JPH02246018A - Magnetic disk - Google Patents
Magnetic diskInfo
- Publication number
- JPH02246018A JPH02246018A JP6691489A JP6691489A JPH02246018A JP H02246018 A JPH02246018 A JP H02246018A JP 6691489 A JP6691489 A JP 6691489A JP 6691489 A JP6691489 A JP 6691489A JP H02246018 A JPH02246018 A JP H02246018A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- substrate
- uniform pitch
- sample
- magnetic
- 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 39
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 238000007788 roughening Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000003302 ferromagnetic material Substances 0.000 claims 1
- 230000005347 demagnetization Effects 0.000 abstract description 12
- 238000005520 cutting process Methods 0.000 abstract description 7
- 239000010432 diamond Substances 0.000 abstract description 3
- 229910003460 diamond Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000003746 surface roughness Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910002441 CoNi Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- -1 ZrO2 and Ajz03 Chemical compound 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- MGIUUAHJVPPFEV-ABXDCCGRSA-N magainin ii Chemical compound C([C@H](NC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@@H](NC(=O)CN)[C@@H](C)CC)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(O)=O)C1=CC=CC=C1 MGIUUAHJVPPFEV-ABXDCCGRSA-N 0.000 description 1
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 102200078301 rs121908250 Human genes 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はコンタクト・スタート−ストップ（ｃｏｎｔ
ａｃｔ−ｓｔａｒｔ−ｓｔｏｐ ； Ｃ３５）方式の磁
気記録媒体に組み込まれて使用される磁気ディスクに関
するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to contact start-stop (cont
The present invention relates to a magnetic disk that is incorporated into an act-start-stop; C35) type magnetic recording medium.
磁気記録技術分野では記録密度の上昇に伴って磁気ヘッ
ドと磁気記録媒体の間の間隙（スペーシング）をより小
さくする必要がある。従って、磁気ディスクの表面も超
平滑化が望まれていた。例えば、磁気ディスクの基板と
して用いられるアルミ合金板にニッケル・リンメツキを
施した基板はＮＩＰメツキ後ポリッシングにより表面粗
さが−Ｘ＜ ２０ＯＡに仕上げられている。また、磁気
ヘッドのスライダ面の表面粗さも同様にして超平滑に仕
上げられている。ところが、このように媒体表面とへラ
ドスライダ表面が超平滑に仕上げられていると、ＣＣＳ
方式の磁気ディスク装置に記録媒体を組込んだ場合、停
止中にヘッドと磁気ディスクが吸着を起こしてしまい、
回転とともにヘッドや磁気ディスクに重大な損傷を与え
てしまうという問題点があった。In the field of magnetic recording technology, as recording density increases, it is necessary to reduce the spacing between a magnetic head and a magnetic recording medium. Therefore, it has been desired that the surface of the magnetic disk be made ultra-smooth. For example, a substrate made of an aluminum alloy plate used as a substrate for a magnetic disk and subjected to nickel phosphor plating is finished with a surface roughness of −X<20OA by polishing after NIP plating. Furthermore, the surface roughness of the slider surface of the magnetic head is similarly finished to be ultra-smooth. However, when the media surface and the Herad slider surface are finished so ultra-smoothly, CCS
When a recording medium is installed in a magnetic disk drive using this method, the head and magnetic disk may stick together while the device is stopped.
There was a problem in that the rotation caused serious damage to the head and magnetic disk.
そこで、磁気ディスク表面金粗くするために、基板の表
面にテクスチャ加工が行なわれるようになった。テクス
チャ加工は一般的には、回転させた基板表面に研磨テー
プを押付けることにより細かなキズを生じせしめるもの
であ）、このようにして粗面化された基板表面の粗さ曲
線の例を第２図に示す。図において、横軸は表面の位置
、縦軸は表面の高さである。このテクスチャ加工された
基板の例は、例えば雑誌（ＩＥＥＥ ＴＲＡＮＳＡＣＴ
ＩＯＮＳ ＯＮＭＡＧＮＥＴＩＣ３＊ Ｖｏｌ、Ｍａｇ
−２：Ｌ Ｎｏ−５ｅ Ｓｅｐｔａｍｂｅｒ １９８７
Ｐ、３４０５〜３４０７）で示されている。Therefore, in order to make the surface of the magnetic disk rough, texture processing has been carried out on the surface of the substrate. Texturing is generally a method of creating fine scratches by pressing an abrasive tape onto the surface of a rotated substrate.) An example of the roughness curve of a substrate surface roughened in this way is Shown in Figure 2. In the figure, the horizontal axis is the position of the surface, and the vertical axis is the height of the surface. An example of this textured substrate is, for example, a magazine (IEEE TRANSACT
IONS ONMAGNETIC3* Vol, Mag
-2:L No-5e September 1987
P, 3405-3407).
従来の磁気ディスクでは基板表面が第２図に示したよう
な不規則な凹凸を有しているがために、磁気へラドスラ
イダとの実際での真実接触面積が磁気ディスク表面の位
置により一定とならず、磁気記録層にかかるスライダか
らの応力が不均一で、時には記録した情報が消えてしま
う（減磁）という問題点や、真実接触面積の大きい位置
で磁気ディスクの回転が停止した場合に大きな吸着力が
働きスピンドルモータが回転できないといった問題点か
あつ九。In conventional magnetic disks, the surface of the substrate has irregular irregularities as shown in Figure 2, so the actual contact area with the magnetic rad slider is constant depending on the position of the magnetic disk surface. First, the stress from the slider applied to the magnetic recording layer is uneven, sometimes causing recorded information to disappear (demagnetization), and when the rotation of the magnetic disk stops at a position where the real contact area is large, there is a problem that The problem is that the spindle motor cannot rotate due to the suction force.
この発明は上記のような問題点を解決するためになされ
たもので、減磁や吸着を回避できる磁気記録媒体を得る
ことを目的とする。The present invention was made to solve the above-mentioned problems, and its object is to obtain a magnetic recording medium that can avoid demagnetization and attraction.
この発明に係る磁気ディスクは、基板表面のうち、少な
くともｃｓｓ １行なう領域に、均一なピッチで粗面化
加工を行なうと共に、均一なピッチで表われる突起の高
さを揃えたものである。In the magnetic disk according to the present invention, at least a region of the substrate surface where CSS 1 is applied is roughened at a uniform pitch, and the heights of protrusions appearing at a uniform pitch are made uniform.
この発明における磁気ディスクでは、その基板を例えば
ダイヤモンドもしくはそれに近い硬度を有する材料から
なる切削工具により、表面を均一ピッチで、かつ突起の
高さを揃えて粗面化しているため、磁気へラドスライダ
と接触する面積を磁気ディスク表面のどの位置でも一定
にすることができるので、位置によるヘッド吸着力のバ
ラツキや局所的な応力集中による減磁の危険性を回避で
きる。In the magnetic disk according to the present invention, the surface of the substrate is roughened using a cutting tool made of diamond or a material having a hardness close to that, with a uniform pitch and the height of the protrusions. Since the contact area can be made constant at any position on the magnetic disk surface, it is possible to avoid variations in the head attraction force depending on the position and the risk of demagnetization due to local stress concentration.
以下、この発明の詳細な説明する。 The present invention will be explained in detail below.
サンプル１ ｐ Ａｊ−４％Ｍｇ合金円板上にＮＩＰメ
ツキを施したのち、ポリッシングにより１ ＊９０５＋
ｎｍｔ ＊１３０ｍｍψに仕上げた基板を用い、この基
板上にＣｒｔＣｏＮｌ、Ｃをこの順にスパッタリングに
より成膜した。膜厚はそれぞれ２００ＯＡ、 ５００Ａ
、 ５００Ａである。Sample 1 p After applying NIP plating on the Aj-4%Mg alloy disk, polishing 1 *905+
Using a substrate finished to nmt *130 mmψ, CrtCoNl and C were deposited in this order on this substrate by sputtering. Film thickness is 200OA and 500A respectively.
, 500A.
このようにして作製した磁気ディスク。A magnetic disk produced in this way.
サンプル２；サンプルｌで用いたポリッシュ基板を研磨
テープ（ｗＡ＃２０００）でテクスチャ加工した基板上
にサンプルｌと同様にＣｒ＊ ＣｏＮｉ５ Ｃを成膜す
ることにより作製した磁気ディスク。Sample 2: A magnetic disk manufactured by forming a film of Cr*CoNi5C in the same manner as Sample 1 on a polished substrate used in Sample 1 which was textured with a polishing tape (wA#2000).
サンプル３（この発明の一実施例）；サンプルｌで用い
たポリッシュ基板を毎分６００回転で回転させ、その表
面にダイヤモンド切削工具（切刃先端曲率半径５声ｍ）
を簡し付けながら基板の半径方向に毎分＆ｍｍの速度で
移動させることにより、はぼ同心円に近いキズを形成し
た。このようにして作製した基板上にサンプルｌと同様
にＣｒ ｅ ＣｏＮｉ ＋Ｃを成膜することにより作製
した磁気ディスク。Sample 3 (an embodiment of the present invention): The polished substrate used in Sample I was rotated at 600 revolutions per minute, and a diamond cutting tool (cutting edge curvature radius of 5 m) was placed on its surface.
By moving the substrate in the radial direction at a speed of &mm per minute, scratches close to concentric circles were formed. A magnetic disk was manufactured by forming a film of Cre CoNi +C on the substrate thus manufactured in the same manner as in sample 1.
なお、第１図はこのようにして作製した、この発明の一
実施例による磁気ディスクの表面粗さを示す曲線図であ
る。第２図の従来のものと比べると第１図のものでは凹
凸のピッチは均一であり、かつ、均一なピッチで表われ
る突起の高さはよく揃つている。Incidentally, FIG. 1 is a curve diagram showing the surface roughness of a magnetic disk according to an embodiment of the present invention manufactured in this manner. Compared to the conventional one shown in FIG. 2, the pitch of the unevenness in the one shown in FIG. 1 is uniform, and the heights of the protrusions appearing at the uniform pitch are well aligned.
以上のサンプル１．２．３の表面粗さ（Ｒｚ）、及び４
０’Ｃ７５Ｓ ＲＨにおいて２４時間経湿温後ヘッド吸
着力（ｇ） ’に各々−面当り２４ケ所測定し、またＣ
８８２万回後の減磁（ＣＳＳ前の記録レベルからの出力
低下）（％）ｔそれぞれ６面ずつ測定した。その結果を
表１に示す。The surface roughness (Rz) of Sample 1.2.3 above, and 4
After 24 hours of humidity and temperature at 0'C75S RH, head adsorption force (g) was measured at 24 locations per surface, and C
Demagnetization (decrease in output from the recording level before CSS) (%) after 8.82 million cycles t was measured for 6 surfaces each. The results are shown in Table 1.
表 １
これから、サンプル２とサンプル３とでは表面粗さの平
均値はほぼ等しいにもかかわらず、２４ケ所でのバラツ
キはサンプル３の方がはるかに少ない。また吸着力もサ
ンプル２はかなりパラツいているが、サンプル３ではバ
ラツキがかなり小さくなっている。なお、サンプルｌで
は吸着力がサンプル２．サンプル３とくらべ、はるかに
大きくなっている。さらに減磁をみるとサンプル１では
減磁の非常に小さいものから非常に大きいものまであり
、サンプル２でも減磁の大きさにバラツキがみられる。Table 1 From this, it can be seen that although Sample 2 and Sample 3 have almost the same average value of surface roughness, Sample 3 has much less variation among the 24 locations. In addition, sample 2 has a considerably uneven adsorption force, but sample 3 has a considerably smaller variation. In addition, the adsorption force of sample 1 is the same as that of sample 2. It is much larger than sample 3. Furthermore, looking at the demagnetization, sample 1 has a range of demagnetization from very small to very large, and sample 2 also shows variations in the magnitude of demagnetization.
サンプル３では減磁のバラツキは±１％程度となってお
り、吸着力、減磁の点でサンプル３は他とくらべ格段に
優れていることがわかる０
なお、切削工具による粗面化加工として、切りくずを排
出する除去加工の他に、非除去加工による粗面化つまり
切刃の圧入による刃先左右への盛り上りによる凹凸でも
同様の効果が現われる。即ち、凹凸が均一ピッチでかつ
突起部の高さが揃うような加工手段であればよい。In sample 3, the variation in demagnetization is about ±1%, which shows that sample 3 is significantly superior to the others in terms of attraction force and demagnetization. In addition to removal machining that discharges chips, a similar effect is produced by roughening the surface by non-removal machining, that is, by press-fitting the cutting edge to create unevenness due to bulges to the left and right of the cutting edge. That is, any processing means may be used as long as the unevenness has a uniform pitch and the heights of the protrusions are the same.
また、基板表面の材′質はＮｉＰの他Ｎ１ＣｕＰメツキ
。In addition, the substrate surface material is NiP and N1CuP plating.
アルマイト、アルミ、 ＺｒＯ２，Ａｊｚ０３などのセ
ラミックス、ガラス、プラスチックでも良い。Alumite, aluminum, ceramics such as ZrO2 and Ajz03, glass, and plastic may also be used.
また、磁気記碌層としてＣｏＮｉ薄膜の他、ＣｏＮｌＣ
ｒ。In addition to CoNi thin film, CoNlC can be used as a magnetic recording layer.
r.
７’−ＰＩ！２０３＊ ＣｏＣｒなどの薄膜ｅ ｒ−Ｆ
ｅ２０３１ Ｆｍなどの微粉末を混入した有機質塗膜で
もかまわないし、切削工具による粗面化ハ磁気ディスク
の表面のうち少なくともＣＳＳを行なう領域に施されて
いれば良いのは言うまでもない。7'-PI! 203* Thin film such as CoCr e r-F
It goes without saying that an organic coating film mixed with fine powder such as e2031 Fm may be used, and it goes without saying that the surface roughening using a cutting tool may be applied to at least the area on which CSS is to be performed on the surface of the magnetic disk.
また、この発明による粗面化を施した基板に、遊離砥粒
によるポリッシングを行なって、突起高さをさらに揃え
ることも可能である。It is also possible to further align the protrusion heights by polishing the substrate with the roughened surface according to the present invention using free abrasive grains.
以上のように、この発明によれば、磁気ディスクの基板
表面のうち、少なくともｃｓｓ ６行なう領域に、均一
なピッチで粗面化加工を行なうと共に均一なピッチで表
われる突起の高さを揃えたので磁気ディスク表面の位置
による吸着力のバラツキを小さく抑えると共に、局所的
な応力集中による減磁を防止することが可能となる効果
がある。As described above, according to the present invention, at least the area where CSS 6 is applied on the substrate surface of the magnetic disk is roughened at a uniform pitch, and the heights of the protrusions appearing at a uniform pitch are made uniform. Therefore, it is possible to suppress variations in the adsorption force depending on the position of the magnetic disk surface, and to prevent demagnetization due to local stress concentration.
第１図はこの発明の一実施例による磁気ディスクの表面
粗さを示す曲線図、第２図は従来の磁気ディスクの表面
粗さを示す曲線図である。FIG. 1 is a curve diagram showing the surface roughness of a magnetic disk according to an embodiment of the present invention, and FIG. 2 is a curve diagram showing the surface roughness of a conventional magnetic disk.
Claims (1)
タクト・スタート・ストップ方式の磁気記録装置に組み
込まれて使用される磁気ディスクにおいて、上記基板表
面のうち、少なくともコンタクト・スタート・ストップ
を行う領域に、均一なピッチで粗面化加工を行うと共に
、均一なピッチで表われる突起の高さを揃えたことを特
徴とする磁気ディスク。In a magnetic disk that has a recording layer made of a film containing a ferromagnetic material on a substrate and is used in a contact start/stop type magnetic recording device, at least the contact start/stop layer is formed on the surface of the substrate. What is claimed is: 1. A magnetic disk characterized in that a surface roughening process is performed at a uniform pitch in the area where the roughening is performed, and the heights of protrusions appearing at a uniform pitch are made uniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6691489A JPH02246018A (en) | 1989-03-17 | 1989-03-17 | Magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6691489A JPH02246018A (en) | 1989-03-17 | 1989-03-17 | Magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02246018A true JPH02246018A (en) | 1990-10-01 |
Family
ID=13329715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6691489A Pending JPH02246018A (en) | 1989-03-17 | 1989-03-17 | Magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02246018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04232614A (en) * | 1990-12-21 | 1992-08-20 | Internatl Business Mach Corp <Ibm> | Magnetic recording hard disk whose surface is roughened and surface roughening method |
-
1989
- 1989-03-17 JP JP6691489A patent/JPH02246018A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04232614A (en) * | 1990-12-21 | 1992-08-20 | Internatl Business Mach Corp <Ibm> | Magnetic recording hard disk whose surface is roughened and surface roughening method |
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