JPH0619804B2 - Magnetic recording device - Google Patents
Magnetic recording deviceInfo
- Publication number
- JPH0619804B2 JPH0619804B2 JP9225987A JP9225987A JPH0619804B2 JP H0619804 B2 JPH0619804 B2 JP H0619804B2 JP 9225987 A JP9225987 A JP 9225987A JP 9225987 A JP9225987 A JP 9225987A JP H0619804 B2 JPH0619804 B2 JP H0619804B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- magnetic
- recording device
- recording
- medium
- 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
- 230000005291 magnetic effect Effects 0.000 title claims description 33
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000010952 cobalt-chrome Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Record Carriers (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 functioned without problems in an apparatus having a low recording density, that is, a head having a wide gap length and capable of performing sufficient saturated recording up 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て、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 by combining a head with a narrow gap capable of obtaining a steep writing 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、磁気ヘッドの特性に磁気記録媒体の特
性をあわせることによりこのような欠点をなくし、使用
温度Ｔ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 Applied Magnetics Society of Japan, 5aA-9) The object of the present invention is to eliminate such a defect by adjusting the characteristics of the magnetic recording medium to the characteristics of the magnetic head, thereby changing the operating temperature T. Another object is to provide a magnetic recording device in which the overwrite erasing rate does not deteriorate.
(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Co,Zr及びNbを主成分とする合金からなる磁気ヘ
ッドと、CoとCrを主成分とし、1.9〜3.0at%のZr、2.1〜
3.5at%Hf、2.5〜4.0at%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 Problems) The magnetic recording device of the present invention has a magnetic head in the vicinity of the gap or the entire core made of an alloy containing Co, Zr, and Nb as main components, and Co and Cr as main components. 1.9 ~ 3.0at% Zr, 2.1 ~
It is characterized in that the recording medium has a composition to which either 3.5 at% Hf or 2.5 to 4.0 at% Ta is added.
(作用) このような添加物を入れることにより、CoCr膜では-0.3
4%/degであった抗磁力の温度数が第１図のように変化す
る。図中の破線はCoZrNbの飽和磁束密度の温度係数-0.0
32%/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) By adding such additives, the CoCr film has a -0.3
The temperature number of the coercive force, which was 4% / deg, changes as shown in Fig. 1. The dashed line in the figure is the temperature coefficient of saturation magnetic flux density of CoZrNb -0.0
It shows 32% / 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 of the recording depth y
/ dT 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CoZrNb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(O/W
10-50)、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(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50kFR
PI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/W50-10のい
ずれもが−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 the target was created by RF magnetron sputtering. Table 1 shows the additives and their amounts in Examples and Reference Examples, the temperature coefficient of coercive force, the overwrite erasure rate (O / W 25 ) at 25 ° C measured by a CoZrNb head having a gap length of 0.3 μm, and 10 ° C. Overwrite erasure when overwriting at 50 ℃ (O / W
10-50 ), writing at 50 ° C and overwrite erasing (O / W 50-10 ) when overwriting at 10 ° C. To describe the measurement method, first write the signal of 50kFRPI, overwrite the signal of 22kFRPI, and write 50kFRPI.
The PI signal attenuation was defined as the overwrite erase rate. All of O / W 25 , O / W 10-50 , and O / W 50-10 must be -26 dB or less to be used as a device.
実施例では媒体の抗磁力の温度係数がセンダストの飽和
磁化のそれ(-0.032%/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/W
50-10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。In the example, the temperature coefficient of the coercive force of the medium is within ± 0.04% / deg with respect to that of the saturation magnetization of Sendust (-0.032% / deg).
It is included in the range (dotted line in Fig. 1), O / W 10-50 , O / W
50-10 does not deteriorate much compared to O / W 25 , but O / W 50-10 deteriorates and exceeds -26 dB with CoCr and a small amount of added element of the reference example.
なお、磁気ヘッドコアの一部、もしくは全体にCoZrNb合
金を用いているが、この合金にその他の添加元素を加え
て組成比が変わっても飽和磁化の温度係数が本実施例に
近い範囲(±0.04%/deg)であれば実用上問題はない。A CoZrNb alloy is used for part or all of the magnetic head core.However, even if the composition ratio is changed by adding other additive elements to this alloy, the temperature coefficient of saturation magnetization is in the range close to that of the present embodiment (± 0.04 % / deg), there is no practical problem.
(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ド消去率を
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 override erasing rate due to a change in ambient temperature can be suppressed to a very small level even if it is a surface recording.
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)
及びNbを主成分とする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1.9〜3.0
at％であることを特徴とする磁気記録装置。1. Co, Zr in the vicinity of the gap or in the entire core
Magnetic heads made of alloys containing Nb and Nb as main components and Co and Cr
In a magnetic recording device that rewrites data by overwriting in surface recording due to the configuration of the magnetic storage medium containing Zr as a main component, the content of Zr in the magnetic recording medium is 1.9 to 3.0.
A magnetic recording device characterized by being at%.
及びNbを主成分とする合金からなる磁気ヘッドとCo、Cr
及びHf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Hfの含有量が2.1〜3.5
at％であることを特徴とする磁気記録装置。2. Co, Zr near the gap or in the entire core
Magnetic heads made of alloys containing Nb and Nb as main components and Co and Cr
In a magnetic recording device that rewrites data by overwriting in surface recording due to the configuration of a magnetic recording medium containing Hf as a main component, the content of Hf in the magnetic recording medium is 2.1 to 3.5.
A magnetic recording device characterized by being at%.
及びNbを主成分とする合金からなる磁気ヘッドとCo、Cr
およびTa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2.5〜4.0
at％であることを特徴とする磁気記録装置。3. Co, Zr in the vicinity of the gap or in the entire core
Magnetic heads made of alloys containing Nb and Nb as main components and Co and Cr
In a magnetic recording device that rewrites data by overwriting in surface recording due to the configuration of the magnetic recording medium containing Ta and Ta as a main component, the Ta content in the magnetic recording medium is 2.5 to 4.0.
A magnetic recording device characterized by being at%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9225987A JPH0619804B2 (en) | 1987-04-14 | 1987-04-14 | Magnetic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9225987A JPH0619804B2 (en) | 1987-04-14 | 1987-04-14 | Magnetic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63257901A JPS63257901A (en) | 1988-10-25 |
| JPH0619804B2 true JPH0619804B2 (en) | 1994-03-16 |
Family
ID=14049412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9225987A Expired - Lifetime JPH0619804B2 (en) | 1987-04-14 | 1987-04-14 | Magnetic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619804B2 (en) |
-
1987
- 1987-04-14 JP JP9225987A patent/JPH0619804B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63257901A (en) | 1988-10-25 |
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