JPS6166219A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS6166219A JPS6166219A JP18813084A JP18813084A JPS6166219A JP S6166219 A JPS6166219 A JP S6166219A JP 18813084 A JP18813084 A JP 18813084A JP 18813084 A JP18813084 A JP 18813084A JP S6166219 A JPS6166219 A JP S6166219A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetic recording
- longitudinal direction
- recording medium
- ratio
- 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
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- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は高密度磁気記録に適する磁気記録媒体に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording medium suitable for high-density magnetic recording.
(従来例の構成とその問題点)
近年の磁気記録の高密度化の進歩は著しく、従来の延長
線上にはもはやこれ以上の高密度化を望むことは困難な
状況になっている。従って、c。(Structure of conventional example and its problems) The progress in increasing the density of magnetic recording has been remarkable in recent years, and it is no longer possible to hope for higher densities as an extension of conventional methods. Therefore, c.
を吸着させたr−Fs203微粒子とバインダを主成分
とする磁気記録層から、バインダをもたずかつ酸化物磁
性体の飽和磁束密度の低さを解消する強磁性金属薄膜を
磁気記録層とする磁気記録媒体への転換が期待されてい
る。From a magnetic recording layer mainly composed of r-Fs203 particles adsorbed with a binder, a ferromagnetic metal thin film that does not have a binder and eliminates the low saturation magnetic flux density of oxide magnetic material is used as a magnetic recording layer. A shift to magnetic recording media is expected.
強磁性金属薄膜型磁気記録媒体は第1図に示すように1
高分子基板1上に強磁性金属薄膜2を配し、実用性能を
向上させるために、保護層3と、バックコート層4を配
したものが一般的である。The ferromagnetic metal thin film type magnetic recording medium has 1 as shown in Figure 1.
Generally, a ferromagnetic metal thin film 2 is disposed on a polymer substrate 1, and a protective layer 3 and a back coat layer 4 are disposed in order to improve practical performance.
最近磁化容易軸が膜面に垂直な場合、強磁性金属薄膜と
高分子基板の中間に軟磁性層を配し、記録再生特性を改
良したものが知られているが、磁化容易軸の方向罠無関
係に、−軸異方性の良好な薄膜が磁気記録に適している
と考えられ、製法上も工夫をこらして、保磁力の大きな
、磁化特性の角形性の良好な薄膜を形成する努力がなさ
れている。Recently, it is known that when the easy axis of magnetization is perpendicular to the film surface, a soft magnetic layer is placed between the ferromagnetic metal thin film and the polymer substrate to improve the recording and reproducing characteristics. Regardless, thin films with good -axis anisotropy are thought to be suitable for magnetic recording, and efforts are being made to form thin films with large coercive force and good squareness of magnetization characteristics by devising manufacturing methods. being done.
現状ではリング型磁気ヘッドで長手記録媒体による記録
再生が信号対雑音比(S$)からみて、最もすぐれてい
るが、長手記録では、記録波長を短かくしていくと、損
失が大きくなり、S/Nが確保できなくなるので、面積
記録密度を大きくするためにトラック幅を狭くするのが
得策である。Currently, recording and reproducing using a longitudinal recording medium using a ring-type magnetic head is the best in terms of signal-to-noise ratio (S$), but in longitudinal recording, as the recording wavelength becomes shorter, the loss increases and the S/ Since N cannot be secured, it is advisable to narrow the track width in order to increase the areal recording density.
しかし−軸異方性の良好な膜で保磁力を800 (6e
)から1600(Os)までの範囲で変化させて、記
録再生すると、Sハとしては必ずしも満足できないこと
が明らかになった。However, a film with good -axis anisotropy has a coercive force of 800 (6e
) to 1600 (Os) and recorded and reproduced, it became clear that S was not necessarily satisfactory.
(発明の目的)
本発明の目的は、従来の欠点を解消し、狭トラツク記録
再生でのS/Nの改良された磁気記録媒体を提供するこ
とである。(Objective of the Invention) An object of the present invention is to eliminate the conventional drawbacks and provide a magnetic recording medium with an improved S/N ratio in narrow track recording and reproduction.
(発明の構成)
本発明の磁気記録媒体は、強磁性薄膜の保磁力の長手方
向の値と′、長手と直交方向の値の比が1.8から3,
0の範囲にあるものである0(実施例の説明)
本発明の一実施例を第2図に基づいて説明する。(Structure of the Invention) The magnetic recording medium of the present invention is characterized in that the ratio of the coercive force of the ferromagnetic thin film in the longitudinal direction and the value in the direction perpendicular to the longitudinal direction is from 1.8 to 3.
0 (Explanation of Embodiment) An embodiment of the present invention will be described based on FIG. 2.
同図はV、S、M、で測定したヒステリシス曲線の一例
で、He(IJが長手方向の保磁力、H(2)が長手と
直交方向の保磁力で、本発明の磁気記録層は1.8≦H
e(1)/ He(2)≦3.0の関係を満足する構成
であればよく、材質には無関係である0
本発明の磁気記録媒体は、基本的に高密度記録を目指す
ものであるからHe(1)/ He(2)の関係が上記
の範囲であれば、全て良いということはないのは当然で
、公知のようにHe(1)が500(Oe)で、たとえ
ば0.7μmを十分なSハで再生できないことは明らか
で、7(10(Os)から800(5e)のHe(1)
は最低限確保しないと1μm以下での記録波長で45d
B以上のS/Nをトラック幅20μmで確保できないの
で、He(1)は必要な大きさを確保した前提で本発明
は構成されるものである。The figure shows an example of a hysteresis curve measured at V, S, and M, where He (IJ is the coercive force in the longitudinal direction, H (2) is the coercive force in the direction perpendicular to the longitudinal direction, and the magnetic recording layer of the present invention is 1 .8≦H
Any configuration is sufficient as long as it satisfies the relationship e(1)/He(2)≦3.0, and is unrelated to the material.0 The magnetic recording medium of the present invention basically aims at high-density recording. Therefore, if the relationship between He(1)/He(2) is within the above range, it is natural that not everything is good. It is clear that it cannot be reproduced with sufficient S Ha, and He (1) of 7 (10 (Os) to 800 (5e)
is 45d at a recording wavelength of 1μm or less unless the minimum is ensured.
Since it is not possible to secure an S/N of B or higher with a track width of 20 μm, the present invention is constructed on the premise that He(1) has the necessary size.
He(1)/ He(2)の臨界的意義については、い
の目標を45 dB以上とし、記録波長0.75μm、
)ラック幅9μmが実現できる磁気記録システムが超小
型ビデオシステムを可能にする数値目標として評価した
ときに生じた限定である。Regarding the critical significance of He(1)/He(2), we set a target of 45 dB or more, a recording wavelength of 0.75 μm,
) This is a limitation that arose when a magnetic recording system that could realize a rack width of 9 μm was evaluated as a numerical goal that would enable an ultra-compact video system.
1.8以下になると長手と直交方向の磁気的擾乱が、雑
音となり無視できなくなり、3.0以上だと一軸異方性
が強くなり、磁化遷移領域の、のこぎυ歯状の乱れが、
雑音成分として大きくなるため、臨界が生じていると考
えられるものである。When it is less than 1.8, the magnetic disturbance in the direction orthogonal to the longitudinal direction becomes noise and cannot be ignored, and when it is more than 3.0, the uniaxial anisotropy becomes strong, and the sawtooth-like disturbance in the magnetization transition region becomes
Since the noise component becomes large, it is thought that criticality has occurred.
本発明に用いることのできる磁気記録層は、Co。The magnetic recording layer that can be used in the present invention is Co.
Co−Ni 、 Co−F@ 、、 Co−Tl
、 Co−Cr 、 Co−Mn 。Co-Ni, Co-F@,, Co-Tl
, Co-Cr, Co-Mn.
Co −Mg 、 Co −Ru 、 Co−V
、 Co −Mo 、 Co −Nt −P 。Co-Mg, Co-Ru, Co-V
, Co-Mo, Co-Nt-P.
Co−N1−Zn−P 等およびそれらの部分酸化膜な
どで、電子ビーム蒸着法、イオンシレーティフグ法、ス
パッタリング法、無電解メッキ法等で得られるものであ
る。Co--N1-Zn-P, etc., and partially oxidized films thereof, which can be obtained by electron beam evaporation, ion silage blowing, sputtering, electroless plating, etc.
さらに具体的に一実施例について説明する。An example will be described in more detail.
厚さ10.5μmのポリエチレンテレフタレートフィル
ム上に、直径約1901の5in2粒子をポリエステル
樹脂で固定した。樹脂の実効厚さは70Xとした。81
02粒子は1μm X l l1mに平均6個とした。5in2 particles with a diameter of about 1901 were fixed with polyester resin on a polyethylene terephthalate film with a thickness of 10.5 μm. The effective thickness of the resin was 70X. 81
The average number of 02 particles was 6 per 1 μm x 1 m.
この基板を用い、直径1.2 mの円筒状キャンに沿わ
せて連結入射角変化蒸着法でCo−N1 (Nl 20
wt% )を4X10−5Torrの酸素中で電子ヒー
ム蒸着を行なった。電子ビームの集束状態と走査波形と
最小入射角の調整によりHe(1)とHe (2)の各
種の値のものを準備した。Using this substrate, Co-N1 (Nl 20
wt%) was subjected to electron beam evaporation in oxygen at 4×10 −5 Torr. Various values of He(1) and He(2) were prepared by adjusting the focusing state of the electron beam, the scanning waveform, and the minimum incident angle.
磁気記録層の厚さは0.15μm一定とし、得られた磁
気テープのS/NをCO系非晶質合金リング型磁気ヘッ
ド(ギャップ長0.25μm)による記録再生で測定し
た。The thickness of the magnetic recording layer was kept constant at 0.15 μm, and the S/N of the obtained magnetic tape was measured by recording and reproducing using a CO-based amorphous alloy ring-type magnetic head (gap length 0.25 μm).
記録波長は0.75μm、)ラック幅は9μmとした。The recording wavelength was 0.75 μm, and the rack width was 9 μm.
得られた媒体条件とS/Nを表に示す。The obtained medium conditions and S/N are shown in the table.
表よシ、本発明の強磁性薄膜の要件であるHc (1)
/ He(2)が1.8から3.0までの範囲では狭ト
ラツク、短波長による高密度記録でも45dB以上のS
ハが確保できることがわかる。Table 1. Hc (1), which is a requirement for the ferromagnetic thin film of the present invention.
/ In the He(2) range of 1.8 to 3.0, even narrow tracks and high-density recording with short wavelengths can achieve S of 45 dB or more.
It can be seen that Ha can be secured.
表
(発明の効果)
本発明によれば、磁気記録媒体休の長手方向の保磁力と
、長手と直交する方向の保磁力の比を1.8から3.0
の範囲にとった強磁性薄膜を磁気記録層とすることで、
リング型磁気ヘッドによる高密度記録再生時のS/f’
、lを改良できるもので、その実用的効果は大である。Table (Effects of the Invention) According to the present invention, the ratio of the coercive force in the longitudinal direction of the magnetic recording medium to the coercive force in the direction orthogonal to the longitudinal direction is 1.8 to 3.0.
By using a ferromagnetic thin film in the range of as a magnetic recording layer,
S/f' during high-density recording and reproduction using a ring-type magnetic head
, l can be improved, and its practical effects are great.
第1図は磁気記録媒体の拡大断面図、第2図は強磁性金
属薄膜の長手方向および長手と直交する方向のヒステリ
ラス曲線の一例である。
1・・・高分子基板、2・・・強磁性金属薄膜、3・・
・保護層、4・・・バックコート層。
特許出願人 松下電器産業株式会社
第1図
第2図FIG. 1 is an enlarged cross-sectional view of a magnetic recording medium, and FIG. 2 is an example of a hysteresis curve in the longitudinal direction of a ferromagnetic metal thin film and in a direction orthogonal to the longitudinal direction. 1... Polymer substrate, 2... Ferromagnetic metal thin film, 3...
- Protective layer, 4... back coat layer. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2
Claims (1)
長手方向と長手と直交方向の比が1.8から3.0の範
囲にあることを特徴とする磁気記録媒体。1. A magnetic recording medium comprising a ferromagnetic thin film as a magnetic recording layer, the ferromagnetic thin film having a ratio of coercive force in a longitudinal direction to a direction orthogonal to the longitudinal direction in the range of 1.8 to 3.0.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18813084A JPS6166219A (en) | 1984-09-10 | 1984-09-10 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18813084A JPS6166219A (en) | 1984-09-10 | 1984-09-10 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6166219A true JPS6166219A (en) | 1986-04-05 |
Family
ID=16218249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18813084A Pending JPS6166219A (en) | 1984-09-10 | 1984-09-10 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6166219A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006089648A (en) * | 2004-09-24 | 2006-04-06 | Sekisui Chem Co Ltd | Method for producing hollow resin fine particle, hollow resin fine particle, coating agent for reflection-preventing film and reflection-preventing film |
-
1984
- 1984-09-10 JP JP18813084A patent/JPS6166219A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006089648A (en) * | 2004-09-24 | 2006-04-06 | Sekisui Chem Co Ltd | Method for producing hollow resin fine particle, hollow resin fine particle, coating agent for reflection-preventing film and reflection-preventing film |
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