JPH0729161A - Magnetic disk - Google Patents
Magnetic diskInfo
- Publication number
- JPH0729161A JPH0729161A JP16998893A JP16998893A JPH0729161A JP H0729161 A JPH0729161 A JP H0729161A JP 16998893 A JP16998893 A JP 16998893A JP 16998893 A JP16998893 A JP 16998893A JP H0729161 A JPH0729161 A JP H0729161A
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- Prior art keywords
- magnetic
- magnetic disk
- film
- protective
- protective film
- Prior art date
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Abstract
(57)【要約】
【目的】空隙損失低減、耐摩耗性確保、表面平滑性向
上、吸着防止、付着物除去効果といった互いに相反する
項目を高度にバランスさせることが可能な連続薄膜磁気
ディスクを提供する。
【構成】磁性層の水平方向に２種類以上の硬度の異なる
保護膜を分布させ、該保護膜のうち、少なくとも１種類
は使用される磁気ヘッドよりも硬度が高く、且つ、その
保護膜膜厚が、他の保護膜よりも厚く、また、その他の
保護膜の内、少なくとも１種類は、多孔質材または潤滑
効果を持つ材質を使用したものとする。
(57) [Summary] [Purpose] To provide a continuous thin-film magnetic disk capable of highly balancing conflicting items such as reduction of void loss, ensuring wear resistance, improvement of surface smoothness, prevention of adsorption, and effect of removing deposits. To do. Constitution: Two or more kinds of protective films having different hardnesses are distributed in the horizontal direction of the magnetic layer, and at least one of the protective films has a hardness higher than that of the magnetic head to be used, and the thickness of the protective film. However, it is assumed that it is thicker than the other protective film, and at least one of the other protective films uses a porous material or a material having a lubricating effect.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高記録密度用の連続薄
膜磁気ディスクに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous thin film magnetic disk for high recording density.
【０００２】[0002]
【従来の技術】近年、磁気ディスクは、顧客ニーズに伴
う大容量化及び／あるいはダウンサイジング化を達成す
るために記録密度の向上に努めてきた。その過程で、磁
気ディスクは、従来の針状等の磁性材料をアルミナ等の
耐摩耗粒子と共に樹脂中に分散させたものを回転塗布す
る塗布ディスクから、メッキ、スパッタリング等によ
り、基板表面に極薄い連続した磁性膜が形成され、耐蝕
性、耐摩耗性確保のために炭素、二酸化珪素等を磁性膜
表面に保護膜として形成した連続薄膜ディスクに変更さ
れつつある。この連続薄膜ディスクを採用することによ
り、磁気ディスクの保磁力が向上すると共に、磁気ディ
スク表面の平滑性向上による磁気ヘッドの低浮上化が可
能となり、高記録密度化が達成され、顧客ニーズを満足
することが可能となってきている。2. Description of the Related Art In recent years, magnetic disks have been endeavoring to improve their recording density in order to achieve a large capacity and / or downsizing according to customer needs. In the process, the magnetic disk is spin coated from a conventional magnetic material such as needle-shaped magnetic material dispersed in resin together with wear-resistant particles such as alumina. It is extremely thin on the substrate surface by plating, sputtering, etc. A continuous thin film is being formed, and in order to secure corrosion resistance and wear resistance, it is being changed to a continuous thin film disk in which carbon, silicon dioxide, etc. are formed as a protective film on the surface of the magnetic film. By adopting this continuous thin film disk, the coercive force of the magnetic disk is improved, and the flying height of the magnetic head can be lowered by improving the smoothness of the magnetic disk surface, achieving high recording density and satisfying customer needs. Is becoming possible.
【０００３】しかしながら、磁気ディスクに連続薄膜デ
ィスクを採用するに当たっては、以下のような矛盾を解
決する必要がある。However, in adopting a continuous thin film disk as a magnetic disk, it is necessary to solve the following contradiction.
【０００４】（１）磁気ディスクの保護膜の膜厚は、空
隙損失の低減のためには、より薄いほうが良いが、耐摩
耗性確保のためには、厚いほうが良い。(1) The thickness of the protective film of the magnetic disk is preferably thinner in order to reduce the void loss, but thicker in order to secure the wear resistance.
【０００５】（２）磁気ヘッドの低浮上化のためには、
磁気ディスク表面の平滑性が高いほど良いが、従来より
磁気ディスク装置に主として使用されているコンタクト
スタート・ストップ方式の場合、粘着（潤滑剤等による
装置停止時における磁気ディスクと磁気ヘッドの吸着現
象）防止のためには、平滑性は低いほうが良い。(2) In order to reduce the flying height of the magnetic head,
The higher the smoothness of the magnetic disk surface, the better. However, in the case of the contact start / stop method that has been mainly used in magnetic disk devices from the past, adhesion (adhesion phenomenon between magnetic disk and magnetic head when the device is stopped by lubricant etc.) For prevention, low smoothness is preferable.
【０００６】（３）磁気ヘッドの安定低浮上のためには
磁気ヘッドへの付着物は少ないほどよいが、磁気ディス
ク表面の平滑性が高くなるにつれて、付着物の除去効果
は次第に低くなる。(3) In order to stabilize and float the magnetic head less, it is better to have less adhered matter to the magnetic head. However, as the smoothness of the magnetic disk surface becomes higher, the effect of removing the adhered matters becomes gradually lower.
【０００７】以上３点の矛盾を解決するに当たり、基本
的には、表面平滑性を幾分落しつつ、耐摩耗性確保及び
粘着防止を実現するという方法が取られてきており、特
開昭５９−２２９７４３号公報、特開昭６４−３７７１
４号公報、特開平１−１３４７２０号公報、特開平１−
１４６１３２号公報のように何らかの形で磁気ディスク
表面に突起を形成する方法等が行われている。[0007] In solving the above three contradictions, basically, a method has been taken in which the abrasion resistance is secured and the adhesion is prevented while the surface smoothness is somewhat lowered. No. 229743, Japanese Patent Laid-Open No. 64-3771
4, JP-A-1-134720, JP-A-1-
As in Japanese Patent No. 146132, a method of forming protrusions on the surface of a magnetic disk in some form is used.
【０００８】[0008]
【発明が解決しようとする課題】本発明の目的は、簡単
な形状及び構成を持つ薄い保護膜で、空隙損失低減、耐
摩耗性確保、表面平滑性向上、吸着防止、付着物除去効
果といった互いに相反する項目を高度にバランスさせる
ことが可能な連続薄膜磁気ディスクを提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a thin protective film having a simple shape and structure, which reduces void loss, ensures wear resistance, improves surface smoothness, prevents adsorption, and removes deposits. An object of the present invention is to provide a continuous thin film magnetic disk capable of highly balancing conflicting items.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明では、連続薄膜磁気ディスクの磁性層表面に
２種類以上の硬度の異なる保護膜を、該連続薄膜磁気デ
ィスク磁性層表面の水平方向に分布させ、該保護膜のう
ち、少なくとも１種類は、使用される磁気ヘッドよりも
硬度が高く、且つ、その保護膜の膜厚を、他の保護膜よ
りも厚いものとしたものである。また、より薄い、磁気
ヘッドより硬度の低い保護膜の１種として、多孔質材ま
たは潤滑効果を持つ材質を使用したものである。さら
に、最大膜厚を持つ、磁気ヘッドよりも堅い保護膜は、
磁性膜に垂直な断面の最上部に稜を持ち、その稜は、磁
気ディスクの接線方向に垂直、且つ、磁性膜に平行な成
分を持つ形状としたものである。In order to achieve the above object, in the present invention, two or more kinds of protective films having different hardnesses are provided on the surface of a magnetic layer of a continuous thin film magnetic disk and the protective film of the magnetic layer on the surface of the continuous thin film magnetic disk is horizontal. Direction, and at least one of the protective films has a hardness higher than that of the magnetic head used, and the thickness of the protective film is thicker than other protective films. . Further, a porous material or a material having a lubricating effect is used as one kind of thinner protective film having a hardness lower than that of the magnetic head. Furthermore, the protective film, which has the maximum film thickness and is harder than the magnetic head,
A ridge is provided at the uppermost part of the cross section perpendicular to the magnetic film, and the ridge has a shape perpendicular to the tangential direction of the magnetic disk and having a component parallel to the magnetic film.
【００１０】[0010]
【作用】本発明によれば、連続薄膜磁気ディスクの磁性
層表面に２種類以上の硬度の異なる保護膜が付与され、
前記保護膜のうち、少なくとも１種類の保護膜は、硬度
が磁気ヘッドの硬度よりも高く、且つ、その保護膜膜厚
が他の保護膜より厚くなり、さらにより薄い保護膜の少
なくとも１種類に多孔質材または潤滑効果を持つ材質を
用いて長期の潤滑効果を保持させたことにより、保護膜
の最大膜厚を抑えつつ、空隙損失低減、耐摩耗性確保、
表面平滑性向上、吸着防止、付着物除去効果といった互
いに相反する項目を高度にバランスさせることが可能と
なっている。According to the present invention, two or more kinds of protective films having different hardness are provided on the surface of the magnetic layer of the continuous thin film magnetic disk,
Of the protective films, at least one kind of protective film has a hardness higher than that of the magnetic head, and the thickness of the protective film is thicker than the other protective films. By maintaining a long-term lubrication effect using a porous material or a material with a lubrication effect, reducing the maximum loss of the protective film while reducing void loss and ensuring wear resistance,
It is possible to highly balance the mutually contradictory items such as surface smoothness improvement, adsorption prevention, and deposit removal effect.
【００１１】[0011]
【実施例】以下、図面を用いて本発明の実施例を説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１及び図２は、本発明の一実施例を示す
図面で、図１は、保護膜を２種類使用した場合の連続薄
膜磁気ディスクの断面図、図２は、保護膜を２種類使用
した場合の連続薄膜磁気ディスクの上面図である。1 and 2 are views showing an embodiment of the present invention. FIG. 1 is a sectional view of a continuous thin film magnetic disk when two kinds of protective films are used, and FIG. It is a top view of a continuous thin film magnetic disk when using it by type.
【００１３】磁気ディスク７は、Ａｌ・Ｍｇ合金等の基
板１上に、Ｎｉ−Ｐ等の下地膜２、γＦｅ2Ｏ3（γ酸化
鉄）、Ｃｏ・Ｎｉ合金等の磁性膜３、Ｃ、ＳｉＯ2等の
保護膜４ａ、４ｂをメッキ、スパッタリング、ＣＶＤ等
により順次積層し、その後、浸漬、スピンコート等によ
りパーフロロカーボン系等の潤滑剤５を付着させて形成
する。The magnetic disk 7 comprises a substrate 1 made of Al.Mg alloy or the like, a base film 2 made of Ni-P or the like, magnetic films 3, C made of Co.Ni alloy or the like, γFe 2 O 3 (γ iron oxide). The protective films 4a and 4b such as SiO 2 are sequentially laminated by plating, sputtering, CVD, etc., and thereafter, a lubricant 5 such as perfluorocarbon type is attached by dipping, spin coating or the like.
【００１４】今、空隙損失低減、耐摩耗性確保、表面平
滑性向上、吸着防止、付着物除去効果といった観点か
ら、磁気ディスクに要求される事項を表にすると、表１
のようになる。Now, from the viewpoints of reduction of void loss, ensuring of wear resistance, improvement of surface smoothness, prevention of adsorption, and effect of removing deposits, a table is shown in Table 1 below.
become that way.
【００１５】[0015]
【表１】 [Table 1]
【００１６】これらの事を勘案して、保護膜４ａ、４ｂ
の形状を考えると、次のようなものが望ましいことにな
る。In consideration of these matters, the protective films 4a and 4b are provided.
Considering the shape of, the following is desirable.
【００１７】（１）保護膜４ａの膜厚は最大３０ｎｍ。
望ましくは１０〜２０ｎｍ。(1) The thickness of the protective film 4a is 30 nm at maximum.
Desirably 10 to 20 nm.
【００１８】（２）保護膜４ｂの膜厚は、保護膜４ａに
対し５ｎｍ程度薄くする。(2) The thickness of the protective film 4b is about 5 nm smaller than that of the protective film 4a.
【００１９】（３）保護膜４ａの形状は、磁気ディスク
の接線方向に垂直な成分を有し、１個当りの大きさはφ
０．５〜φ２μｍ相当、分布密度は、Ｒａ１〜５０ｎｍ
になるように調整する。(3) The shape of the protective film 4a has a component perpendicular to the tangential direction of the magnetic disk, and the size of each is φ.
0.5 to φ2 μm equivalent, distribution density Ra1 to 50 nm
Adjust so that
【００２０】（４）保護膜４ａ、４ｂ、及び磁気ヘッド
の硬度は、高い方から順に、保護膜４ａ＞磁気ヘッド＞
保護膜４ｂ とする。(4) The hardnesses of the protective films 4a and 4b and the magnetic head are, in order from the highest hardness, the protective film 4a> the magnetic head>
The protective film 4b is used.
【００２１】（５）保護膜４ｂの材質は、潤滑剤保持に
よる耐磨耗性確保のの観点から、多孔質材、又は、潤滑
効果を持つ材質を使用する。(5) As the material of the protective film 4b, a porous material or a material having a lubricating effect is used from the viewpoint of ensuring abrasion resistance by retaining a lubricant.
【００２２】このようにして作成した磁気ディスクは、 （１）保護膜４ａの最大高さが規定されていることから
空隙損失の低減が可能。In the magnetic disk thus manufactured, (1) Since the maximum height of the protective film 4a is defined, the air gap loss can be reduced.
【００２３】（２）保護膜４ａの硬度が磁気ヘッドより
も高いため耐摩耗性が確保される。(2) Since the hardness of the protective film 4a is higher than that of the magnetic head, abrasion resistance is secured.
【００２４】（３）保護膜４ａと４ｂに適当な段差を作
成し、さらに保護膜４ａの分布密度によりＲａを調整し
てあるため、表面平滑性をさほど損なうことなく吸着防
止及び付着物除去が可能。(3) Appropriate steps are formed on the protective films 4a and 4b, and Ra is adjusted by the distribution density of the protective film 4a, so that adsorption can be prevented and adhering substances can be removed without significantly impairing the surface smoothness. Possible.
【００２５】（４）保護膜４ｂに多孔質材または潤滑効
果を持つ材質を使用することにより、表面に塗布した潤
滑剤５が流動性、熱分解等により減少しても、潤滑効果
を持つ材質、または、多孔質剤中に含浸された潤滑剤５
のしみ出しにより、長期に渡り潤滑効果が保持されるた
め、耐磨耗性が長期に渡り確保される。(4) By using a porous material or a material having a lubricating effect for the protective film 4b, a material having a lubricating effect even if the lubricant 5 applied to the surface is reduced by fluidity or thermal decomposition. Or a lubricant 5 impregnated in a porous agent
By exuding, the lubrication effect is maintained for a long period of time, so that abrasion resistance is ensured for a long period of time.
【００２６】となり、高記録密度用磁気ディスクとして
非常に有用である。Therefore, it is very useful as a magnetic disk for high recording density.
【００２７】尚、本実施例では、保護膜を２種類とした
が、保護膜の種類数は、２種類に限定されるものではな
く、用途あるいは性能に応じて２種類以上が磁性膜の水
平方向に分布していればよい。In this embodiment, two kinds of protective films are used. However, the number of kinds of protective films is not limited to two, and two or more kinds are horizontal magnetic films depending on the use or performance. It only needs to be distributed in the direction.
【００２８】[0028]
【発明の効果】以上のように、連続薄膜磁気ディスクの
磁性層表面に２種類以上の硬度の異なる保護膜を付与
し、前記保護膜のうち、少なくとも１種類の保護膜は、
硬度が磁気ヘッドの硬度よりも高く、且つ、その保護膜
膜厚が他の保護膜より厚いものとし、また、より薄い保
護膜の内少なくとも１種類に多孔質材または潤滑効果を
持つ材質を使用することにより、空隙損失低減、耐摩耗
性確保、表面平滑性向上、吸着防止、付着物除去効果と
いった互いに相反する項目を高度にバランスさせた、高
記録密度に適した磁気ディスクを得ることができる。As described above, two or more kinds of protective films having different hardness are provided on the surface of the magnetic layer of the continuous thin film magnetic disk, and at least one of the protective films is
The hardness is higher than that of the magnetic head, and the thickness of the protective film is thicker than other protective films, and at least one of the thinner protective films uses a porous material or a material having a lubricating effect. By doing so, it is possible to obtain a magnetic disk suitable for high recording density, in which highly contradictory items such as void loss reduction, abrasion resistance assurance, surface smoothness improvement, adsorption prevention, and deposit removal effect are highly balanced. .
【図１】保護膜を２種類使用した場合の連続薄膜磁気デ
ィスクの一実施例の断面図である。FIG. 1 is a sectional view of an example of a continuous thin film magnetic disk when two types of protective films are used.
【図２】保護膜を２種類使用した場合の連続薄膜磁気デ
ィスクの一実施例の上面図である。FIG. 2 is a top view of an example of a continuous thin film magnetic disk when two types of protective films are used.
１…基板、 ２…下地膜、 ３…磁性膜、 ４ａ、４ｂ…保護膜、 ５…潤滑剤、 ６…保護膜段差、 ７…磁気ディスク。 1 ... Substrate, 2 ... Underlayer film, 3 ... Magnetic film, 4a, 4b ... Protective film, 5 ... Lubricant, 6 ... Protective film step, 7 ... Magnetic disk.
Claims (2)
って、その磁性層表面に２種類以上の硬度の異なる保護
膜を、該連続薄膜磁気ディスク磁性層表面の水平方向に
分布させ、該保護膜のうち、少なくとも１種類は、使用
される磁気ヘッドよりも硬度が高く、且つ、その膜厚が
最大となり、また、該保護膜に使用される、磁気ヘッド
よりも硬度の低い保護膜のうち、少なくとも１種類は、
多孔質材または潤滑効果を持つ材質を使用したことを特
徴とする磁気ディスク。1. A continuous thin film magnetic disk for high recording density, wherein two or more kinds of protective films having different hardness are distributed on the surface of the magnetic layer in the horizontal direction of the magnetic layer surface of the continuous thin film magnetic disk. At least one of the protective films has a hardness higher than that of the magnetic head used and has a maximum film thickness, and is a protective film having a hardness lower than that of the magnetic head used for the protective film. At least one of them is
A magnetic disk characterized by using a porous material or a material having a lubricating effect.
な断面の最上部に稜を持つ形状で、その稜は、磁気ディ
スクの接線方向に垂直で、且つ、磁性膜には平行な成分
を持つことを特徴とする前記請求項１の磁気ディスク。2. The protective film having the maximum film thickness has a shape having a ridge at the uppermost part of the cross section perpendicular to the magnetic film, and the ridge is perpendicular to the tangential direction of the magnetic disk and is not formed on the magnetic film. The magnetic disk according to claim 1, wherein the magnetic disk has parallel components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16998893A JPH0729161A (en) | 1993-07-09 | 1993-07-09 | Magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16998893A JPH0729161A (en) | 1993-07-09 | 1993-07-09 | Magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0729161A true JPH0729161A (en) | 1995-01-31 |
Family
ID=15896520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16998893A Pending JPH0729161A (en) | 1993-07-09 | 1993-07-09 | Magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729161A (en) |
-
1993
- 1993-07-09 JP JP16998893A patent/JPH0729161A/en active Pending
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