JPH0766509B2 - Magnetic recording body and manufacturing method thereof - Google Patents
Magnetic recording body and manufacturing method thereofInfo
- Publication number
- JPH0766509B2 JPH0766509B2 JP60148612A JP14861285A JPH0766509B2 JP H0766509 B2 JPH0766509 B2 JP H0766509B2 JP 60148612 A JP60148612 A JP 60148612A JP 14861285 A JP14861285 A JP 14861285A JP H0766509 B2 JPH0766509 B2 JP H0766509B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- film
- track
- magnetic recording
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000758 substrate Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000010408 film Substances 0.000 description 13
- 239000010409 thin film Substances 0.000 description 10
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 6
- 239000010952 cobalt-chrome Substances 0.000 description 6
- 238000004544 sputter deposition Methods 0.000 description 3
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Digital Magnetic Recording (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、データを磁気的に記録する磁気記録体に関
し、特に垂直磁気記録によりデータを記録する磁気記録
体に関し、詳しくは高トラック密度で問題となるトラッ
クキング精度に係わるオフトラック特性を改善した磁気
記録体及びその製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a magnetic recording medium for magnetically recording data, and more particularly to a magnetic recording medium for recording data by perpendicular magnetic recording. The present invention relates to a magnetic recording body with improved off-track characteristics related to a problematic tracking accuracy, and a manufacturing method thereof.
（従来技術とその問題点） 磁気記録装置の記録密度の向上は斯界の変わらぬ趨勢で
ある。従来、磁気記録装置で用いられる磁気記録体は一
般に記録媒体の長手方向に磁化し記録再生を行なうが、
密度の増大とともに反磁界の影響により記録密度に限界
があり、より高密度化が可能となる記録媒体の媒体面に
垂直に磁化する垂直磁気記録方式が提案され従来の記録
密度の１桁以上の値を達成している。(Prior Art and Problems Thereof) Improvement in recording density of a magnetic recording device is a constant trend in this field. Conventionally, a magnetic recording medium used in a magnetic recording device is generally magnetized in the longitudinal direction of a recording medium to perform recording / reproduction.
There is a limit to the recording density due to the influence of the demagnetizing field as the density increases, and a perpendicular magnetic recording method is proposed in which magnetization is performed perpendicularly to the medium surface of the recording medium, which enables higher density. The value has been achieved.
ここで用いられる垂直磁気記録媒体としては、スパッタ
法，蒸着法によって形成したCoCrに代表されるCo合金薄
膜がある。このように垂直磁気記録方式においては、媒
体に垂直磁気異方性を持たせることにより記録媒体面上
の記録トラック方向の線密度を大幅に向上させることが
可能であるが、これをさらに光ディスク並に密度を向上
させるためには、トラック密度を１桁以上増大させる必
要がある。トラック密度の増大にともなって、十分なト
ラッキング精度が得られないことにより消去残りによる
ノイズの発生、また隣接トラックのトラッキングづれに
よる記録ビットからのクロストークノイズによるS/N比
（S:信号,N:雑音）の低下の問題が生じてくる。The perpendicular magnetic recording medium used here includes a Co alloy thin film typified by CoCr formed by a sputtering method or a vapor deposition method. As described above, in the perpendicular magnetic recording system, it is possible to significantly improve the linear density in the recording track direction on the surface of the recording medium by giving the medium perpendicular magnetic anisotropy. In order to improve the density, it is necessary to increase the track density by one digit or more. As the track density increases, sufficient tracking accuracy cannot be obtained, resulting in noise due to erasure residue, and S / N ratio (S: signal, N due to crosstalk noise from recorded bits due to tracking error in adjacent tracks). : Noise) decrease problem occurs.
（発明の目的） 本発明の目的は、上記問題点を解決し、基体上に形成さ
れた膜面に垂直に磁気異方性を有する磁性膜のデータト
ラックの磁性膜の垂直磁気異方性及び保磁力をデータト
ラック間のガードバンドの垂直磁気異方性及び保磁力よ
り大きくすることにより、ノイズが防止され、S/N比が
向上する磁気記録媒体およびその製造方法を提供するこ
とにある。(Objects of the Invention) An object of the present invention is to solve the above problems and to provide a perpendicular magnetic anisotropy of a magnetic film of a data track of a magnetic film having magnetic anisotropy perpendicular to a film surface formed on a substrate. To provide a magnetic recording medium in which noise is prevented and the S / N ratio is improved by making the coercive force larger than the perpendicular magnetic anisotropy and coercive force of the guard band between data tracks, and a method for manufacturing the same.
（発明の構成） 本発明は、基板上に膜面に垂直に磁気異方性を有する磁
性膜が形成された磁気記録体において、前記磁性膜のデ
ータトラックの部分の垂直磁気異方性及び保磁力が前記
磁性膜の前記データトラック間のガードバンドトラック
の部分の垂直磁気異方性及び保磁力より大きいことを特
徴とする。(Structure of the Invention) The present invention relates to a magnetic recording medium in which a magnetic film having magnetic anisotropy is formed on a substrate in a direction perpendicular to the film surface. The magnetic force is larger than the perpendicular magnetic anisotropy and the coercive force of the portion of the guard band track between the data tracks of the magnetic film.
本発明の磁気記録体の製造方法は、基体上に膜面に垂直
に磁気異方性を有する磁性膜を形成したのち、前記磁性
膜上のデータトラックの部分に光を照射して加熱するこ
とを特徴とする。According to the method of manufacturing a magnetic recording medium of the present invention, a magnetic film having magnetic anisotropy is formed on a substrate perpendicularly to the film surface, and then the data track portion on the magnetic film is irradiated with light to be heated. Is characterized by.
（実施例） 次に本発明について図面を用いて説明する。(Example) Next, this invention is demonstrated using drawing.
第１図および第２図はそれぞれ本発明の一実施例である
磁気ディスクの一部を切断して模式的に示す斜視図と製
造方法を示す斜視図である。スパッタ法等を用いて基体
４上に垂直磁気記録薄膜３を形成したのち、第２図の如
くレーザ光５を照射しつつ基体４を回転させ、基体４上
の同心円からなるデータトラック１の部分の垂直磁気記
録薄膜３を加熱する。なお、レーザー光５はレーザー照
射装置６からレンズ７を通して照射される。1 and 2 are a perspective view schematically showing a magnetic disk according to an embodiment of the present invention by cutting a part thereof and a perspective view showing a manufacturing method. After the perpendicular magnetic recording thin film 3 is formed on the substrate 4 by using the sputtering method or the like, the substrate 4 is rotated while irradiating the laser beam 5 as shown in FIG. The perpendicular magnetic recording thin film 3 is heated. The laser light 5 is emitted from the laser irradiation device 6 through the lens 7.
レーザ光５により加熱された垂直磁気記録薄膜３のデー
タトラック１の部分の垂直磁気異方性が増大しかつ保磁
力も増大する。その結果、データトラック１における記
録再生特性は、データトラック１間のガードバンドトラ
ック２上より高密度記録が可能となりかつ高出力が得ら
れ、高記録密度領域においてはトラッキング偏倚により
生ずるガードバンドトラック２への記録の出力はデータ
トラック１からの出力に較べて十分小さく出来、また隣
接トラックでのトラッキング偏倚によるクロスストーク
等も抑制することが出来、S/Nの大きい信号が得られ
る。The perpendicular magnetic anisotropy of the portion of the data track 1 of the perpendicular magnetic recording thin film 3 heated by the laser beam 5 increases and the coercive force also increases. As a result, the recording / reproducing characteristics of the data track 1 enable higher density recording and higher output than the guard band track 2 between the data tracks 1, and the guard band track 2 generated by the tracking deviation in the high recording density area. The recording output can be made sufficiently smaller than the output from the data track 1, and crosstalk or the like due to tracking deviation in adjacent tracks can be suppressed, and a signal with a large S / N can be obtained.
第１図に示す実施例では基体４としてアルマイト被覆ア
ルミ合金基板を用い、基体４上にスパッタ法によりCoCr
合金ターゲットを用いてスパッタリングにより膜厚0.3
μｍのCoCr薄膜からなる垂直磁気記録薄膜３を形成し
た。このCoCr薄膜の垂直磁気異方性磁界Hkは2.0KOeで、
保磁力Hc⊥が300Oe,飽和磁化Msは300emu/ccとした。In the embodiment shown in FIG. 1, an alumite-coated aluminum alloy substrate is used as the base 4, and CoCr is sputtered on the base 4.
Film thickness of 0.3 by sputtering with alloy target
A perpendicular magnetic recording thin film 3 consisting of a CoCr thin film of μm was formed. The perpendicular magnetic anisotropy field Hk of this CoCr thin film is 2.0KOe,
The coercive force Hc⊥ was 300 Oe and the saturation magnetization Ms was 300 emu / cc.
第２図に示す製造方法の実施例では、レーザー照射装置
６としてCO2レーザーを用いてデータトラック１を照射
し加熱した。同一条件で処理した試料の垂直磁気異方性
磁界Hkは5.0KOeで保磁力Hc⊥は800Oeとなった。In the example of the manufacturing method shown in FIG. 2, a CO 2 laser was used as the laser irradiation device 6 to irradiate and heat the data track 1. The perpendicular magnetic anisotropy field Hk of the sample treated under the same conditions was 5.0 KOe and the coercive force Hc⊥ was 800 Oe.
効果を確認するために、第１図に示す実施例のデータト
ラック１をガードバンドトラック２の記録密度特性をギ
ャップ長0.25μｍのリング型磁気ヘッド（Mn−Zn）を用
いてスペーシング0.05μｍで測定した。その結果を第３
図に示す（曲線10がデータトラック1,曲線11がガードバ
ンドトラック２の特性を示す）。データトラック１上で
は弧立波出力の1/2となる出力の記録密度D50は140KFRPI
であり、一方ガードバンドトラック２上では弧立波出力
の1/2となる出力の記録密度D50は60KFRPIであった。さ
らに出力はデータトラック１上ではガードバンドトラッ
ク２上よりほぼ1.7倍大きかった。したがってデータト
ラック１でほぼ60KFRPI以上の記録密度ではガードバン
ドトラック２からの再生出力はデータトラック１の出力
に較べて十分小さく良好なオフトラック特性を得ること
が出来た。In order to confirm the effect, the recording density characteristics of the data track 1 of the embodiment shown in FIG. 1 and the guard band track 2 were measured with a ring type magnetic head (Mn-Zn) having a gap length of 0.25 μm and a spacing of 0.05 μm. It was measured. The result is the third
Shown in the figure (curve 10 shows the characteristics of data track 1 and curve 11 shows the characteristics of guard band track 2). On the data track 1, the recording density D 50 of the output which is 1/2 of the arc standing wave output is 140 KFRPI.
On the other hand, on the guard band track 2, the recording density D 50 of the output which is 1/2 of the arc standing wave output was 60 KFRPI. Further, the output was approximately 1.7 times larger on the data track 1 than on the guard band track 2. Therefore, at a recording density of approximately 60 KFRPI or more in the data track 1, the reproduction output from the guard band track 2 was sufficiently smaller than the output of the data track 1 and good off-track characteristics could be obtained.
なお第１図に示す実施例においてCoCr単層膜の例を示し
たが、CoCr薄膜の下地薄膜としてNiFe等を用いる２層膜
に本発明を適用してもよい。Although the example of the CoCr single layer film is shown in the embodiment shown in FIG. 1, the present invention may be applied to a two-layer film using NiFe or the like as the underlying thin film of the CoCr thin film.
（発明の効果） 以上述べた如く本発明は、磁気記録体におけるデータト
ラックの磁性膜の垂直磁気異方性をデータトラック間の
ガードバンドトラックの垂直磁気異方性より大きくする
ことにより、データトラックの使用記録密度ではたとえ
トラックキング偏倚によりガードバンドにデータが記録
されても再生出力は十分に小さく、また隣接トラックか
らのクロストークも抑制することが出来る効果がある。As described above, according to the present invention, the perpendicular magnetic anisotropy of the magnetic film of the data track in the magnetic recording medium is made larger than the perpendicular magnetic anisotropy of the guard band track between the data tracks, so that the data track With the used recording density, even if data is recorded in the guard band due to the track king deviation, the reproduction output is sufficiently small and the crosstalk from the adjacent tracks can be suppressed.
さらに本発明は、磁気記録媒体側でデータトラックを規
定することによりセクターサーボ等を用いる場合にもト
ラッキング精度を向上させサーボマージンを大幅に向上
させることが出来る。Further, according to the present invention, by defining the data track on the magnetic recording medium side, the tracking accuracy can be improved and the servo margin can be greatly improved even when sector servo or the like is used.
第１図および第２図はそれぞれ本発明の一実施例の一部
を示す斜視図およびその製造方法を示す斜視図、第３図
は第１図に示す実施例のデータトラック１とガードバン
ドトラック２の記録特性を示すグラフである。 １……データトラック、２……ガードバンド、３……垂
直磁気記録薄膜、４……基体、５……レーザ光、６……
レーザ照射装置、７……レンズ。1 and 2 are a perspective view showing a part of an embodiment of the present invention and a perspective view showing a manufacturing method thereof, and FIG. 3 is a data track 1 and a guard band track of the embodiment shown in FIG. 6 is a graph showing the recording characteristics of No. 2. 1 ... Data track, 2 ... Guard band, 3 ... Perpendicular magnetic recording thin film, 4 ... Substrate, 5 ... Laser beam, 6 ...
Laser irradiation device, 7 ... Lens.
Claims (2)
磁性膜が形成された磁気記録体において、前記磁性膜の
データトラックの部分の垂直磁気異方性及び保磁力が前
記磁性膜の前記データトラック間のガードバンドトラッ
クの部分の垂直磁気異方性及び保磁力より大きいことを
特徴とする磁気記録体。1. In a magnetic recording body having a magnetic film having a magnetic anisotropy perpendicular to the film surface formed on a substrate, the perpendicular magnetic anisotropy and the coercive force of the data track portion of the magnetic film have the magnetic property. A perpendicular magnetic anisotropy and a coercive force in a portion of a guard band track between the data tracks of the film, which is larger than the magnetic recording medium.
磁性膜を形成したのち、前記磁性膜上のデータトラック
の部分に光を照射して加熱することを特徴とする磁気記
録体の製造方法。2. A magnetic recording method comprising: forming a magnetic film having magnetic anisotropy perpendicular to a film surface on a substrate; and irradiating light to a data track portion on the magnetic film to heat the portion. Body manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148612A JPH0766509B2 (en) | 1985-07-05 | 1985-07-05 | Magnetic recording body and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148612A JPH0766509B2 (en) | 1985-07-05 | 1985-07-05 | Magnetic recording body and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS629517A JPS629517A (en) | 1987-01-17 |
| JPH0766509B2 true JPH0766509B2 (en) | 1995-07-19 |
Family
ID=15456674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60148612A Expired - Lifetime JPH0766509B2 (en) | 1985-07-05 | 1985-07-05 | Magnetic recording body and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0766509B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2769420B2 (en) * | 1992-05-01 | 1998-06-25 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Magnetic moment lowering method and data storage device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58118029A (en) * | 1982-01-05 | 1983-07-13 | Fuji Xerox Co Ltd | Double-sided recording medium for vertical magnetic recording |
-
1985
- 1985-07-05 JP JP60148612A patent/JPH0766509B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS629517A (en) | 1987-01-17 |
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