JPH04353619A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04353619A JPH04353619A JP15581891A JP15581891A JPH04353619A JP H04353619 A JPH04353619 A JP H04353619A JP 15581891 A JP15581891 A JP 15581891A JP 15581891 A JP15581891 A JP 15581891A JP H04353619 A JPH04353619 A JP H04353619A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- substrate
- magnetic recording
- magnetic head
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ハードディスク装置に
用いられる磁気記録媒体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium used in a hard disk drive.
【０００２】0002
【従来の技術】一般にハードディスク装置において、停
止状態においては、磁気ヘッドが磁気記録媒体上に接触
しており、動作状態においては、磁気ヘッドが磁気記録
媒体上を数μｍ〜コンマ数μｍ浮上して情報の記録／再
生を行なういわゆるコンタクト・スタート・ストップ（
ＣＳＳ）方式が用いられている。このＣＳＳ方式に見ら
れるように、磁気ヘッドが磁気記録媒体上を微小間隔浮
上して、情報の記録／再生を行うため、磁気記録媒体に
は極めて高い平滑度が要求される。この為、磁気記録媒
体は通常、Ａｌ、セラミック、ガラス等からなる非磁性
基板の表面をポリッシュ加工して平滑度を高め、その後
下地層、磁性層、保護層等をスパッタリング等により積
層して製造される。2. Description of the Related Art In general, in a hard disk drive, a magnetic head is in contact with a magnetic recording medium when it is in a stopped state, and when it is in an operating state, the magnetic head floats over the magnetic recording medium by several micrometers to several tenths of a micrometer. So-called contact start/stop (contact start/stop) for recording/reproducing information.
CSS) method is used. As seen in this CSS system, the magnetic head flies above the magnetic recording medium at a minute interval to record/reproduce information, so the magnetic recording medium is required to have extremely high smoothness. For this reason, magnetic recording media are usually manufactured by polishing the surface of a non-magnetic substrate made of Al, ceramic, glass, etc. to increase smoothness, and then layering an underlayer, magnetic layer, protective layer, etc. by sputtering, etc. be done.
【０００３】0003
【発明が解決しようとする課題】近年、ハードディスク
ドライブの小型化に伴ない、より小径の磁気記録媒体が
要求されるようになって来ると共に、より大きい記録容
量をも要求される様になった。この高記録密度化に対応
するために磁気記録媒体の記録面を最外周部付近までム
ダなく使用するとともに磁気ヘッドをより低浮上化させ
る必要が生じている。しかしながら、磁気ヘッドを低浮
上化させた場合、磁気記録媒体の最外周付近での磁気ヘ
ッドの浮上状態が極めて不安定になるという問題が発生
するようになってきた。これは、非磁性基板をポリッシ
ュ加工した時に、非磁性基板の最外周の縁が過剰に研磨
されるいわゆる縁だれが生じる。これらの基板を使用し
、下地層、磁性層、保護層を成膜したのち、ＣＳＳをさ
せると磁気ヘッドの浮上姿勢が不安定となり、ディスク
にキズをつけたりクラッシュを起こすこともある。そし
て、基板の表面をＮｉ−ＰメッキしたＡｌ基板において
は、通常約１．０μｍの縁だれが生じ易いことが判明し
た。[Problem to be Solved by the Invention] In recent years, with the miniaturization of hard disk drives, there has been a demand for magnetic recording media with smaller diameters, as well as a demand for larger recording capacities. . In order to cope with this increase in recording density, it is necessary to use the recording surface of a magnetic recording medium to the vicinity of the outermost periphery without waste, and to lower the flying height of the magnetic head. However, when the flying height of the magnetic head is lowered, a problem has arisen in that the flying state of the magnetic head near the outermost periphery of the magnetic recording medium becomes extremely unstable. This is because when a non-magnetic substrate is polished, the outermost edge of the non-magnetic substrate is excessively polished, resulting in so-called edge sagging. If CSS is performed after forming an underlayer, magnetic layer, and protective layer using these substrates, the flying posture of the magnetic head becomes unstable, which may scratch the disk or cause a crash. It has also been found that an Al substrate whose surface is plated with Ni--P is likely to have an edge sag of about 1.0 .mu.m.
【０００４】本発明は、上述の問題点に鑑みてなされた
もので、高記録容量化が可能な磁気記録媒体を提供する
ことを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a magnetic recording medium capable of increasing recording capacity.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明では円盤状の非磁性基板の磁気ヘッド稼動範
囲の最外周部における縁だれ量を０．３μｍ以下と規制
したことを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that the amount of edge droop at the outermost periphery of the magnetic head operating range of the disk-shaped non-magnetic substrate is regulated to 0.3 μm or less. shall be.
【０００６】[0006]
【作用】上記構成によれば、磁気記録媒体における磁気
ヘッド稼動範囲の最外周部においても、磁気ヘッドの浮
上状態が極めて安定することになる。従って、磁気記録
媒体における磁気ヘッド稼動範囲の最外周部まで記録面
として支障なく利用できることとなり、広い有効記録面
を確保することができる。According to the above structure, the floating state of the magnetic head is extremely stable even at the outermost periphery of the operating range of the magnetic head on the magnetic recording medium. Therefore, the outermost portion of the magnetic head operating range of the magnetic recording medium can be used as a recording surface without any problem, and a wide effective recording surface can be secured.
【０００７】[0007]
【実施例】以下、本発明の実施例を図に基づいて説明す
る。なお、本実施例においては、磁気ヘッドの浮上状態
がいかに安定するかを示す為、非磁性基板の微小突起の
有無をグライドテストヘッドで検査したグライド特性測
定データに基づいて説明するが、磁気記録媒体は非磁性
基板上に磁性層等がそれぞれ均一な厚さに形成されたも
のであり、またグライドテストヘッドの移動範囲と磁気
ヘッドの移動範囲は同一であり、非磁性基板とグライド
テストヘッドとの関係が磁気記録媒体と磁気ヘッドとの
関係と同一と見ることができる。Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. In this example, in order to show how stable the floating state of the magnetic head is, the explanation will be based on glide characteristic measurement data obtained by inspecting the presence or absence of microprotrusions on a non-magnetic substrate using a glide test head. The medium is a non-magnetic substrate with a magnetic layer etc. formed to a uniform thickness, and the movement range of the glide test head is the same as that of the magnetic head. It can be seen that this relationship is the same as that between a magnetic recording medium and a magnetic head.
【０００８】図１，図２は、本発明の一実施例を示すも
のであり、Ａｌ、セラミック、ガラス等の非磁性体から
なる基板１上に、基板１上の微小突起の数を計測する為
に、ピエゾ素子を備えたグライドテストヘッド２が浮上
稼動している。そしてその位置は、磁気ヘッドが磁気記
録媒体上の稼動範囲の最外周部（磁気記録媒体の中心か
ら４６．８ｍｍ離れた円周上）で書込み／読出し動作を
行なう際の位置と同一の位置状態を示している。そして
この時、グライドテストヘッド２のエアベアリング面２
ａにおける最外周側の縁部２ｂが位置する基板１の縁だ
れ部１ａと、基板１の平坦部１ｂとの高さの差（縁だれ
量）ｈを０．３μｍとしている。なお、基板１に十分な
平滑度を得つつ、縁だれ量を０．３μｍ以下に抑えるた
めに、基板１の材質に応じてポリッシュ用パッドの材質
、固さ、ポリッシュ処理時間等を選定する必要がある。FIGS. 1 and 2 show an embodiment of the present invention, in which the number of microprotrusions on a substrate 1 made of a non-magnetic material such as Al, ceramic, or glass is measured. Therefore, a glide test head 2 equipped with a piezo element is operating in a floating manner. This position is the same as the position when the magnetic head performs write/read operations at the outermost periphery of the operating range on the magnetic recording medium (on the circumference 46.8 mm away from the center of the magnetic recording medium). It shows. At this time, the air bearing surface 2 of the glide test head 2
The difference in height (edge sag amount) h between the edge sag portion 1a of the substrate 1 where the outermost edge 2b is located at point a and the flat portion 1b of the substrate 1 is set to 0.3 μm. In addition, in order to obtain sufficient smoothness of the substrate 1 and suppress the amount of edge droop to 0.3 μm or less, it is necessary to select the material, hardness, polishing processing time, etc. of the polishing pad according to the material of the substrate 1. There is.
【０００９】図３は、図１，図２のグライド特性検査結
果を示すグライド特性図である。縦軸が基板１上の微小
突起の検出数、言い換えれば、グライドテストヘッド２
の安定度を示すものであり、横軸はグライドテストヘッ
ド２の浮上量である。図３からわかる様に、縁だれ部１
ａと基板１の平坦部１ｂとの高さの差（縁だれ量）ｈが
０．９μｍ、０．５μｍの場合に比べｈ＝０．３μｍで
はグライド特性用ヘッド２の浮上量が極めて低くなって
も、突起数の検出がほとんどみられない。グライドテス
トヘッドは、突起によってヘッドの姿勢が乱れることを
利用して突起の有無を検出するものであり、突起数の検
出がほとんど見られないということは、基板１上の最外
周の縁だれ部１ａにおいても、グライド特性用ヘッド２
の浮上状態が極めて安定に保たれていることを示してい
る。もちろんこの基板１上に磁性層等を積層した磁気記
録媒体上で磁気ヘッドを低浮上させた場合でも磁気ヘッ
ドの浮上状態が磁気記録媒体上の磁気ヘッド稼動範囲の
最外周部においても極めて安定したものになることはい
うまでもない。FIG. 3 is a glide characteristic diagram showing the glide characteristic test results of FIGS. 1 and 2. The vertical axis is the number of detected microprotrusions on the substrate 1, in other words, the glide test head 2
The horizontal axis is the flying height of the glide test head 2. As can be seen from Figure 3, the edge portion 1
When h = 0.3 μm, the flying height of the glide characteristic head 2 becomes extremely low compared to when the height difference (edge droop amount) h between a and the flat portion 1b of the substrate 1 is 0.9 μm or 0.5 μm. However, the number of protrusions can hardly be detected. The glide test head detects the presence or absence of protrusions by using the fact that the head posture is disturbed by the protrusions, and the fact that the number of protrusions is hardly detected means that Also in 1a, the glide characteristic head 2
This shows that the levitation state is kept extremely stable. Of course, even when a magnetic head is floated at a low level on a magnetic recording medium in which a magnetic layer etc. are laminated on this substrate 1, the floating state of the magnetic head is extremely stable even at the outermost periphery of the operating range of the magnetic head on the magnetic recording medium. Needless to say, it will become something.
【００１０】0010
【発明の効果】以上説明した様に、本発明においては、
非磁性基板の磁気ヘッド稼動範囲の最外周部における縁
だれ量を０．３μｍ以下とすることにより、磁気記録媒
体の磁気ヘッド稼動範囲の最外周部において、磁気ヘッ
ドが低浮上量でも極めて安定して浮上するので、磁気記
録媒体における磁気ヘッド稼動範囲の最外周部まで記録
面として支障なく利用できることとなり、有効記録面を
広げることができ、より小型かつ高記録容量のハードデ
ィスク装置に対応する磁気記録媒体を提供することがで
きる。[Effects of the Invention] As explained above, in the present invention,
By setting the amount of edge droop at the outermost periphery of the magnetic head operating range of the non-magnetic substrate to 0.3 μm or less, the magnetic head can be extremely stable even at a low flying height at the outermost periphery of the magnetic head operating range of the magnetic recording medium. Since the outermost periphery of the operating range of the magnetic head on the magnetic recording medium can be used as a recording surface without any problem, the effective recording surface can be expanded, and the magnetic recording medium can be used in smaller, higher-capacity hard disk drives. media can be provided.
【図１】この発明の一実施例におけるハードディスク装
置の平面図である。FIG. 1 is a plan view of a hard disk device according to an embodiment of the present invention.
【図２】この発明の一実施例における非磁性基板の要部
断面図である。FIG. 2 is a sectional view of a main part of a nonmagnetic substrate in an embodiment of the present invention.
【図３】この発明の一実施例におけるグライド特性図で
ある。FIG. 3 is a glide characteristic diagram in one embodiment of the present invention.
１ 基板 １ａ 縁だれ部 １ｂ 平坦部 ２ グライドテストヘッド ２ｂ ヘッド最外周縁部 1 Board 1a Edge part 1b Flat part 2 Glide test head 2b Outermost edge of head
Claims (1)
けた磁気記録媒体において、該基板の磁気ヘッド稼動範
囲の最外周部における縁だれ量を０．３μｍ以下とした
ことを特徴とする磁気記録媒体。1. A magnetic recording medium comprising a magnetic layer provided on a disc-shaped non-magnetic substrate, characterized in that the amount of edge droop at the outermost periphery of the magnetic head operating range of the substrate is 0.3 μm or less. magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15581891A JPH04353619A (en) | 1991-05-30 | 1991-05-30 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15581891A JPH04353619A (en) | 1991-05-30 | 1991-05-30 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04353619A true JPH04353619A (en) | 1992-12-08 |
Family
ID=15614154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15581891A Pending JPH04353619A (en) | 1991-05-30 | 1991-05-30 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04353619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5926352A (en) * | 1992-02-12 | 1999-07-20 | Ag Technology Co., Ltd. | Magnetic disk and a glass substrate for the magnetic disk |
-
1991
- 1991-05-30 JP JP15581891A patent/JPH04353619A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5926352A (en) * | 1992-02-12 | 1999-07-20 | Ag Technology Co., Ltd. | Magnetic disk and a glass substrate for the magnetic disk |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6577466B2 (en) | Head with active fly height control | |
| US5768075A (en) | Disk medium w/magnetically filled features aligned in rows and columns | |
| US6262572B1 (en) | Thermo-resistive glide test head for disc drive recording media | |
| US5526204A (en) | Low drag liquid bearing recording head | |
| US6216242B1 (en) | Multiple-track magneto-resistive certification and thermal asperity test head | |
| US7515384B2 (en) | Method and apparatus for providing a three stepped air bearing having a funnel structure for controlling air flow to improve fly height performance | |
| JPH07111772B2 (en) | Magnetic disk recorder | |
| US7167343B2 (en) | Head shock resistance and head load/unload protection for reducing disk errors and defects, and enhancing data integrity of disk drives | |
| US6322431B1 (en) | Burnish head with ion milled aerodynamic pads configured in an elliptical pattern | |
| US6496332B1 (en) | Head slider for flexible magnetic disk | |
| US6421205B1 (en) | Recessed slider trailing edge for reducing stiction | |
| US6662623B2 (en) | Apparatus and method for glide height calibration of disk surfaces by use of dual-zone laser texture | |
| US6267004B1 (en) | Glide test head assembly with high take-off resolution | |
| JP7195440B2 (en) | Magnetic recording device with disk having reduced thickness and reduced disk flatness | |
| JP3050998B2 (en) | Magnetic disk | |
| JPH04353619A (en) | Magnetic recording medium | |
| US20020093765A1 (en) | Air bearing surface design for inducing roll-bias during load/unload sequence | |
| JP2005078708A (en) | Magnetic disk and magnetic disk unit provided with the same | |
| US6507458B1 (en) | Head slider and disk apparatus | |
| US6363777B1 (en) | Glide test head assembly with enhanced signal output | |
| JP3478071B2 (en) | Magnetic head and magnetic recording device using the same | |
| US20080020239A1 (en) | Substrate For Magnetic Recording Medium, Magnetic Recording Medium, And Magnetic Recording And Reproducing Device | |
| US6226767B1 (en) | Disc media glide test head | |
| US7251107B2 (en) | Method and apparatus for providing an air bearing pad having improved roll angle sigma | |
| JPH05307748A (en) | Magnetic disk |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19981110 |