JPS627605B2 - - Google Patents
Info
- Publication number
- JPS627605B2 JPS627605B2 JP54061506A JP6150679A JPS627605B2 JP S627605 B2 JPS627605 B2 JP S627605B2 JP 54061506 A JP54061506 A JP 54061506A JP 6150679 A JP6150679 A JP 6150679A JP S627605 B2 JPS627605 B2 JP S627605B2
- Authority
- JP
- Japan
- Prior art keywords
- base layer
- recording medium
- underlayer
- recording
- recording density
- 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.)
- Expired
Links
- 229910018104 Ni-P Inorganic materials 0.000 claims description 21
- 229910018536 Ni—P Inorganic materials 0.000 claims description 21
- 238000007747 plating Methods 0.000 claims description 19
- 230000005294 ferromagnetic effect Effects 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 15
- 229910052737 gold Inorganic materials 0.000 description 7
- 230000005291 magnetic effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
本発明はNi−Ｐ等を下地として電気めつき法
あるいは化学めつき法で強磁性合金薄膜を形成し
た記録媒体に関するもので、更に詳しくは２種以
上の中間下地層を形成することにより記録密度特
性と信号対雑音比（SNR）を改良した磁気記録
媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording medium in which a ferromagnetic alloy thin film is formed using Ni-P or the like as a base layer by electroplating or chemical plating. The present invention relates to a magnetic recording medium that improves recording density characteristics and signal-to-noise ratio (SNR) by forming a magnetic recording medium.
磁気デイスク用記録媒体の一般的な製造法はγ
−Fe2O3磁性粉末と結合用樹脂とを有機溶剤で混
合撹拌し、その磁性塗料をデイスク基板上に滴下
して遠心力により適当な厚みの磁性膜を形成する
ことであつた。しかしこの方法で形成され、実用
化された塗布形記録媒体の残留磁束密度Brは
900Gauss前後であり、また保磁力Hcも300Oe前
後と低く、さらに記録媒体の表面粗さも0.2μｍ
Ra以下にすることは困難であることなどにより
600BPM（bit permm）以上の記録密度を得ること
は困難になつている。 The general manufacturing method for magnetic disk recording media is γ
-Fe 2 O 3 magnetic powder and binding resin were mixed and stirred in an organic solvent, and the magnetic paint was dropped onto the disk substrate to form a magnetic film of appropriate thickness by centrifugal force. However, the residual magnetic flux density Br of the coated recording medium formed by this method and put into practical use is
It is around 900 Gauss, and the coercive force Hc is low at around 300 Oe, and the surface roughness of the recording medium is also 0.2 μm.
Due to the fact that it is difficult to reduce the
It is becoming difficult to obtain a recording density of 600 BPM (bits per mm) or higher.
これに対してCo、Ni、Fe等を主構成元素とし
電気めつき法や化学めつき法により形成される強
磁性合金薄膜記録媒体（以後めつき媒体と呼ぶ）
はBr〓8000〜10000Gaussもあり、Hcもめつき液
組成やめつき条件（温度、PH等）の制御により
600Oeから1000Oeを越える高保磁力を容易に得
ることができ、表面粗さも0.01μｍRa以下であ
り、700BPM以上の高記録密度が得られる。 On the other hand, a ferromagnetic alloy thin film recording medium (hereinafter referred to as a plated medium) whose main constituent elements include Co, Ni, Fe, etc., is formed by electroplating or chemical plating.
Br〓8000~10000Gauss is also available, and by controlling the Hc plating liquid composition and plating conditions (temperature, PH, etc.)
A high coercive force of 600 Oe to over 1000 Oe can be easily obtained, the surface roughness is less than 0.01 μm Ra, and a high recording density of 700 BPM or more can be obtained.
第１図は電気めつき法または化学めつき法によ
り形成された従来のめつき媒体の構成図である。 FIG. 1 is a block diagram of a conventional plating medium formed by electroplating or chemical plating.
第１図において１はアルミ合金板、２はNi−
Ｐ下地層、３は中間下地層、４は強磁性めつき
膜、５は保護膜である。 In Figure 1, 1 is an aluminum alloy plate, 2 is a Ni-
3 is a P underlayer, 3 is an intermediate underlayer, 4 is a ferromagnetic plating film, and 5 is a protective film.
このうちで中間下地層３はNi−Ｐ下地層２表
面の加工変質層の影響を除去し、均一電着性を改
善し、また磁気特性の調整を行なうことを目的と
し、この中間下地層材料にはNi−Ｐ下地層２と
同じ材質であるNi−ＰやAu及びCu等がある。 Among these, the intermediate underlayer 3 is intended to remove the influence of the processed deteriorated layer on the surface of the Ni-P underlayer 2, improve uniform electrodeposition, and adjust the magnetic properties. includes Ni-P, Au, Cu, etc., which are the same materials as the Ni-P underlayer 2.
第２図はHcの強磁性めつき膜厚に対する依存
性を示したグラフであり、第２図中●は中間下地
層がNi−Ｐの場合の記録媒体、〇はAuの場合の
記録媒体、△はCuの場合の記録媒体、のそれぞ
れのHcの強磁性めつき膜厚依存性である。 Figure 2 is a graph showing the dependence of Hc on the ferromagnetic plating film thickness. Δ is the dependence of Hc on the ferromagnetic plating film thickness of each recording medium in the case of Cu.
第３図は媒体雑音電圧の周波数依存性を示し、
第３ａ図は中間下地層３がNi−Ｐの場合の記録
媒体、第３ｂ図は中間下地層３がAuまたはCuの
場合の記録媒体の媒体雑音電圧の周波数依存性を
示している。また第３図においてＡは信号スペク
トルを示す。 Figure 3 shows the frequency dependence of the medium noise voltage,
FIG. 3a shows the frequency dependence of the medium noise voltage of a recording medium in which the intermediate underlayer 3 is made of Ni--P, and FIG. 3b shows the frequency dependence of the medium noise voltage of a recording medium in which the intermediate underlayer 3 is made of Au or Cu. Further, in FIG. 3, A indicates a signal spectrum.
この第２図によればNi−Ｐを中間下地層３と
する記録媒体はAuやCuを中間下地層３とする記
録媒体に比べ、実用的強磁性めつき膜厚の領域
（0.03〜0.1μｍ）で、Hcは200〜400Oeも高く、
したがつて、高記録密度が期待できることがわか
る。 According to FIG. 2, the recording medium with Ni-P as the intermediate underlayer 3 has a practical ferromagnetic plating thickness (0.03 to 0.1 μm) compared to the recording medium with Au or Cu as the intermediate underlayer 3. ), Hc is as high as 200 to 400 Oe,
Therefore, it can be seen that high recording density can be expected.
一方、第３図に示す媒体雑音をみると、中間下
地層３がAuまたはCuの記録媒体方がNi−Ｐの記
録媒体に比べて媒体雑音が少なく、SNRが向上
している。 On the other hand, looking at the medium noise shown in FIG. 3, the recording medium in which the intermediate underlayer 3 is Au or Cu has less medium noise and the SNR is improved compared to the recording medium in which the intermediate underlayer 3 is Ni--P.
これら第２図、第３図より中間下地層３にNi
−Ｐを用いるとHcが高いので高記録密度が期待
されたけれども、媒体雑音が大きいためにそれに
よつて記録密度が制限され記録密度を向上できな
いという欠点があつた。また、中間下地層３に
Auを用いると低媒体雑音化が図れるけれども、
HcがCuを用いた場合より高いがNi−Ｐを用いた
場合より低いため500〜600BPM程度の記録密度
しか実現できないという欠点があつた。 From these figures 2 and 3, Ni is added to the intermediate base layer 3.
-P was expected to provide a high recording density due to its high Hc, but it had the disadvantage that the recording density was limited due to the large medium noise, making it impossible to improve the recording density. In addition, in the intermediate base layer 3
Although using Au can reduce medium noise,
Since Hc is higher than when using Cu but lower than when using Ni-P, there is a drawback that a recording density of only about 500 to 600 BPM can be achieved.
本発明はこのような欠点を除去せんとするもの
であり、詳しくは、Ni−ＰおよびAuの中間下地
層のそれぞれの長所を生かし、高記録密度でかつ
媒体雑音の少ない記録媒体を提供せんとするもの
である。 The present invention aims to eliminate these drawbacks, and more specifically, aims to provide a recording medium with high recording density and low media noise by taking advantage of the respective advantages of the Ni-P and Au intermediate underlayers. It is something to do.
したがつて、本発明による記録媒体は、Al系
板上にNi−Ｐからなる下地層を積層し、この下
地層上にAuからなる第１の中間下地層を積層
し、この第１の中間下地層上にNi−Ｐからなる
第２の中間下地層を積層するとともに、さらにこ
の第２の中間下地層上に強磁性めつき膜を重ね、
この強磁性めつき膜上に保護膜を形成したことを
特徴とするものである。 Therefore, in the recording medium according to the present invention, a base layer made of Ni-P is laminated on an Al-based plate, a first intermediate base layer made of Au is laminated on this base layer, and a first intermediate base layer made of Au is laminated on the base layer. Laminating a second intermediate underlayer made of Ni-P on the underlayer, and further overlaying a ferromagnetic plating film on this second intermediate underlayer,
It is characterized in that a protective film is formed on this ferromagnetic plating film.
本発明を実施例に基づいて更に詳しく説明す
る。 The present invention will be explained in more detail based on examples.
第４図は本発明の一実施例の構成図であり、符
号は第１図と同様、１はアルミ合金板、２はNi
−Ｐ下地層、３は中間下地層（ただし、３ａは
Auの中間下地層、３ｂはNi−Ｐの中間下地層）、
４は強磁性めつき膜、５は保護膜である。 FIG. 4 is a block diagram of an embodiment of the present invention, where the reference numerals are the same as in FIG. 1, 1 is an aluminum alloy plate, 2 is a Ni
-P base layer, 3 is intermediate base layer (however, 3a is
Au intermediate base layer, 3b is Ni-P intermediate base layer),
4 is a ferromagnetic plating film, and 5 is a protective film.
第４図より明かなように、アルミ合金板１上に
通常60μｍ以下のNi−Ｐ下地層２が積層されて
いる。 As is clear from FIG. 4, a Ni--P underlayer 2 with a thickness of usually 60 μm or less is laminated on the aluminum alloy plate 1.
さらにこのNi−Ｐ下地層２にAuの中間下地層
（以下、第１の中間下地層と言う）３ａ、および
Ni−Ｐの中間下地層（以下、第２の中間下地層
と言う）３ｂが順次積層されている。この第２の
中間下地層３ｂ上に電気めつきあるいは化学めつ
きによつて形成された強磁性めつき膜４および保
護膜５がそれぞれ設けられている。 Further, on this Ni-P base layer 2, an Au intermediate base layer (hereinafter referred to as the first intermediate base layer) 3a, and
Ni--P intermediate underlayers (hereinafter referred to as second intermediate underlayers) 3b are sequentially laminated. A ferromagnetic plating film 4 and a protective film 5 formed by electroplating or chemical plating are provided on the second intermediate underlayer 3b, respectively.
このような構成の本発明による記録媒体の再生
出力の記録密度依存性を第５図に示した。第５図
において、は中間下記層がAu単独の場合の記
録媒体、は中間下地層がNi−Ｐ単独の場合の
記録媒体、はAuとNi−Ｐを積層した場合、即
ち本発明による記録媒体のそれぞれの再生出力の
記録密度依存性である（中間下地層は基板より第
１、第２中間下地層の順で積層してある）。 FIG. 5 shows the dependence of the reproduction output of the recording medium according to the present invention having such a configuration on the recording density. In FIG. 5, indicates a recording medium in which the intermediate layer is made of Au alone, indicates a recording medium in which the intermediate underlayer is made of Ni-P alone, and indicates a recording medium in which Au and Ni-P are laminated, that is, a recording medium according to the present invention. (The intermediate underlayers are stacked in the order of the first and second intermediate underlayers from the substrate.)
この第５図より明らかなように、本発明による
記録媒体はNi−Ｐ単独の場合の記録媒体より記
録密度が若干低下しているが、それでも800BPM
以上の優れた高記録密度を有していた。ちなみに
Au単独の中間下地層の記録媒体では560BPM程度
の記録密度であつた。 As is clear from FIG. 5, the recording density of the recording medium according to the present invention is slightly lower than that of the recording medium using only Ni-P, but it still has a recording density of 800 BPM.
It had an excellent high recording density. By the way
A recording medium with an intermediate underlayer made of Au alone had a recording density of about 560 BPM.
第６図は信号対雑音比（SNR）の記録密度依
存性を示すグラフであり、第５図同様、は中間
下地層がAu単独の場合の記録媒体、は中間下
地層がNi−Ｐ単独の場合の記録媒体、は前記
の本発明による記録媒体、のそれぞれのSNRの
記録密度依存性である。 Figure 6 is a graph showing the dependence of the signal-to-noise ratio (SNR) on recording density. Similarly to Figure 5, 1 is a recording medium in which the intermediate underlayer is made of Au alone, and 1 is a graph in which the intermediate underlayer is made of only Ni-P. In this case, the recording medium is the recording density dependence of the SNR of each of the recording media according to the present invention.
この第６図より明かなように、Ni−Ｐ単独の
中間下地層を有する記録媒体の場合、記録密度の
増加と共に、SNRが急激に低下し、高記録密度
は期待しえない。これに対し、本発明による記録
媒体は、Au単独の中間下地層を有する記録媒体
に比べ1dB程度のSNR低下でしかなく、高記録密
度時でも高いSNRを得た。したがつて、本発明
の記録媒体は800BPM以上の高記録密度を実用的
に達成しえる。 As is clear from FIG. 6, in the case of a recording medium having an intermediate underlayer made of Ni--P alone, as the recording density increases, the SNR rapidly decreases, and high recording density cannot be expected. In contrast, the recording medium according to the present invention had an SNR drop of only about 1 dB compared to a recording medium having an intermediate underlayer made of only Au, and obtained a high SNR even at high recording density. Therefore, the recording medium of the present invention can practically achieve a high recording density of 800 BPM or more.
以上のように、本発明による記録媒体によれ
ば、Ni−Ｐの上にAu、さらにその上にNi−Ｐを
形成した下地を用いたため、Ni−ＰおよびAuの
両者の下地としての長所のみを有し、800BPM以
上の高記録密度時でも、高い再生出力と良好な
SNRの両方が得られると言う利点を有する。 As described above, according to the recording medium of the present invention, since the base layer is formed by forming Au on top of Ni-P and further forming Ni-P on top of that, only the advantages of both Ni-P and Au as bases are used. It has high playback output and good performance even at high recording densities of 800 BPM or more.
It has the advantage that both SNR and SNR can be obtained.
第１図は従来のめつき媒体の構成図、第２図は
従来の記録媒体の保磁力Hcの強磁性めつき膜厚
依存性、第３図ａ，ｂは媒体雑音電圧の周波数依
存性、第４図は本発明の一実施例の構成図、第５
図は再生出力の記録密度依存性、第６図はSNR
の記録密度依存性を示す図である。
１……アルミ合金板、２……Ni−Ｐ下地層、
３……中間下地層、３ａ……第１の中間下地層、
３ｂ……第２の中間下地層、４……強磁性めつき
膜、５……保護膜。
Figure 1 is a configuration diagram of a conventional plated medium, Figure 2 is the dependence of the coercive force Hc of the conventional recording medium on the ferromagnetic plating film thickness, Figures 3a and b are the frequency dependence of the medium noise voltage, FIG. 4 is a configuration diagram of an embodiment of the present invention, and FIG.
The figure shows the recording density dependence of the playback output, and the figure 6 shows the SNR.
FIG. 3 is a diagram showing the recording density dependence of . 1... Aluminum alloy plate, 2... Ni-P base layer,
3... intermediate base layer, 3a... first intermediate base layer,
3b...second intermediate underlayer, 4...ferromagnetic plating film, 5...protective film.
Claims (1)
し、この下地層上にAuからなる第１の中間下地
層を積層し、この第１の中間下地層上にNi−Ｐ
からなる第２の中間下地層を積層するとともに、
さらにこの第２の中間下地層上に強磁性めつき膜
を重ね、さらに強磁性めつき膜上に保護膜を形成
したことを特徴とする記録媒体。1 A base layer made of Ni-P is laminated on an Al-based plate, a first intermediate base layer made of Au is laminated on this base layer, and a Ni-P base layer is laminated on this first intermediate base layer.
While laminating a second intermediate base layer consisting of,
A recording medium further comprising a ferromagnetic plating film overlaid on the second intermediate underlayer, and a protective film further formed on the ferromagnetic plating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6150679A JPS55157130A (en) | 1979-05-21 | 1979-05-21 | Recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6150679A JPS55157130A (en) | 1979-05-21 | 1979-05-21 | Recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55157130A JPS55157130A (en) | 1980-12-06 |
| JPS627605B2 true JPS627605B2 (en) | 1987-02-18 |
Family
ID=13173039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6150679A Granted JPS55157130A (en) | 1979-05-21 | 1979-05-21 | Recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55157130A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615419A (en) * | 1984-06-19 | 1986-01-11 | Tokico Ltd | Magnetic disk |
| JPH08221734A (en) * | 1995-02-20 | 1996-08-30 | Fujitsu Ltd | Magnetic recording medium and magnetic recorder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1344770A (en) * | 1971-06-03 | 1974-01-23 | Control Data Corp | Magnetic recording medium |
| JPS5122405A (en) * | 1974-08-19 | 1976-02-23 | Fuji Photo Film Co Ltd | JIKIDEISUKU |
| JPS5162007A (en) * | 1974-11-27 | 1976-05-29 | Suwa Seikosha Kk | JIKIKIRO KUTAI |
-
1979
- 1979-05-21 JP JP6150679A patent/JPS55157130A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1344770A (en) * | 1971-06-03 | 1974-01-23 | Control Data Corp | Magnetic recording medium |
| JPS5122405A (en) * | 1974-08-19 | 1976-02-23 | Fuji Photo Film Co Ltd | JIKIDEISUKU |
| JPS5162007A (en) * | 1974-11-27 | 1976-05-29 | Suwa Seikosha Kk | JIKIKIRO KUTAI |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55157130A (en) | 1980-12-06 |
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