JPH0619803B2 - Magnetic recording device - Google Patents
Magnetic recording deviceInfo
- Publication number
- JPH0619803B2 JPH0619803B2 JP62088275A JP8827587A JPH0619803B2 JP H0619803 B2 JPH0619803 B2 JP H0619803B2 JP 62088275 A JP62088275 A JP 62088275A JP 8827587 A JP8827587 A JP 8827587A JP H0619803 B2 JPH0619803 B2 JP H0619803B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- magnetic
- recording
- overwriting
- recording device
- 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
Classifications
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
Landscapes
- Magnetic Record Carriers (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、フレキシブルディスクやハードディスクな
ど、消去を行わず、重ね書き(オーバーライト)によりデ
ータの書き換えを行う磁気記録装置に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a magnetic recording device, such as a flexible disk or a hard disk, for rewriting data by overwriting without erasing.
（従来の技術） 第４図は従来のオーバーライトの概念図である。媒体１
に記録されている信号６の上に広めのギャップ長のヘッ
ド２により新しい信号４を重ね書き(オーバーライト)す
ることによって、同時に前の信号を消去するものであ
る。温度等の変化により記録領域３の大きさが多少変わ
っても、媒体の底まで達しているので、十分な消去率が
得られる。(Prior Art) FIG. 4 is a conceptual diagram of a conventional overwrite. Medium 1
The new signal 4 is overwritten by the head 2 having a wider gap length on the signal 6 recorded in (1) to simultaneously erase the previous signal. Even if the size of the recording area 3 changes to some extent due to a change in temperature or the like, since it reaches the bottom of the medium, a sufficient erasing rate can be obtained.
（発明が解決しようとする問題点） 以上述べたオーバーライトは、記録密度が低い,すなわ
ち、ヘッドのギャップ長が広く媒体の底まで十分に飽和
記録できるような装置では問題なく機能した。(Problems to be Solved by the Invention) The above-described overwrite worked without problems in an apparatus having a low recording density, that is, a head having a wide gap length and capable of performing saturated recording sufficiently to the bottom of the medium.
一方、単層垂直媒体とリングヘッドによる垂直磁気記録
では、急峻な書き込み磁場が得られる狭ギャップのヘッ
ドと比較的厚めの媒体の組み合わせで、良好な記録再生
特性が得られている(信学技報ＭＲ81-8「リングヘッド
による垂直異方性膜への記録」）。このような組み合わ
せでは、媒体を底まで十分に飽和記録することは困難
で、表層記録に近いものとなる。On the other hand, in perpendicular magnetic recording using a single-layer perpendicular medium and a ring head, good recording / reproducing characteristics have been obtained with a combination of a head with a narrow gap capable of obtaining a steep write magnetic field and a medium having a relatively large thickness (see Report MR81-8 "Recording on a vertical anisotropic film by a ring head"). With such a combination, it is difficult to perform saturated recording on the medium to the bottom sufficiently, and the recording becomes close to surface recording.
このときに問題となるのはオーバーライト消去率の確保
である。媒体の磁気特性を選べば、表層記録であっても
−28dB程度のオーバーライト消去率が確保できる(第２
図)が、媒体の抗磁力やヘッドの飽和磁束密度が温度に
より変化すると、第３図のように記録深さが変化し、消
し残りの信号５のためにオーバーライト消去率が劣化す
る。(第10回日本応用磁気学会学術講演概要集5aA-9) 本発明の目的は、このような欠点をなくし、使用温度が
変化してもオーバーライト消去率が劣化することのない
磁気記録装置を提供することにある。The problem at this time is to secure the overwrite erase rate. If the magnetic characteristics of the medium are selected, an overwrite erasure rate of approximately -28 dB can be secured even for surface recording (second
When the coercive force of the medium and the saturation magnetic flux density of the head change with temperature, the recording depth changes as shown in FIG. 3, and the overwrite erasure rate deteriorates due to the unerased signal 5. (10th Annual Meeting of the Japan Society for Applied Magnetics 5aA-9) An object of the present invention is to eliminate the above drawbacks and to provide a magnetic recording apparatus that does not deteriorate the overwrite erasure rate even when the operating temperature changes. To provide.
（問題点を解決するための手段） 本発明の磁気記録装置は、ギャップの近傍もしくはコア
全体がセンダスト系合金からなる磁気ヘッドと、CoとCr
を主成分とし、1.2〜2.0at％のZr、1.3〜2.3at％Hf、1.
5〜2.5at％のTaのいづれかが添加されている記録媒体の
構成であることを特徴としている。(Means for Solving the Problems) A magnetic recording apparatus according to the present invention comprises a magnetic head near the gap or the entire core made of a sendust-based alloy, and Co and Cr.
1.2 to 2.0 at% Zr, 1.3 to 2.3 at% Hf, 1.
One of the features of the recording medium is that it contains 5 to 2.5 at% of Ta.
（作用） このような添加物を入れることにより、CoCr膜では−0.
34％degであった抗磁力の温度係数が第１図のように変
化する。図中の破線はセンダストの飽和磁束密度の温度
係数−0.11％degを示したものである。前述のような添
加量とすることで、センダストの飽和磁束密度の温度係
数と近い抗磁力の温度係数を持つ媒体になる。このよう
にヘッドの飽和磁束密度の温度係数αBsと媒体の抗磁力
の温度係数αHcが近い値にしてあると、記録深さｙの温
度変化dy/dTが となることから、温度による記録深さの変化が少ない磁
気記録装置ができる。したがって、温度変化による第３
図のようなオーバーライト消去率の劣化をきわめて小さ
くできる。(Function) With the addition of such an additive, the CoCr film has a value of −0.
The temperature coefficient of coercive force, which was 34% deg, changes as shown in Fig. 1. The broken line in the figure shows the temperature coefficient of the saturation magnetic flux density of Sendust −0.11% deg. By adjusting the addition amount as described above, a medium having a temperature coefficient of coercive force close to the temperature coefficient of the saturation magnetic flux density of Sendust is obtained. As described above, when the temperature coefficient α Bs of the saturation magnetic flux density of the head and the temperature coefficient α Hc of the coercive force of the medium are close to each other, the temperature change dy / dT of the recording depth y is Therefore, it is possible to provide a magnetic recording device in which the change in recording depth due to temperature is small. Therefore, the third
The deterioration of the overwrite erase rate as shown in the figure can be made extremely small.
（実施例） 以下、本発明の実施例および参考例を示す。媒体は20at
％CrのCoCr合金ターゲットの上にZr,Hf,Taのペレットを
おき、RFマグネトロンスパッタにて作成した。第１表は
実施例および参考例の添加物とその量、および抗磁力の
温度係数、ギャップ長0.3μｍのセンダストヘッドで測
定した25℃でのオーバーライト消去率(O/W25)、10℃で
書き込み50℃で重ね書きしたときのオーバーライト消去
率(O/W10-50)、50℃で書き込み10℃で重ね書きしたとき
のオーバーライト消去率(O/W50/10)をまとめたものであ
る。測定方法を述べると、先づ50kFRPIの信号を書き込
んでおき、22kFRPIの信号を重ね書きし、重ね書きによ
る50kFRPIの信号の減衰量をオーバーライト消去率とし
た。装置として供するためにはO/W25、O/W10-50、O/W
50-10のいづれもが−26dB以下である必要がある。(Examples) Examples and reference examples of the present invention will be shown below. Medium is 20at
Zr, Hf, and Ta pellets were placed on a CoCr alloy target of% Cr, and RF magnetron sputtering was performed. Table 1 shows the additive and its amount in Examples and Reference Examples, the temperature coefficient of coercive force, the overwrite erasure rate (O / W 25 ) at 25 ° C measured by a sendust head with a gap length of 0.3 μm, and 10 ° C. The erase erasure rate (O / W 10-50 ) when overwriting at 50 ℃ and the overwrite erasure rate (O / W 50/10 ) when overwriting at 10 ℃ were summarized. It is a thing. To describe the measurement method, a signal of 50 kFRPI was written in advance, a signal of 22 kFRPI was overwritten, and the amount of attenuation of the signal of 50 kFRPI due to overwriting was taken as the overwrite erasure rate. O / W 25 , O / W 10-50 , O / W to serve as equipment
Each of 50-10 must be less than -26 dB.
実施例では温度係数がセンダストの飽和磁化のそれ(−
0.11％/deg)に対して±0.04％/degの範囲(第１図の点線
の範囲)に入っており、O/W10-50、O/W50-10がO/W25に比
べて大きく劣化することはないが、参考例のCoCrや添加
原素の少いものではO/W50-10が劣化して−26dBを上回っ
てしまう。また、添加しすぎるとO/W10-50が劣化する。In the example, the temperature coefficient is that of the saturation magnetization of Sendust (−
0.11% / deg) is within ± 0.04% / deg (dotted line range in Fig. 1), and O / W 10-50 and O / W 50-10 are compared to O / W 25. Although it does not deteriorate significantly, the O / W 50-10 deteriorates and exceeds -26 dB with the CoCr of the reference example and a small amount of added elements. Also, if added too much, O / W 10-50 deteriorates.
（発明の効果） 以上のように本発明の磁気記録装置では表層記録的であ
っても、周囲温度の変化によるオーバーライト消去率の
劣化をきわめて少く抑えることができる。 (Effects of the Invention) As described above, in the magnetic recording apparatus of the present invention, deterioration of the overwrite erasing rate due to a change in ambient temperature can be suppressed to a very small level even if recording is performed in the surface layer.
第１図は添加原素量によるCoCrZr,CoCrHf,CoCrTaの抗磁
力の温度係数の変化を示した図である。 第２図は本発明の実施したときのオーバーライトの概念
図である。 第３図は温度特性を無視して作製した装置のオーバーラ
イトの概念図である。 第４図は従来装置のオーバーライトの概念図である。 図において、 １……媒体の記録層、２……ヘッド ３……記録領域、４……新しい信号 ５……消し残りの信号、６……既に記録されている信号FIG. 1 is a diagram showing changes in the temperature coefficient of the coercive force of CoCrZr, CoCrHf, and CoCrTa depending on the amount of the added raw material. FIG. 2 is a conceptual diagram of overwriting when the present invention is implemented. FIG. 3 is a conceptual diagram of overwriting of a device manufactured by ignoring temperature characteristics. FIG. 4 is a conceptual diagram of overwriting of the conventional device. In the figure, 1 ... recording layer of medium, 2 ... head 3 ... recording area, 4 ... new signal, 5 ... remaining unerased signal, 6 ... already recorded signal
Claims (3)
系合金からなる磁気ヘッドとCo、Cr及びZrを主成分とす
る磁気記憶媒体の構成により、表層記録で重ね書きによ
りデータの書き換えを行う磁気記録装置において、磁気
記録媒体中のZrの含有量が1.2〜2.0at％であることを特
徴とする磁気記録装置。1. A magnetic recording device for rewriting data by overwriting in surface layer recording, comprising a magnetic head comprising a sendust alloy in the vicinity of the gap or in its entirety and a magnetic storage medium containing Co, Cr and Zr as main components. In the magnetic recording device, the content of Zr in the magnetic recording medium is 1.2 to 2.0 at%.
系合金からなる磁気ヘッドとCo、Cr及びHfの主成分とす
る磁気記録媒体の構成により、表層記録で重ね書きによ
りデータの書き換えを行う磁気記録装置において、磁気
記録媒体中のHfの含有量が1.3〜2.3at％であることを特
徴とする磁気記録装置。2. A magnetic recording apparatus for rewriting data by overwriting in surface layer recording by the structure of a magnetic head in the vicinity of or the entire gap made of a sendust alloy and a magnetic recording medium containing Co, Cr and Hf as main components. In the magnetic recording apparatus, the Hf content in the magnetic recording medium is 1.3 to 2.3 at%.
系合金からなる磁気ヘッドとCo、Cr及びTaを主成分とす
る磁気記録媒体の構成により、表層記録で重ね書きによ
りデータの書き換えを行う磁気記録装置において、磁気
記録媒体中のTaの含有量が1.5〜2.5at％であることを特
徴とする磁気記録装置。3. A magnetic recording device for rewriting data by overwriting in surface layer recording, by the constitution of a magnetic recording medium containing Co, Cr and Ta as main components in the vicinity of the gap or entirely of a sendust type alloy. In the magnetic recording device, the content of Ta in the magnetic recording medium is 1.5 to 2.5 at%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62088275A JPH0619803B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62088275A JPH0619803B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63253501A JPS63253501A (en) | 1988-10-20 |
| JPH0619803B2 true JPH0619803B2 (en) | 1994-03-16 |
Family
ID=13938352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62088275A Expired - Lifetime JPH0619803B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619803B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61182915A (en) * | 1985-02-12 | 1986-08-15 | Mitsubishi Petrochem Co Ltd | Injection molding method of box-shaped two-layer molded member |
| JPS61213145A (en) * | 1985-03-19 | 1986-09-22 | 椎名 二三幸 | Composite plastic molded shape |
-
1987
- 1987-04-09 JP JP62088275A patent/JPH0619803B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61182915A (en) * | 1985-02-12 | 1986-08-15 | Mitsubishi Petrochem Co Ltd | Injection molding method of box-shaped two-layer molded member |
| JPS61213145A (en) * | 1985-03-19 | 1986-09-22 | 椎名 二三幸 | Composite plastic molded shape |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63253501A (en) | 1988-10-20 |
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