JPS6313255B2 - - Google Patents

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Publication number
JPS6313255B2
JPS6313255B2 JP9609484A JP9609484A JPS6313255B2 JP S6313255 B2 JPS6313255 B2 JP S6313255B2 JP 9609484 A JP9609484 A JP 9609484A JP 9609484 A JP9609484 A JP 9609484A JP S6313255 B2 JPS6313255 B2 JP S6313255B2
Authority
JP
Japan
Prior art keywords
ferrite
magnetic
thin film
perpendicular magnetization
recording
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
Application number
JP9609484A
Other languages
Japanese (ja)
Other versions
JPS60239917A (en
Inventor
Akira Mochizuki
Tetsuo Yamaguchi
Noribumi Kikuchi
Takayuki Shingyochi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Metal Corp
Original Assignee
Mitsubishi Metal Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Metal Corp filed Critical Mitsubishi Metal Corp
Priority to JP9609484A priority Critical patent/JPS60239917A/en
Publication of JPS60239917A publication Critical patent/JPS60239917A/en
Publication of JPS6313255B2 publication Critical patent/JPS6313255B2/ja
Granted legal-status Critical Current

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Description

【発明の詳細な説明】[Detailed description of the invention]

〔産業上の利用分野〕 この発明は、耐摩耗性および磁気記録特性にす
ぐれ、かつ膜面に対して垂直の磁気異方性をもつ
た磁気記録媒体の薄膜を具備した垂直磁化記録体
にして、高密度の磁気記録を可能とする垂直磁化
記録機能をもつた磁気デイスク、フロツピーデイ
スク、オーデイオ用磁気テープ、VTR用磁気テ
ープ、磁気写真用デイスク、さらにコンピユータ
用磁気テープなどの垂直磁化記録体に関するもの
である。 〔従来技術およびその問題点〕 これらの垂直磁化記録体は、通常、プラスチツ
クフイルムや金属シート、さらに金属デイスクや
ガラスデイスクなどの基板の表面に、スパツタリ
ング法や真空蒸着法、さらに化学メツキ法などの
表面処理技術を用いて、膜面に対して垂直の磁気
異方性をもつたCo−Cr合金やCo−Ru合金、さら
にCo−Cr−Ru合金などのCo系合金で構成された
磁気記録媒体の薄膜を、直接、あるいは高透磁率
をもつたFe−Ni合金などの薄膜を介して形成す
ることによつて製造されている。しかし、上記の
垂直磁化記録体は、すぐれた垂直磁化特性をもつ
ものの、Co系合金で構成された磁気記録媒体の
薄膜が軟質であるために、磁気記録時に、Mn−
Zn系フエライトの単結晶や高密度フエライト、
さらにセンダストや非晶質金属などの硬質の材料
で構成されている磁気ヘツドと摩擦接触すると著
しく摩耗し、かつ損傷を受け易いことから、実用
に際しては、さらにその上に数100〜数1000Å程
度の膜厚で、アルミナ(Al2O3)やシリカ
(SiO2)などで構成された非磁性硬質薄膜を形成
し、磁気ヘツドによる摩耗の抑制をはかつている
のが現状である。 しかしながら、この耐摩耗性にすぐれた従来垂
直磁化記録体においても、上記のように最上層が
Al2O3やSiO2などの非磁性薄膜で構成されている
ために、磁気記録に際しては、磁気が前記最上層
の膜厚分だけ離された状態、すなわちスペースロ
スのある状態で、下層の磁気記録媒体に磁気記録
がなされることになることから、その分だけ磁気
記録密度が低下することになる。 〔研究の目的および研究に基づく知見事項〕 そこで、本発明者等は、上述のような観点か
ら、耐摩耗性にすぐれ、かつ磁気記録密度の低下
のない垂直磁化記録体を開発すべく研究を行なつ
た結果、垂直磁化記録体における膜面に対して垂
直の磁気異方性をもつたCo系合金で構成された
磁気記録媒体の薄膜の上面に、通常のスパツタリ
ング法にて、ターゲツトとして、Niフエライト、
Ni−Znフエライト、あるいはMn−Znフエライ
トを用い、このフエライトの薄膜を形成すると、
前記フエライト薄膜は、すぐれた耐摩耗性と磁気
特性をもつことから、この結果の最上層がNiフ
エライト、Ni−Znフエライト、あるいはMn−
Znフエライトの薄膜で構成された垂直磁化記録
体においては、磁気記録に際して、磁気ヘツドに
よる摩耗および損傷がほとんど皆無となつた状態
で、高密度の磁気記録を行なうことが可能となる
という知見を得たのである。 〔発明の構成要件〕 この発明は、上記知見にもとづいてなされたも
のであつて、膜面に対して垂直の磁気異方性をも
つたCo系合金で構成された磁気記録媒体の薄膜
の上面に、最上層として耐摩耗性および磁気特性
のすぐれたNiフエライト、Ni−Znフエライト、
あるいはMn−Znフエライトからなる薄膜を形成
してなる垂直磁化記録体に特徴を有するものであ
る。 〔実施例〕 つぎに、この発明の垂直磁化記録体を実施例に
より具体的に説明する。 基板として、厚さ:50μmのポリエステルフイ
ルムを用意し、この基板を通常のマグネトロンス
パツタ装置に装着し、回転を加えながら、それぞ
れFe−Ni合金(Ni:50%含有)、Co−Cr合金
(Cr:18%含有)、アルミナ(Al2O3)、シリカ
(SiO2)、Niフエライト、Ni−Znフエライト、
Mn−Znフエライトのターゲツトを用い、 (1) 到達真空度:2.0×10-6torr以下、 (2) Arガス圧:3.0×10-3torr、 (3) 基板とターゲツト間の距離:50mm (4) 放電パワーおよびスパツタ時間、 (a) Co−Cr合金およびFe−Ni合金ターゲツト
の場合:DC360Wで400秒、 (b) Niフエライト、Ni−Znフエライト、Mn
−Znフエライト、Al2O3、およびSiO2ターゲ
ツトの場合:RF100Wで600秒、 の条件でスパツタを行ない、それぞれ第1表に示
される平均層厚をもつた薄膜を上記基板表面に順
次形成することによつて本発明垂直磁化記録体1
〜3および従来垂直磁化記録体1,2をそれぞれ
製造した。 ついで、この結果得られた各種の垂直磁化記録
体について、振動型磁気測定装置を用いて、異方
性磁界(Hk)と保磁力(Hc)を測定し、さらに
これをフロツピーデイスクサイズに形成し、フエ
ライトヘツドを備えたデイスクドライブ装置を用
いて走行テストを行ない、耐摩耗性を評価する目
的で、100万バス経過後の再生電圧(Vm)の初
期再生電圧(Vi)に対する比、すなわちr=
Vm/Vi(劣化率)を測定し、かつ高密度磁気記
録特性を評価する目的で、記録密度を変化
[Industrial Application Field] The present invention provides a perpendicular magnetization recording medium having a thin film of a magnetic recording medium that has excellent wear resistance and magnetic recording properties and has magnetic anisotropy perpendicular to the film surface. , perpendicular magnetization recording media such as magnetic disks with perpendicular magnetization recording function that enable high-density magnetic recording, floppy disks, magnetic tapes for audio, magnetic tapes for VTRs, magnetic photographic disks, and magnetic tapes for computers. It is related to. [Prior art and its problems] These perpendicular magnetization recording bodies are usually produced by sputtering, vacuum evaporation, chemical plating, etc. on the surface of a substrate such as a plastic film, metal sheet, metal disk, or glass disk. Magnetic recording media made of Co-based alloys such as Co-Cr alloys, Co-Ru alloys, and Co-Cr-Ru alloys that have magnetic anisotropy perpendicular to the film surface using surface treatment technology. It is manufactured by forming a thin film directly or through a thin film of Fe-Ni alloy with high magnetic permeability. However, although the perpendicular magnetization recording medium described above has excellent perpendicular magnetization characteristics, the thin film of the magnetic recording medium made of Co-based alloy is soft, so during magnetic recording, Mn-
Single crystals of Zn-based ferrite, high-density ferrite,
Furthermore, frictional contact with a magnetic head made of hard materials such as sendust or amorphous metal causes significant wear and is likely to cause damage. Currently, a hard, non-magnetic thin film made of alumina (Al 2 O 3 ), silica (SiO 2 ), etc. is formed to suppress wear caused by the magnetic head. However, even in conventional perpendicular magnetization recording materials with excellent wear resistance, the top layer is
Since it is composed of a non-magnetic thin film such as Al 2 O 3 or SiO 2 , during magnetic recording, the magnetic field is separated by the thickness of the uppermost layer, that is, in a state where there is a space loss. Since magnetic recording will be performed on the magnetic recording medium, the magnetic recording density will decrease accordingly. [Purpose of the research and findings based on the research] Therefore, from the above-mentioned viewpoints, the present inventors conducted research to develop a perpendicular magnetization recording medium that has excellent wear resistance and does not reduce magnetic recording density. As a result, using a normal sputtering method, as a target, a thin film of a magnetic recording medium made of a Co-based alloy with magnetic anisotropy perpendicular to the film surface of the perpendicular magnetization recording medium was coated. Ni ferrite,
When a thin film of Ni-Zn ferrite or Mn-Zn ferrite is formed,
Since the ferrite thin film has excellent wear resistance and magnetic properties, the resulting top layer is made of Ni ferrite, Ni-Zn ferrite, or Mn-ferrite.
We have obtained the knowledge that perpendicularly magnetized recording bodies composed of thin films of Zn ferrite can perform high-density magnetic recording with almost no wear or damage caused by the magnetic head. It was. [Elements of the Invention] The present invention has been made based on the above findings, and is based on the above-mentioned findings. The top layer is Ni ferrite, Ni-Zn ferrite, which has excellent wear resistance and magnetic properties.
Alternatively, it is characterized by a perpendicular magnetization recording body formed by forming a thin film made of Mn--Zn ferrite. [Example] Next, the perpendicular magnetization recording body of the present invention will be specifically explained with reference to Examples. A polyester film with a thickness of 50 μm was prepared as a substrate, and this substrate was mounted on a normal magnetron sputtering device, and while rotating, Fe-Ni alloy (containing 50% Ni) and Co-Cr alloy (containing 50% Ni) were prepared. Cr: 18% content), alumina (Al 2 O 3 ), silica (SiO 2 ), Ni ferrite, Ni-Zn ferrite,
Using a Mn-Zn ferrite target, (1) ultimate vacuum: 2.0×10 -6 torr or less, (2) Ar gas pressure: 3.0×10 -3 torr, (3) distance between substrate and target: 50 mm ( 4) Discharge power and sputtering time, (a) For Co-Cr alloy and Fe-Ni alloy targets: 400 seconds at DC360W, (b) Ni ferrite, Ni-Zn ferrite, Mn
- For Zn ferrite, Al 2 O 3 and SiO 2 targets: Perform sputtering at RF 100W for 600 seconds under the following conditions to sequentially form thin films with the average layer thickness shown in Table 1 on the above substrate surface. In particular, perpendicular magnetization recording body 1 of the present invention
- 3 and conventional perpendicular magnetization recording bodies 1 and 2 were manufactured, respectively. Next, the anisotropic magnetic field (Hk) and coercive force (Hc) of the various perpendicularly magnetized recording bodies obtained as a result were measured using a vibrating magnetic measuring device, and then this was formed into a floppy disk size. However, in order to evaluate the wear resistance by conducting a running test using a disk drive device equipped with a ferrite head, we determined the ratio of the reproducing voltage (Vm) to the initial reproducing voltage (Vi) after 1 million bus cycles, that is, r =
Varying recording density for the purpose of measuring Vm/Vi (deterioration rate) and evaluating high-density magnetic recording characteristics

〔総括的効果〕[Overall effect]

上述のように、この発明の垂直磁化記録体は、
その最上層を実質的にNiフエライト、Ni−Znフ
エライトあるいはMn−Znフエライトからなる薄
膜で構成することによつて、すぐれた耐摩耗性が
確保され、かつ高密度の磁気記録を可能としたも
のである。
As mentioned above, the perpendicular magnetization recording body of the present invention has the following features:
The top layer is made of a thin film consisting essentially of Ni ferrite, Ni-Zn ferrite, or Mn-Zn ferrite, ensuring excellent wear resistance and enabling high-density magnetic recording. It is.

Claims (1)

【特許請求の範囲】[Claims] 1 表面薄膜が膜面に対して垂直の磁気異方性を
もつたCo系合金の磁気記録媒体で構成された垂
直磁化記録媒体において、前記表面薄膜の上に、
さらに耐摩耗性および磁気特性のすぐれたNiフ
エライト、Ni−Znフエライト、あるいはMn−
Znフエライトからなる薄膜を形成してなる垂直
磁化記録体。
1. In a perpendicular magnetization recording medium composed of a Co-based alloy magnetic recording medium in which the surface thin film has magnetic anisotropy perpendicular to the film surface, on the surface thin film,
In addition, Ni ferrite, Ni−Zn ferrite, or Mn− ferrite, which has excellent wear resistance and magnetic properties,
A perpendicular magnetization recording material made of a thin film made of Zn ferrite.
JP9609484A 1984-05-14 1984-05-14 Vertically magnetizable recording body Granted JPS60239917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9609484A JPS60239917A (en) 1984-05-14 1984-05-14 Vertically magnetizable recording body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9609484A JPS60239917A (en) 1984-05-14 1984-05-14 Vertically magnetizable recording body

Publications (2)

Publication Number Publication Date
JPS60239917A JPS60239917A (en) 1985-11-28
JPS6313255B2 true JPS6313255B2 (en) 1988-03-24

Family

ID=14155804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9609484A Granted JPS60239917A (en) 1984-05-14 1984-05-14 Vertically magnetizable recording body

Country Status (1)

Country Link
JP (1) JPS60239917A (en)

Also Published As

Publication number Publication date
JPS60239917A (en) 1985-11-28

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