JPS60111320A - Thin metallic film type magnetic recording medium - Google Patents
Thin metallic film type magnetic recording mediumInfo
- Publication number
- JPS60111320A JPS60111320A JP21810583A JP21810583A JPS60111320A JP S60111320 A JPS60111320 A JP S60111320A JP 21810583 A JP21810583 A JP 21810583A JP 21810583 A JP21810583 A JP 21810583A JP S60111320 A JPS60111320 A JP S60111320A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- young
- modulus
- base plate
- thin film
- 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
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は高密度磁気記録再生に利用される金属薄膜型磁
気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a metal thin film magnetic recording medium used for high-density magnetic recording and reproduction.
従来例の構成とその問題点
ビデオ記録、コンピュータデータ記録などに用いる磁気
記録媒体においては記録容量の大容量化。Conventional configurations and their problems Magnetic recording media used for video recording, computer data recording, etc. have increased recording capacity.
機器の小型化を達成するため記録密度の向上が強く望ま
れていることは良く知られている。It is well known that there is a strong desire to improve recording density in order to achieve downsizing of devices.
そのため各方面で磁気記録媒体の改良が続けられている
が、磁気記録再生は媒体と磁気ヘッドの相互作用に基本
があり、原理的に高密度記録に適した媒体であるのは勿
論であるが、実用信頼性の確保できるものでなければな
らない〇
」上記事情に鑑み、現在提案されているC o −N
i −○系の面内磁化膜、Co−Cr系の垂直磁化膜に
代表される強磁性金属薄膜を磁気記録層とする金属薄膜
型磁気記録媒体は、最短記録波長が0.5μmに捷で短
波長化可能であることが確かめられ、有望視されている
ものの、くり返し使用時、強磁性金属薄膜に亀裂が入り
、信号対雑音比(以下S/Nで示す)が増加する欠点が
あり、磁気記録層表面に滑剤を塗布し、滑性を付l与す
ることで、応力分散により、亀裂の発生を抑える試みが
あるが不十分であるし、強磁性金属薄膜と高分子基板と
の間の付着強度が重要な因子となっているとの考え方に
基ずく高分子基板の前処理等も検討されているもののこ
れも不十分であり、例えば回転ヘリカルスキャンの磁気
ヘッドによる記録再生では、テープ走行系を工夫し、テ
ープに与える張力の大きさ。For this reason, magnetic recording media continue to be improved in various fields, but magnetic recording and reproduction is based on the interaction between the medium and the magnetic head, and it goes without saying that in principle it is a medium suitable for high-density recording. In view of the above circumstances, the currently proposed Co-N
A metal thin film type magnetic recording medium whose magnetic recording layer is a ferromagnetic metal thin film such as an i-○ based in-plane magnetized film or a Co-Cr based perpendicularly magnetized film has a shortest recording wavelength of 0.5 μm. Although it has been confirmed that it is possible to shorten the wavelength, and it is viewed as promising, it has the disadvantage that the ferromagnetic metal thin film cracks when used repeatedly, increasing the signal-to-noise ratio (hereinafter referred to as S/N). Attempts have been made to apply a lubricant to the surface of the magnetic recording layer to impart lubricity, thereby dispersing stress and suppressing the occurrence of cracks. Pretreatment of polymer substrates based on the idea that the adhesion strength is an important factor has been considered, but this is also insufficient.For example, when recording and reproducing using a rotating helical scan magnetic head, The running system has been devised to increase the amount of tension applied to the tape.
変動を小さくしても、100回反」二の走行でS/Nを
維持できる構成のものは見出せないのが実状である。The reality is that even if the fluctuation is reduced, it is impossible to find a structure that can maintain the S/N ratio even after 100 cycles.
発明の目的
本発明は強磁性金属薄膜を磁気記録層とし、くり返し使
用でS/Nの安定な金属薄膜型磁気記録媒体を提供する
ことを目的とする。OBJECTS OF THE INVENTION An object of the present invention is to provide a metal thin film type magnetic recording medium that uses a ferromagnetic metal thin film as a magnetic recording layer and has a stable S/N ratio even after repeated use.
発明の構成
本発明の金属薄膜型磁気記録媒体は高分子基板上に強磁
性金属薄膜から成る磁気記録層を配し、前記強磁性金属
薄膜のヤング率が前記高分子基板のヤング率と同等であ
ることを特徴とするものでくり返し記録再生を行っても
亀裂は発生しないが発生しても殆んどS/Nの低下なし
に使用できる媒体が得られるものである。Structure of the Invention The metal thin film magnetic recording medium of the present invention has a magnetic recording layer made of a ferromagnetic metal thin film on a polymer substrate, and the Young's modulus of the ferromagnetic metal thin film is equal to the Young's modulus of the polymer substrate. It is characterized in that even if repeated recording and reproduction are performed, cracks do not occur, but even if cracks occur, a medium that can be used with almost no decrease in S/N can be obtained.
実施例の説明
以下本発明について図面を参照しながら説明する。第1
図は本発明の金属薄膜型磁気記録媒体の拡大断面図で、
第1図に於て1は強磁性金属薄膜からなる磁気記録層で
、2は高分子基板で、3は滑剤塗布層である。ここで強
磁性金属薄膜1としては、Co 、 Fe 、Ni 、
Co−Fe 、Co−Ni 、Co −B 。DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to the drawings. 1st
The figure is an enlarged cross-sectional view of the metal thin film magnetic recording medium of the present invention.
In FIG. 1, 1 is a magnetic recording layer made of a ferromagnetic metal thin film, 2 is a polymer substrate, and 3 is a lubricant coating layer. Here, the ferromagnetic metal thin film 1 includes Co, Fe, Ni,
Co-Fe, Co-Ni, Co-B.
Co−Cu 、 Co −G e 、 Co−Mn 、
Co −Mg 、 Co −Mo 。Co-Cu, Co-Ge, Co-Mn,
Co-Mg, Co-Mo.
Co−Pt 、Co−Ru 、Co−Rh 、Co −
3i 、Co −8m 。Co-Pt, Co-Ru, Co-Rh, Co-
3i, Co-8m.
Co−Gd 、Co−Ta 、Co −V 、Co−W
、Co −Y 、Co−Zn。Co-Gd, Co-Ta, Co-V, Co-W
, Co-Y, Co-Zn.
Co−Cr 、Co−Ti 、Co−Ce 、Co−N
i−Cr 、Co −Ni −Mg 、Co−Ni−I
n 、Co−Cr−8n等及びそれらの部分酸化膜2部
分窒化膜などが挙げられる。Co-Cr, Co-Ti, Co-Ce, Co-N
i-Cr, Co-Ni-Mg, Co-Ni-I
n, Co-Cr-8n, etc., and partial oxide films and two-part nitride films thereof.
前記薄膜の製法としては、無電解メッキ、イオンビーム
デポジション、イオンブレーティング。Methods for producing the thin film include electroless plating, ion beam deposition, and ion blating.
スパッタリング、電子ビーム蒸着等公知の薄膜化技術か
ら適宜選択できる。薄膜のヤング率の調整は例えば材t
1として、バルク−でヤング率の低い金属であるIn、
Sn、Znなどをパ加するが、基板の温度を変えること
によりできる。It can be appropriately selected from known thin film forming techniques such as sputtering and electron beam evaporation. The Young's modulus of the thin film can be adjusted, for example, by adjusting the material t.
1, In, which is a metal with a low Young's modulus in bulk,
Addition of Sn, Zn, etc. can be done by changing the temperature of the substrate.
高分子基板2としてに1、ポリエチレンテレフタレート
等のポリエステル類、ポリプロピレン等ノホリオレフィ
ン類、セルロースジアセテート、ニトロセルロース等の
セルロース誘導体、ポリカーボネート、ポリ塩化ビニル
、ポリアミ1包ポリイミド等が挙げられ、下塗り層を有
する場合或いは背面塗布層を有する場合は、それを含め
て高分子基板2とみなして考えるものとする。滑剤塗布
層3は、脂肪酸、金属石けん、脂肪酸アミド、鉱油。Examples of the polymer substrate 2 include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose diacetate and nitrocellulose, polycarbonate, polyvinyl chloride, polyamide 1-pack polyimide, etc., and an undercoat layer. or a back coating layer, it shall be considered as the polymer substrate 2 including it. The lubricant coating layer 3 contains fatty acids, metal soap, fatty acid amide, and mineral oil.
動植物油、高級アルコール、シリコーンオイル。Animal and vegetable oils, higher alcohols, silicone oils.
フルオロカーボン類などを溶剤に溶かして塗布乾燥して
得るか、乾式法にて得たものである。It is obtained by dissolving fluorocarbons etc. in a solvent and applying and drying it, or by a dry method.
本発明では前記構成材料を用いた高分子基板と強磁性金
属薄膜のヤング率を同等の値にすることでテープレコー
ダでのくり返し使用時に強磁性金属薄膜に亀裂が入り、
特に短波長でのS/N低下が起ることを防止するもので
、ヤング率をそれ程大きな値にし々くても充分で、例え
亀裂が入ってもg/Nの低下には殆んど影響し々いもの
である。In the present invention, by making the Young's modulus of the polymer substrate using the above-mentioned constituent materials and the ferromagnetic metal thin film the same value, cracks will occur in the ferromagnetic metal thin film during repeated use in a tape recorder.
It prevents the S/N reduction from occurring especially at short wavelengths, and it is sufficient even if the Young's modulus is set to such a large value, and even if cracks occur, there is almost no effect on the reduction in g/N. It's a quiet thing.
本発明で同等という意味は、両者のヤング率の差が50
Kg /maの範囲を含んでいる。In the present invention, equivalent means that the difference in Young's modulus between the two is 50
Kg/ma range.
その限りに於て、恐らく高分子基板と強磁性金属薄膜の
界面に大きな歪が生じないために、全体のヤング率がそ
れ程大きくなくても前記した作用効果が生れるものと思
われる。To that extent, it is thought that the above effects are produced even if the overall Young's modulus is not so large, probably because no large strain occurs at the interface between the polymer substrate and the ferromagnetic metal thin film.
更に本発明の具体的々実施例について詳述する。Further, specific examples of the present invention will be described in detail.
〔実施例−1〕
ヤング率550 Kg /mn+ 、厚み10.571
mのポリエチレンテレフタレートフィルム上ニ斜メ蒸着
ニよりヤング率の異々る強磁性金属薄膜0.131+m
を形成し、その上にミ+)スチン酸30099m溶解し
たメチルイソブチルケトンを乾燥後の厚みが約60人に
なるよう塗布乾燥し、8て幅の磁気テープを作成し、0
.3μmのギャップ長をもったフェライトヘッドを搭載
した直径40陥の回転シリンダを用いた回転ヘリカルス
キャン方式でトラック幅12μmでテープヘッド相対速
度3.s5m/secで5 MHzの信号の記録再生を
くり返しS/Nの変化をそれぞれのテープの第1回目の
再生値をOf:dB)として比較した。[Example-1] Young's modulus 550 Kg/mn+, thickness 10.571
ferromagnetic metal thin films with different Young's modulus from diagonal vapor deposition on polyethylene terephthalate film of 0.131+m
30099m of mi+)stinic acid dissolved in methyl isobutyl ketone was applied on top of it so that the thickness after drying was approximately 60 mm, and a magnetic tape with a width of 8 mm was made.
.. Using a rotating helical scan method using a rotating cylinder with a diameter of 40 and equipped with a ferrite head with a gap length of 3 μm, the track width is 12 μm and the relative speed of the tape head is 3.5 μm. Recording and reproduction of a 5 MHz signal was repeated at a rate of 5 m/sec, and the change in S/N was compared using the first reproduction value of each tape as Of: dB).
但し測定環境は33℃85%RH一定とした。However, the measurement environment was kept constant at 33° C. and 85% RH.
強磁性金属薄膜を形成する時の真空度は8X10 ’T
orrの酸素分圧と他の残りのガス分圧が1.3 X
10 Torr の構成に保持した。The degree of vacuum when forming the ferromagnetic metal thin film is 8X10'T.
orr oxygen partial pressure and other remaining gas partial pressures are 1.3
The configuration was maintained at 10 Torr.
強磁性金属薄膜の条件とS/N の測定結果とテスト後
300倍の光学顕微鏡で表面がん察した結果を表に示し
た。The table shows the conditions for the ferromagnetic metal thin film, the S/N measurement results, and the results of surface cancer detection using an optical microscope at 300x magnification after the test.
表より明らかなように、テープ4を除いて、400パス
目の再生レベルも変化ないし2表面がん察結果からもS
/Nに影iする亀裂は皆無であることがわかる。As is clear from the table, except for tape 4, the playback level at the 400th pass also changed, and from the results of surface cancer detection on tape 2, S
It can be seen that there are no cracks that affect /N.
〔実施例−2〕
厚み9μmのポリエチレンテレフタレートでヤング率4
osK9/−、610Kg/ml(/J)2種類ノ基板
を用い、Co−Cr−8nからなるターゲットを成分比
を変えて準備し、高周波スパックリング法により垂直磁
化膜0.18μmを形成した。その上にミリスチン酸の
塗布層形成、スリットは実施例−1と同様に実施し、実
施例−1と同一の評価を行った結果を第2図に示した。[Example-2] Young's modulus of 9 μm thick polyethylene terephthalate is 4
Using two types of substrates, osK9/- and 610 Kg/ml (/J), targets made of Co--Cr-8n were prepared with different component ratios, and a perpendicularly magnetized film of 0.18 .mu.m was formed by a high-frequency sputtering method. Formation of a coating layer of myristic acid thereon and slitting were carried out in the same manner as in Example-1, and the same evaluation as in Example-1 was performed. The results are shown in FIG.
第2図は400パス目のS/Nを示したもので、S、7
Nが−2(dB)より悪くなったテープは全て強い亀裂
が発生していだが本発明品には亀裂はなかった。Figure 2 shows the S/N of the 400th pass.
All tapes with N worse than -2 (dB) had strong cracks, but the products of the present invention had no cracks.
発明の効果
本発明は高分子基板のヤング率と同等のヤング率の強磁
性金属薄膜を磁気記録層として配することで、テープレ
コーダでのくり返し使用で発生する亀裂によるS/N低
下のない磁気記録媒体でその実用価値は大きい。Effects of the Invention By disposing a ferromagnetic metal thin film with a Young's modulus equivalent to that of a polymer substrate as a magnetic recording layer, the present invention provides a magnetic recording layer that does not suffer from S/N deterioration due to cracks that occur during repeated use in a tape recorder. Its practical value as a recording medium is great.
第1図は本発明の磁気記録媒体の断面図、第2図は、本
発明の磁気記録媒体の構成要件と特性との関係を示す図
である。
1・・・・・強磁性金属薄膜、2・・・・・高分子基板
。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名実
11″!′I
第2図
ヤングf CKvmm”:JFIG. 1 is a sectional view of the magnetic recording medium of the present invention, and FIG. 2 is a diagram showing the relationship between constituent elements and characteristics of the magnetic recording medium of the present invention. 1...Ferromagnetic metal thin film, 2...Polymer substrate. Name of agent: Patent attorney Toshio Nakao and one other person
11″!’I Fig. 2 Young f CKvmm”:J
Claims (1)
してなり、前記強磁性金属薄膜のヤング率が前記高分子
基板のヤング率と同等であることを特徴とする金属薄膜
型磁気記録媒体。Metal thin film magnetic recording comprising a magnetic recording layer made of a ferromagnetic metal thin film arranged on a polymer substrate, wherein the Young's modulus of the ferromagnetic metal thin film is equivalent to the Young's modulus of the polymer substrate. Medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21810583A JPS60111320A (en) | 1983-11-18 | 1983-11-18 | Thin metallic film type magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21810583A JPS60111320A (en) | 1983-11-18 | 1983-11-18 | Thin metallic film type magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60111320A true JPS60111320A (en) | 1985-06-17 |
Family
ID=16714708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21810583A Pending JPS60111320A (en) | 1983-11-18 | 1983-11-18 | Thin metallic film type magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60111320A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100636826B1 (en) | 2005-10-24 | 2006-10-20 | 한국과학기술연구원 | Noise-suppression flexible films, electromagnetic shielded circuit boards and including the same |
-
1983
- 1983-11-18 JP JP21810583A patent/JPS60111320A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100636826B1 (en) | 2005-10-24 | 2006-10-20 | 한국과학기술연구원 | Noise-suppression flexible films, electromagnetic shielded circuit boards and including the same |
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