JPH0416848B2 - - Google Patents

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Publication number
JPH0416848B2
JPH0416848B2 JP62064488A JP6448887A JPH0416848B2 JP H0416848 B2 JPH0416848 B2 JP H0416848B2 JP 62064488 A JP62064488 A JP 62064488A JP 6448887 A JP6448887 A JP 6448887A JP H0416848 B2 JPH0416848 B2 JP H0416848B2
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Japan
Prior art keywords
underlayer
hcp
magnetic
bcc
copt
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Expired - Lifetime
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JPS62257618A (ja
Inventor
Kento Hawaado Jeemuzu
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International Business Machines Corp
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International Business Machines Corp
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    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
    • G11B5/65—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
    • G11B5/656—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition containing Co
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • G11B5/7373—Non-magnetic single underlayer comprising chromium
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73913—Composites or coated substrates
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73917—Metallic substrates, i.e. elemental metal or metal alloy substrates
    • G11B5/73919—Aluminium or titanium elemental or alloy substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/928—Magnetic property
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12597—Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12625—Free carbon containing component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12674—Ge- or Si-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/12743—Next to refractory [Group IVB, VB, or VIB] metal-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
    • Y10T428/12826—Group VIB metal-base component
    • Y10T428/12847—Cr-base component
    • Y10T428/12854—Next to Co-, Fe-, or Ni-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12937—Co- or Ni-base component next to Fe-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12944—Ni-base component

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)
  • Thin Magnetic Films (AREA)

Description

【発明の詳細な説明】
Ａ 産業上の利用分野 本発明は薄膜状の合金材磁気記録媒体に係り、
特に水平記録用の薄膜状の合金材磁気デイスクに
関し、この磁気デイスクにおいてはコバルト及び
白金を含む合金材が磁性層を形成し且つ磁性層と
デイスク基材との間の特殊なクロム合金材下地層
（非磁性層）によつて記録媒体の性質が改良され
ている。 Ｂ 従来技術 種々の白金含有率を有するコバルト−白金合金
材が、水平記録用の薄膜状の磁気記録デイスクに
おける磁性物質として用いられてきた。このよう
なデイスクでは、コバルト−白金（CoPt）合金
の六方最密充てん（hexagonal close packed：
HCP）結晶構造が基材上にあるいは中間の下地
層（非磁性層）上に形成されるので、CoPt膜の
Ｃ−軸、即ち〔002〕軸構造が膜平面内に存在し、
あるいは、膜平面内にそのような成分を有するこ
ととなる。 CoPt膜の保磁力（Hc）は白金の組成に依存
し、最大のHcは約20原子パーセント（at.％）白
金において生じる。これについては、J.A.
Aboaf，その他の“Magnetic Properties and
Structure of Co−Pt Thin Films”、IEEE
Trans on Magnetics、MAG−19、1514（1983）、
及びM.Kitada、その他の“Magnetic
Properties of Sputtered Co−pt Thin Films”、
J.Appl.Phys.54（12）、December1983、pp.7089−
7094を参照のこと。コバルト−白金膜の保磁力及
びその他の性質については、Opfer、その他の
“Thin−Film Memory Disc Development、”
Hewlett−Packard Journal、Novemfer 1985、
pp.4−10に、また、10から30at.％の白金を含む
CoPtの薄膜状の磁気記録媒体については本出願
人に譲渡された米国特許第4438066号に記述され
ている。 コバルト−白金−クロム（CoPtCr）の磁性層
を有する薄膜デイスクについては、ここにおいて
クロム（Cr）は磁性層の耐食性を改良するため
に加えられるが、1984年５月22日に公開された特
開昭59−88806号（特願昭57−198568号）に記述
されている。CoPtCr磁性層は適当な基材上に形
成されたニツケル−リン化合物（NiP）上に付着
されている。 ある種のデイスクにおいてはCo Pt磁性層の磁
気的性質を改良するために、基材とCo Pt磁性層
との間に種々の下地層が形成されている。Co Pt
薄膜デイスクにおけるCr下地層の利用がOpfer等
の前記文献及び1985年６月19日に発行され
Hewlett−Packard社に譲渡された殴州特許出願
第145157号に記述されている。1985年５月８日に
発行され本出願人に譲渡された欧州特許出願
140513号には、Co基調のHCP磁性層がCo基調の
第１体心立方（BCC）非磁性層上に付着されて
いるような、水平記録用の種々の磁気記録構造が
記述されている。このうち、採用可能な構造の１
つは、１から35at.％の白金を含むCoPt磁性層で
あり、これはXCo層上に形成されている。ここ
で、Ｘは60から90at.％のCrあるいはバナジウム
（Ｖ）である。前記欧州特許出願には、HCP磁性
層の（110）平面を有するBCC下地層の（002）
平面との“偽格子”合致のために、HCP磁性層
のＣ軸の平面内配向が増大することが記述されて
いる。 このように、従来より種々の構造の磁気記録媒
体が知られているが、保磁力や矩形性において改
良の余地のあるものであつた。 Ｃ 解決しようとする問題点 本発明は、磁気記録媒体の保磁力及び矩形性を
改良しようとするものである。 Ｄ 問題点を解決するための手段 本発明は水平記録用の改良したCoPt或いは
CoPtCr薄膜磁気記録デイスクであり、デイスク
の磁気的性質を改良するために、基材とCoPt或
いはCrPrCr磁性層との間の体心立方（BCC）ク
ロム合金の非磁性的下地層を利用している。クロ
ム−バナジウム（CrV）或いはクロム−鉄
（CrFe）のようなBCCクロム合金はaBCCで表わ
される格子定数を有し、この格子定数aBCCは
BCC CrCo或いはBCC Cr単独の場合よりも大き
く、磁気層中の六方最密充てん（HCP）CoPt或
【表】 デイスクの保磁力については例１と例３とは同
様の結果であるが、矩形比Ｓについては例３が高
い値を示している。 第１図には、種々の厚さのCo80Pt20に対するCr
及びCrV下地層を有するデイスクにおける矩形
比、即ち、飽和磁化に対する残留磁比（Mr／
Ms）の測定値が描かれている。第１図中の全て
の値は付着時の基材温度Tsが128℃において得ら
れたものである。第１図中の中を塗り潰した点は
Co80Pt20磁性層上に厚さ250Åの保護用のカーボ
ン上部被膜がスパツタ付着されている場合のデイ
スクについて示している。 Cr80V20合金下地層をCoPtCr薄膜合金デイスク
にも用いた。表２は２つの（Co85Pt15）93.5Cr6.5デ
イスクの磁気的性質を比較している。１つは400
ÅのCr下地層を有し、他の１つは400Åの
Cr80V20合金材下地層を有しており、デイスクに
ついてのこれ以外の性質は同じものである。CrV
下地層を設けることによりデイスクの保磁力Hc、
矩形比Ｓ、及び保磁力矩形比S*が少し改良して
いる。
【表】 500ÅのCr80V20下地層上に付着された400Åの
Co80Pt20薄膜をＸ線散乱分析により試験した。そ
の結果にはHCP相と面心立方（FCC）相との微
結晶の混合が示されていた。500ÅのCr下地層上
に付着された同じ厚さのCo80Pt20薄膜は、これに
反して、FCCが全く観察されない、HCP相だけ
が存在していた。Cr80V20下地層を200Åの厚さに
減らすと、500ÅのCo80Pt20薄膜の保磁力は
400Oeに減り、Co80Pt20薄膜の主たる相はFCCで
あつた。IEEE Transaction Magnetics、MAG
−17、3187（1981）中でChen等は、コバルト−レ
ニウム（CoRe）合金薄膜におけるFCC相の研究
を報告している。研究結果には、微結晶の粒径が
HCPからFCC相への変換の結果として減小して
いることが示されている。Chen等の結果によれ
ば、CoRe膜の保磁力の減小はFCC微結晶自身の
存在によるよりは同等異像の相変換の結果として
の粒径の減小によつて第一義的に影響されている
ことが報告されている。しかしながら、高保磁力
値（およそ1550から1630Oe）が500ÅのCr80V20
下地層上の400ÅのCo80Pt20に存在するというこ
とは２相構造は保磁力機構に対してそれ程の影響
を与えていないということを示している。このよ
うに、500ÅのCr80V20下地層上の400Åの
Co80Pt20の高保磁力及び高矩形比は、粒径の減小
を伴わないCo80Pt20膜中の２相微細構造の構造と
合致する。 CrV下地層に起因するCoPtの改良された矩形
比はCo80Pt20膜のBCCC CrV合金とHCP相との
間の密接な格子合致の結果であると信じられる。 BCC結晶は単結晶セル定数aBCCを有してい
る。BCC結晶の（200）平面は（20.5）（aBCC）×
（20.5）（aBCC）の面積の正方形である。第２Ａ図
参照。HCP結晶は２つのセル定数CHCP及びaHCPを
有し、CHCPは〔002〕或いはＣ軸に平行であり、
aHCPはＣ軸に直交し〔010〕軸に平行である。
HCP結晶の（110）平面は面積（CHCP）×（30.5）
（aHCP）の長方形である。第２Ｂ図参照。HCPの
CoPt相は、CoPtの（110）平面がBCC下地層の
（200）平面と同じ面積を有するときに、BCC下
地層に“格子合致”される。表３はCr及びCr合
金下地層のCo80Pt20デイスクについての、Ｘ線散
乱分析により決定された、格子セル定数を掲示し
ている。
【表】 種々のBCC Cr合金材下地層についてのHCP
CoPt磁性層のセル定数の各セル定数に対する不
適合率（％）が第３図に図示されている。第３図
に示されるように、Cr80V20はCrやCrCoよりも一
層近密な格子合致を行なわせる。CrCoやCrより
も値の大きなaBCCを有し、またCoPtと良好な格子
合致を与え易いものはクロム−鉄（CrFe）であ
る。aHCP＝2.62Å及びCHCP＝4.22Åとしたときの
aBCC＝3.00のBCC Cr80Fe20についてのHCP
Co80Pt20の不一致が第３図に示されている。この
ように、CrFeの下地層は、CrCoやCrの下地層を
有する従来の膜よりも優れた矩形比を有する
CoPt膜をもたらす。 前述の例のようにシリコン基材を用いるときに
は、膜の平面内において磁性層のHCP相のＣ軸
配向を改良することが求められる。Cr Ｖ及び
CrFe下地層はこの要求に合致する。基材が別の
物質であるときには、例えばアルミニウム合金デ
イスク上に形成されたニツケル−リン（NiP）の
ような物質であるときには、下地層は絶対的に不
可欠なものではないが、平面内のＣ軸配向を改良
する上では利点がある。本発明の下地層は基材が
アルミニウム合金デイスク上に形成されたNiP膜
のときにＣ軸配向を増大させるので薄膜デイスク
の磁気的性質を改良する。 以上、磁性層及び下地層（非磁性層）について
述べたが、例えば、アモルフアスカーボン膜のよ
うな保護層が上部にスパツタにより形成されても
よいし、スパツタ形成されたチタニウム膜のよう
な接着層が保護層と磁性層との間に設けられてい
てもよい。 Ｆ 発明の効果 上述のように、本発明によれば、高い保磁力及
び高い矩形性を有する磁気記録媒体を提供でき
る。
【図面の簡単な説明】
第１図は下地層（非磁性層）がCr Ｖ及びCrで
ある場合の夫々についてのCo Pt磁性層の種々の
厚さと矩形比Mr／Msとの関係を示すグラフ、第
２Ａ及び２Ｂ図は夫々BCC及びHCPについての
格子構造と格子合致すべき平面とを示す図、第３
図はCo PtのHCP相と種々のBCC Cr合金材との
間の格子不適合を示すグラフである。

Claims (1)

  1. 【特許請求の範囲】 １ 基板と、 前記基板上に形成された、バナジウムあるいは
    鉄のいずれか一方とクロムとを含む合金材から成
    る非磁性下地層と、 前記非磁性下地層に形成された、コバルトと白
    金とを含む合金材の磁性層と、 を有する水平記録用の磁気記録媒体。
JP62064488A 1986-04-29 1987-03-20 磁気記録媒体 Granted JPS62257618A (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US06/857,020 US4652499A (en) 1986-04-29 1986-04-29 Magnetic recording medium with a chromium alloy underlayer and a cobalt-based magnetic layer
US857020 1992-03-24
SG151494A SG151494G (en) 1986-04-29 1994-10-17 A magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS62257618A JPS62257618A (ja) 1987-11-10
JPH0416848B2 true JPH0416848B2 (ja) 1992-03-25

Family

ID=26664442

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62064488A Granted JPS62257618A (ja) 1986-04-29 1987-03-20 磁気記録媒体

Country Status (10)

Country Link
US (1) US4652499A (ja)
EP (1) EP0243672B1 (ja)
JP (1) JPS62257618A (ja)
AT (1) ATE71231T1 (ja)
BR (1) BR8701656A (ja)
CA (1) CA1269896A (ja)
DE (1) DE3775606D1 (ja)
ES (1) ES2028813T3 (ja)
HK (1) HK138994A (ja)
SG (1) SG151494G (ja)

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Also Published As

Publication number Publication date
EP0243672B1 (en) 1992-01-02
SG151494G (en) 1995-03-17
EP0243672A2 (en) 1987-11-04
EP0243672A3 (en) 1989-08-23
HK138994A (en) 1994-12-16
BR8701656A (pt) 1988-01-12
DE3775606D1 (de) 1992-02-13
ATE71231T1 (de) 1992-01-15
JPS62257618A (ja) 1987-11-10
CA1269896A (en) 1990-06-05
ES2028813T3 (es) 1992-07-16
US4652499A (en) 1987-03-24

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