JPH01185817A - Superconducting perpendicular magnetic recording medium - Google Patents
Superconducting perpendicular magnetic recording mediumInfo
- Publication number
- JPH01185817A JPH01185817A JP63009983A JP998388A JPH01185817A JP H01185817 A JPH01185817 A JP H01185817A JP 63009983 A JP63009983 A JP 63009983A JP 998388 A JP998388 A JP 998388A JP H01185817 A JPH01185817 A JP H01185817A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic
- magnetic recording
- superconducting
- magnetic domains
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 48
- 230000005381 magnetic domain Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000006247 magnetic powder Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 239000013078 crystal Substances 0.000 abstract description 5
- 230000005347 demagnetization Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000010408 film Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 241001275944 Misgurnus anguillicaudatus Species 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は垂直磁気記録に使用される記録媒体に係り、特
に、記録再生出力の高い垂直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 recording medium used for perpendicular magnetic recording, and particularly to a perpendicular magnetic recording medium with high recording and reproducing output.
（従来技術と解決すべき課題）
近年、垂直磁気記録は高密度記録に適した方法として広
く研究が進められている。(Prior Art and Problems to be Solved) In recent years, perpendicular magnetic recording has been widely studied as a method suitable for high-density recording.
垂直磁気記録媒体は、膜面に対して垂直な方向に磁気異
方性を有する様に構成されるが、その形成方法としては
、スパッタリング、蒸着等の薄膜形成手段により垂直磁
気異方性膜を磁気テープやディスク等の基体に形成する
方法、バインダの中に磁性粉を混入し基体に垂直方向の
配向磁場をかけ塗布する方法、メツキによる方法が知ら
れている。Perpendicular magnetic recording media are constructed to have magnetic anisotropy in the direction perpendicular to the film surface, and the method for forming them is to form a perpendicular magnetic anisotropic film by thin film forming means such as sputtering or vapor deposition. Known methods include forming it on a substrate such as a magnetic tape or disk, mixing magnetic powder into a binder and coating the substrate by applying an orienting magnetic field in a perpendicular direction, and plating.
しかし、上記方法によって得られるどの媒体にも次に述
べる特性が指摘されている。However, the following characteristics have been pointed out in any medium obtained by the above method.
第４図は従来の垂直磁気記録媒体における記録波長λが
短い場合（同図（ａ））の記録媒体の磁化状態（同図（
ｂ））と再生出力（同図（Ｃ））との関係を示す説明図
、第５図は従来の垂直磁気記録媒体における記録波長＾
が長い場合（同図（ａ））の記録媒体の磁化状態（同図
（ｂ））と再生出力（同図（Ｃ））を示す図である。Figure 4 shows the magnetization state of a conventional perpendicular magnetic recording medium when the recording wavelength λ is short ((a) in the same figure).
Fig. 5 is an explanatory diagram showing the relationship between b)) and reproduction output ((C) in the same figure), and Fig. 5 shows the recording wavelength in a conventional perpendicular magnetic recording medium.
FIG. 4 is a diagram showing the magnetization state of the recording medium (FIG. 2(B)) and the reproduction output (FIG. 3(C)) when the distance is long (FIG. 2(A)).
第４図（ａ）に示す様に方形波信号１０の記録波−長λ
が短い場合、同図（ｂ）に示す様に、これらの信号によ
って形成された磁区１１同志による減磁作用は大とはな
らず、再生に際しては、同図（ｃ）に示す様に、再生磁
気ヘッドからの再生波形１２はそれ程変化しない、尚、
磁区１１の矢印は磁区１１の磁化方向を示し、その長さ
は磁化の大きさを示すベクトルである。As shown in FIG. 4(a), the recording wave length λ of the square wave signal 10 is
is short, as shown in the figure (b), the demagnetizing effect of the magnetic domains 11 formed by these signals is not large, and during reproduction, as shown in the figure (c), the demagnetization effect is not large. The reproduced waveform 12 from the magnetic head does not change much;
The arrow of the magnetic domain 11 indicates the magnetization direction of the magnetic domain 11, and its length is a vector indicating the magnitude of magnetization.
しかるに、第５図（ａ）に示す様に、方形波信号１３の
記録波長λか大きくなると同図（ｂ）に示す様に、この
信号によって形成された磁区２扛→、同志の影響によっ
て減磁作用は大となり、再生に際し、再生磁気ヘッドに
よる同一方向へ磁化された磁区１４による再生出力１５
は低下し、再生波形も大きく変化するという問題点があ
った。However, as shown in FIG. 5(a), as the recording wavelength λ of the square wave signal 13 increases, as shown in FIG. The magnetic effect becomes large, and during reproduction, the reproduction output 15 due to the magnetic domains 14 magnetized in the same direction by the reproduction magnetic head
There was a problem that the reproduction waveform decreased and the reproduced waveform changed significantly.
特に、誘電型のみならず、磁束応答型の磁気ヘッドにつ
いても同様の傾向が見られた。In particular, a similar tendency was observed not only for dielectric type magnetic heads but also for magnetic flux response type magnetic heads.
（課題を解決するための手段）
本発明は上記課題を解決するためになされたものであり
、強磁性体からなる磁区を膜面に対して垂直方向に磁化
する垂直磁気記録媒体において、前記磁区間を超伝導物
質によって満たしたことを特徴とする超伝導磁気記録媒
体を提供しようとするらのである。(Means for Solving the Problems) The present invention has been made to solve the above problems, and provides a perpendicular magnetic recording medium in which magnetic domains made of ferromagnetic material are magnetized in a direction perpendicular to the film surface. The present invention aims to provide a superconducting magnetic recording medium characterized in that the sections are filled with a superconducting material.
（実 施 例）
第１図は本発明になる第１実施例の超伝導磁気記録媒体
２０を示す断面図である。(Embodiment) FIG. 1 is a sectional view showing a superconducting magnetic recording medium 20 of a first embodiment of the present invention.
同図において、２１はテープ、ディスク等からなる基体
であり、２２は基体２１面上に初期層として形成したア
モルファスの微結晶である。In the figure, 21 is a base made of a tape, a disk, etc., and 22 is an amorphous microcrystal formed as an initial layer on the surface of the base 21.
２３はＣｏＣｒＮｂ柱状結晶からなる、単磁区であり、
初期層２２の上方に接する様に形成され、各単磁区２３
間が、例えばＹ、Ｂａ、Ｃｕ、０系等の常温超伝導物質
２４で埋められる如く構成されている。23 is a single magnetic domain consisting of CoCrNb columnar crystals,
Each single magnetic domain 23 is formed so as to be in contact with the upper part of the initial layer 22.
The gap is filled with a room-temperature superconducting material 24 such as Y, Ba, Cu, or 0-based material.
第２図は本発明になる垂直磁気記録媒体にお（づる方形
波信号の記録波長が長い場合（同図（ａ））の記録媒体
の磁化状態（同図（ｂ））と再生出力（同図（Ｃ））を
示す説明図であり、以下同図を用ゝ゛て作用及び効果を
説明する・ ２５−第２図＜ａ）に示す様に方形波信
号女埠の記録波長λが長い場合でも、記録に際して、方
形波信号２５によって形成された各磁区２３は、同図（
ｂ）に示す様に、超伝導物質２４によって取りまかれる
如く形成されているから、もし、これらの超伝導物質２
４が超伝導状態におかれるとマイスナー効果のために磁
束を通さなくなるから隣接する磁区２３同志は互に影響
を受けにくくなり、減磁作用が小さくなる。再生に際し
て、各磁区２３は減磁を受けないため、再生出力２６は
大となり、再生波形も元の波形に対してあまり変化しな
い、特に磁束応答型の磁気ヘッドを用いた場合その効果
は著しい。Figure 2 shows the magnetization state of the recording medium (Fig. 2(b)) and the reproduction output (Fig. This is an explanatory diagram showing Figure (C)), and the function and effect will be explained below using the same diagram. 25-When the recording wavelength λ of the square wave signal is long as shown in Figure 2<a) However, during recording, each magnetic domain 23 formed by the square wave signal 25 is
As shown in b), since it is formed so as to be surrounded by superconducting materials 24, if these superconducting materials 2
4 is in a superconducting state, no magnetic flux passes through it due to the Meissner effect, so adjacent magnetic domains 23 become less susceptible to each other, and the demagnetization effect becomes smaller. During reproduction, each magnetic domain 23 is not demagnetized, so the reproduction output 26 is large, and the reproduced waveform does not change much from the original waveform.This effect is particularly remarkable when a flux-responsive magnetic head is used.
第３図は本発明になる第２実施例の超伝導磁気記録媒体
３０を示す斜視図である。FIG. 3 is a perspective view showing a superconducting magnetic recording medium 30 according to a second embodiment of the present invention.
同図において３１は、例えば、テープ、ディスク等から
なる基体であり、３２は基体上に塗布した塗布剤である
。In the figure, 31 is a base made of, for example, a tape or a disk, and 32 is a coating agent applied onto the base.
塗布剤３２は、Ｂａフェライト六角柱状の結晶３３と、
Ｙ、Ｂａ、Ｃｕ、Ｏ系等の常温超伝導体（図示せず）と
をバインダ３４の中に混在させたものであり、前記柱状
結晶３３の磁化容易軸は基体３１面に対して垂直となる
ように配向されいてる。The coating agent 32 includes Ba ferrite hexagonal columnar crystals 33;
A room-temperature superconductor (not shown) such as Y, Ba, Cu, or O type is mixed in the binder 34, and the axis of easy magnetization of the columnar crystal 33 is perpendicular to the plane of the base 31. It is oriented so that
第２実施例の作用効果は、前記第１実施例のものに時間
−と考えられるため説明は省略する。The effects of the second embodiment are considered to be time-dependent compared to those of the first embodiment, and therefore their explanation will be omitted.
（発明の効果）
本発明になる超伝導磁気記録媒体によれば、強磁性体か
らなる磁区を膜面に対して垂直方向に磁化する垂直磁気
記録媒体において、前記磁区間を超伝導物質によって満
たしたことを特徴とする超伝導磁気記録媒体によって満
す様に構成したため、各磁区は隣接する磁区からの減磁
作用を受けにくく、その結果、再生出力は低下せず、特
に記録波長が長い方形波信号の場合でも良好な再生出力
と波形を得ることが出来る。(Effects of the Invention) According to the superconducting magnetic recording medium of the present invention, in a perpendicular magnetic recording medium in which a magnetic domain made of a ferromagnetic material is magnetized in a direction perpendicular to the film surface, the magnetic domain is filled with a superconducting material. As a result, each magnetic domain is less susceptible to demagnetizing effects from adjacent magnetic domains, and as a result, the reproduction output does not decrease, especially in the case of a rectangular recording medium with a long recording wavelength. Even in the case of wave signals, good reproduction output and waveforms can be obtained.
特に、磁束応答型の再生磁気ヘッドを使用した場合その
効果は顕著となる。This effect is particularly noticeable when a magnetic flux response type reproducing magnetic head is used.
第１図は本発明になる第１実施例の超伝導磁気に記録媒
体を示す断面図、第２図は本発明になる垂直磁気記録媒
体における方形波信号の記ｊｊ！波長が長い場合（同図
（ａ））の記録媒体の磁化状態（同図（ｂ））と再生出
力（同図（ｃ））、第３図は本発明になる第２実施例の
超伝導磁気記録媒体を示す斜視図、第４図は従来の垂直
磁気記録媒体における記録波長λが短い場合（同図（ａ
））の記録媒体の磁化状態（同図（ｂ））と再生出力（
同図（Ｃ））との関係を示す説明図、第５図は従来の垂
直磁気記録媒体における記録波長λが長い場合（同図（
ａ））の記録媒体の磁化状Ｂ（同図（ｂ））と再生出力
（同図（Ｃ））を示ず説明図である。
２０．３０・・・超伝導磁気記録媒体、２１．３１・・
・基体、２２・・・初期層、２３・・・磁区、２４・・
・常温超伝導物質、３２・・・塗布剤、３３・・・Ｂａ
フェライト六角柱状の結晶、３４・・・バインダ。
手続補正音
平成元年４月ｌＯ日
昭和０３年特許願第９９８３号
２、発明の名称
超伝導垂直磁気記録媒体
３、補正をする老
事件との関係 １２＋ Ｓ′ｌ出願人住所 神奈用県
横浜１１神奈川区守屋町３丁口１２番地自発補正
５、補正の対争
明Ｉｌｌ民の発明の名称の欄、１３訂品求の範囲の欄、
発明の詳細な説明の欄及び図面のｌ！ｔＩｉな説明の摺
６、補正の内容
（１）明細用の発明の名称を［！ｒ！直磁気記録媒体１
と補正する。
（２、特許請求の範囲を別紙のように補正する。１（Ｊ
明細内の第４頁第１行及び同頁第４行乃至第５行、第５
頁第１２行乃至第１３行、第６頁第６４５ 。
第７頁第３行乃至第４行及び同貞第１２行の［超伝導磁
気記録媒体」を［垂直磁気記録媒体、１と補正する。
（４）明細用の第６頁第９行乃至第１０行の「ｉ！１だ
したことを特徴とする超伝導磁気記録媒体によって」を
削除する。
（＋５）明細用の第６頁第１８行乃至第１９行の［超伝
導磁気に記録媒体］を「垂直磁気記録媒体」と補正する
。
特許請求の範囲
（１）強磁性体からなる磁区を膜面に対して垂直方向に
磁化する垂直磁気記録媒体において、重犯磁区間を超伝
導物質によって満したことを特徴とする郵１藍久亙１舅
１゜
■バインダ中に磁性粉としてＢａフエライｌ−粒子を含
む塗布型垂直磁気記録媒体において、前記バインダ中に
更に、Ｙ、Ｂａ、Ｃｕ、０系の超伝導物質を混在させた
ことを特徴とする１σ亘ｌＬＷ里婁・FIG. 1 is a sectional view showing a superconducting magnetic recording medium according to a first embodiment of the present invention, and FIG. 2 is a diagram of a square wave signal in a perpendicular magnetic recording medium according to the present invention. When the wavelength is long ((a) in the same figure), the magnetization state of the recording medium ((b) in the same figure) and the reproduction output ((c) in the same figure), and Figure 3 shows the superconductivity of the second embodiment of the present invention. FIG. 4 is a perspective view showing a magnetic recording medium when the recording wavelength λ is short in a conventional perpendicular magnetic recording medium ((a)
)) magnetization state of the recording medium ((b) in the same figure) and reproduction output (
FIG. 5 is an explanatory diagram showing the relationship with the conventional perpendicular magnetic recording medium when the recording wavelength λ is long ((C) in the same figure).
It is an explanatory diagram without showing the magnetization state B ((b) of the same figure) and the reproduction output ((C) of the same figure) of the recording medium of (a)). 20.30...Superconducting magnetic recording medium, 21.31...
- Substrate, 22... Initial layer, 23... Magnetic domain, 24...
・Room temperature superconducting material, 32... Coating agent, 33... Ba
Ferrite hexagonal columnar crystal, 34...Binder. Procedural amendment sound April 1, 1989, 1989, Patent Application No. 9983, 2, Name of invention: Superconducting perpendicular magnetic recording medium 3, Relationship with old case to be amended: 12+ S'l Applicant's address: Yokohama, Kannayo Prefecture 11 12-12 Moriyamachi 3-chome, Kanagawa-ku Voluntary amendment 5, column for the name of the invention of the person who is the subject of the amendment, column 13 for the scope of the amendment request,
Detailed Description of the Invention and Drawings l! tIi Explanation 6, Contents of amendment (1) Name of invention for specification [! r! Direct magnetic recording medium 1
and correct it. (2. Amend the claims as shown in the attached sheet. 1 (J
Line 1 of page 4 in the specification and lines 4 to 5 of the same page, line 5
Page lines 12-13, page 6, page 645. [Superconducting magnetic recording medium] in lines 3 and 4 of page 7 and line 12 of Dojo is corrected to [perpendicular magnetic recording medium, 1]. (4) Delete ``By means of a superconducting magnetic recording medium characterized by outputting i!1'' in lines 9 and 10 of page 6 for the specification. (+5) [Superconducting magnetic recording medium] on page 6, lines 18 to 19 for the specification is corrected to "perpendicular magnetic recording medium." Claims (1) A perpendicular magnetic recording medium in which a magnetic domain made of a ferromagnetic material is magnetized in a direction perpendicular to the film surface, characterized in that a serious magnetic section is filled with a superconducting material. 1゜1゜■ In a coated perpendicular magnetic recording medium containing Ba ferrite particles as magnetic powder in a binder, a Y, Ba, Cu, and 0-based superconducting material is further mixed in the binder. Characteristics of 1σ Wataru LW Rirou・
Claims (2)
磁化する垂直磁気記録媒体において、前記磁区間を超伝
導物質によって満たしたことを特徴とする超伝導磁気記
録媒体。(1) A superconducting magnetic recording medium in which a magnetic domain made of a ferromagnetic material is magnetized in a direction perpendicular to the film surface, characterized in that the magnetic interval is filled with a superconducting material.
含む塗布型垂直磁気記録媒体において、前記バイタンダ
中に更に、Ｙ、Ｂａ、Ｃｕ、Ｏ系の超伝導物質を混在さ
せたことを特徴とする超伝導垂直磁気記録媒体。(2) A coated perpendicular magnetic recording medium containing Ba ferrite particles as magnetic powder in a binder, characterized in that a Y, Ba, Cu, and O-based superconducting material is further mixed in the bitander. Conduction perpendicular magnetic recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63009983A JPH01185817A (en) | 1988-01-20 | 1988-01-20 | Superconducting perpendicular magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63009983A JPH01185817A (en) | 1988-01-20 | 1988-01-20 | Superconducting perpendicular magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01185817A true JPH01185817A (en) | 1989-07-25 |
Family
ID=11735130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63009983A Pending JPH01185817A (en) | 1988-01-20 | 1988-01-20 | Superconducting perpendicular magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01185817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5679473A (en) * | 1993-04-01 | 1997-10-21 | Asahi Komag Co., Ltd. | Magnetic recording medium and method for its production |
-
1988
- 1988-01-20 JP JP63009983A patent/JPH01185817A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5679473A (en) * | 1993-04-01 | 1997-10-21 | Asahi Komag Co., Ltd. | Magnetic recording medium and method for its production |
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