JPH0475573B2 - - Google Patents
Info
- Publication number
- JPH0475573B2 JPH0475573B2 JP58218931A JP21893183A JPH0475573B2 JP H0475573 B2 JPH0475573 B2 JP H0475573B2 JP 58218931 A JP58218931 A JP 58218931A JP 21893183 A JP21893183 A JP 21893183A JP H0475573 B2 JPH0475573 B2 JP H0475573B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- thin film
- metal thin
- thickness direction
- 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.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 24
- 239000010409 thin film Substances 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 230000005294 ferromagnetic effect Effects 0.000 claims description 11
- 229920000307 polymer substrate Polymers 0.000 claims description 10
- 239000010408 film Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229910020598 Co Fe Inorganic materials 0.000 description 1
- 229910020634 Co Mg Inorganic materials 0.000 description 1
- 229910020632 Co Mn Inorganic materials 0.000 description 1
- 229910020637 Co-Cu Inorganic materials 0.000 description 1
- 229910002519 Co-Fe Inorganic materials 0.000 description 1
- 229910020678 Co—Mn Inorganic materials 0.000 description 1
- 229910020707 Co—Pt Inorganic materials 0.000 description 1
- 229910020705 Co—Rh Inorganic materials 0.000 description 1
- 229910020711 Co—Si Inorganic materials 0.000 description 1
- 229910020710 Co—Sm Inorganic materials 0.000 description 1
- 229910020517 Co—Ti Inorganic materials 0.000 description 1
- 229910020516 Co—V Inorganic materials 0.000 description 1
- 229910020515 Co—W Inorganic materials 0.000 description 1
- 229910020514 Co—Y Inorganic materials 0.000 description 1
- 229910020521 Co—Zn Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910018505 Ni—Mg Inorganic materials 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000007737 ion beam deposition Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- FPVKHBSQESCIEP-JQCXWYLXSA-N pentostatin Chemical compound C1[C@H](O)[C@@H](CO)O[C@H]1N1C(N=CNC[C@H]2O)=C2N=C1 FPVKHBSQESCIEP-JQCXWYLXSA-N 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Magnetic Record Carriers (AREA)
Description
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。
従来例の構成とその問題点
ビデオ記録、コンピユ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、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。
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ツドの
相互作用に基本があり、原理的に高密度記録に適
した媒体であるものは勿論であるが、実用信頼性
の確保できるものでなければならない。
上記事情に鑑み、現在提案されているCo−Ni
−Ｏ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
までに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、信号対雑音化（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つているとの考え
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
カルスキヤンの磁気ヘツ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、変動を小さくしても、100回以上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。
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。
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
の厚み方向に対する圧縮弾性率が400Kg／mm2以上
であることを特徴とするもので、くり返し記録再
生を行つても亀裂は発生しないか発生しても殆ん
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。
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，Co−Cu，Co−Ge，Co−Mn，Co−Mg，Co
−Mo，Co−Pt，Co−Ru，Co−Rh，Co−Si，
Co−Sm，Co−Gd，Co−Ta，Co−Ｖ，Co−Ｗ，
Co−Ｙ，Co−Zn，Co−Cr，Co−Ti，Co−Ce，
Co−Ni−Cr，Co−Ni−Mg等及びそれらの部分
酸化膜、部分窒化膜などが挙げられる。
前記薄膜の製法としては、無電解メツキ、イオ
ンビームデポジシヨン、イオンプレーテイング、
スパツタリング、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。
高分子基板２としては、ポリエチレンテレフタ
レート等のポリエステル類、ポリプロピレン等の
ポリオレフイン類、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、ポリアミド、ポリイ
ミド等が挙げられ、下塗り層を有する場合は、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、動植物油、高級アルコール、
シリコーンオイル、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。
本発明の要旨とするところは、前記基板の構成
要件が従来全く着目されなかつた基板の厚み方向
の機械特性に制限を加えるもので、具体的には、
厚み方向の圧縮弾性率を400Kg／mm2以上にするこ
とで後述するように、走行系での異常な応力集中
でも亀裂が発生しないか、例え発生してもＳ／Ｎ
が低下する程の永久変形にならないものである。
臨界値が400Kg／mm2にあることについては、必
ずしも明確ではないが、前提となるのは、短波長
記録のために、磁気記録層表面は、平均粗さで
0.05μｍ以下で好んで使われるため、テープの走
行系に特別の配慮がされ、シリンダ、ポスト、ピ
ンチローラ、ガイドピン等の表面仕上げも1S以
下で用いられることから、これらの組み合せで総
合的に決るもので、定常走行時のテープ張力は
高々40ｇ（テープ幅８mmに対して）までの範囲で
使用することと基板厚みは20μｍ以下で使われる
ことが前提である。
尚数多くの実験結果が示しているのは、400
Kg／mm2から300Kg／mm2の範囲では、強磁性金属薄
膜の条件によつてＳ／Ｎの劣化するものとしない
ものとが現れる遷移領域となるので、400Kg／mm2
以下を使用するのが好ましい。
尚基板の条件で厚み方向に400Kg／mm2以上の圧
縮弾性率を有するものを選択するには、材質を選
ぶか、同一材質でも製膜時の特に熱管理条件を選
ぶことで実施できるものである。
〔実施例 １〕
厚み15μｍのポリエーテルケトンスルフオンフ
イルムを厚み方向の圧縮弾性率を３水準選んで、
その基板上にCo−Ni（Ni20重量％）０，12μｍを
１×10-6Torrの酸素雰囲気で0.2μｍ／minの速度
で最小入射角43度で蒸着した。この上にミリスチ
ン酸を180ppm溶解したメチルエチルケトンを乾
燥厚みが55Åになるよう塗布し、８mm幅の磁気テ
ープを得た。
このテープをギヤツプ長0.25μｍのアモルフア
スヘツドを塔さいした直径40mmの回転シリンダに
沿わせて移動する走行系をもつた試験用のビデオ
テープレコーダにかけて（張力25ｇとした）くり
返し使用してＳ／Ｎの変化を調べた。Ｓ／Ｎは記
録波長0.66μｍの値で第１回目の記録再生時の値
をＯ〔dB〕とした。その結果を表１に示した。
INDUSTRIAL APPLICATION FIELD The present invention relates to a metal thin film magnetic recording medium used for high-density magnetic recording and reproduction. Conventional configurations and their problems It is well known that there is a strong desire to improve the recording density of magnetic recording media used for video recording, computer data recording, etc. in order to achieve larger recording capacity and smaller equipment. Are known. 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 the medium is suitable in principle for high-density recording. , it must be possible to ensure practical reliability. In view of the above circumstances, Co-Ni is currently being proposed.
A metal thin film magnetic recording medium whose magnetic recording layer is a ferromagnetic metal thin film, typically a -O-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 seen as promising, the ferromagnetic metal thin film cracks when used repeatedly, resulting in signal-to-noise (hereinafter referred to as S/
However, attempts have been made to suppress the occurrence of cracks by coating the surface of the magnetic recording layer with a lubricant to impart lubricity and dispersion of stress, but this is insufficient, and ferromagnetic Although pretreatment of polymer substrates based on the idea that the adhesion strength between the metal thin film and the polymer substrate is an important factor has been considered, these are also insufficient. In recording and reproducing using scan magnetic heads,
Even if the tape running system is devised to reduce the magnitude and fluctuation of the tension applied to the tape, the reality is that no structure has been found that can maintain S/N over 100 cycles. 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. Structure of the Invention The metal thin film magnetic recording medium of the present invention is characterized in that the compressive modulus of elasticity in the thickness direction of the polymer substrate is 400 Kg/mm 2 or more, and cracks do not occur even after repeated recording and reproduction. Even if this occurs, a medium that can be used with almost no reduction in S/N can be obtained. DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is an enlarged 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. It is. Here, the ferromagnetic metal thin film 1 includes Co, Fe, Ni, Co-Fe, Co-Ni, Co-
B, Co-Cu, Co-Ge, Co-Mn, Co-Mg, Co
−Mo, Co−Pt, Co−Ru, Co−Rh, Co−Si,
Co-Sm, Co-Gd, Co-Ta, Co-V, Co-W,
Co-Y, Co-Zn, Co-Cr, Co-Ti, Co-Ce,
Examples include Co-Ni-Cr, Co-Ni-Mg, etc., and their partial oxide films and partial nitride films. The thin film manufacturing method includes electroless plating, ion beam deposition, ion plating,
It can be appropriately selected from known thin film forming techniques such as sputtering and electron beam evaporation. 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, polyimide, etc., and when it has an undercoat layer. shall be considered including the polymer substrate 2. The lubricant coating layer 3 contains fatty acids, metal soaps, fatty acid amides, mineral oils, animal and vegetable oils, higher alcohols,
It is obtained by dissolving silicone oil, fluorocarbons, etc. in a solvent and applying and drying it, or by a dry method. The gist of the present invention is to limit the mechanical properties of the substrate in the thickness direction, which have not received any attention in the past.
By setting the compressive modulus of elasticity in the thickness direction to 400 kg/mm2 or more , as will be explained later, even if abnormal stress concentration occurs in the running system, cracks will not occur, and even if they occur, the S/N will be low.
It does not cause permanent deformation to the extent that it decreases. It is not necessarily clear that the critical value is 400Kg/ mm2 , but the premise is that for short wavelength recording, the surface of the magnetic recording layer has an average roughness.
Since it is preferred to use 0.05 μm or less, special consideration is given to the tape running system, and the surface finish of cylinders, posts, pinch rollers, guide pins, etc. is also used at 1S or less, so the combination of these It is assumed that the tape tension during steady running is at most 40 g (for a tape width of 8 mm) and that the substrate thickness is 20 μm or less. Furthermore, numerous experimental results have shown that 400
In the range of Kg/mm 2 to 300Kg/mm 2 , there is a transition region where S/N may or may not deteriorate depending on the conditions of the ferromagnetic metal thin film, so 400Kg/mm 2
Preferably, the following are used: In addition, selecting a substrate with a compressive modulus of elasticity of 400 Kg/mm 2 or more in the thickness direction can be done by selecting the material or, even if the same material is used, by selecting the heat management conditions during film formation. be. [Example 1] A polyetherketone sulfonate film with a thickness of 15 μm was selected from three levels of compressive elastic modulus in the thickness direction.
Co--Ni (Ni 20% by weight) 0.12 .mu.m thick was deposited on the substrate in an oxygen atmosphere of 1.times.10.sup. -6 Torr at a rate of 0.2 .mu.m/min and at a minimum incident angle of 43 degrees. Methyl ethyl ketone containing 180 ppm of myristic acid dissolved therein was coated onto the tape to a dry thickness of 55 Å to obtain a magnetic tape with a width of 8 mm. This tape was passed through a test video tape recorder (tension was 25 g) and used repeatedly to move along a rotating cylinder with a diameter of 40 mm and an amorphous head with a gap length of 0.25 μm. We investigated changes in N. The S/N is a value at a recording wavelength of 0.66 μm, and the value at the first recording/reproducing time is O [dB]. The results are shown in Table 1.
【表】【table】
厚み9μｍのポリアミドイミドフイルムを基板
とし、厚み方向の圧縮弾性率の異なるものに、80
％NiのNi−Fe合金を0.3μｍ、20％CrのCo−Cr合
金を0.1μｍをAr分圧１×10-2Torr中で13.56MHz
のグロー放電を利用したスパツタリング法により
積層し、実施例−１と同様に垂直記録用の８mm幅
のテープを作成し、ギヤツプ長0.3μｍのフエライ
トヘツドによりＳ／Ｎの変化を調べた結果を表２
に示す。
A polyamide-imide film with a thickness of 9 μm was used as a substrate, and the compressive modulus of elasticity in the thickness direction was different.
0.3 μm of Ni-Fe alloy with %Ni and 0.1 μm of Co-Cr alloy with 20% Cr at 13.56MHz in Ar partial pressure of 1×10 -2 Torr.
A tape with a width of 8 mm for perpendicular recording was prepared in the same manner as in Example 1 by laminating the tapes by a sputtering method using glow discharge, and the changes in S/N were investigated using a ferrite head with a gap length of 0.3 μm. The results are shown below. 2
Shown below.
【表】
両実施例に共通して言えることは基板によらず
厚み方向の圧縮弾性率が400Kg／mm2以上であれば
環境によることなく、多数のくり返し使用後も
Ｓ／Ｎは殆んど変化ししない点で、これは第２図
に亀裂の入るメカニズムをを摸式的に示したよう
に、例えばポスト４の異常突起５（又はかみ込ん
だ、硬いゴミ、磁性粉などの場合も同様である。）
に起因した変形が基板の厚み方向に（矢印Ａで示
したように）伝幡し、強磁性金属薄膜を破かい
し、亀裂６を生じることが殆んどないか、あつて
も変形量が小さくＳ／Ｎに影響しないのである。
この亀裂に特徴的なのは、放射状の亀裂、又は放
射状と同心状に近い亀裂の混在で、この種の亀裂
が著しくノイズを誘発するために、これを防ぐ本
発明の構成はくり返し使用下にＳ／Ｎを安定化し
た磁気記録媒体を得る上で極めて有効である。
発明の効果
本発明は、高分子基板の厚み方向の圧縮弾性率
が400Kg／mm2以上の基板上に強磁性金属薄膜を配
することで、テープレコーダでくり返し使用した
時に亀裂が発生してＳ／Ｎを低下させることを実
用レベルで防止できるもので、短波長記録用の媒
体として実用価値は大きい。[Table] What is common to both examples is that regardless of the substrate, if the compressive modulus in the thickness direction is 400 Kg/mm 2 or more, the S/N will be almost constant even after repeated use regardless of the environment. As shown in Figure 2, which shows the mechanism by which cracks occur, this also applies to abnormal protrusions 5 on posts 4 (or in the case of hard dust, magnetic powder, etc. )
The deformation caused by this propagates in the thickness direction of the substrate (as shown by arrow A), rupturing the ferromagnetic metal thin film, and causing cracks 6. This is small and does not affect the S/N.
This type of crack is characterized by radial cracks or a mixture of radial and concentric cracks, and since this type of crack significantly induces noise, the structure of the present invention prevents this from occurring when the S/S is used repeatedly. This is extremely effective in obtaining a magnetic recording medium in which N is stabilized. Effects of the Invention The present invention provides a method of disposing a ferromagnetic metal thin film on a polymer substrate having a compressive modulus of elasticity in the thickness direction of 400 Kg/mm 2 or more. It is possible to prevent a decrease in /N at a practical level, and has great practical value as a medium for short wavelength recording.
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、第２図は本発明の磁気記録媒体の作用
効果を説明するための図である。
１……強磁性金属薄膜、２……高分子基板、６
…亀裂部。
FIG. 1 is an enlarged sectional view of the metal thin film magnetic recording medium of the present invention, and FIG. 2 is a diagram for explaining the effects of the magnetic recording medium of the present invention. 1...Ferromagnetic metal thin film, 2...Polymer substrate, 6
...Crack area.
Claims (1)
記録層を配して成る磁気記録媒体に於て、前記高
分子基板の厚み方向に対する圧縮弾性率が400
Kg／mm2以上であることを特徴とする金属薄膜型磁
気記録媒体。1. In a magnetic recording medium in which a magnetic recording layer made of a ferromagnetic metal thin film is disposed on a polymer substrate, the compressive elastic modulus of the polymer substrate in the thickness direction is 400.
A metal thin film type magnetic recording medium characterized by having a magnetic recording capacity of Kg/mm 2 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21893183A JPS60111322A (en) | 1983-11-21 | 1983-11-21 | Thin metallic film type magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21893183A JPS60111322A (en) | 1983-11-21 | 1983-11-21 | Thin metallic film type magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60111322A JPS60111322A (en) | 1985-06-17 |
| JPH0475573B2 true JPH0475573B2 (en) | 1992-12-01 |
Family
ID=16727562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21893183A Granted JPS60111322A (en) | 1983-11-21 | 1983-11-21 | Thin metallic film type magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60111322A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3526150B2 (en) * | 1995-10-31 | 2004-05-10 | 矢崎総業株式会社 | Plating treatment jig and plating treatment method using plating treatment jig |
| JPH09298382A (en) | 1996-05-07 | 1997-11-18 | Yazaki Corp | Shield plating corrugate tube |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5610455A (en) * | 1979-07-09 | 1981-02-02 | Toray Industries | Polyester film |
| JPS5868225A (en) * | 1981-10-13 | 1983-04-23 | Toray Ind Inc | Magnetic recording medium |
| JPS58168655A (en) * | 1982-03-30 | 1983-10-05 | Toray Ind Inc | Magnetic recording medium |
-
1983
- 1983-11-21 JP JP21893183A patent/JPS60111322A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5610455A (en) * | 1979-07-09 | 1981-02-02 | Toray Industries | Polyester film |
| JPS5868225A (en) * | 1981-10-13 | 1983-04-23 | Toray Ind Inc | Magnetic recording medium |
| JPS58168655A (en) * | 1982-03-30 | 1983-10-05 | Toray Ind Inc | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60111322A (en) | 1985-06-17 |
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