JPH056731B2 - - Google Patents
Info
- Publication number
- JPH056731B2 JPH056731B2 JP57167809A JP16780982A JPH056731B2 JP H056731 B2 JPH056731 B2 JP H056731B2 JP 57167809 A JP57167809 A JP 57167809A JP 16780982 A JP16780982 A JP 16780982A JP H056731 B2 JPH056731 B2 JP H056731B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- cobalt
- layer
- plating layer
- nickel alloy
- 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
- 238000007747 plating Methods 0.000 claims description 23
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 16
- 229910000684 Cobalt-chrome Inorganic materials 0.000 claims description 12
- 239000010952 cobalt-chrome Substances 0.000 claims description 12
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 claims description 11
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 8
- 239000010408 film Substances 0.000 description 8
- 229910000531 Co alloy Inorganic materials 0.000 description 7
- 239000010409 thin film Substances 0.000 description 6
- 229910052763 palladium Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
- G11B5/672—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements
Landscapes
- Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
Description
【発明の詳細な説明】
本発明は磁気記憶装置に用いられる磁気デイス
ク等の磁気記憶体にかかる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic storage medium such as a magnetic disk used in a magnetic storage device.
現在主に用いられている長手記録方式において
は、最近高密度記憶媒体として、記憶媒体がめつ
き法又はスパツタ法により製作された連続磁性薄
膜型のめつき磁気デイスク、フエライトスパツタ
磁気デイスクが用いられ始めた。これらの連続磁
性薄膜を記憶媒体とする磁気デイスクを用いた高
性能磁気デイスク装置が1981年に開発され、線密
度14000BPI、トラツク密度1100TPIの高記録密
度が達成されている。 In the longitudinal recording system mainly used at present, continuous magnetic thin film type plated magnetic disks and ferrite sputtered magnetic disks are recently used as high-density storage media. I started. A high-performance magnetic disk device using a magnetic disk using these continuous magnetic thin films as a storage medium was developed in 1981, achieving high recording densities of 14,000 BPI in linear density and 1,100 TPI in track density.
今後、更に高密度化が進む状況にあり、線密度
及びトラツク密度の向上の為の研究開発が活発に
行なわれている。 In the future, the density will continue to increase, and research and development to improve the linear density and track density are actively being carried out.
トラツク密度に関しては、従来からサーボデイ
スクを用いたサーボ面サーボ方式が採用されてい
るが、この方式ではサーボデイスクとデータデイ
スク間の物理的距離及び構造等に基因する温度差
による熱膨張の違いが生じてトラツク密度の増大
の大きな障害になつている。この欠点を除去する
方法として、二層の記憶媒体を有する磁気デイス
クを用いることが報告されている。即ち主に、使
用されているγ−Fe2O3塗布型デイスクにおい
て、下層媒体層にサーボ情報を記録し、上層媒体
層にデータ情報を記録することにより、温度差に
よるトラツク位置ずれを避ける方法である。しか
しながらγ−Fe2O3塗布型デイスクにおいては、
媒体層を薄くすることが困難な為に記録密度を大
巾に増加することは難しく高密度時の媒体Ｓ／Ｎ
が小さいという欠点を有している。 Regarding track density, a servo surface servo method using a servo disk has been used for a long time, but with this method, differences in thermal expansion due to temperature differences caused by the physical distance and structure between the servo disk and data disk are considered. This has become a major obstacle to increasing track density. As a method to eliminate this drawback, it has been reported that a magnetic disk having a two-layer storage medium is used. Specifically, in the γ-Fe 2 O 3 coated disk used, servo information is recorded in the lower medium layer and data information is recorded in the upper medium layer, thereby avoiding track position deviation due to temperature differences. It is. However, in the γ-Fe 2 O 3 coated disk,
It is difficult to greatly increase the recording density because it is difficult to make the media layer thinner, and the media S/N at high density
It has the disadvantage of being small.
一方垂直記録においては、現在コバルト・クロ
ムスパツタ媒体を中心にして研究開発が行なわれ
ているが、リジツドデイスクにおいては線密度が
D50で70000FRPI、（Flux Reversal Per Inch）
の可能性があることが報告されており、又フロツ
ピデイスクではD50で80000FRPI程度の線密度の
可能性があることが報告されている。しかしなが
らこれらの報告で示されたトラツク密度は非常に
小さく、長手記録の現状のトラツク密度
（1100TPI）より大幅に小さい。 On the other hand, in perpendicular recording, research and development is currently being carried out mainly on cobalt-chrome sputter media, but with rigid disks, the linear density is
70000FRPI in D 50 , (Flux Reversal Per Inch)
It has been reported that there is a possibility of a linear density of about 80,000 FRPI at D50 for a floppy disk. However, the track densities shown in these reports are very small, much smaller than the current track density of longitudinal records (1100 TPI).
本発明の目的は高線密度及び高トラツク密度が
可能でかつ高密度時の媒体Ｓ／Ｎが良好な、デー
タ面サーボ方式を実現させるために、下層のサー
ボ情報媒体にめつき法による長手記録用磁性薄膜
媒体を有し、上層のデータ情報媒体にコバルト・
クロムスパツタ法による垂直記録用磁性媒体を有
する磁気２重層垂直磁気記憶体を提供することに
ある。 The purpose of the present invention is to realize a data surface servo system that is capable of high linear density and high track density and has a good medium S/N ratio at high density. The upper layer data information medium is made of cobalt.
An object of the present invention is to provide a magnetic double layer perpendicular magnetic storage body having a magnetic medium for perpendicular recording using the chrome sputtering method.
本発明の下層のサーボ情報媒体に長手記録用磁
性薄膜媒体を用いた理由は、仮に下層に垂直、媒
体を用いた場合には低周波数の記録密度におい
て、正弦波に近いサーボ信号が得られず、多くの
高調波成分を含んでしまい、サーボ信号とデータ
信号を分離することが出来なくなるためである。 The reason why a magnetic thin film medium for longitudinal recording is used as the lower layer servo information medium of the present invention is that if a vertical recording medium is used in the lower layer, a servo signal close to a sine wave cannot be obtained at low frequency recording density. This is because the signal contains many harmonic components, making it impossible to separate the servo signal and data signal.
本発明による磁気記録体は、非磁性基体と該非
磁性基体を被覆するコバルト合金磁性めつき層
と、このコバルト合金磁性めつき層を被覆する非
磁性合金めつき層と、この非磁性合金めつき層を
被覆するコバルト・クロム層と、このコバルト・
クロム層上に保護膜を被覆してなる多層構造を有
しており、コバルト合金磁性めつき層は長手記録
用記憶媒体であり、コバルト・クロム層は垂直記
録用記憶媒体である。本磁気記憶体において、サ
ーボ用磁性媒体となる下層コバルト合金磁性めつ
き層は水平記録でサーボ情報が記録され、データ
用磁性媒体となる、上層のコバルト・クロム層は
垂直記録でデータ情報が記録される。コバルト・
クロム層は、耐食性を有するために、保護膜層を
薄膜化出来るので、スペーシングを小さく出来、
垂直磁気記録媒体として高線密度を達成出来、下
層のサーボ磁性媒体によりデータ面サーボが可能
なために、高トラツク密度が可能となる。 The magnetic recording body according to the present invention comprises a non-magnetic substrate, a cobalt alloy magnetic plating layer covering the non-magnetic substrate, a non-magnetic alloy plating layer covering the cobalt alloy magnetic plating layer, and a cobalt alloy plating layer covering the cobalt alloy magnetic plating layer. Cobalt chromium layer covering the layer and this cobalt chromium layer
It has a multilayer structure consisting of a chromium layer coated with a protective film, with the cobalt alloy magnetic plating layer serving as a longitudinal recording storage medium and the cobalt-chromium layer serving as a perpendicular recording storage medium. In this magnetic storage body, servo information is recorded in the lower cobalt alloy magnetic plating layer, which serves as the magnetic medium for servo, by horizontal recording, and data information is recorded in the upper cobalt-chromium layer, which serves as the magnetic medium for data, by perpendicular recording. be done. cobalt·
Since the chromium layer has corrosion resistance, the protective film layer can be made thinner, so the spacing can be reduced.
High linear density can be achieved as a perpendicular magnetic recording medium, and data surface servo is possible with the underlying servo magnetic medium, making high track density possible.
以下本発明による磁気記憶体の特徴を実施例に
より説明する。 The features of the magnetic storage body according to the present invention will be explained below using examples.
実施例 １ 本発明の一実施例を第１図に示す。Example 1 An embodiment of the present invention is shown in FIG.
第１図において、アルミニウム素板にメツキさ
れ、研摩された非磁性ニツケル合金の非磁性基板
１の上に膜厚0.1μmのコバルト・ニツケル合金磁
性めつき層２を被覆し、このコバルト・ニツケル
合金磁性めつき層２の上に膜厚0.1μmの非磁性ニ
ツケル合金めつき層３を被覆し、この非磁性ニツ
ケル合金めつき層３の上にスパツター法により膜
厚0.5μmのコバルト・クロム垂直磁性、媒体層４
を被覆し、このコバルト・クロム垂直磁性媒体層
４上に膜厚0.02μmの保護膜層５を形成する。こ
のようにして得られる磁気２重層垂直磁気記憶体
をギヤツプ長の大きいサーボ記録用ヘツドにより
スペーシングの小さい条件でサーボ情報を下層磁
性層２と上層磁性層４に記録し、その後ギヤツプ
長の小さいデータ記録再生用ヘツドによりスペー
シングの大きい条件で、上層磁性層２に記録され
たサーボ情報だけを消去する。その結果、下層磁
性層２に記録されたサーボ情報のみが残り、その
サーボ情報をギヤツプ長の小さいデータヘツドで
再生し、サーボ信号として使用する。この様に磁
気記憶体の上層及び下層磁性層の保磁力、スペー
シング、磁性膜厚、ヘツドギヤツプ長等を適当に
選択することにより、かなりの自由度をもつて設
計が可能である。 In FIG. 1, a cobalt-nickel alloy magnetic plating layer 2 with a film thickness of 0.1 μm is coated on a non-magnetic substrate 1 made of a non-magnetic nickel alloy plated and polished on an aluminum base plate. A non-magnetic nickel alloy plating layer 3 with a thickness of 0.1 μm is coated on the magnetic plating layer 2, and a cobalt-chromium perpendicular magnetic layer with a thickness of 0.5 μm is coated on this non-magnetic nickel alloy plating layer 3 by a sputtering method. , media layer 4
A protective film layer 5 having a thickness of 0.02 μm is formed on the cobalt-chromium perpendicular magnetic medium layer 4. Servo information is recorded on the magnetic double-layer perpendicular magnetic storage body thus obtained in the lower magnetic layer 2 and the upper magnetic layer 4 under conditions of small spacing using a servo recording head with a large gap length, and then Only the servo information recorded on the upper magnetic layer 2 is erased by the data recording/reproducing head under conditions of large spacing. As a result, only the servo information recorded on the lower magnetic layer 2 remains, which is reproduced by a data head with a small gap length and used as a servo signal. In this way, by appropriately selecting the coercive force, spacing, magnetic film thickness, head gap length, etc. of the upper and lower magnetic layers of the magnetic memory, it is possible to design the magnetic memory with a considerable degree of freedom.
上層のコバルト・クロム垂直磁性媒体層４はギ
ヤツプ長の小さいデータヘツドにより高線密度
（70000FRPI）の達成を可能にし、下層のコバル
ト・ニツケル合金磁性めつき層２は高トラツク密
度（1500〜3000TPI）の達成を可能にすることが
出来る。 The upper cobalt-chromium perpendicular magnetic media layer 4 enables high linear density (70000 FRPI) to be achieved due to the small gap length data head, and the lower cobalt-nickel alloy magnetic plating layer 2 enables high track density (1500-3000 TPI). can be achieved.
実施例 ２
第２図は実施例１と同様な２重層磁性膜の構成
であるが、基体が異なる。Example 2 FIG. 2 shows the structure of a double-layer magnetic film similar to Example 1, but the base material is different.
即ち、フレキシブルデイスクに適用した場合
で、ポリイミド膜６にパラジウム薄膜７をスパツ
タ法で付与し、そのパラジウム薄膜上に非磁性ニ
ツケル合金８をメツキし、これらを非磁性基体と
して、その上に実施例１と同様な磁気２重層を構
成する。この様にして作製したフレキシブルデイ
スクは線密度80000FRPI（D50）の高密度記録を
可能し、下層コバルト合金メツキ膜のサーボ情報
により高トラツク密度化が可能となる。 That is, when applied to a flexible disk, a palladium thin film 7 is applied to a polyimide film 6 by a sputtering method, a non-magnetic nickel alloy 8 is plated on the palladium thin film, and these are used as a non-magnetic substrate, and the examples are coated on top of the palladium thin film 7. It constitutes a magnetic double layer similar to 1. The flexible disk manufactured in this manner enables high-density recording with a linear density of 80,000 FRPI (D 50 ), and high track density is made possible by the servo information of the lower cobalt alloy plating film.
第１図は実施例１で用いた磁気２重層垂直磁気
記憶体の断面図である。第１図において、
１……非磁性基板、２……コバルト・ニツケル
合金磁性めつき層、３……非磁性ニツケル合金め
つき層、４……コバルト・クロム垂直磁性媒体
層、５……保護膜層、
第２図は実施例２で用いた磁気２重層垂直磁気
記憶体の断面図である。第２図において、
６……ポリイミド膜、７……パラジウム膜、８
……非磁性ニツケル合金めつき層。
FIG. 1 is a sectional view of the magnetic double layer perpendicular magnetic memory used in Example 1. In FIG. 1, 1... non-magnetic substrate, 2... cobalt-nickel alloy magnetic plating layer, 3... non-magnetic nickel alloy plating layer, 4... cobalt-chromium perpendicular magnetic medium layer, 5... protection Figure 2 is a cross-sectional view of the magnetic double layer perpendicular magnetic memory used in Example 2. In Fig. 2, 6... polyimide film, 7... palladium film, 8
...Nonmagnetic nickel alloy plated layer.
Claims (1)
バルト・ニツケル合金磁性めつき層と、このコバ
ルト・ニツケル合金磁性めつき層を被覆する非磁
性ニツケル合金めつき層と、この非磁性ニツケル
合金めつき層を被覆するコバルト・クロム垂直磁
性膜層と、このコバルト・クロム垂直磁性膜層を
被覆する保護膜層とからなり、前記コバルト・ニ
ツケル合金磁性めつき層は、長手記録用記憶媒体
であり、前記コバルト・クロム垂直磁性膜層は垂
直記憶用記憶媒体であることを特徴とする磁気２
重層垂直磁気記憶体。1. A non-magnetic substrate, a cobalt-nickel alloy magnetic plating layer covering the non-magnetic substrate, a non-magnetic nickel alloy plating layer covering the cobalt-nickel alloy magnetic plating layer, and a non-magnetic nickel alloy plating layer covering the cobalt-nickel alloy magnetic plating layer. The cobalt-nickel alloy magnetic plating layer is composed of a cobalt-chromium perpendicular magnetic film layer covering the plating layer and a protective film layer covering the cobalt-chromium perpendicular magnetic film layer, and the cobalt-nickel alloy magnetic plating layer is a storage medium for longitudinal recording. , wherein the cobalt-chromium perpendicular magnetic film layer is a storage medium for perpendicular storage.
Multilayer perpendicular magnetic memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167809A JPS5956217A (en) | 1982-09-27 | 1982-09-27 | Vertical magnetic storage medium having magnetic double layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167809A JPS5956217A (en) | 1982-09-27 | 1982-09-27 | Vertical magnetic storage medium having magnetic double layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5956217A JPS5956217A (en) | 1984-03-31 |
| JPH056731B2 true JPH056731B2 (en) | 1993-01-27 |
Family
ID=15856500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57167809A Granted JPS5956217A (en) | 1982-09-27 | 1982-09-27 | Vertical magnetic storage medium having magnetic double layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5956217A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771518A (en) * | 1980-10-22 | 1982-05-04 | Dainippon Printing Co Ltd | Magnetic recording medium |
| JPS5774827A (en) * | 1980-10-29 | 1982-05-11 | Dainippon Printing Co Ltd | Magnetic recording body |
-
1982
- 1982-09-27 JP JP57167809A patent/JPS5956217A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771518A (en) * | 1980-10-22 | 1982-05-04 | Dainippon Printing Co Ltd | Magnetic recording medium |
| JPS5774827A (en) * | 1980-10-29 | 1982-05-11 | Dainippon Printing Co Ltd | Magnetic recording body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5956217A (en) | 1984-03-31 |
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