JPS63144419A - Magnetic recording medium and its production - Google Patents
Magnetic recording medium and its productionInfo
- Publication number
- JPS63144419A JPS63144419A JP29070486A JP29070486A JPS63144419A JP S63144419 A JPS63144419 A JP S63144419A JP 29070486 A JP29070486 A JP 29070486A JP 29070486 A JP29070486 A JP 29070486A JP S63144419 A JPS63144419 A JP S63144419A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- particles
- layer
- magnetic layer
- magnetic particles
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 108
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000006249 magnetic particle Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 23
- 230000005389 magnetism Effects 0.000 claims abstract description 11
- 230000005292 diamagnetic effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 16
- 150000002500 ions Chemical class 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000007772 electroless plating Methods 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 5
- 239000002889 diamagnetic material Substances 0.000 claims description 4
- 239000008151 electrolyte solution Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 3
- 239000003792 electrolyte Substances 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 description 1
- 229940074439 potassium sodium tartrate Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/743—Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
- G11B5/746—Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、フロッピーディスク、ハードディスク、カセ
ットテープ等としての磁気記録媒体と、その製造方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic recording medium such as a floppy disk, hard disk, cassette tape, etc., and a method for manufacturing the same.
［従来技術］
この種の磁気記録媒体においては、記録密度の向上が今
日最も重要な技術課題の１つとなっている。ところでこ
の記録密度の主要パラメータは、保磁力Ｈｃ、残留磁束
３ｒ、及び磁気記録層の厚ざδであるが、これらパラメ
ータと電磁気特性とは次の関係にある。すなわち、磁気
ヘッドの再生出力をＥ、再生波形の波形幅をＷとすると
、Ｅ ｃｃ Ｂｒ−（Ｈｃ／Ｂｒ） ・δＷ ”
（Ｓｒ／ｌ−１ｃ）’ −δ“ここで、α＝０．８
５〜０．５０
β＝０．１５〜０．５０
そこで磁気記録媒体としての記録密度を向上させるには
再生出力Ｅの低下をできるだけ抑え、波形幅Ｗを極力小
ざくすればよいことになる。そのためには上記関係より
保磁力）−（Ｃを大きくすればよいことは明らかでおる
。[Prior Art] In this type of magnetic recording medium, improving the recording density is one of the most important technical issues today. By the way, the main parameters of this recording density are the coercive force Hc, the residual magnetic flux 3r, and the thickness difference δ of the magnetic recording layer, and these parameters and the electromagnetic characteristics have the following relationship. That is, if the reproduction output of the magnetic head is E and the waveform width of the reproduction waveform is W, then E cc Br-(Hc/Br) ・δW ”
(Sr/l-1c)'-δ"Here, α=0.8
5 to 0.50 β=0.15 to 0.50 Therefore, in order to improve the recording density of a magnetic recording medium, it is necessary to suppress the decrease in the reproduction output E and to make the waveform width W as small as possible. For this purpose, it is clear from the above relationship that coercive force)-(C should be increased.
［発明が解決しようとする問題点］
しがしながら、保磁力ＨＣと磁気記録層の厚ざδとは、
従来、第４図に実線の曲線で示したように大概反比例の
関係にある。したがって保磁力ＨＣを大きくしようとす
ると、磁気記録層の厚ざδを薄クシなければならない。[Problems to be solved by the invention] However, the coercive force HC and the thickness difference δ of the magnetic recording layer are
Conventionally, as shown by the solid curve in FIG. 4, there has been an almost inversely proportional relationship. Therefore, in order to increase the coercive force HC, the thickness difference δ of the magnetic recording layer must be reduced.
しかし近年、磁気記録の高密度化の要請から既に超薄膜
化へ移行してきており、これ以上磁気記録媒体の厚さδ
を簿くすることは品質管理上限界がおる。また、磁気記
録層の厚ざδを薄くすることは再生出力Ｅを低下させる
ことになり、ざらにその分残留磁束１３ｒを大きくして
カバーしようとすれば、今度は波形幅Ｗが大きくなって
、却って記録密度を低下させることになるという問題が
ある。However, in recent years, the demand for higher density magnetic recording has already led to a shift to ultra-thin films, and the thickness δ of magnetic recording media has become even thinner.
There is a limit to quality control in keeping records. In addition, reducing the thickness difference δ of the magnetic recording layer will reduce the reproduction output E, and if you try to compensate for this by increasing the residual magnetic flux 13r, the waveform width W will increase this time. However, there is a problem in that the recording density is actually reduced.
［発明の目的コ
本発明はかかる従来の問題点に鑑みて為されたもので、
その目的とするところは、磁気記録層の厚さを薄クシな
くとも高い保磁力が得られる磁気記録媒体と、その製造
方法を提供するにある。これにより磁気記録媒体として
の記録密度の向上を図らんとするものである。[Object of the Invention] The present invention has been made in view of such conventional problems,
The object is to provide a magnetic recording medium that can obtain a high coercive force without reducing the thickness of the magnetic recording layer, and a method for manufacturing the same. This is intended to improve the recording density of the magnetic recording medium.
［問題点を解決するための手段］
かかる目的を達成するため本発明に係る磁気記録媒体は
基材表面に形成される磁性粒子の集合体としての磁性層
の表面に無数の磁性粒子間隙が形成され、該磁性粒子間
隙に該磁性粒子よりも磁性が弱いか、非磁性、又は反磁
性の材料が介在されることを要旨としている。[Means for Solving the Problems] In order to achieve the above object, the magnetic recording medium according to the present invention has a magnetic recording medium in which numerous gaps between magnetic particles are formed on the surface of the magnetic layer, which is an aggregate of magnetic particles formed on the surface of the base material. The gist is that a material that is weaker in magnetism than the magnetic particles, or is non-magnetic or diamagnetic is interposed between the magnetic particles.
また、本発明に係る磁気記録媒体の１つの製造方法は、
基材表面に形成される磁性粒子の集合体としての磁性層
の表面に、該磁性粒子に対して真の平衡電位をもつ粒子
を略均一な分散状態で付着させ、次にこの材料を電解質
液に浸漬して前記貴の平衡電位をもつ粒子と磁性層との
局部電池作用により該磁性層の表面に電食孔を形成させ
、しかる後、この電食孔中に前記磁性粒子よりも磁性が
弱いか、非磁性、又は反磁性の材料を埋め込むことを要
旨としている。Further, one method for manufacturing a magnetic recording medium according to the present invention is as follows:
Particles having a true equilibrium potential with respect to the magnetic particles are adhered to the surface of the magnetic layer, which is an aggregate of magnetic particles formed on the surface of the base material, in a substantially uniformly dispersed state, and then this material is placed in an electrolyte solution. The electrolytic holes are formed on the surface of the magnetic layer by the local battery action of the particles with the noble equilibrium potential and the magnetic layer, and then the electrolytic holes have more magnetic properties than the magnetic particles. The idea is to embed weak, non-magnetic, or diamagnetic materials.
さらに、本発明に係る磁気記録媒体の別の製造方法は、
基材表面に磁性粒子の集合体としての磁性層が形成され
る材料を、該磁性粒子に対して責の平衡電位をもつ原子
イオンを含む無電解メッキ液に浸漬して該原子イオンを
前記磁性層の表面に析出させると共に、該析出粒子と前
記磁性層との局部電池作用により該磁性層の表面に電食
孔を形成させ、次にこの電食孔中に前記磁性粒子よりも
磁性が弱いか非磁性、又は反磁性の材料を埋め込むこと
を要旨としている。Furthermore, another method for manufacturing a magnetic recording medium according to the present invention includes:
A material on which a magnetic layer as an aggregate of magnetic particles is formed on the surface of the base material is immersed in an electroless plating solution containing atomic ions having a balanced potential with respect to the magnetic particles. At the same time as being deposited on the surface of the layer, electrolytic holes are formed on the surface of the magnetic layer by the local battery action of the precipitated particles and the magnetic layer, and then the electrolytic holes have weaker magnetism than the magnetic particles. The idea is to embed a non-magnetic or diamagnetic material.
［作用］
このように構成された本発明に係る磁気記録媒体によれ
ば、磁性層の表面の各磁性粒子が、その周囲を弱磁性か
、非磁性、又は反磁性の材料により取り囲まれて孤立化
されている。そのために磁気特性としての磁壁移動抵抗
が大きくなり、磁性層の厚さが同程度であれば、より高
い保磁力が得られる。[Function] According to the magnetic recording medium according to the present invention configured as described above, each magnetic particle on the surface of the magnetic layer is surrounded by a weakly magnetic, nonmagnetic, or diamagnetic material and becomes isolated. has been made into Therefore, the domain wall movement resistance as a magnetic property increases, and if the thickness of the magnetic layer is about the same, a higher coercive force can be obtained.
［実施例］
第１図は、本発明の一実施例に係る磁気記録媒体を示し
たものである。この図においては、例えば、アルミニウ
ム基板上に非磁性のＮ１−Ｐ系結品粒子の集合体である
非磁性層が形成された基材１の表面に、強磁性のＣｏ−
Ｐ未結晶粒子の集合体である磁性層２が形成されている
。この磁性層２の厚さは、約５００〜７００Ａ程度であ
るが、その表面には径、深さともに約１００〜２ｏｏ入
程度の微小孔３，３・・・が各磁性粒子間の間隙に位置
して無数に介在され、該各機小孔３中に前記ｃｏ−ｐ系
磁性粒子よりも磁性の弱い、又は、非磁性か反磁性の材
料４が介在されている。ちなみにこの実施例では非磁性
材料で必る銀（Ａｇ）粒子が介在されている。[Example] FIG. 1 shows a magnetic recording medium according to an example of the present invention. In this figure, for example, a ferromagnetic Co-
A magnetic layer 2, which is an aggregate of P uncrystallized particles, is formed. The thickness of this magnetic layer 2 is approximately 500 to 700 A, and the surface thereof has micropores 3, 3, . In each of the small holes 3, a material 4 that is weaker in magnetism than the co-p magnetic particles, or is non-magnetic or diamagnetic is interposed. Incidentally, in this example, silver (Ag) particles, which are a necessary non-magnetic material, are interposed.
次にこの磁気記録媒体の製造方法について述べる。その
１つの方法は、第２図にも示したように、初めに基材１
表面のＣｏ−Ｐ系磁性層２の表面に、このＣｏ−Ｐ磁性
粒子に対して責の平衡電位をもつＡｇ粒子４を略均一な
分散状態で付着させる。Next, a method for manufacturing this magnetic recording medium will be described. One method is to first prepare the base material 1, as shown in Figure 2.
Ag particles 4 having an equilibrium potential equal to that of the Co-P magnetic particles are adhered to the surface of the Co--P magnetic layer 2 in a substantially uniformly dispersed state.
この手段としては、既に慣用技術となっているスパッタ
リング法、蒸着法、或いはイオンブレーティング法等が
適用される。次にこのようにして得られた材料を次表に
示す液組成の電解質液中に浸漬（液温的８０℃、浸漬時
間３０秒〜１分間）する。As this means, a sputtering method, a vapor deposition method, an ion blating method, etc., which are already commonly used techniques, are applied. Next, the material thus obtained is immersed in an electrolyte solution having a liquid composition shown in the following table (liquid temperature: 80 DEG C., immersion time: 30 seconds to 1 minute).
ＣＯ３Ｏ４１５ｇ／ｊ！
ＮａＨ２ＰＯ２２０ｇ／ノ
（ＮＨ４） ２ Ｓ０４ ８０ｇ／ノ酒
石酸カリウムナトリウム ２００ｇ／ノＡに］Ｉ
２０ｍｇ／ノＮａＣＮ
１０ｍｇ／ｉ！Ｎａ０ｆ−１（ｐＨ調整用）
ｐＨ１０そうするとＡｃ７粒子４が一極、磁性層２
が子種としての局部電池が形成され、その酸化還元反応
作用により磁性層２表面に無数の電食孔３，３・・・が
形成される。このようにして得られた材料はその電ｗ！
−質液から取り出した後、その表面をポリッシング研磨
し、磁性層２表面のＡ（Ｊ粒子を電食孔３中に埋め込ま
せるものでおる。この場合、Ａｃ７粒子４の平衡電位が
Ｃｏ−Ｐ磁性粒子に対して員でおると同時に、非磁性材
料でもあるためにかかる方法を取り得るものである。そ
して、磁性Ｍ２表面にイオンブレーティング法等により
付着される材料と、電食孔３中に埋め込まれる材料とが
同一のものであることによって製造工程が楽に進められ
るものでおる。なお、磁性層２の表面に付着される材料
は必ずしもＡｇである必要はなく、要するに、電解質液
中における局部電池の形成において一極となる材料を選
択すればよい。ちなみにＡｇ以外の材料としてＡｕ、Ｃ
ｕ等も適用できる。CO3O415g/j! NaH2PO220g/(NH4)2S04 80g/potassium sodium tartrate 200g/noA]I
20mg/NaCN
10mg/i! Na0f-1 (for pH adjustment)
pH 10 Then Ac7 particle 4 is one pole, magnetic layer 2
A local battery is formed as a seed, and numerous electrolytic corrosion holes 3, 3, . . . are formed on the surface of the magnetic layer 2 due to the redox reaction. The material obtained in this way is so electric!
- After taking it out from the liquid, the surface is polished to embed the A (J particles on the surface of the magnetic layer 2 into the electrolytic corrosion holes 3. In this case, the equilibrium potential of the Ac7 particles 4 is Co-P This method can be used because it is a non-magnetic material as well as a member of the magnetic particles.Then, the material attached to the surface of the magnetic M2 by an ion blating method etc. and the material inside the electrolytic corrosion hole 3 The manufacturing process is facilitated by the fact that the material embedded in the magnetic layer 2 is the same as the material embedded in the magnetic layer 2.The material attached to the surface of the magnetic layer 2 does not necessarily have to be Ag; All you have to do is select a material that will serve as one pole in the formation of the local battery.Incidentally, materials other than Ag include Au and C.
u etc. can also be applied.
第３図は更に本発明の別の製造方法を示している。この
方法では、前述の基材１表面にＣｏ−Ｐ磁性粒子の磁性
層２が形成された材料を、このｃｏ−ＰＦｌｉ性粒子に
対して貴の平衡電位をもつ原子（Ａｇ）イオンを含む無
電解メッキ液に浸漬する。FIG. 3 further shows another manufacturing method of the present invention. In this method, a material in which a magnetic layer 2 of Co-P magnetic particles is formed on the surface of the base material 1 described above is used as a material containing atoms (Ag) ions having a noble equilibrium potential with respect to the co-PFli particles. Immerse in electrolytic plating solution.
この無電解メッキ液は、この実施例では既述の表に示し
た液組成と同一のものを用いている。かくしてこの場合
には磁性層２表面にＡ（Ｊ粒子４が析出すると共に、こ
の析出したＡｇ粒子４が一極、磁性層２が子種としての
局部電池が形成され、その酸化還元電解作用により磁性
層２表面に無数の電食孔３，３・・・が形成される。こ
の材料を無電解メッキ液から取り出してその表面をポリ
ッシング研磨し、Ａｃ２粒子４を電食孔３中に埋め込ま
せることは、先の方法の場合と同様である。この後の製
造方法によれば、１つの工程で磁性層２表面へのＡｇ粒
子４の析出と、局部電池作用による磁性層２表面の電食
孔３の形成とが行なわれるので、１工程省略される。In this embodiment, the electroless plating solution used has the same composition as shown in the table above. Thus, in this case, A (J particles 4) are deposited on the surface of the magnetic layer 2, and a local battery is formed in which the deposited Ag particles 4 serve as one pole and the magnetic layer 2 serves as a child seed, and due to the redox electrolytic action of the Numerous electrolytic holes 3, 3... are formed on the surface of the magnetic layer 2. This material is taken out of the electroless plating solution and its surface is polished, and Ac2 particles 4 are embedded in the electrolytic holes 3. This is the same as in the case of the previous method. According to the subsequent manufacturing method, the precipitation of Ag particles 4 on the surface of the magnetic layer 2 and the electrolytic corrosion of the surface of the magnetic layer 2 due to the local battery action are performed in one step. Since the formation of the hole 3 is performed, one step is omitted.
しかしてこのように構成された磁気記録媒体の保磁力Ｈ
Ｃと磁性層２の厚さδとの関係を、第４図中に破線で示
して従来品と比較した。その結果、従来品は既に述べた
ように、磁性層２の厚さが増すようにつれて保磁力が略
反比例的に急低下していくのに対し、本発明品はこの図
からも明らかなように、磁性層２の厚さが増しても保磁
力がほとんど低下せず、高い値が保持されている。この
ような結果が得られたのは、磁性層２の表面の各磁性粒
子が、その周囲をＡｃ１粒子４により取り囲まれて孤立
化し、それにより、磁気特性としての磁壁移動抵抗が大
きくなったためと考えられる。However, the coercive force H of the magnetic recording medium constructed in this way
The relationship between C and the thickness δ of the magnetic layer 2 is shown by the broken line in FIG. 4 and compared with the conventional product. As a result, as mentioned above, in the conventional product, as the thickness of the magnetic layer 2 increases, the coercive force rapidly decreases almost inversely proportionally, whereas in the product of the present invention, as is clear from this figure, Even if the thickness of the magnetic layer 2 increases, the coercive force hardly decreases and remains at a high value. This result was obtained because each magnetic particle on the surface of the magnetic layer 2 was surrounded by Ac1 particles 4 and became isolated, which increased the domain wall movement resistance as a magnetic property. Conceivable.
なあ、第５図はこの後の製造方法において材料を無電解
メッキ液中へ浸漬してからの浸ａ時間（Ｔ＞と保磁力（
Ｈｃ）及び飽和磁束（Ｍｓ）との関係を示したものでお
る。この図から判ることは、浸漬時間が長くなるにつれ
て保磁力が上昇するが、一方、飽和磁束は極くわずかし
か低下していないことである。この飽和磁束は磁性Ｍ２
の厚さと相関性があるから、磁性層２の厚さがそれ程薄
くなっていないのに保磁力が上昇していることを意味し
ている。By the way, Figure 5 shows the immersion time a (T> and coercive force (
This figure shows the relationship between Hc) and saturation magnetic flux (Ms). It can be seen from this figure that as the immersion time increases, the coercive force increases, while the saturation magnetic flux decreases only slightly. This saturation magnetic flux is magnetic M2
Since there is a correlation with the thickness of , this means that the coercive force has increased even though the thickness of the magnetic layer 2 has not become much thinner.
なお、上記した実施例に用いたＡＱは比較的硬さの低い
材料であるため、この材料が磁性層２の表面に介在され
ることによって磁性層２表面の自己油滑性が良くなり、
磁気ヘッドの摺動性が高められる。また、磁性層２の磁
性粒子より貴の平衡電位をもつ材料を磁性層２表面に介
在させることで耐食性も良くなる。Note that since the AQ used in the above-mentioned examples is a material with relatively low hardness, by interposing this material on the surface of the magnetic layer 2, the self-lubricating property of the surface of the magnetic layer 2 is improved.
The sliding properties of the magnetic head are improved. Further, by interposing a material having a nobler equilibrium potential than the magnetic particles of the magnetic layer 2 on the surface of the magnetic layer 2, corrosion resistance is also improved.
なお、上記各実施例では磁性層２の表面に微小孔３，３
・・・を形成させる手段として電食法を適用したが、例
えば逆に、磁性層２の表面に磁性粒子を析出させ、その
粒子を核として微小孔の層を析出形成させる電析法を用
いてもよい。In each of the above embodiments, micro holes 3, 3 are formed on the surface of the magnetic layer 2.
Although the electrolytic corrosion method was applied as a means to form ..., for example, an electrodeposition method in which magnetic particles are deposited on the surface of the magnetic layer 2 and a layer of micropores is deposited and formed using the particles as nuclei is used. You can.
［発明の効果］
以上説明したように、本発明に係る磁気記録媒体によれ
ば、磁気記録層の厚さをそれ程薄くしなくとも高い保磁
力が得られる。また、そのことは再生出力の低下を回避
できることにもなり、さらに残留磁束を必要以上に大き
くしなくて済むため再生波形幅の抑制にもなる。したが
って磁気記録密度の大幅な向上が図れ、薄膜高密度の磁
気記録化の要請に応え得るものである。[Effects of the Invention] As explained above, according to the magnetic recording medium according to the present invention, a high coercive force can be obtained without reducing the thickness of the magnetic recording layer so much. Moreover, this also makes it possible to avoid a decrease in the reproduction output, and furthermore, it is possible to suppress the reproduction waveform width since it is not necessary to increase the residual magnetic flux more than necessary. Therefore, the magnetic recording density can be greatly improved and the demand for thin film high density magnetic recording can be met.
第１図は本発明の一実施例に係る磁気記録媒体の断面図
、第２図はこの磁気記録媒体の第１の製造方法について
の製造工程の説明図、第３図は、本発明の第２の製造方
法についての製造工程の説明図、第４図は本発明に係る
磁気記録媒体と従来品との磁気記録特性（Ｉ堆層の厚さ
と保磁力との関係）の比較データを示す図、第５図はこ
の第２の製造方法にお（プる材料の無電解メッキ液中へ
の浸漬時間と保磁力及び飽和磁束との関係の説明図であ
る。
１・・・基材、２・・・磁性層、３・・・微小孔（電食
孔）、４・・・非磁性材料（ＡＣＪ粒子）。FIG. 1 is a cross-sectional view of a magnetic recording medium according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the manufacturing process of a first manufacturing method of this magnetic recording medium, and FIG. 3 is a cross-sectional view of a magnetic recording medium according to an embodiment of the present invention. 2 is an explanatory diagram of the manufacturing process for the manufacturing method of No. 2, and FIG. 4 is a diagram showing comparative data of the magnetic recording characteristics (relationship between the thickness of the I-layer and the coercive force) between the magnetic recording medium according to the present invention and a conventional product. , FIG. 5 is an explanatory diagram of the relationship between the immersion time of the material applied in the second manufacturing method in the electroless plating solution, coercive force, and saturation magnetic flux. 1... Base material, 2 . . . Magnetic layer, 3. Micropores (electrolytic holes), 4. Nonmagnetic material (ACJ particles).
Claims (1)
性層の表面に無数の磁性粒子間隙が形成され、該磁性粒
子間隙に該磁性粒子よりも磁性が弱いか、非磁性、又は
反磁性の材料が介在されてなることを特徴とする磁気記
録媒体。 ２、基材表面に形成される磁性粒子の集合体としての磁
性層の表面に、該磁性粒子に対して貴の平衡電位をもつ
粒子を略均一な分散状態で付着させ、次にこの材料を電
解質液に浸漬して前記貴の平衡電位をもつ粒子と磁性層
との局部電池作用により該磁性層の表面に電食孔を形成
させ、しかる後、この電食孔中に前記磁性粒子よりも磁
性が弱いか、非磁性、又は反磁性の材料を埋め込むよう
にしたことを特徴とする磁気記録媒体の製造方法。 ３、基材表面に磁性粒子の集合体としての磁性層が形成
される材料を、該磁性粒子に対して貴の平衡電位をもつ
原子イオンを含む無電解メッキ液に浸漬して該原子イオ
ンを前記磁性層の表面に析出させると共に、該析出粒子
と前記磁性層との局部電池作用により該磁性層の表面に
電食孔を形成させ、次にこの電食孔中に前記磁性粒子よ
りも磁性が弱いか非磁性、又は反磁性の材料を埋め込む
ようにしたことを特徴とする磁気記録媒体の製造方法。[Claims] 1. Innumerable gaps between magnetic particles are formed on the surface of the magnetic layer as an aggregate of magnetic particles formed on the surface of the base material, and the gap between the magnetic particles has weaker magnetism than the magnetic particles. A magnetic recording medium characterized in that a non-magnetic or diamagnetic material is interposed therebetween. 2. On the surface of the magnetic layer, which is an aggregate of magnetic particles formed on the surface of the base material, particles having a noble equilibrium potential with respect to the magnetic particles are adhered in a substantially uniformly dispersed state, and then this material is Electrolytic holes are formed on the surface of the magnetic layer by the local cell action of the magnetic layer and the particles having the noble equilibrium potential by being immersed in the electrolytic solution, and then, in the electrolytic hole, more than the magnetic particles 1. A method for manufacturing a magnetic recording medium, characterized in that a material with weak magnetism, non-magnetic properties, or diamagnetic properties is embedded. 3. A material on which a magnetic layer as an aggregate of magnetic particles is formed on the surface of the base material is immersed in an electroless plating solution containing atomic ions having a noble equilibrium potential with respect to the magnetic particles to remove the atomic ions. At the same time as depositing on the surface of the magnetic layer, electrolytic holes are formed on the surface of the magnetic layer by the local cell action of the precipitated particles and the magnetic layer, and then in the electrolytic holes there are particles that are more magnetic than the magnetic particles. 1. A method for producing a magnetic recording medium, comprising embedding a material that is weakly magnetic, non-magnetic, or diamagnetic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61290704A JP2521932B2 (en) | 1986-12-05 | 1986-12-05 | Method of manufacturing magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61290704A JP2521932B2 (en) | 1986-12-05 | 1986-12-05 | Method of manufacturing magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63144419A true JPS63144419A (en) | 1988-06-16 |
| JP2521932B2 JP2521932B2 (en) | 1996-08-07 |
Family
ID=17759431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61290704A Expired - Lifetime JP2521932B2 (en) | 1986-12-05 | 1986-12-05 | Method of manufacturing magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2521932B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS619824A (en) * | 1984-06-25 | 1986-01-17 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| JPS61220128A (en) * | 1985-03-26 | 1986-09-30 | Hitachi Metals Ltd | Magnetic recording medium |
-
1986
- 1986-12-05 JP JP61290704A patent/JP2521932B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS619824A (en) * | 1984-06-25 | 1986-01-17 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| JPS61220128A (en) * | 1985-03-26 | 1986-09-30 | Hitachi Metals Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2521932B2 (en) | 1996-08-07 |
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