JPH0765347A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0765347A JPH0765347A JP20649293A JP20649293A JPH0765347A JP H0765347 A JPH0765347 A JP H0765347A JP 20649293 A JP20649293 A JP 20649293A JP 20649293 A JP20649293 A JP 20649293A JP H0765347 A JPH0765347 A JP H0765347A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic film
- metal magnetic
- film
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気記録媒体に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium.
【０００２】[0002]
【発明の背景】磁気テープ等の磁気記録媒体において
は、高密度記録化の要請から、非磁性支持体上に設けら
れる磁性層として、バインダ樹脂を用いた塗布型のもの
ではなく、バインダ樹脂を用いない金属薄膜型のものが
提案されていることは周知の通りである。BACKGROUND OF THE INVENTION In a magnetic recording medium such as a magnetic tape, due to a demand for high density recording, a binder resin is not used as a magnetic layer provided on a non-magnetic support, instead of a coating type using a binder resin. It is well known that a metal thin film type that is not used has been proposed.
【０００３】すなわち、無電解メッキといった湿式メッ
キ手段、真空蒸着、スパッタリングあるいはイオンプレ
ーティングといった乾式メッキ手段により磁性層を構成
した磁気記録媒体が提案されている。そして、この種の
磁気記録媒体は磁性体の充填密度が高いことから、高密
度記録に適したものである。ところで、この種の金属薄
膜型の磁気記録媒体の製造時、例えばＣｏ−Ｎｉ合金か
らなる金属磁性膜を成膜する時に酸素ガスを導入し、磁
気特性の改善が図られている。That is, there has been proposed a magnetic recording medium having a magnetic layer formed by a wet plating means such as electroless plating, or a dry plating means such as vacuum deposition, sputtering or ion plating. Since the magnetic recording medium of this type has a high packing density of magnetic material, it is suitable for high-density recording. By the way, at the time of manufacturing this kind of metal thin film type magnetic recording medium, for example, when forming a metal magnetic film made of a Co—Ni alloy, oxygen gas is introduced to improve the magnetic characteristics.
【０００４】しかしながら、この酸素ガス導入による磁
気特性の改善手段は、保磁力を向上させることが出来る
ものの、残留磁束密度を減少させることになり、磁気特
性の大幅な改善は達成できていない。However, although the means for improving the magnetic characteristics by introducing the oxygen gas can improve the coercive force, it reduces the residual magnetic flux density, and the magnetic characteristics have not been significantly improved.
【０００５】[0005]
【発明の開示】本発明の目的は、Ｃ／Ｎといった磁気特
性に優れ、再生出力が高い磁気記録媒体を提供すること
である。この本発明の目的は、Ｃｏを主成分とする金属
磁性膜が複数個設けられると共に、これらＣｏを主成分
とする金属磁性膜の間に前記磁性膜の磁気特性とは異な
る磁気特性の金属磁性膜が設けられてなることを特徴と
する磁気記録媒体によって達成される。DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a magnetic recording medium having excellent magnetic characteristics such as C / N and high reproduction output. An object of the present invention is to provide a plurality of metal magnetic films containing Co as a main component, and between the metal magnetic films containing Co as a main component, a metal magnetic film having a magnetic property different from that of the magnetic film. This is achieved by a magnetic recording medium characterized by comprising a film.
【０００６】尚、この本発明の磁気記録媒体における複
数個設けられたＣｏを主成分とする金属磁性膜のうち、
支持体から遠ざかる金属磁性膜ほど保磁力が大きなよう
にＣｏを主成分とする金属磁性膜が構成されてなること
が好ましい。又、Ｃｏを主成分とする金属磁性膜の厚さ
が１００〜２０００Åであることが好ましい。特に、こ
のようなＣｏを主成分とする金属磁性膜の膜厚は、支持
体に一番近い金属磁性膜の膜厚を１とすると、上層の膜
厚が１〜１／１０の厚さになるよう構成されてなること
が好ましい。そして、このようなＣｏを主成分とする金
属磁性膜はＣｏ−Ｎｉ系合金で構成させることが出来
る。特に、Ｃｏを主成分とする金属磁性膜をＣｏ−Ｎｉ
系合金で構成させた場合には、このＣｏ−Ｎｉ系合金磁
性膜のうち支持体から遠ざかる金属磁性膜ほどＮｉ含有
量を少なくさせることが好ましい。例えば、Ｃｏを主成
分とする金属磁性膜をＣｏ−Ｎｉ系合金で構成させた場
合、Ｃｏ−Ｎｉ系合金磁性膜のうち支持体に一番近いＣ
ｏ−Ｎｉ系金属磁性膜のＮｉ含有量が６〜２０ｗｔ％で
あって、遠ざかるにつれてＮｉ含有量が少なくなり、一
番遠い金属磁性膜のＮｉ含有量が５〜１９ｗｔ％である
よう構成されてなることが好ましい。Among a plurality of metal magnetic films containing Co as a main component, provided in the magnetic recording medium of the present invention,
It is preferable that the metal magnetic film containing Co as a main component is formed such that the coercive force increases as the metal magnetic film moves away from the support. Further, the thickness of the metal magnetic film containing Co as a main component is preferably 100 to 2000Å. In particular, the film thickness of such a metal magnetic film containing Co as a main component is such that the film thickness of the upper layer is 1 to 1/10 when the film thickness of the metal magnetic film closest to the support is 1. It is preferable that it is configured as follows. Further, such a metal magnetic film containing Co as a main component can be made of a Co—Ni based alloy. In particular, a metal magnetic film containing Co as a main component is formed of Co-Ni.
When it is made of a system alloy, it is preferable to reduce the Ni content in the metal magnetic film of the Co—Ni alloy magnetic film that is farther from the support. For example, when the metal magnetic film containing Co as a main component is made of a Co—Ni-based alloy, C which is the closest to the support in the Co—Ni-based alloy magnetic film.
The o-Ni-based metal magnetic film has a Ni content of 6 to 20 wt%, the Ni content decreases as the distance increases, and the farthest metal magnetic film has a Ni content of 5 to 19 wt%. It is preferable that
【０００７】又、Ｃｏを主成分とする金属磁性膜の間に
設けられる金属磁性膜の厚さは１００〜５００Åである
ことが好ましく、そしてこのような金属磁性膜はＮｉで
構成させることが出来る。以下、本発明について更に詳
しく説明する。図１に本発明になる磁気記録媒体の概略
断面図を示す。Further, the thickness of the metal magnetic film provided between the metal magnetic films containing Co as a main component is preferably 100 to 500Å, and such a metal magnetic film can be made of Ni. . Hereinafter, the present invention will be described in more detail. FIG. 1 shows a schematic sectional view of a magnetic recording medium according to the present invention.
【０００８】同図中、１は非磁性の支持体であり、この
支持体１はポリエチレンテレフタレート等のポリエステ
ル、ポリアミド、ポリイミド、ポリスルフォン、ポリカ
ーボネート、ポリプロピレン等のオレフィン系の樹脂、
セルロース系の樹脂、塩化ビニル系の樹脂といった高分
子材料、ガラスやセラミック等の無機系材料、アルミニ
ウム合金などの金属材料が用いられる。In the figure, 1 is a non-magnetic support, and this support 1 is an olefin resin such as polyester such as polyethylene terephthalate, polyamide, polyimide, polysulfone, polycarbonate or polypropylene,
Polymer materials such as cellulose resins and vinyl chloride resins, inorganic materials such as glass and ceramics, and metal materials such as aluminum alloys are used.
【０００９】支持体１面上には磁性層の密着性を向上さ
せる為のアンダーコート層２が設けられている。すなわ
ち、表面の粗さを適度に粗すことにより乾式メッキによ
り構成される磁性層の密着性を向上させ、さらに磁気記
録媒体表面の表面粗さを適度なものとして走行性を改善
する為、例えばＳｉＯ2 等の粒子を含有させた厚さが
０．００５〜０．１μｍの塗膜を設けることによってア
ンダーコート層２が構成されている。An undercoat layer 2 for improving the adhesion of the magnetic layer is provided on the surface of the support 1. That is, in order to improve the adhesion of the magnetic layer formed by dry plating by appropriately roughening the surface roughness and further improve the runnability by making the surface roughness of the magnetic recording medium surface moderate, for example, The undercoat layer 2 is formed by providing a coating film containing particles such as SiO 2 and having a thickness of 0.005 to 0.1 μm.
【００１０】アンダーコート層２の上には、例えば斜め
蒸着装置によって金属薄膜型の第１の金属磁性膜３ａが
設けられる。例えば、１０-4〜１０-6Ｔｏｒｒ程度の真
空雰囲気下でＣｏ−Ｎｉ（８０％−２０％）合金を抵抗
加熱、高周波加熱、電子ビーム加熱などにより蒸発さ
せ、支持体１のアンダーコート層２面上に堆積（蒸着）
させることにより、第１の金属（Ｃｏ−Ｎｉ（８０％−
２０％）合金）磁性膜３ａが４００〜７００Å厚形成さ
れる。On the undercoat layer 2, a metal thin film type first metal magnetic film 3a is provided by, for example, an oblique vapor deposition apparatus. For example, in a vacuum atmosphere of about 10 −4 to 10 −6 Torr, a Co—Ni (80% -20%) alloy is evaporated by resistance heating, high frequency heating, electron beam heating, etc., and the undercoat layer 2 of the support 1 is evaporated. Deposition on the surface (vapor deposition)
The first metal (Co-Ni (80%-
20%) alloy) Magnetic film 3a is formed with a thickness of 400 to 700Å.
【００１１】上記のようにして従来の金属磁性膜の厚さ
よりも薄くした第１の金属磁性膜３ａが構成された後、
この第１の金属磁性膜３ａ上に金属磁性膜３ａの磁気特
性とは異なる第２の金属磁性膜、例えばＮｉ膜４ａが１
５０〜３００Å厚さ設けられる。この第２の金属磁性膜
４ａの成膜の手法は、第１の金属磁性膜３ａと同様な手
法が採用されても、異なる手法が採用されても良い。After the first metal magnetic film 3a having a thickness smaller than that of the conventional metal magnetic film is formed as described above,
A second metal magnetic film having a magnetic characteristic different from that of the metal magnetic film 3a, for example, a Ni film 4a is formed on the first metal magnetic film 3a.
It has a thickness of 50 to 300Å. The method of forming the second metal magnetic film 4a may be the same as that of the first metal magnetic film 3a or may be different.
【００１２】この後、第１の金属磁性膜３ａの成膜と同
様な手法を用い、そしてＣｏ−Ｎｉ（９０％−１０％）
合金を用いて、第２の金属磁性膜４ａの上に第３の金属
（Ｃｏ−Ｎｉ（９０％−１０％）合金）磁性膜３ｂを４
００〜７００Å厚形成する。そして、この後、第３の金
属磁性膜３ｂの上に第２の金属磁性膜（Ｎｉ膜）４ａの
成膜手法と同様な手法で第４の金属磁性膜（Ｎｉ膜）４
ｂが１５０〜３００Å厚さ設けられる。Thereafter, the same method as that for forming the first metal magnetic film 3a is used, and Co--Ni (90% -10%) is used.
An alloy is used to form a third metal (Co—Ni (90% -10%) alloy) magnetic film 3b on the second metal magnetic film 4a.
Form a thickness of 00 to 700Å. Then, thereafter, the fourth metal magnetic film (Ni film) 4 is formed on the third metal magnetic film 3b by the same method as the method for forming the second metal magnetic film (Ni film) 4a.
b is provided with a thickness of 150 to 300Å.
【００１３】この後、第１の金属磁性膜３ａの成膜と同
様な手法を用い、そしてＣｏ−Ｎｉ（９５％−５％）合
金を用いて、第４の金属磁性膜４ｂの上に第５の金属
（Ｃｏ−Ｎｉ（９５％−５％）合金）磁性膜３ｃを４０
０〜７００Å厚形成する。上記の金属磁性膜の成膜に際
しては、酸素を供給して行う。特に、第５の金属磁性膜
３ｃが一番上の金属磁性膜であるとした場合には、少な
くともこの金属磁性膜の形成時には酸素が吹き付けられ
ている。After that, a method similar to that of forming the first metal magnetic film 3a is used, and a Co--Ni (95% -5%) alloy is used to form a second film on the fourth metal magnetic film 4b. 5 metal (Co-Ni (95% -5%) alloy) magnetic film 3c
Form 0 to 700Å thickness. Oxygen is supplied when forming the above-mentioned metal magnetic film. Particularly, when the fifth metal magnetic film 3c is the uppermost metal magnetic film, oxygen is blown at least at the time of forming this metal magnetic film.
【００１４】この後も、必要に応じて同様に構成させ
る。但し、３層〜５層（Ｃｏ−Ｎｉ合金磁性膜は２〜３
層）程度が実際的である。勿論、これ以上の層構成であ
っても良い。つまり、従来のＣｏ−Ｎｉ合金磁性膜を、
一膜の厚さが薄い複数のＣｏ−Ｎｉ合金磁性膜で構成
し、そして各Ｃｏ−Ｎｉ合金磁性膜は支持体から遠ざか
るにつれてＮｉ含有量を減らして保磁力が大きなように
なすと共に、Ｃｏ−Ｎｉ合金磁性膜の間にはＮｉ膜を設
け、各々の磁性膜が分離・独立するように構成させたの
である。After this, the same construction is made if necessary. However, 3 to 5 layers (2 to 3 for Co-Ni alloy magnetic film)
Layer) degree is practical. Of course, a layered structure having more layers than this may be used. That is, the conventional Co-Ni alloy magnetic film is
Each Co-Ni alloy magnetic film is composed of a plurality of thin Co-Ni alloy magnetic films, and each Co-Ni alloy magnetic film reduces the Ni content as the distance from the support increases so that the coercive force becomes large. A Ni film was provided between the Ni alloy magnetic films, and the respective magnetic films were separated and independent.
【００１５】そして、このように磁性膜を構成させてい
ると、Ｃ／Ｎ特性が向上し、再生出力も高くなったので
ある。５は第５の金属磁性膜３ｃの上に設けられた潤滑
剤層である。すなわち、潤滑剤を含有させた塗料を所定
の手段で塗布することにより、約５〜５０Å、好ましく
は約１０〜３０Å程度の厚さの潤滑剤層５が設けられ
る。When the magnetic film is formed in this way, the C / N characteristic is improved and the reproduction output is also increased. Reference numeral 5 is a lubricant layer provided on the fifth metal magnetic film 3c. That is, the lubricant layer 5 having a thickness of about 5 to 50 Å, preferably about 10 to 30 Å is provided by applying a coating material containing a lubricant by a predetermined means.
【００１６】６は、基板１の他面に設けられたカーボン
ブラック等を含有させたバックコート層である。以下、
具体的な実施例を挙げて説明する。Reference numeral 6 is a back coat layer provided on the other surface of the substrate 1 and containing carbon black or the like. Less than,
A specific example is given and demonstrated.
【００１７】[0017]
〔実施例１〕厚さ１０μｍのアンダーコート層が設けら
れたＰＥＴフィルムを斜め蒸着装置に装着し、又、酸化
マグネシウム製のルツボにＣｏ−Ｎｉ（８０％−２０
％）合金を入れ、そして３０ｋＷの電子銃を作動させて
Ｃｏ−Ｎｉ（８０％−２０％）合金を蒸発させ、２ｍ／
分の走行速度で走行しているＰＥＴフィルムにＣｏ−Ｎ
ｉ（８０％−２０％）合金粒子を蒸着させ、厚さ５００
Åの第１の金属磁性膜３ａを設けた。Example 1 A PET film provided with an undercoat layer having a thickness of 10 μm was mounted on an oblique vapor deposition apparatus, and a crucible made of magnesium oxide was coated with Co—Ni (80% -20%).
%) Alloy and activated a 30 kW electron gun to evaporate the Co-Ni (80% -20%) alloy to 2 m /
Co-N on PET film running at a running speed of
i (80% -20%) alloy particles are deposited to a thickness of 500
The Å first metal magnetic film 3a is provided.
【００１８】この後、この第１の金属磁性膜３ａ上に、
厚さが１５０Åの第２の金属磁性膜膜（Ｎｉ膜）４ａを
設けた。続いて、この第２の金属磁性膜４ａの上に、Ｃ
ｏ−Ｎｉ（９０％−１０％）合金を用いて、Ｃｏ−Ｎｉ
（９０％−１０％）合金粒子を蒸着させ、厚さ５００Å
の第３の金属磁性膜３ｂを設けた。After this, on the first metal magnetic film 3a,
A second metal magnetic film film (Ni film) 4a having a thickness of 150Å was provided. Then, C is formed on the second metal magnetic film 4a.
Using an o-Ni (90% -10%) alloy, Co-Ni
(90% -10%) Evaporate alloy particles to a thickness of 500Å
The third metal magnetic film 3b was provided.
【００１９】この後、この第３の金属磁性膜３ｂ上に、
厚さが１５０Åの第４の金属磁性膜膜（Ｎｉ膜）４ｂを
設けた。続いて、この第４の金属磁性膜４ｂの上に、Ｃ
ｏ−Ｎｉ（９５％−５％）合金を用いて、Ｃｏ−Ｎｉ
（９５％−５％）合金粒子を蒸着させ、厚さ５００Åの
第５の金属磁性膜３ｃを設けた。尚、この時にも、Ｃｏ
−Ｎｉ合金粒子の蒸着時に酸素が吹き付けられている。Then, on the third metal magnetic film 3b,
A fourth metal magnetic film (Ni film) 4b having a thickness of 150Å was provided. Then, C is formed on the fourth metal magnetic film 4b.
Using an o-Ni (95% -5%) alloy, Co-Ni
(95% -5%) alloy particles were vapor-deposited to form a fifth metal magnetic film 3c having a thickness of 500Å. Even at this time, Co
-Oxygen is blown during the deposition of the Ni alloy particles.
【００２０】この後、第５の金属磁性膜３ｃの表面に潤
滑剤を塗布し、又、ＰＥＴフィルムの他面にバックコー
ト層を形成し、図１に示す如くの磁気記録媒体を得た。 〔実施例２〕実施例１において、第２の金属磁性膜膜４
ａ、及び第４の金属磁性膜膜４ｂの厚さを３００Åとし
た他は同様に行い、磁気記録媒体を得た。Then, a lubricant was applied to the surface of the fifth metal magnetic film 3c, and a back coat layer was formed on the other surface of the PET film to obtain a magnetic recording medium as shown in FIG. [Second Embodiment] In the first embodiment, the second metal magnetic film 4 is formed.
A magnetic recording medium was obtained in the same manner except that the thicknesses of a and the fourth metal magnetic film 4b were set to 300Å.
【００２１】〔実施例３〕実施例１において、第１の金
属磁性膜膜３ａ、第３の金属磁性膜膜３ｂ、及び第５の
金属磁性膜膜３ｃの厚さを８００Åとした他は同様に行
い、磁気記録媒体を得た。 〔実施例４〕厚さ１０μｍのアンダーコート層が設けら
れたＰＥＴフィルムを斜め蒸着装置に装着し、又、酸化
マグネシウム製のルツボにＣｏ−Ｎｉ（８０％−２０
％）合金を入れ、そして３０ｋＷの電子銃を作動させて
Ｃｏ−Ｎｉ（８０％−２０％）合金を蒸発させ、２ｍ／
分の走行速度で走行しているＰＥＴフィルムにＣｏ−Ｎ
ｉ（８０％−２０％）合金粒子を蒸着させ、厚さ１５０
０Åの第１の金属磁性膜３ａを設けた。[Third Embodiment] The same as the first embodiment except that the thicknesses of the first metal magnetic film 3a, the third metal magnetic film 3b, and the fifth metal magnetic film 3c are set to 800 Å. Then, a magnetic recording medium was obtained. [Example 4] A PET film provided with an undercoat layer having a thickness of 10 µm was mounted on an oblique vapor deposition apparatus, and a crucible made of magnesium oxide was coated with Co-Ni (80% -20).
%) Alloy and activated a 30 kW electron gun to evaporate the Co-Ni (80% -20%) alloy to 2 m /
Co-N on PET film running at a running speed of
i (80% -20%) alloy particles are deposited to a thickness of 150
A 0Å first metal magnetic film 3a was provided.
【００２２】この後、この第１の金属磁性膜３ａ上に、
厚さが１５０Åの第２の金属磁性膜膜（Ｎｉ膜）４ａを
設けた。続いて、この第２の金属磁性膜４ａの上に、Ｃ
ｏ−Ｎｉ（９０％−１０％）合金を用いて、Ｃｏ−Ｎｉ
（９０％−１０％）合金粒子を蒸着させ、厚さ３００Å
の第３の金属磁性膜３ｂを設けた。この時にも、Ｃｏ−
Ｎｉ合金粒子の蒸着時に酸素が吹き付けられている。Thereafter, on the first metal magnetic film 3a,
A second metal magnetic film film (Ni film) 4a having a thickness of 150Å was provided. Then, C is formed on the second metal magnetic film 4a.
Using an o-Ni (90% -10%) alloy, Co-Ni
(90% -10%) Alloy particles are vapor-deposited to a thickness of 300Å
The third metal magnetic film 3b was provided. Also at this time, Co-
Oxygen is blown during the deposition of the Ni alloy particles.
【００２３】この後、第３の金属磁性膜３ｂの表面に潤
滑剤を塗布し、又、ＰＥＴフィルムの他面にバックコー
ト層を形成し、磁気記録媒体を得た。 〔比較例１〕厚さ１０μｍのアンダーコート層が設けら
れたＰＥＴフィルムを斜め蒸着装置に装着し、又、酸化
マグネシウム製のルツボにＣｏ−Ｎｉ（８０％−２０
％）合金を入れ、そして３０ｋＷの電子銃を作動させて
Ｃｏ−Ｎｉを蒸発させ、２ｍ／分の走行速度で走行して
いるＰＥＴフィルムにＣｏ−Ｎｉ粒子を厚さ１８００Å
蒸着させた。尚、Ｃｏ−Ｎｉ合金粒子の蒸着時に酸素は
吹き付けられている。Then, a lubricant was applied to the surface of the third metal magnetic film 3b, and a back coat layer was formed on the other surface of the PET film to obtain a magnetic recording medium. [Comparative Example 1] A PET film provided with an undercoat layer having a thickness of 10 µm was attached to an oblique vapor deposition apparatus, and Co-Ni (80% -20%) was attached to a crucible made of magnesium oxide.
%) Alloy, and actuate a 30 kW electron gun to evaporate Co-Ni and deposit Co-Ni particles on a PET film running at a running speed of 2 m / min to a thickness of 1800Å.
It was vapor-deposited. It should be noted that oxygen was blown during the deposition of the Co—Ni alloy particles.
【００２４】この後、金属磁性膜の表面に潤滑剤を塗布
し、又、ＰＥＴフィルムの他面にバックコート層を形成
し、磁気記録媒体を得た。 〔特性〕上記各例で得られた磁気記録媒体の再生特性及
び耐蝕性について調べたので、その結果を下記の表−１
に示す。After that, a lubricant was applied to the surface of the metal magnetic film, and a back coat layer was formed on the other surface of the PET film to obtain a magnetic recording medium. [Characteristics] The reproducing characteristics and the corrosion resistance of the magnetic recording media obtained in the above examples were examined, and the results are shown in Table 1 below.
Shown in.
【００２５】 表−１ 再 生 出 力（ｄＢ） Ｃ／Ｎ（ｄＢ） ΔＢｓ（％） １ＭＨｚ ７ＭＨｚ 実施例１ −０．５ ＋４．６ ５．０ ５ 実施例２ −０．３ ＋４．４ ４．７ ４ 実施例３ ＋０．２ ＋４．９ ５．２ ４ 実施例４ ＋０．２ ＋２．６ ３．９ ４ 比較例１ ０ ０ ０ ３ これによれば、Ｃｏを主成分とする金属磁性膜が複数個
設けられると共に、これらＣｏを主成分とする金属磁性
膜の間に前記磁性膜の磁気特性とは異なる磁気特性の金
属磁性膜が設けられてなる本発明の磁気記録媒体は、Ｃ
／Ｎが高く、かつ、高域での再生出力が高いことが判
る。Table-1 Regenerated power (dB) C / N (dB) ΔBs (%) 1 MHz 7 MHz Example 1 -0.5 +4.6 5.0 5 Example 2 -0.3 +4.4 4 0.7 4 Example 3 +0.2 +4.9 5.2 4 Example 4 +0.2 +2.6 3.9 4 Comparative Example 1 0 0 0 3 According to this, a metal magnetic film containing Co as a main component. The magnetic recording medium of the present invention is provided with a plurality of metal magnetic films having a magnetic characteristic different from that of the magnetic film between the metal magnetic films containing Co as a main component.
It can be seen that / N is high and the reproduction output in the high range is high.
【００２６】[0026]
【効果】高域での再生出力が高く、Ｃ／Ｎも高い特長が
奏される。[Effect] High playback output in the high frequency range and high C / N.
【図１】磁気記録媒体の概略断面図である。FIG. 1 is a schematic cross-sectional view of a magnetic recording medium.
１ 支持体 ３ａ，３ｂ，３ｃ Ｃｏ−Ｎｉ合金磁性膜 ４ａ，４ｂ Ｎｉ磁性膜 ５ 潤滑剤層 ６ バックコート層 1 Supports 3a, 3b, 3c Co-Ni alloy magnetic film 4a, 4b Ni magnetic film 5 Lubricant layer 6 Back coat layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 志賀 章 栃木県芳賀郡市貝町大字赤羽2606 花王株 式会社情報科学研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Shiga 2606 Akabane, Kai-cho, Haga-gun, Tochigi Prefecture Kao Co., Ltd.
Claims (9)
設けられると共に、これらＣｏを主成分とする金属磁性
膜の間に前記磁性膜の磁気特性とは異なる磁気特性の金
属磁性膜が設けられてなることを特徴とする磁気記録媒
体。1. A plurality of metal magnetic films containing Co as a main component are provided, and a metal magnetic film having magnetic properties different from those of the magnetic films is provided between the metal magnetic films containing Co as a main component. A magnetic recording medium characterized by being provided.
属磁性膜のうち、支持体から遠ざかる金属磁性膜ほど保
磁力が大きなようにＣｏを主成分とする金属磁性膜が構
成されてなることを特徴とする請求項１の磁気記録媒
体。2. A metal magnetic film containing Co as a main component is formed so that, out of a plurality of metal magnetic films containing Co as a main component, the metal magnetic film farther from the support has a larger coercive force. The magnetic recording medium according to claim 1, wherein:
１００〜２０００Åであることを特徴とする請求項１ま
たは請求項２の磁気記録媒体。3. The magnetic recording medium according to claim 1, wherein the thickness of the metallic magnetic film containing Co as a main component is 100 to 2000 Å.
は、支持体に一番近い金属磁性膜の膜厚を１とすると、
上層の膜厚が１〜１／１０の厚さになるよう構成されて
なることを特徴とする請求項１〜請求項３の磁気記録媒
体。4. The film thickness of the metal magnetic film containing Co as a main component is set such that the film thickness of the metal magnetic film closest to the support is 1.
4. The magnetic recording medium according to claim 1, wherein the upper layer has a thickness of 1 to 1/10.
Ｎｉ系合金で構成されてなることを特徴とする請求項１
〜請求項４の磁気記録媒体。5. The metal magnetic film containing Co as a main component is Co--
2. A Ni-based alloy as a constituent.
~ The magnetic recording medium according to claim 4.
Ｎｉ系合金で構成されてなり、このＣｏ−Ｎｉ系合金磁
性膜のうち支持体から遠ざかる金属磁性膜ほどＮｉ含有
量が少なくなるよう構成されてなることを特徴とする請
求項１〜請求項５の磁気記録媒体。6. The metal magnetic film containing Co as a main component is Co--
6. A Ni-based alloy magnetic film, wherein a metal magnetic film of the Co—Ni-based alloy magnetic film that is farther from the support has a smaller Ni content. Magnetic recording medium.
Ｎｉ系合金で構成されてなり、このＣｏ−Ｎｉ系合金磁
性膜のうち支持体に一番近い金属磁性膜のＮｉ含有量が
６〜２０ｗｔ％であって、遠ざかるにつれてＮｉ含有量
が少なくなり、一番遠い金属磁性膜のＮｉ含有量が５〜
１９ｗｔ％であるよう構成されてなることを特徴とする
請求項１〜請求項６の磁気記録媒体。7. The metal magnetic film containing Co as a main component is Co--
Of the Co-Ni alloy magnetic film, the Ni content of the metal magnetic film closest to the support is 6 to 20 wt%, and the Ni content decreases as the distance increases. The farthest metal magnetic film has a Ni content of 5 to
The magnetic recording medium according to claim 1, wherein the magnetic recording medium is configured to have a content of 19 wt%.
けられる金属磁性膜の厚さが１００〜５００Åであるこ
とを特徴とする請求項１の磁気記録媒体。8. The magnetic recording medium according to claim 1, wherein the thickness of the metal magnetic film provided between the metal magnetic films containing Co as a main component is 100 to 500 Å.
けられる金属磁性膜がＮｉで構成されてなることを特徴
とする請求項１または請求項８の磁気記録媒体。9. The magnetic recording medium according to claim 1, wherein the metal magnetic film provided between the metal magnetic films containing Co as a main component is made of Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20649293A JPH0765347A (en) | 1993-08-20 | 1993-08-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20649293A JPH0765347A (en) | 1993-08-20 | 1993-08-20 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0765347A true JPH0765347A (en) | 1995-03-10 |
Family
ID=16524273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20649293A Pending JPH0765347A (en) | 1993-08-20 | 1993-08-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765347A (en) |
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-
1993
- 1993-08-20 JP JP20649293A patent/JPH0765347A/en active Pending
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