JPS62239447A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPS62239447A JPS62239447A JP61083356A JP8335686A JPS62239447A JP S62239447 A JPS62239447 A JP S62239447A JP 61083356 A JP61083356 A JP 61083356A JP 8335686 A JP8335686 A JP 8335686A JP S62239447 A JPS62239447 A JP S62239447A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- film
- alloy
- corrosion resistance
- 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
- 239000010936 titanium Substances 0.000 claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052796 boron Inorganic materials 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 239000010410 layer Substances 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 239000011241 protective layer Substances 0.000 claims description 13
- 229910017052 cobalt Inorganic materials 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 229910000531 Co alloy Inorganic materials 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 3
- 229910017061 Fe Co Inorganic materials 0.000 abstract description 2
- 230000032683 aging Effects 0.000 abstract description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 abstract description 2
- 229910052723 transition metal Inorganic materials 0.000 abstract description 2
- 230000001668 ameliorated effect Effects 0.000 abstract 1
- 150000002910 rare earth metals Chemical class 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005374 Kerr effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 230000003287 optical effect Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 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
- 229910005091 Si3N Inorganic materials 0.000 description 1
- 229910052581 Si3N4 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
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 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
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide 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
- 238000002834 transmittance Methods 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 (Industrial Field of 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めった。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
The ones described in Japanese Patent Application Laid-Open No. 1703 and Japanese Patent Application Laid-Open No. 109193/1980 were found. 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 −ＴＭ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-TM film) is formed on a substrate.
ここで、ＲＥ −ＴＨＦＪは、具体的にはＲＥとしてガ
トリニ１クムＧｄ、テルヒ゛ウム丁す、ジスプロシウム
ＤＶ。Here, RE-THFJ specifically refers to REs such as gatlinium cum Gd, terium chloride, and dysprosium DV.
サマリウム３ｍ等、ＴＭとして鉄「ｅまたはコバルトＣ
。Samarium 3m, etc., iron "e" or cobalt C as TM
.
を主成分としている。このＲＥ−１Ｍ膜は膜面に対して
垂直な磁化をもつ、いわゆる垂直磁化膜である。is the main component. This RE-1M film is a so-called perpendicular magnetization film having magnetization perpendicular to the film surface.
このようなＲＥ−１Ｍ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 ／−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-1M film is
Using a thermomagnetic writing method that uses a laser beam narrowed to about 1 μmφ and an external magnetic field, it is possible to record at an extremely high density of 108 bits/-, and in principle it can be erased and rewritten nearly infinite times. It has excellent features.
ＲＥ−１Ｍ膜には大きく分けてｆ？Ｅ−鉄系とＲＥ−コ
バルト系に分類される。RE-1M membrane can be broadly divided into f? It is classified into E-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、ＲＥ−コバルト系は、耐食性の点では優れている
か、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 RE-cobalt type is inferior to the RE-iron type in terms of thermomagnetic writing characteristics because it is superior in corrosion resistance, it is difficult to obtain a film with uniform characteristics, and the Curie point is high.
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λ０
られている。ところが、Ｃｏ添加はキュリ一点の急上背
をひさおこし、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ＲＥ−鉄膜コバルト膜は、磁気および光磁気特性に
おいてＲＥ−鉄系およびＲＥ−コハル１−系のいずれよ
りも優れている。その反面、耐食性に対しては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 adding a small amount of Co to the RE-iron system can improve both corrosion resistance and magnetic/magneto-optical properties.
It is being However, the addition of Co causes a sharp increase in height, and excessive addition of Co makes thermomagnetic writing difficult, so that only a small amount can be added. The RE-iron cobalt film doped with a small amount of Co has better magnetic and magneto-optical properties than either the RE-iron system or the RE-Kohal 1-system. 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.
（発明か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。(Problem to be solved by the invention) Although the above 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−コバルト
膜を１０００人厚の二酸化ケイ素５ｉ０２、−ｍ化ケイ
素ＳｉＯまたは窒化ケイ素Ｓｉ３Ｎ。で被覆した場合、
８５°Ｃ１８５％相対湿度での５０時間エイジング（ａ
ｇｅｉｎｇ 、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, a 600mm thick RE-iron-cobalt film, a 1000mm thick silicon dioxide 5i02, -m-silicon SiO or silicon nitride Si3N. When coated with
Aging for 50 hours at 85°C and 185% relative humidity (a
If left unattended, a large amount of pitting corrosion will occur.
耐食性を改善する他の方法としてＲＥ−Ｔ）！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ｉｑられないことか多い。Another way to improve corrosion resistance is RE-T)! Attaching various elements to the membrane has also been done. 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−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
ではなかった。In this way, RE has excellent properties as a magneto-optical material.
- As methods for improving the corrosion resistance of iron films and RE-iron-cobalt films, 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−Ｔｉ−Ｍｌ−８２系合金で
形成する。しかも、前記ＲＥは前記（ＲＥ＋Ｔｉ＋Ｍｌ
）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Ｔｉは前記（ＲＥ＋Ｔｉ十Ｍ
ｌ）全体量の２〜１５原子％含有するチタンでそれぞれ
構成する。さらに、前記Ｍ１は鉄「ｅ元素、コバルトＣ
ｏ元素、またはＦｅ−Ｃｏ合金で、前記Ｍ２は前記ＲＥ
−Ｔｉ−Ｈ１−Ｈ２系合金全体量の４〜１０原子％含有
し、かつホウ素Ｂ、炭素Ｃ、ケイ素Ｓｉ、リンＰの少な
くとも１種以上の元素で、それぞれ構成したしたもので
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-Ti-Ml-82 alloy. Moreover, the RE is the (RE+Ti+Ml
) Contains 18 to 35 at% of the total amount as one or more rare earth elements, and the Ti is the (RE + Ti + M
l) Each is composed of titanium containing 2 to 15 at% of the total amount. Furthermore, the above M1 is iron "e element, cobalt C
o element or a Fe-Co alloy, and the M2 is the RE
-Ti-H1-H2 alloy contains 4 to 10 atomic % of the total amount of the alloy, and is composed of at least one element of boron B, carbon C, silicon Si, and phosphorus P, respectively.
（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、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、１［に対する制限、要求を緩和するように動
く。従って前記問題点を除去できるので必る。(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. At the same time, we will move to ease the restrictions and demands on 1[. Therefore, it is necessary because 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−ＴＨ
膜で構成されている。ＲＥ −ＴＭ膜はＲＥ −Ｔ ｉ
−Ｍｌ −）１２系合金でつくられている。ここで、
ＲＥはＴｂ等の希土類元素で、その量を（ＲＥ＋Ｔｉ＋
Ｍ１）全体量の１８〜３５原子％とする。Ｔｉの量は（
ＲＥ＋Ｔｉ＋Ｍ１）全体量の２〜１５原子％とする。Ｈ
ｌはＦｅ元素、Ｃｏ元素、ｔｆハＦｅ−Ｃｏ合金とする
。また、Ｈ２は、Ｂ、Ｃ１Ｓｉ、 Ｐの少なくとも１種
以上の元素であり、その量をＲＥ−Ｔｉ−Ｍｌ−）１２
系合金全体量の４〜１０原子％とする。The magneto-optical recording layer 3 is formed by RE-TH to a film thickness of 100 mm, for example.
It is composed of a membrane. The RE-TM film is RE-T i
-Ml-)12 series alloy. here,
RE is a rare earth element such as Tb, and its amount is (RE+Ti+
M1) 18 to 35 at% of the total amount. The amount of Ti is (
RE+Ti+M1) 2 to 15 at% of the total amount. H
1 is Fe element, Co element, and tf is Fe--Co alloy. Furthermore, H2 is at least one element of B, C1Si, and P, and the amount thereof is expressed as RE-Ti-Ml-)12
The content is 4 to 10 at% of the total amount of the alloy.
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Ｓ ＋ ０２膜等で形成されている。The protective layer 4 covering the magneto-optical recording layer 3 has a film thickness of, for example, 10
00's S+02 film or the like.
（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ザ光を５ｍ
ｗ以下とした場合、１μｍ程度の微小記録を得、さらに
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 laser beam irradiated to the disk surface is 5 m.
It was confirmed that when the temperature was less than W, minute recordings of about 1 μm were obtained, and furthermore, it could endure repeated erasing and rewriting more than 100,000 times.
（２）耐食性
一方、耐食性に対しては、刊とＭ２を両方添加したこと
により、非常に良好な耐食性を示す。(2) Corrosion resistance On the other hand, with regard to corrosion resistance, very good corrosion resistance was exhibited by adding both M2 and M2.
第２図は、本実施例における次表のような試料Ｎｏ、４
〜Ｎｏ、 １０を８５°Ｃ１８５％相対湿度雰囲気に保
持した後の孔食発生による光透過率変化を示したもので
ある。比較のために光磁気記録層３を、ＴｉおよびＭ２
のない試料Ｎｏ、１、Ｔｉのない試料ＮＯ，２、Ｈ２の
ない試料Ｎｏ、 ３も合せて示しである。Figure 2 shows sample No. 4 in this example as shown in the following table.
This figure shows the change in light transmittance due to the occurrence of pitting corrosion after No. 10 was maintained in an atmosphere of 85° C. and 185% relative humidity. For comparison, the magneto-optical recording layer 3 was made of Ti and M2.
Sample No. 1 without Ti, sample No. 2 without Ti, and sample No. 3 without H2 are also shown.
第２図から明らかなように、従来の試料Ｎｏ、３のよう
にＴｉのみの添加でもかなりの耐食性を示すが、本実施
例の試料Ｎｏ、４〜Ｎｏ、 １０ではＭ２の添加で、さ
らに耐食性が向上することがわかる。また、試料Ｎｏ、
１〜Ｎｏ、１０をＳｉＯ保護層４で被覆した場合、裸
のときよりも著しく耐食性に優れているが、保護層４の
微小欠陥からの腐食は避けられない。As is clear from Fig. 2, although the conventional samples No. 3 exhibit considerable corrosion resistance even when only Ti is added, the samples No. 4 to No. 10 of this example exhibit even greater corrosion resistance with the addition of M2. It can be seen that the results are improved. In addition, sample No.
When No. 1 to No. 10 are coated with the SiO protective layer 4, the corrosion resistance is significantly superior to that when they are bare, but corrosion from minute defects in the protective layer 4 is unavoidable.
そのため、従来の試料Ｎｏ、 ’ｌ 、Ｎｏ、２ではか
なりの腐食がおこってしまう。Therefore, considerable corrosion occurs in the conventional samples No. 1, No. 2, and No. 2.
（３）カー回転角
カー回転角に関して、１１の添加は２〜８％まではほと
んど悪影響を与えないが、それ以上加えると該カー回転
角が徐々に減少する。一方、Ｍ２の添加はカー回転角の
減少をおこす。しかし、耐食性はＴｉ、８２を加えるほ
ど向上する。従って目的に合せてＴｉ、Ｈ２の添加但を
選択すれば良い。また、Ｔｉ、Ｈ２の添加によるカー回
転角の減少は、本実施例の添加範囲であれば少なく、し
かも誘電体層２によるカー効果エンハンスメントを利用
してカー回転角を増大さけることができるので、実用上
は全く問題ない。むしろ耐食性向上による利点がより大
きい。(3) Kerr rotation angle Regarding the Kerr rotation angle, the addition of 11 has almost no adverse effect up to 2 to 8%, but if more is added, the Kerr rotation angle gradually decreases. On the other hand, addition of M2 causes a decrease in Kerr rotation angle. However, the corrosion resistance improves as more Ti, 82 is added. Therefore, the addition of Ti and H2 may be selected depending on the purpose. Further, the decrease in the Kerr rotation angle due to the addition of Ti and H2 is small within the addition range of this example, and the increase in the Kerr rotation angle can be avoided by utilizing the Kerr effect enhancement by the dielectric layer 2. There is no problem at all in practice. Rather, the advantage of improved corrosion resistance is greater.
本実施例における耐食性向上の理由としては、次のよう
なことが考えられる。The following may be considered as the reason for the improvement in corrosion resistance in this example.
（ａ） Ｈ２を含む合金は速い活性溶解がおこり、不働
態皮膜を形成するのに有効な［ｉを合金と腐食環境の界
面に迅速に濃縮し、Ｔｉの濃縮率の高い不働態皮膜を迅
速に形成させる。(a) Alloys containing H2 undergo rapid active dissolution, rapidly concentrating [i] at the interface between the alloy and the corrosive environment, which is effective for forming a passive film, and rapidly forming a passive film with a high concentration of Ti. to form.
（ｂ） ［２の中でＰとＣは、ざらにそのＴｉ不働態皮
膜中に入り込むことがなく、特に滑れたＴｉ不働態皮膜
を形成する。(b) In [2], P and C do not penetrate roughly into the Ti passive film, forming a particularly slippery Ti passive film.
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がある。The present invention is not limited to the above embodiments, and various modifications are possible. Examples of such modifications include the following.
（ｉ） ＲＥ−ＴＨ３におけるＲＥは、希土類としてＴ
Ｉｂを用いたが、これに限定されるものではな（、Ｔｂ
、 ＤＶ。(i) RE in RE-TH3 is T as a rare earth element.
Ib was used, but it is not limited to this (, Tb
, 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、Ｔｉ、８２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 Gd, Nd, and Sm are used, the effect of adding Ti and 82 is as effective as in the above embodiment.
（ｉｉ） 光磁気記録用媒体の断面構造は、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
間に誘電体層２がない構造であってもよい。(ii) The cross-sectional structure of the magneto-optical recording medium is not limited to that shown in FIG. 1, and may be, for example, a structure in which there is no dielectric layer 2 between the substrate 1 and the magneto-optical recording layer 3.
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−Ｔｉ−）１
１−Ｍ２系合金を適用できる。Moreover, the RE-Ti-) 1 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.
1-M2 alloy 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、光磁気配
Ｂ層をＲＥ−Ｔｉ −Ｍｌ−８２系合金で構成したので
、耐食性か著しく向上する。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、保護層に対する制限
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 described in detail above, according to the present invention, since the magneto-optical B layer is made of a RE-Ti-Ml-82 alloy, the corrosion resistance is significantly improved. 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 protective layer are significantly relaxed, the fractional yield 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。FIG. 1 is a schematic cross-sectional view of a magneto-optical recording medium showing an example of the present invention, and FIG. 2 is a diagram showing experimental results of corrosion resistance. 1...Substrate, 2...Dielectric layer, 3...
...Magneto-optical recording layer, 4...Protective layer.
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−Ｔｉ−Ｍ１−Ｍ２系合金で
形成し、 さらに、前記ＲＥは前記（ＲＥ＋Ｔｉ＋Ｍ１）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Ｔｉは前記は（ＲＥ＋Ｔｉ＋Ｍ１）全体量の２〜１
５原子％含有するチタンで、 前記Ｍ１は鉄Ｆｅ元素、コバルトＣｏ元素、またはＦｅ
−Ｃｏ合金で、 前記Ｍ２は前記ＲＥ−Ｔｉ−Ｍ１−Ｍ２系合金全体量の
４〜１０原子％含有し、かつホウ素Ｂ、炭素Ｃ、ケイ素
Ｓｉ、リンＰの少なくとも１種以上の元素で、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 Claims] A magneto-optical recording medium in which at least a magneto-optical recording layer is formed on a substrate and a protective layer for protecting the magneto-optical recording layer is formed, wherein the magneto-optical recording layer is made of RE-Ti-M1. -M2-based alloy, furthermore, the RE contains one or more rare earth elements in an amount of 18 to 35 atomic % of the total amount of (RE+Ti+M1), and the Ti is a rare earth element of the total amount of (RE+Ti+M1). 2-1
Titanium containing 5 at%, and M1 is iron Fe element, cobalt Co element, or Fe element.
-Co alloy, the M2 contains 4 to 10 atomic% of the total amount of the RE-Ti-M1-M2 alloy, and is at least one element of boron B, carbon C, silicon Si, and phosphorus P, A magneto-optical recording medium characterized by having the following configurations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61083356A JPS62239447A (en) | 1986-04-11 | 1986-04-11 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61083356A JPS62239447A (en) | 1986-04-11 | 1986-04-11 | Magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62239447A true JPS62239447A (en) | 1987-10-20 |
Family
ID=13800155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61083356A Pending JPS62239447A (en) | 1986-04-11 | 1986-04-11 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62239447A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0770996A3 (en) * | 1995-10-28 | 1998-01-28 | Samsung Electronics Co., Ltd. | Amorphous alloy of light rare earth-transition metal and semi-metal, magneto-optical recording layer and magneto-optical disk adopting the layer |
| US6324127B1 (en) | 1996-01-18 | 2001-11-27 | Samsung Electronics Co., Ltd. | Magneto-optical recording layer having double-layer structure and magneto-optical disk adopting the same |
-
1986
- 1986-04-11 JP JP61083356A patent/JPS62239447A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0770996A3 (en) * | 1995-10-28 | 1998-01-28 | Samsung Electronics Co., Ltd. | Amorphous alloy of light rare earth-transition metal and semi-metal, magneto-optical recording layer and magneto-optical disk adopting the layer |
| US6331338B1 (en) | 1995-10-28 | 2001-12-18 | Samsung Electronics Co., Ltd. | Amorphous alloy of light rare earth-transition metal and semi-metal, magneto-optical recording layer made of the alloy, and magneto-optical disk adopting the layer |
| US6324127B1 (en) | 1996-01-18 | 2001-11-27 | Samsung Electronics Co., Ltd. | Magneto-optical recording layer having double-layer structure and magneto-optical disk adopting the same |
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