JP2000311327A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JP2000311327A JP2000311327A JP11121693A JP12169399A JP2000311327A JP 2000311327 A JP2000311327 A JP 2000311327A JP 11121693 A JP11121693 A JP 11121693A JP 12169399 A JP12169399 A JP 12169399A JP 2000311327 A JP2000311327 A JP 2000311327A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- intermediate layer
- layer
- recording medium
- substrate
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気ディスク装置
などに用いられる積層構造を持つ面内磁気記録媒体に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a longitudinal magnetic recording medium having a laminated structure used for a magnetic disk drive or the like.
【０００２】[0002]
【従来の技術】従来は、米国特許５，０５１，２８８号
で述べられているように、磁性層を非磁性層により分離
した積層構造とすることにより媒体ノイズを低減できる
ことが明らかとなっていたが、その際、非磁性中間層と
しては、主にＣｒなどの体心立方構造の金属が用いられ
てきた。2. Description of the Related Art Conventionally, as described in U.S. Pat. No. 5,051,288, it has been clarified that a medium noise can be reduced by forming a laminated structure in which a magnetic layer is separated by a non-magnetic layer. However, at that time, as the nonmagnetic intermediate layer, a metal having a body-centered cubic structure such as Cr has been mainly used.
【０００３】しかしながら、膜面内で異方性を持つ媒体
を目的とした場合には、このような非磁性中間層は、六
方最密構造の磁性層とは結晶構造が異なるために、一層
目のの磁性層のｃ軸（３回対称軸）が円周方向に向いて
いる場合でも、中間層上に形成した磁性層においてはｃ
軸の方向の制御が困難となるという問題点があった。[0003] However, when a medium having anisotropy in the film plane is intended, such a nonmagnetic intermediate layer has a different crystal structure from the magnetic layer having a hexagonal close-packed structure. Even when the c-axis (three-fold symmetry axis) of the magnetic layer is oriented in the circumferential direction, the magnetic layer formed on the intermediate layer has c-axis.
There was a problem that it was difficult to control the direction of the axis.
【０００４】また、膜面内の配向がランダムな従来の積
層媒体においても、一般的な体心立方構造の中間層を用
いた場合、上部磁性層の結晶性が低下し、磁気特性が低
下するという問題があった。Further, even in a conventional laminated medium in which the orientation in the film plane is random, when an intermediate layer having a general body-centered cubic structure is used, the crystallinity of the upper magnetic layer is reduced and the magnetic characteristics are reduced. There was a problem.
【０００５】これらを改善するために、六方最密構造の
中間層の採用が試みられているが、実際には、十分な飽
和保持力を得るためには中間層厚をかなり厚くする必要
があり、その場合には下部磁性層とヘッドとの距離が遠
くなるために、記録分解能が低下するという問題があっ
た。In order to improve these, an attempt has been made to employ an intermediate layer having a hexagonal close-packed structure. However, in practice, it is necessary to increase the thickness of the intermediate layer considerably in order to obtain a sufficient saturation holding power. In this case, however, the distance between the lower magnetic layer and the head is long, and there is a problem that the recording resolution is reduced.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記の問題
を解決するためになされたものであって、磁性層と非磁
性層とからなる積層型媒体において、高保磁力と高記録
分解能を両立することができる磁気記録媒体を提供する
ことを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has been made in order to achieve both high coercive force and high recording resolution in a laminated medium comprising a magnetic layer and a non-magnetic layer. It is an object of the present invention to provide a magnetic recording medium capable of performing the following.
【０００７】[0007]
【課題を解決するための手段】本発明は、第１に、少な
くとも一主面上に円周方向のテクスチャを有する基板
と、該基板上に形成されたコバルトを主成分とする第１
の磁性層、該第１の磁性層上に形成された六方最密構造
を有する非磁性中間層、及び該非磁性中間層上に形成さ
れたコバルトを主成分とする第２の磁性層を具備するこ
とを特徴とする磁気記録媒体を提供する。SUMMARY OF THE INVENTION The present invention firstly provides a substrate having a circumferential texture on at least one principal surface thereof, and a first substrate mainly formed of cobalt formed on the substrate.
, A nonmagnetic intermediate layer having a hexagonal close-packed structure formed on the first magnetic layer, and a second magnetic layer containing cobalt as a main component and formed on the nonmagnetic intermediate layer. A magnetic recording medium is provided.
【０００８】本発明は、第２に、基板、該基板上に設け
られたコバルト白金を主成分とする第１の磁性層、該第
１の磁性層上に設けられ、ルテニウム、レニウム、及び
オスミウムからなる群から選択される少なくとも１種を
含み、２ないし５ｎｍの厚さを有する非磁性中間層、及
び非磁性中間層上に設けられたコバルト白金を主成分と
する第２の磁性層を具備することを特徴とする磁気記録
媒体を提供する。According to the present invention, there is provided a substrate, a first magnetic layer mainly composed of cobalt platinum provided on the substrate, ruthenium, rhenium, and osmium provided on the first magnetic layer. A nonmagnetic intermediate layer containing at least one member selected from the group consisting of and having a thickness of 2 to 5 nm, and a second magnetic layer containing cobalt platinum as a main component and provided on the nonmagnetic intermediate layer. A magnetic recording medium is provided.
【０００９】[0009]
【発明の実施の形態】本発明の第１の観点によれば、少
なくとも一主面上に円周方向のテクスチャを有する基板
上に、コバルトを主成分とする磁性層と非磁性中間層と
を順に交互に積層した構造を有し、コバルトを主成分と
する磁性層を少なくとも２層、非磁性中間層を少なくと
も１層含む積層型磁気記録媒体において、非磁性中間層
は、六方最密構造を有することを特徴とする積層型磁気
記録媒体が提供される。According to a first aspect of the present invention, a magnetic layer mainly containing cobalt and a non-magnetic intermediate layer are formed on a substrate having a circumferential texture on at least one principal surface. In a laminated magnetic recording medium having a structure in which at least two magnetic layers containing cobalt as a main component and at least one nonmagnetic intermediate layer have a structure in which the nonmagnetic intermediate layer has a hexagonal close-packed structure. A laminated magnetic recording medium is provided.
【００１０】本発明の第１の観点に係る磁気記録媒体
は、テクスチャを有する基板上に形成され、その上に形
成される各磁性層が、非磁性中間層により分割された構
成を有する。この媒体では、非磁性中間層として磁性層
と同じ結晶構造を持つ中間層を用いることにより、テク
スチャの影響により円周方向に異方性を有する基板上に
形成される磁性層と同様に、非磁性中間層上の磁性層に
も円周方向の異方性を持たせることができる。このた
め、得られる磁気記録媒体は、その円周方向の保磁力が
向上し、これにより十分な記録分解能を有する。The magnetic recording medium according to the first aspect of the present invention has a configuration in which a magnetic layer formed on a textured substrate is divided by a non-magnetic intermediate layer. In this medium, by using an intermediate layer having the same crystal structure as the magnetic layer as the non-magnetic intermediate layer, the non-magnetic intermediate layer has a non-magnetic intermediate layer similar to a magnetic layer formed on a substrate having circumferential anisotropy due to the influence of texture. The magnetic layer on the magnetic intermediate layer can also have circumferential anisotropy. For this reason, the obtained magnetic recording medium has an improved coercive force in the circumferential direction, thereby having a sufficient recording resolution.
【００１１】好ましくは、非磁性中間層は、ルテニウ
ム、レニウム、及びオスミウムからなる群から選択され
る少なくとも１種を含み、さらに好ましくはルテニウム
から実質的になる。Preferably, the non-magnetic intermediate layer contains at least one selected from the group consisting of ruthenium, rhenium and osmium, and more preferably consists essentially of ruthenium.
【００１２】なお、テクスチャを持たない基板を用いて
も、基板上の下地層を例えばスパッタ粒子を基板に対し
て斜め方向から入射させるなどの方法等で形成すること
により円周方向に異方性を持たせた場合には、第１の観
点に係る発明と同様の効果が得られる。Even if a substrate having no texture is used, an underlayer on the substrate can be formed in a circumferential direction by forming a sputtered particle on the substrate in an oblique direction. , The same effect as the invention according to the first aspect can be obtained.
【００１３】本発明の第２の観点によれば、基板上に、
コバルト白金を主成分とする磁性層と、非磁性中間層と
を順に交互に積層した構造を有し、少なくとも２層のコ
バルト白金を主成分とする磁性層と少なくとも１層の非
磁性中間層とを含む積層型磁気記録媒体であって、非磁
性中間層は、ルテニウム、レニウム、及びオスミウムか
らなる群から選択される少なくとも１種を含み、２ない
し５ｎｍの厚さをもつことを特徴とする積層型磁気記録
媒体が提供される。According to a second aspect of the present invention, on a substrate:
It has a structure in which a magnetic layer containing cobalt platinum as a main component and a non-magnetic intermediate layer are alternately laminated, and at least two magnetic layers containing cobalt platinum as a main component and at least one non-magnetic intermediate layer. Wherein the non-magnetic intermediate layer includes at least one selected from the group consisting of ruthenium, rhenium, and osmium, and has a thickness of 2 to 5 nm. Type magnetic recording medium is provided.
【００１４】第２の観点にかかる磁気記録媒体によれ
ば、基板上に形成される各磁性層が、非磁性中間層によ
り分割された構成を有する。この媒体では、非磁性中間
層として磁性層と同じ結晶構造を持つ特にルテニウム、
レニウム、及びオスミウムからなる群から選択される少
なくとも１種を含む非磁性中間層を２ないし５ｎｍの厚
さで用いることにより、その上に形成される上部磁性層
の結晶性を下部磁性層と同程度となるように形成しう
る。このため、この媒体を用いると、十分な飽和保磁力
を得ることができる。また、非磁性中間層の厚さが十分
に薄く、ヘッドと下部磁性層との距離を短くできるの
で、磁性層全体の厚さを厚くすることがなく、十分な記
録分解能が得られる。According to the magnetic recording medium of the second aspect, each magnetic layer formed on the substrate has a structure divided by a non-magnetic intermediate layer. In this medium, as the non-magnetic intermediate layer, especially ruthenium having the same crystal structure as the magnetic layer,
By using a nonmagnetic intermediate layer containing at least one selected from the group consisting of rhenium and osmium at a thickness of 2 to 5 nm, the crystallinity of the upper magnetic layer formed thereon is the same as that of the lower magnetic layer. It can be formed to the extent. Therefore, when this medium is used, a sufficient coercivity can be obtained. Further, since the thickness of the non-magnetic intermediate layer is sufficiently small and the distance between the head and the lower magnetic layer can be reduced, sufficient recording resolution can be obtained without increasing the thickness of the entire magnetic layer.
【００１５】また、第２の観点に係る磁気記録媒体を用
いることにより、下部磁性層の磁化物が十分な膜面内配
向を有するとき、その上部磁性層も十分な膜面内配向を
有するように制御できる。Further, by using the magnetic recording medium according to the second aspect, when the magnetized material of the lower magnetic layer has a sufficient in-plane orientation, the upper magnetic layer also has a sufficient in-plane orientation. Can be controlled.
【００１６】なお、非磁性中間層が２ｎｍ未満であると
きには上下磁性層が反強磁性的に結合した状態が生じる
ことが考えられるため、記録媒体としては不適当であ
り、また、５ｎｍを越えると、記録分解能が低下する。When the thickness of the non-magnetic intermediate layer is less than 2 nm, a state in which the upper and lower magnetic layers are antiferromagnetically coupled may occur, which is unsuitable as a recording medium. However, the recording resolution decreases.
【００１７】非磁性中間層は、好ましくはルテニウムか
ら実質的になる。The non-magnetic intermediate layer preferably consists essentially of ruthenium.
【００１８】[0018]
【実施例】以下、本発明を図面を参照して詳細に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.
【００１９】実施例１ ここでは、積層媒体における各層の作製はすべてＤＣマ
グネトロンスパッタリングにより行った。Example 1 Here, all the layers in the laminated medium were manufactured by DC magnetron sputtering.
【００２０】基板として、ＮｉＰメッキを施したガラス
基板表面にほぼ円周方向のテクスチャーを形成したもの
を用意した。As the substrate, a substrate having a substantially circumferential texture formed on the surface of a NiP-plated glass substrate was prepared.
【００２１】この基板上に下地層としてＣｒを５０ｎｍ
設けた。On this substrate, 50 nm of Cr is used as a base layer.
Provided.
【００２２】さらに下部磁性層として、微量のＯ2を含
んだＡｒ雰囲気中でＣｏ72Ｐｔ20Ｃｒ8合金ターゲット
のスパッタリングを行い、ＣｏＰｔＣｒＯ磁性層を形成
した。As a lower magnetic layer, a CoPtCrO magnetic layer was formed by sputtering a Co 72 Pt 20 Cr 8 alloy target in an Ar atmosphere containing a small amount of O 2 .
【００２３】この磁性層上に、非磁性中間層として、Ｒ
ｕを堆積させた。また、比較対象として非磁性中間層と
してＣｒを堆積する以外は同様にして磁気記録媒体を形
成した。On this magnetic layer, as a non-magnetic intermediate layer, R
u was deposited. A magnetic recording medium was formed in the same manner except that Cr was deposited as a non-magnetic intermediate layer as a comparative object.
【００２４】非磁性中間層上に再びＣｏＰｔＣｒＯ磁性
層の製膜を行った後、保護層として１０ｎｍのＣを積層
した。After a CoPtCrO magnetic layer was formed again on the nonmagnetic intermediate layer, 10 nm of C was laminated as a protective layer.
【００２５】得られた積層媒体について、非磁性中間層
により分離された磁性層の部分における膜面内の異方性
の概念図を図１に示す。FIG. 1 is a conceptual diagram showing the in-plane anisotropy of the obtained laminated medium in the portion of the magnetic layer separated by the non-magnetic intermediate layer.
【００２６】図１に示すように、どの層も六方最密構造
であるために３回対称軸（ｃ軸）を持ち、その方向は矢
印で表される。基板に施されたテクスチャーにより、下
部磁性層のｃ軸は円周方向に配向した成分が多く、非磁
性中間層および上部磁性層もこれとほぼ同様の配向を受
け継いだ結果、全体として円周方向に構造的な異方性が
ついている。As shown in FIG. 1, since each layer has a hexagonal close-packed structure, it has a three-fold symmetry axis (c-axis), and its direction is indicated by an arrow. Due to the texture applied to the substrate, the c-axis of the lower magnetic layer has many components oriented in the circumferential direction, and the non-magnetic intermediate layer and the upper magnetic layer inherit almost the same orientation, resulting in the circumferential direction as a whole. Has structural anisotropy.
【００２７】また、図２に、ＲｕおよびＣｒを中間層と
した円周方向に異方性を持つ積層媒体のヒステリシスル
ープを示す。FIG. 2 shows a hysteresis loop of a laminated medium having Ru and Cr as an intermediate layer and having anisotropy in the circumferential direction.
【００２８】図中、実線１０１は、Ｒｕを中間層とした
円周方向に異方性を持つ積層媒体のヒステリシスループ
を表す。破線１０２および一点鎖線１０３はそれぞれ、
一般的なＣｒ中間層を用いた積層媒体において、円周方
向および半径方向に磁界Ｈを印加した場合のループであ
る。これらのループの比較から、残留磁化および保磁力
とも明らかに円周方向の方が半径方向の場合より大き
く、円周方向に磁気的な異方性がついていることが分か
る。しかしながら、これは主に下部磁性層につけられた
円周方向の構造的な異方性によるものであり、Ｃｒ中間
層上の磁性層における円周方向の配向比は下部のそれよ
りも低下していると考えられる。実線がＲｕを中間層と
した場合の円周方向のヒステリシスループであり、Ｃｒ
を中間層とした場合のそれよりも保磁力が改善されてい
ることが分かる。このことは、磁性層と同じ結晶構造の
Ｒｕ中間層を用いたことにより、上部磁性層にも下部磁
性層と同様な円周方向の異方性を特たせることができた
ことを表している。In the figure, a solid line 101 represents a hysteresis loop of a laminated medium having Ru as an intermediate layer and having circumferential anisotropy. The broken line 102 and the dashed line 103 are respectively
This is a loop when a magnetic field H is applied in a circumferential direction and a radial direction in a laminated medium using a general Cr intermediate layer. From a comparison of these loops, it is apparent that both the remanent magnetization and the coercive force are larger in the circumferential direction than in the radial direction, and that magnetic anisotropy is provided in the circumferential direction. However, this is mainly due to the structural anisotropy in the circumferential direction applied to the lower magnetic layer, and the circumferential orientation ratio of the magnetic layer on the Cr intermediate layer is lower than that of the lower magnetic layer. It is thought that there is. The solid line is a hysteresis loop in the circumferential direction when Ru is used as the intermediate layer.
It can be seen that the coercive force is improved as compared with the case where is the intermediate layer. This indicates that the use of the Ru intermediate layer having the same crystal structure as the magnetic layer enabled the upper magnetic layer to have the same circumferential anisotropy as the lower magnetic layer. .
【００２９】実施例２ ここでは、積層媒体における各層の作製はすべてＤＣマ
グネトロンスパッタリングにより行った。Example 2 Here, all the layers in the laminated medium were manufactured by DC magnetron sputtering.
【００３０】基板として、テクスチャのない平坦なガラ
ス基板を用意した。As a substrate, a flat glass substrate having no texture was prepared.
【００３１】この基板上に、下地層としてＶを４０ｎｍ
堆積させた。On this substrate, V was set to 40 nm as an underlayer.
Deposited.
【００３２】得られた下地層上に、微量のＯ2を含んだ
Ａｒ雰囲気中でＣｏ72Ｐ20Ｃｒ8合金ターゲットのスパ
ッタリングを行い、ＣｏＰｔＣｒＯ磁性層を形成した。On the obtained underlayer, a CoPtCrO magnetic layer was formed by sputtering a Co 72 P 20 Cr 8 alloy target in an Ar atmosphere containing a small amount of O 2 .
【００３３】同様の積層を複数種作製し、各々、非磁性
中間層として、Ｒｕを、層厚を１，２，４，８，１６ｎ
ｍと変化させて形成した。A plurality of similar laminates were prepared, each having Ru as a non-magnetic intermediate layer, and having a layer thickness of 1, 2, 4, 8, 16n.
m.
【００３４】さらに、比較対象として、非磁性中間層と
して、Ｃｒを、同様にして層厚を変化させて形成した。Further, as a comparative object, a nonmagnetic intermediate layer was formed by changing the thickness of Cr in the same manner.
【００３５】得られた非磁性中間層上に、再びＣｏＰｔ
ＣｒＯ磁性層の製膜を行った。On the obtained nonmagnetic intermediate layer, CoPt was again applied.
A CrO magnetic layer was formed.
【００３６】その後、保護層として１０ｎｍのＣを積層
し、磁気記録媒体を得た。Thereafter, 10 nm of C was laminated as a protective layer to obtain a magnetic recording medium.
【００３７】得られた磁気記録媒体について、保磁力Ｈ
ｃおよび保磁力角型比Ｓ＊の中間層厚依存性を表すグラ
フ図を図３に示す。With respect to the obtained magnetic recording medium, the coercive force H
FIG. 3 is a graph showing the dependence of c and the coercive force squareness ratio S * on the thickness of the intermediate layer.
【００３８】図３中、２０１、２０２、２０３、及び２
０４は、各々、Ｒｕを中間層とした場合の保磁力Ｈｃ、
保磁力角型比Ｓ＊、Ｃｒを中間層とした場合の保磁力Ｈ
ｃ、保磁力角型比Ｓ＊を表す。In FIG. 3, 201, 202, 203, and 2
04 is a coercive force Hc when Ru is used as the intermediate layer ,
Coercive force squareness ratio S *, coercive force H when Cr is used as the intermediate layer
c, Coercivity squareness ratio S *.
【００３９】図示するように、Ｃｒを中間層とした場
合、中間層厚が５ｎｍ以下ではＨｃが大きく減少してい
るのに対し、Ｒｕを中間層とすることにより、ほとんど
中間層厚によらずＨｃが２ｋＯｅ程度と大きく改善され
ていることがわかる。また、Ｓ＊に関しては、中間層厚
が２〜１６ｎｍの範囲において、Ｒｕ中間層の方がＣｒ
中間層の場合よりも明らかに大きく、全般に改善されて
いることが分かった。このような中間層厚の薄い領域に
おける磁気特性の改善は、記録分解能を低下させないた
めの中間層の極薄膜化という要求を満たすものである。
実際、Ｒｕを中間層とした積層媒体について、磁気抵抗
効果を利用したヘッドにより電磁変換特性を評価したと
ころ、中間層厚が５ｎｍを越える媒体では明らかな記録
分解能の低下が見られた。Ｒｕ中間層厚を２〜５ｎｍと
した積層媒体は、極薄の中間層厚におけるＨｃおよびＳ
＊を改善するだけでなく、高い記録分解能を併せ持った
媒体となる。[0039] As shown, when the Cr intermediate layer, while H c in the middle layer thickness of 5nm or less are greatly reduced, by an intermediate layer of Ru, depending mostly on the thickness of the intermediate layer not H c is seen to be improved as large as about 2 kOe. Regarding S *, when the thickness of the intermediate layer is in the range of 2 to 16 nm, the Ru intermediate layer has a higher Cr content.
It was clearly larger than the case of the intermediate layer, and it was found that it was generally improved. The improvement of the magnetic properties in the region where the thickness of the intermediate layer is small satisfies the requirement of making the intermediate layer extremely thin so as not to lower the recording resolution.
Actually, when the electromagnetic conversion characteristics of a laminated medium using Ru as an intermediate layer were evaluated by a head utilizing the magnetoresistance effect, a clear decrease in recording resolution was observed in a medium having an intermediate layer thickness of more than 5 nm. Laminated medium was 2~5nm the Ru intermediate layer thickness, H c and S in the intermediate layer thickness of the ultrathin
* It is a medium that not only improves the recording quality but also has a high recording resolution.
【００４０】[0040]
【発明の効果】本発明によれば、磁性層と非磁性層とか
らなる積層型媒体において、高保磁力と高記録分解能を
両立することができる磁気記録媒体が得られる。According to the present invention, it is possible to obtain a magnetic recording medium capable of achieving both high coercive force and high recording resolution in a laminated type medium comprising a magnetic layer and a non-magnetic layer.
【図１】円周方向に異方性を持つ積層媒体における磁性
層部分の概念図FIG. 1 is a conceptual diagram of a magnetic layer portion in a laminated medium having circumferential anisotropy.
【図２】磁気記録媒体のヒステリシスループを表す図FIG. 2 is a diagram showing a hysteresis loop of a magnetic recording medium.
【図３】磁気記録媒体の静磁気特性の中間層厚依存性を
表すグラフ図FIG. 3 is a graph showing the dependence of the magnetostatic property of the magnetic recording medium on the thickness of the intermediate layer.
Claims (5)
チャを有する基板と、該基板上に形成されたコバルトを
主成分とする第１の磁性層、該第１の磁性層上に形成さ
れた六方最密構造を有する非磁性中間層、及び該非磁性
中間層上に形成されたコバルトを主成分とする第２の磁
性層を具備することを特徴とする磁気記録媒体。1. A substrate having a circumferential texture on at least one principal surface thereof, a first magnetic layer containing cobalt as a main component formed on the substrate, and formed on the first magnetic layer. A nonmagnetic intermediate layer having a hexagonal close-packed structure, and a second magnetic layer containing cobalt as a main component and formed on the nonmagnetic intermediate layer.
ム、及びオスミウムからなる群から選択される少なくと
も１種を含むことを特徴とする請求項１に記載の磁気記
録媒体。2. The magnetic recording medium according to claim 1, wherein the nonmagnetic intermediate layer contains at least one selected from the group consisting of ruthenium, rhenium, and osmium.
ことを特徴とする請求項１に記載の磁気記録媒体。3. The magnetic recording medium according to claim 1, wherein said non-magnetic intermediate layer is made of ruthenium.
金を主成分とする第１の磁性層、該第１の磁性層上に設
けられ、ルテニウム、レニウム、及びオスミウムからな
る群から選択される少なくとも１種を含み、２ないし５
ｎｍの厚さを有する非磁性中間層、及び非磁性中間層上
に設けられたコバルト白金を主成分とする第２の磁性層
を具備することを特徴とする磁気記録媒体。4. A substrate, a first magnetic layer mainly containing cobalt platinum provided on the substrate, and a first magnetic layer provided on the first magnetic layer and selected from the group consisting of ruthenium, rhenium, and osmium. 2 to 5
A magnetic recording medium comprising: a nonmagnetic intermediate layer having a thickness of nm; and a second magnetic layer mainly composed of cobalt platinum provided on the nonmagnetic intermediate layer.
ることを特徴とする請求項４に記載の磁気記録媒体。5. The magnetic recording medium according to claim 4, wherein the non-magnetic intermediate layer is made of ruthenium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11121693A JP2000311327A (en) | 1999-04-28 | 1999-04-28 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11121693A JP2000311327A (en) | 1999-04-28 | 1999-04-28 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000311327A true JP2000311327A (en) | 2000-11-07 |
Family
ID=14817551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11121693A Pending JP2000311327A (en) | 1999-04-28 | 1999-04-28 | Magnetic recording medium |
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| Country | Link |
|---|---|
| JP (1) | JP2000311327A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002045081A1 (en) * | 2000-11-29 | 2002-06-06 | Fujitsu Limited | Magnetic recording medium and magnetic storage device |
| SG101531A1 (en) * | 2001-01-05 | 2004-01-30 | Fuji Electric Co Ltd | Magnetic recording medium, method for manufacturing a magnetic recording medium and magnetic recording device |
-
1999
- 1999-04-28 JP JP11121693A patent/JP2000311327A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002045081A1 (en) * | 2000-11-29 | 2002-06-06 | Fujitsu Limited | Magnetic recording medium and magnetic storage device |
| SG101531A1 (en) * | 2001-01-05 | 2004-01-30 | Fuji Electric Co Ltd | Magnetic recording medium, method for manufacturing a magnetic recording medium and magnetic recording device |
| US6767651B2 (en) | 2001-01-05 | 2004-07-27 | Fuji Electric Co., Ltd. | Magnetic recording medium, method for manufacturing a magnetic recording medium and magnetic recording device |
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