(1) Create a magneto-optical recording disk using a magneto-optical recording medium configured as described above, and rotate the disk at a rotation speed of 90O
rpm, and the semiconductor radar light irradiated to the disk surface is 6 m.
It was confirmed that when the temperature was less than W, minute recordings of about 1 μm were obtained, and it could endure repeated erasing and rewriting more than 100,000 times.
（２）カー回転角特性
第２図は本実施例における光磁気記録用媒体のカー回転
角の実験結果を示す。縦軸のカー回転角θ６は、試料Ｎ
ｏ、６におけるカー回転角θｋｏを基準とした比で示さ
れている。(2) Kerr rotation angle characteristics FIG. 2 shows the experimental results of the Kerr rotation angle of the magneto-optical recording medium in this example. The Kerr rotation angle θ6 on the vertical axis is the sample N
It is expressed as a ratio based on the Kerr rotation angle θko at o, 6.
第２図に示されるように、１０原子％以下のＴｉ添加で
はカー回転角にほとんど悪影響を及ぼさない。As shown in FIG. 2, addition of Ti at 10 atomic % or less has almost no adverse effect on the Kerr rotation angle.
一方、Ｎｉはカー回転角をわずかに減少させるが、その
減少率は小さい。従って本実施例の範囲内のＮｉ、 Ｔ
ｉの添加では、カー回転角の減少は少なく、また誘電体
層２によるカー効果エンハンスメントによってカー回転
角を増加させることができるため、実用上全く問題ない
。On the other hand, although Ni slightly decreases the Kerr rotation angle, the rate of decrease is small. Therefore, Ni, T within the scope of this example
When i is added, the decrease in the Kerr rotation angle is small and the Kerr rotation angle can be increased by enhancing the Kerr effect by the dielectric layer 2, so there is no problem in practice.
（３）耐食性特性
一方、耐食性の実験結果を第３図（１）、 （２）に示
す。第３図（１）は試料Ｎｏ、１〜Ｎｏ、 １０を８５
°Ｃ１８５％相対湿度雰囲気中に保持した後の孔食発生
による光透過率変化を示し、また第３図（２）は同試料
Ｎ０９１〜Ｎ００１０を１規定Ｎａｃｕ水溶液中に浸漬
した時の光透過率変化を示す。(3) Corrosion resistance characteristics On the other hand, the experimental results of corrosion resistance are shown in Fig. 3 (1) and (2). Figure 3 (1) shows sample No. 1 to No. 10 as 85.
Figure 3 (2) shows the light transmittance change due to pitting corrosion after being kept in an atmosphere of 185% relative humidity at °C, and the light transmittance when the same samples N091 to N0010 were immersed in a 1N Nacu aqueous solution. Show change.
第３図において、本実施例の試料Ｎｏ、１〜Ｎｏ、５は
耐食性に優れていることがわかる。これと比較されるＴ
ｉ添加合金膜の試料Ｎｏ、 ９、Ｎｏ、 １０、及びＮ
ｉ添加合金膜のＮｏ、７、Ｎｏ、Ｆ３は、いずれも試料
Ｎ０１６に比べて耐食性が大きい。特に、Ｔｉ添加合金
膜の試料Ｎｏ、９、Ｎｏ、 １０は、８５°Ｃ１８５％
相対湿度中では本実施例の試料Ｎｏ、 １、Ｎｏ、 ５
に匹・敵する耐食性を有する。しかし、ＮａＣ，ｌＪ水
溶液中においては本実施例の試料Ｎｏ、 １〜Ｎ００５
が耐食性の点で格段に優れている。Ｔｉは１０％よりも
多く添加すれば、ＮａＣρ水溶液、及び８５℃、８５％
相対湿度雰囲気中のいずれにおいても、非常に優れた耐
食性を有する。しかし、Ｔｉを多量に添加すると、光磁
気記録用媒体の光磁気特性を劣化させる。In FIG. 3, it can be seen that samples No. 1 to No. 5 of this example have excellent corrosion resistance. T compared to this
Samples No. 9, No. 10, and N of i-added alloy films
The i-added alloy films No. 7, No. 7, and F3 all have higher corrosion resistance than sample No. 016. In particular, samples No. 9, No. 10 of Ti-added alloy films were heated at 85°C 185%.
In the relative humidity, samples No. 1, No. 5 of this example
It has corrosion resistance comparable to that of However, in the NaC, lJ aqueous solution, samples No. 1 to N005 of this example
is significantly superior in terms of corrosion resistance. If more than 10% of Ti is added, NaCρ aqueous solution and 85°C, 85%
It has excellent corrosion resistance in any relative humidity atmosphere. However, adding a large amount of Ti deteriorates the magneto-optical characteristics of the magneto-optical recording medium.
２〜１０％のＴｉ添加であれば、光磁気特性の変化はほ
とんどなく、しかも８５°Ｃ１８５％相対湿度では優れ
た耐食性を示す。しかし、Ｎａｃρ水溶液においては、
生母の１１添加は効果が少なく、５％程度以上の添加か
ら急激に効果か増大する。従って２〜５％のＴｉ添加媒
体は、Ｎａｃｆ） ＊溶液中では耐食性か小さく、また
、５〜１０％の添加でも刊分布の不均一性等を考慮する
と不安がある。When Ti is added in an amount of 2 to 10%, there is almost no change in magneto-optical properties, and excellent corrosion resistance is exhibited at 85° C. and 185% relative humidity. However, in the Nacρ aqueous solution,
The effect of adding 11 to the raw mother is small, and the effect increases rapidly from addition of about 5% or more. Therefore, a medium containing 2 to 5% Ti has low corrosion resistance in a Nacf) solution, and even if it is added at a concentration of 5 to 10%, there are concerns when considering the non-uniformity of the Ti distribution.
一方、Ｎｉは耐食性改善効果がＴｉよりもかなり劣るが
、ＮａＣρ水溶液において添加量に比例した耐食性を示
す。モのため、刊とＮｉの両方を添加することで、８５
°Ｃ１８５％相対湿度雰囲気、及びＮａｃｆｌ水溶液い
ずれにおいても、高耐食性を示すようになる。On the other hand, although Ni has a much lower corrosion resistance improvement effect than Ti, it exhibits corrosion resistance proportional to the amount added in an NaCρ aqueous solution. By adding both Ni and Ni, 85
It exhibits high corrosion resistance both in a 185% relative humidity atmosphere at °C and in a Nacfl aqueous solution.
本発明は上記実施例に限定されず、種々の変形が可能で
おる。その変形例として例えば次のようなものか必る。The present invention is not limited to the above embodiments, and various modifications are possible. Examples of variations include the following.
（ｉ） ＲＥ−用膜３におけるＲＥは、希土類として丁
すを用いたか、これに限定されるものではなく、Ｔｂ。(i) RE in the RE film 3 uses Tb as the rare earth element, but is not limited to this.
ＤＶ、 Ｇｄ、Ｎｄ、 Ｓｍ等の１種または２種以上の
希土類を用いた場合でも、旧、「ｉの添加の効果は上記
実施例と同様に有効である。Even when one or more rare earth elements such as DV, Gd, Nd, and Sm are used, the effect of adding i is as effective as in the above embodiment.
（ｉｉ） 光磁気記録用媒体の断面４ｆＳ’ｒ告は、
第１図のものに限定されず、例えば基板１と光磁気記録
層３との間に誘電体１葭２かない構造ておっても良い。(ii) The cross section 4fS'r of the magneto-optical recording medium is:
The structure is not limited to that shown in FIG. 1, and for example, a structure in which there is no dielectric material 1 and 2 between the substrate 1 and the magneto-optical recording layer 3 may be used.
また、保護層４の上に接着層を介してカバー基板を貼着
した構造等、種々の変形例に本発明のＲＥ−Ｍｌ−Ｎｉ
−Ｔｉ系合金を適用できる。In addition, the RE-Ml-Ni of the present invention can be applied to various modifications such as a structure in which a cover substrate is attached on the protective layer 4 via an adhesive layer.
-Ti-based alloys can be applied.
（発明の効果〉
以上詳細に説明したように、本発明によれば、光磁気記
録層をＲＥ−８１−Ｎｉ−Ｔｉ系合金で構成したので、
光磁気特性をほとんど劣化させずに、高耐食性を得るこ
とかできる。この耐食性の向上に起因して記録の安定性
が著しく良くなり、書込み、再生特性の経時的劣化も抑
制できる。さらに、保書層に対する制限や要求も著しく
緩和され、光磁気記録用媒体の分留りも向上し、従って
媒体コストの低減化という効果も期待できる。(Effects of the Invention) As explained in detail above, according to the present invention, since the magneto-optical recording layer is made of an RE-81-Ni-Ti alloy,
High corrosion resistance can be obtained with almost no deterioration of magneto-optical properties. Due to this improvement in corrosion resistance, recording stability is significantly improved, and deterioration of writing and reproducing characteristics over time can also be suppressed. Furthermore, the restrictions and demands on the security layer are significantly relaxed, the fractional retention of the magneto-optical recording medium is improved, and the effect of reducing the cost of the medium can also be expected.
第１図は本発明の実施例を示す光磁気記録用媒体の概略
断面図、第２図はカー回転角の実験結果を示す図、第３
図（１）、 （２）は耐食性の実験結果を示す図である
。
１・・・・・・基板、２・・・・・・誘電体層、３・・
・・・・光磁気記録層、４・・・・・・保護層。
出願人代理人 柿 本 恭 成力−回転角の実
験結果
第２図
皐慴製４停FIG. 1 is a schematic cross-sectional view of a magneto-optical recording medium showing an example of the present invention, FIG. 2 is a diagram showing experimental results of Kerr rotation angle, and FIG.
Figures (1) and (2) are diagrams showing the experimental results of corrosion resistance. 1...Substrate, 2...Dielectric layer, 3...
...Magneto-optical recording layer, 4...Protective layer. Applicant's representative: Kakimoto Seiriki - Experimental results of rotation angle Figure 2: 4-stop manufactured by Kokei
Claims (1)
光磁気記録層を保護する保護層を形成した光磁気記録用
媒体において、 前記光磁気記録層は、ＲＥ−Ｍ１−Ｎｉ−Ｔｉ系合金で
形成し、 さらに、前記ＲＥは前記ＲＥ−Ｍ１−Ｎｉ−Ｔｉ系合金
全体量の１８〜３５原子％含有して１種または２種以上
の希土類元素とし、 前記Ｍ１は鉄Ｆｅまたは鉄Ｆｅ−コバルトＣｏ合金で、
かつ該コバルトＣｏの含有量は前記（Ｍ１＋Ｎｉ＋Ｔｉ
）全体量の２０原子％以下とし、 前記Ｎｉは前記（Ｍ１＋Ｎｉ＋Ｔｉ）全体量の１０〜２
０原子％含有するニッケルで、 前記Ｔｉは前記（Ｍ１＋Ｎｉ＋Ｔｉ）全体量の２〜１０
原子％含有するチタンで、 それぞれ構成したことを特徴とする光磁気記録用媒体。[Scope of Claim] A magneto-optical recording medium comprising at least a magneto-optical recording layer formed on a substrate and a protective layer for protecting the magneto-optical recording layer, wherein the magneto-optical recording layer is made of RE-M1-Ni. - formed of a Ti-based alloy; further, the RE contains one or more rare earth elements in an amount of 18 to 35 atomic % of the total amount of the RE-M1-Ni-Ti-based alloy, and the M1 is iron Fe; Or iron Fe-cobalt Co alloy,
And the cobalt Co content is as described above (M1+Ni+Ti
) 20 at% or less of the total amount, and the Ni accounts for 10 to 2 of the total amount of (M1+Ni+Ti).
nickel containing 0 at%, and the Ti accounts for 2 to 10 of the total amount of (M1+Ni+Ti).
A magneto-optical recording medium characterized in that it is composed of titanium containing atomic percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8549886A JPS62241153A (en) | 1986-04-14 | 1986-04-14 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8549886A JPS62241153A (en) | 1986-04-14 | 1986-04-14 | Magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62241153A true JPS62241153A (en) | 1987-10-21 |
Family
ID=13860597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8549886A Pending JPS62241153A (en) | 1986-04-14 | 1986-04-14 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62241153A (en) |
-
1986
- 1986-04-14 JP JP8549886A patent/JPS62241153A/en active Pending
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