JPH0366044A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JPH0366044A JPH0366044A JP20124989A JP20124989A JPH0366044A JP H0366044 A JPH0366044 A JP H0366044A JP 20124989 A JP20124989 A JP 20124989A JP 20124989 A JP20124989 A JP 20124989A JP H0366044 A JPH0366044 A JP H0366044A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- fine particles
- substrate
- binder
- 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.)
- Granted
Links
- 239000010419 fine particle Substances 0.000 claims abstract description 21
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 3
- 229910052738 indium Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052706 scandium Inorganic materials 0.000 claims abstract description 3
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract 2
- 229910052732 germanium Inorganic materials 0.000 claims abstract 2
- 229910052745 lead Inorganic materials 0.000 claims abstract 2
- 229910052749 magnesium Inorganic materials 0.000 claims abstract 2
- 229910052702 rhenium Inorganic materials 0.000 claims abstract 2
- 229910052703 rhodium Inorganic materials 0.000 claims abstract 2
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract 2
- 229910052718 tin Inorganic materials 0.000 claims abstract 2
- 229910052719 titanium Inorganic materials 0.000 claims abstract 2
- 229910052726 zirconium Inorganic materials 0.000 claims abstract 2
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- -1 TaJo Inorganic materials 0.000 description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229910000982 rare earth metal group alloy Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000687 transition metal group alloy Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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、マグネトプランバイト型フェライト微粒子を
用いた光磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magneto-optical recording medium using magnetoplumbite type ferrite fine particles.
（従来の技術およびその問題点）
従来、光磁気記録媒体に−用いられる磁性体としては、
希土類金属と遷移金属との非晶質合金からなるものが知
られている。(Prior art and its problems) Conventionally, magnetic materials used in magneto-optical recording media include:
Those made of amorphous alloys of rare earth metals and transition metals are known.
しかし、このような非晶質合金の磁性体は、酸化腐食を
受けやすく、磁気光学特性が劣化するという欠点があっ
た。また、非晶質合金を用いた光磁気記録では、磁性膜
表面での反射による磁気光学効果（カー効果）を利用し
て再生を行うが、非晶質合金は一般にカー回転角が小さ
いため、感度が低いという問題があった。However, such amorphous alloy magnetic bodies have the drawback of being susceptible to oxidative corrosion and deteriorating magneto-optical properties. In addition, in magneto-optical recording using an amorphous alloy, reproduction is performed using the magneto-optic effect (Kerr effect) caused by reflection on the surface of a magnetic film, but since amorphous alloys generally have a small Kerr rotation angle, There was a problem with low sensitivity.
これに対し、特公昭５６−１５１２５号公報、特開昭６
１−８９６０５号公報には、それぞれガーネット、六方
晶フェライトの多結晶質酸化物薄膜を用いた光磁気記録
媒体が提案されている。この酸化物を用いた磁性体は、
耐蝕性に優れており、また磁性膜の透過光による磁気光
学効果（ファラデー効果）を利用して再生を行うため、
感度が高いという利点がある。しかしながら、多結晶質
であるために、結晶粒界での光散乱、複屈折や磁壁移動
による書き込みビット形状の乱れ等によって媒体雑音が
大きくなるという欠点がある。In contrast, Japanese Patent Publication No. 56-15125, Japanese Patent Application Publication No. 6
No. 1-89605 proposes magneto-optical recording media using polycrystalline oxide thin films of garnet and hexagonal ferrite, respectively. A magnetic material using this oxide is
It has excellent corrosion resistance and reproduces using the magneto-optical effect (Faraday effect) caused by light transmitted through the magnetic film.
It has the advantage of high sensitivity. However, since it is polycrystalline, it has the disadvantage that medium noise increases due to light scattering at crystal grain boundaries, disturbances in the shape of written bits due to birefringence, domain wall movement, and the like.
また、前記した磁性薄膜の光磁気記録媒体は、作製温度
が５００°Ｃ以上と高いために、耐熱性のある基板しか
使用できないという問題があった。Furthermore, since the above-mentioned magnetic thin film magneto-optical recording medium has a manufacturing temperature as high as 500° C. or higher, there is a problem in that only heat-resistant substrates can be used.
一方、特開昭６２−１１４９号公報には、大方晶フェラ
イト粒子を用いた塗布型光磁気記録媒体が開示されてい
る。このような塗布型媒体では、前記多結晶質酸化物薄
膜のような結晶粒界の悪影響はないが、塗布型媒体は、
バインダ中に磁性粒子が分散した状態であるため、両者
の屈折率の違いにより光の散乱が起こり、ノイズが発生
するという問題があった。On the other hand, JP-A-62-1149 discloses a coated magneto-optical recording medium using macrogonal ferrite particles. In such a coated medium, there is no adverse effect of grain boundaries as in the polycrystalline oxide thin film, but in the coated medium,
Since the magnetic particles are dispersed in the binder, there is a problem in that light scatters due to the difference in refractive index between the binder and noise.
（発明の目的）
本発明は、前記欠点を解決し、耐蝕性に優れ、磁気光学
効果が大きく、かつＳ／Ｎ比が大きく、高密度記録が可
能で、さらに生産性に優れた光磁気記録媒体を提供する
ことにある。(Object of the Invention) The present invention solves the above-mentioned drawbacks, and provides magneto-optical recording that has excellent corrosion resistance, a large magneto-optic effect, a large S/N ratio, enables high-density recording, and has excellent productivity. The goal is to provide a medium.
（問題点を解決するための手段）
本発明は、基板上に、下記一般式（Ｉ）で表され、かつ
平均粒子径が３０〜１０００人であるマグネトプランバ
イト型フェライト微粒子と、該微粒子の屈折率とのずれ
が±２０％以内である屈折率を有するバインダからなる
磁性層を設けてなる光磁気記録媒体に関する。(Means for Solving the Problems) The present invention provides magnetoplumbite type ferrite fine particles represented by the following general formula (I) and having an average particle size of 30 to 1000 particles on a substrate, and The present invention relates to a magneto-optical recording medium provided with a magnetic layer made of a binder having a refractive index whose deviation from the refractive index is within ±20%.
Ａ ０−ｎ（Ｆｅ１２−Ｍ−０＋＊−ｙ）
（Ｉ ）（ただし、ＡはＢａ、Ｓｒ、Ｃａ及びｐｂか
らなる群より選・・・・・・（Ｉ）（ただし、ＡはＣｏ
、Ｎｉ、Ｃｕ、Ｚｎ。A 0-n(Fe12-M-0+*-y)
(I) (However, A is selected from the group consisting of Ba, Sr, Ca and pb... (I) (However, A is Co
, Ni, Cu, Zn.
Ｍｇ＋ Ｍｎ、 Ｓｃ、 Ｉｎ＋ Ｃｒ＊ Ａｌ、Ｇａ
＋ Ｒｈ、 Ｒｕｍ Ｒｅ＋ Ｇｅ、 Ｔｉ ｌＺｒ＋
Ｓｎ＋ Ｇｅ。Mg+ Mn, Sc, In+ Cr* Al, Ga
+ Rh, Rum Re+ Ge, TilZr+
Sn+Ge.
Ｎｂ＋Ｓｂ、 Ｖ、ＴａＪｏ及びＷからなる群より選ば
れる一種以上の元素を示し、ｎ ＝ ０．８〜１．２、
ｘ ＝ ０．１〜５．０． ｙ −（３−ｍ） ｘ／２
（ｍはＭの平均原子価を表す）である。）
本発明の前記一般式における、ＡはＢａ、Ｓｒ、Ｃａ及
びｐｂからなる群より選ばれる一種以上の元素であり、
ｎ ＝ ０．８〜１．２である。Indicates one or more elements selected from the group consisting of Nb+Sb, V, TaJo, and W, n = 0.8 to 1.2,
x = 0.1-5.0. y-(3-m) x/2
(m represents the average valence of M). ) In the general formula of the present invention, A is one or more elements selected from the group consisting of Ba, Sr, Ca and pb,
n = 0.8 to 1.2.
また、Ｆｅと置換されるＭはＣｏ、 Ｎｔ ｌ Ｃｕ、
Ｚｎ＋ Ｍｇ＋ ’ＬＳｃ、 Ｉｎ＋Ｃｒ＋ＡＩ＋Ｇ
ａｌ ＲｈＪｕ＋ Ｒｅ＋ Ｇｅ＋ Ｔｉ＋ Ｚｒ＋
Ｓｎ＋ Ｇｅ＋ Ｎｂ、 ｓｂ。Moreover, M substituted with Fe is Co, Nt l Cu,
Zn+ Mg+ 'LSc, In+Cr+AI+G
al RhJu+ Re+ Ge+ Ti+ Zr+
Sn+Ge+Nb, sb.
Ｖ、Ｔａ、Ｍｏ及びＷからなる群より選ばれる一種以上
の元素であり、置換量ｘ ＝ ０．１〜５．０である。It is one or more elements selected from the group consisting of V, Ta, Mo, and W, and the substitution amount x = 0.1 to 5.0.
本発明において、Ｍの元素又は元素の組合せは自由に選
択できるが、それらの平均原子価をｍで表した場合に、
）’＝ （３−ｍ）ｘ／２が−０，５〜２の範囲となる
ようにＭの元素を選択することが好ましい。特に、Ｍの
元素としてＣｏ及び／又はＮｉを採用した場合には、フ
ァラデー回転角を大きくすることができる。また、それ
以外の元素の場合には、キュリー温度を下げることがで
きる。In the present invention, the element M or the combination of elements can be freely selected, but when their average valence is expressed as m,
)'= (3-m) It is preferable to select the element M so that x/2 is in the range of -0.5 to 2. In particular, when Co and/or Ni are used as the element M, the Faraday rotation angle can be increased. Moreover, in the case of other elements, the Curie temperature can be lowered.
本発明におけるマグネトプランバイト型フェライト微粒
子の平均粒子径は３０〜１ｏｏｏ人、好ましくは１００
〜６００人である。平均粒子径が３０λよりも小さくな
ると熱攪乱のために超常磁性となってしまう。また、１
０００人よりも大きくなると光の散乱が起こり、ノイズ
が発生するので好ましくない。The average particle diameter of the magnetoplumbite type ferrite fine particles in the present invention is 30 to 100 mm, preferably 100 mm.
~600 people. When the average particle diameter is smaller than 30λ, it becomes superparamagnetic due to thermal disturbance. Also, 1
If the number of people exceeds 000, light scattering occurs and noise is generated, which is not preferable.
また、マグネトプランバイト型フェライト微粒子の保磁
力は磁化の安定性のためにできるだけ大きいことが好ま
しく、０．５〜６ｋＯｅであることが好ましい。Further, the coercive force of the magnetoplumbite type ferrite fine particles is preferably as large as possible for the stability of magnetization, and is preferably 0.5 to 6 kOe.
前記マグネトプランバイト型フェライト微粒子の製造方
法としては、前述の特性を有する粒子が得られれば特に
制限はなく、従来知られている共沈法、水熱合成法、フ
ラックス法のいずれを用いてもよい。The method for producing the magnetoplumbite type ferrite fine particles is not particularly limited as long as particles having the above-mentioned characteristics can be obtained, and any of the conventionally known coprecipitation methods, hydrothermal synthesis methods, and flux methods may be used. good.
本発明における磁性層は、前記マグネトプランバイト型
フェライト微粒子とバインダーから形成される。バイン
ダーとしては、無機酸化物の非晶質バインダーや有機バ
インダーが用いられる。特に、光の散乱を防ぐために、
マグネトプランバイト型フェライト微粒子の屈折率との
ずれが±２０％以内である屈折率を有するものが用いら
れる。The magnetic layer in the present invention is formed from the magnetoplumbite type ferrite fine particles and a binder. As the binder, an amorphous binder of an inorganic oxide or an organic binder is used. In particular, to prevent light scattering,
A material having a refractive index that differs from the refractive index of magnetoplumbite type ferrite fine particles within ±20% is used.
ここで、マグネトプランバイト型フェライト微粒子の屈
折率はｎ−１ｋで表されるが、ｎについてのずれが±２
０％以内、好ましくは±１０％以内である屈折率を有す
るバインダが用いられる。さらに、屈折率のｋについて
のずれも±２０％以内、好ましくは±１０％以内である
ものが望ましい。Here, the refractive index of magnetoplumbite type ferrite fine particles is expressed as n-1k, but the deviation with respect to n is ±2
A binder having a refractive index within 0%, preferably within ±10% is used. Further, it is desirable that the deviation of the refractive index k be within ±20%, preferably within ±10%.
磁性層の厚みは、０．０５〜２．０μｍ、特に０．２〜
１．０μｍの範囲が記録ビットの安定性の上で好ましい
。The thickness of the magnetic layer is 0.05 to 2.0 μm, particularly 0.2 to 2.0 μm.
A range of 1.0 μm is preferable in terms of stability of recording bits.
磁性層は、マグネトプランバイト型フェライト微粒子及
びバインダーを水又は有機溶媒中に分散又は溶解させ、
基板上に塗布した後、磁場を基板に対して垂直方向にか
けながら、加熱処理等によりバインダーを硬化させるこ
とにより形成される。The magnetic layer is made by dispersing or dissolving magnetoplumbite type ferrite fine particles and a binder in water or an organic solvent,
After being applied onto a substrate, the binder is formed by hardening the binder by heat treatment or the like while applying a magnetic field in a direction perpendicular to the substrate.
この際、マグネトプランバイト型フェライト微粒子にか
かるバインダーの硬化による応力と結晶磁気異方性によ
り基板に対して垂直方向に磁化が揃う。At this time, the magnetization is aligned in the direction perpendicular to the substrate due to the stress caused by hardening of the binder applied to the magnetoplumbite-type ferrite fine particles and the magnetocrystalline anisotropy.
基板としては、特に制限はなく、単結晶基板、多結晶基
板、ガラス等の非晶質基板、その他複合基板等の無機材
料基板、またはアクリル樹脂、ポリカーボネート樹脂、
ボリエ文チル樹脂、ボリアミド樹脂、ボリイξド樹脂等
の有機材料基板を用いることができる。The substrate is not particularly limited, and may be a single crystal substrate, a polycrystalline substrate, an amorphous substrate such as glass, another inorganic material substrate such as a composite substrate, or acrylic resin, polycarbonate resin,
An organic material substrate such as a polyester resin, a polyamide resin, a polyamide resin, or the like can be used.
本発明においては、基板と磁性層の間又は磁性層の上に
光反射層を設けることが好ましい。In the present invention, it is preferable to provide a light reflective layer between the substrate and the magnetic layer or on the magnetic layer.
光反射層としては、Ｃｕ＋Ｃｒ＋ＡＩ＋Ａｇ＋Ａｕ、Ｔ
ｉＮ等が用いられる。この光反射層は、塗布法、めっき
法、蒸着法等により基板上又は磁性層上に形成される。As a light reflecting layer, Cu+Cr+AI+Ag+Au, T
iN etc. are used. This light-reflecting layer is formed on the substrate or magnetic layer by a coating method, plating method, vapor deposition method, or the like.
（実施例）
以下に実施例および比較例を示し、さらに詳しく本発明
について説明する。(Example) The present invention will be explained in more detail by showing Examples and Comparative Examples below.
実施例１
水熱合成法により以下に示す物性を有するマグネトプラ
ンバイト型フェライト微粒子を合成した。Example 1 Magnetoplumbite type ferrite fine particles having the physical properties shown below were synthesized by a hydrothermal synthesis method.
組ｔｃＢａＯ−Ｆａｔｅ、 ４０Ｏ６，５Ｔｉｏ、 ｇ
ｏ ＋ｓ平均粒子径 ４００人
保磁力 １．０ｋＯｅ
飽和磁化 ３００ ｅｍｕ／ｃｃ
屈折率 ｎ−２，３、ｋ ＝ ０．２次いで、硝
酸ビスマス、硝酸コバルト及び硝酸第二鉄をＢｉ ：
Ｃｏ ： Ｆｅ＝２５ ： ２５ ： ５０のモル比で
含有する水溶液中にこの微粒子粉末を加え、十分分散さ
せた後、直径３インチ、厚さＩＭのガラス基板上に塗布
した。次いで、２５０℃で加熱分解することにより、マ
グネトプランバイト型フェライト微粒子を含有するアモ
ルファスＢ１ＣｏＦｅ酸化物膜を形成させた。このバイ
ンダの屈折率はｎ−２，３、ｋ ＝ ０．２であった。Group tcBaO-Fate, 40O6,5Tio, g
o +s Average particle diameter 400 Coercive force 1.0 kOe Saturation magnetization 300 emu/cc Refractive index n-2,3, k = 0.2 Next, bismuth nitrate, cobalt nitrate and ferric nitrate were added to Bi:
The fine particle powder was added to an aqueous solution containing Co:Fe in a molar ratio of 25:25:50, thoroughly dispersed, and then coated on a glass substrate with a diameter of 3 inches and a thickness of IM. Next, by thermal decomposition at 250° C., an amorphous B1CoFe oxide film containing magnetoplumbite-type ferrite fine particles was formed. The refractive index of this binder was n-2.3, k = 0.2.
得られた塗膜の厚みは０．５μｍであった。The thickness of the resulting coating film was 0.5 μm.
この塗膜の上にアルミニウムの反射膜を蒸着法により形
成させて光磁気記録媒体を得た。A reflective film of aluminum was formed on this coating film by vapor deposition to obtain a magneto-optical recording medium.
得られた媒体の膜面に垂直な方向の磁界に対する７３０
ｎｍの光のファラデー回転角を偏光面変調法により測定
したところ０．４ ｄｅｇであった。730 for the magnetic field in the direction perpendicular to the film surface of the obtained medium
The Faraday rotation angle of nm light was measured by the polarization plane modulation method and was found to be 0.4 deg.
また、この媒体についてＳ／Ｎを評価したところ、５２
ｄＢと非常に高くノイズが少ないことがわかった。Also, when evaluating the S/N of this medium, it was found to be 52.
It was found that the noise level was extremely high (dB) and the noise was low.
実施例２
実施例１において、マグネトプランバイト型フェライト
微粒子の組成を第１表に示すものにかえたほかは、実施
例１と同様にして、光磁気記録媒体を製造した。Example 2 A magneto-optical recording medium was produced in the same manner as in Example 1, except that the composition of the magnetoplumbite type ferrite fine particles was changed to that shown in Table 1.
得られた媒体のファラデー回転角及びＳ／Ｎを実施例１
と同様の方法で測定した結果を第１表に示す。The Faraday rotation angle and S/N of the obtained medium were determined in Example 1.
Table 1 shows the results measured in the same manner as above.
比較例１
水熱合成法により以下に示す物性を有するマグネトプラ
ンバイト型フェライト微粒子を合成した。Comparative Example 1 Magnetoplumbite type ferrite fine particles having the physical properties shown below were synthesized by a hydrothermal synthesis method.
組成 Ｂａ０−Ｆ１３ｔｏ、４ＣＯｏ、５Ｔｉ
ｏ、ｓＯ＋ｓ平均粒子径 １００００人
保磁力 ０．８ｋＯｅ
飽和磁化 ３００ｅ＋ｓｕ／ｃｃ
この粒子を用いて、実施例１と同様にして光磁気記録媒
体を製造した。Composition Ba0-F13to, 4COo, 5Ti
o, sO+s Average particle diameter: 10,000 Coercive force: 0.8 kOe Saturation magnetization: 300 e+su/cc Using these particles, a magneto-optical recording medium was produced in the same manner as in Example 1.
得られた媒体のファラデー回転角及びＳ／Ｎを実施例１
と同様の方法で測定した結果を第１表に示す。The Faraday rotation angle and S/N of the obtained medium were determined in Example 1.
Table 1 shows the results measured in the same manner as above.
比較例２
実施例１と同じマグネトプランバイト型フェライト微粒
子を用い、シリコンアルコキシドのエタノール溶液中に
この微粒子粉末を加え、十分分散させた後、直径３イン
チ、厚さ１閣のガラス基板上に塗布した０次いで、１５
０℃で加熱分解することにより、マグネトプランバイト
型フェライト微粒子を含有するアモルファスＳｉＯ！酸
化物膜を形成させた。このバインダの屈折率はｎ ＝
１．５、ｋ＝Ｏであった。Comparative Example 2 Using the same magnetoplumbite type ferrite fine particles as in Example 1, the fine particle powder was added to an ethanol solution of silicon alkoxide, thoroughly dispersed, and then applied onto a glass substrate with a diameter of 3 inches and a thickness of 1 inch. 0 then 15
By thermal decomposition at 0°C, amorphous SiO containing magnetoplumbite type ferrite particles is produced! An oxide film was formed. The refractive index of this binder is n =
1.5, k=O.
得られた塗膜の厚みは０．５μｍであった。The thickness of the resulting coating film was 0.5 μm.
この塗膜の上にアルミニウムの反射膜を蒸着法により形
成させて光磁気記録媒体を得た。A reflective film of aluminum was formed on this coating film by vapor deposition to obtain a magneto-optical recording medium.
得られた媒体のファラデー回転角及びＳ／Ｎを実施例１
と同様の方法で測定した結果を第１表に示す。The Faraday rotation angle and S/N of the obtained medium were determined in Example 1.
Table 1 shows the results measured in the same manner as above.
比較例３
Ｂａ Ｏ−Ｐｅｔ Ｏ＋ ａｃＯｏ、 ＠Ｔｉｅ、＠
Ｏｒ ｓの組成の焼結体をターゲットとしてスパッタ法
により、直径３インチ、厚さＩＩＩＩＩのガラス基板上
に非晶質被膜を作成した０次いで、６３０℃で１時間加
熱処理することにより、多結晶酸化物薄膜とした。Comparative example 3 Ba O-Pet O+ acOo, @Tie, @
An amorphous film was created on a glass substrate with a diameter of 3 inches and a thickness of III by sputtering using a sintered body with a composition of It was made into an oxide thin film.
得られた被膜の厚みは０．４μｍであった。この被膜の
上にアル逅ニウムの反射膜を蒸着法により形成させて光
磁気記録媒体を得た。The thickness of the obtained film was 0.4 μm. A reflective film of aluminum was formed on this film by vapor deposition to obtain a magneto-optical recording medium.
得られた媒体のファラデー回転角及びＳ／Ｎを実施例１
と同様の方法で測定した結果を第１表に示す。The Faraday rotation angle and S/N of the obtained medium were determined in Example 1.
Table 1 shows the results measured in the same manner as above.
（発明の効果）
本発明の光磁気記録媒体は、耐蝕性に優れ、磁気光学効
果が大きく、特に、マグネトプランバイト型フェライト
微粒子を用いることにより、従来の多結晶質酸化物薄膜
と比較してＳ／Ｎ比が大幅に改善されており、高密度の
光磁気記録に適している。また、塗布法により製造する
ことができ、生産性も良好である。(Effects of the Invention) The magneto-optical recording medium of the present invention has excellent corrosion resistance and a large magneto-optical effect, and in particular, by using magnetoplumbite type ferrite fine particles, it is superior to conventional polycrystalline oxide thin films. The S/N ratio is greatly improved, making it suitable for high-density magneto-optical recording. In addition, it can be manufactured by a coating method and has good productivity.
Claims (1)
径が３０〜１０００Åであるマグネトプランバイト型フ
ェライト微粒子と、該微粒子の屈折率とのずれが±２０
％以内である屈折率を有するバインダからなる磁性層を
設けてなる光磁気記録媒体。 ＡＯ・ｎ（Ｆｅ＿１＿２＿−＿ｘＭｘＯ＿１＿３＿−＿
ｙ）・・・・・・（ I ）（ただし、ＡはＢａ、Ｓｒ、
Ｃａ及びＰｂからなる群より選ばれる一種以上の元素を
示し、ＭはＣｏ、Ｎｉ、Ｃｕ、Ｚｎ、Ｍｇ、Ｍｎ、Ｓｃ
、Ｉｎ、Ｃｒ、Ａｌ、Ｇａ、Ｒｈ、Ｒｕ、Ｒｅ、Ｇｅ、
Ｔｉ、Ｚｒ、Ｓｎ、Ｇｅ、Ｎｂ、Ｓｂ、Ｖ、Ｔａ、Ｍｏ
及びＷからなる群より選ばれる一種以上の元素を示し、
ｎ＝０．８〜１．２、ｘ＝０．１〜５．０、ｙ＝（３−
ｍ）ｘ／２（ｍはＭの平均原子価を表す）である。）[Claims] Magnetoplumbite-type ferrite fine particles represented by the following general formula (I) and having an average particle diameter of 30 to 1000 Å are disposed on a substrate, and the deviation of the refractive index of the fine particles is ±20.
1. A magneto-optical recording medium comprising a magnetic layer made of a binder having a refractive index within %. AO・n(Fe_1_2_-_xMxO_1_3_-_
y)...(I) (However, A is Ba, Sr,
Represents one or more elements selected from the group consisting of Ca and Pb, M is Co, Ni, Cu, Zn, Mg, Mn, Sc
, In, Cr, Al, Ga, Rh, Ru, Re, Ge,
Ti, Zr, Sn, Ge, Nb, Sb, V, Ta, Mo
and one or more elements selected from the group consisting of W,
n=0.8~1.2, x=0.1~5.0, y=(3-
m) x/2 (m represents the average valence of M). )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20124989A JPH0828001B2 (en) | 1989-08-04 | 1989-08-04 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20124989A JPH0828001B2 (en) | 1989-08-04 | 1989-08-04 | Magneto-optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0366044A true JPH0366044A (en) | 1991-03-20 |
| JPH0828001B2 JPH0828001B2 (en) | 1996-03-21 |
Family
ID=16437811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20124989A Expired - Lifetime JPH0828001B2 (en) | 1989-08-04 | 1989-08-04 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0828001B2 (en) |
-
1989
- 1989-08-04 JP JP20124989A patent/JPH0828001B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0828001B2 (en) | 1996-03-21 |
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