JPS6098539A - Magnetic thin film recording medium - Google Patents
Magnetic thin film recording mediumInfo
- Publication number
- JPS6098539A JPS6098539A JP20803483A JP20803483A JPS6098539A JP S6098539 A JPS6098539 A JP S6098539A JP 20803483 A JP20803483 A JP 20803483A JP 20803483 A JP20803483 A JP 20803483A JP S6098539 A JPS6098539 A JP S6098539A
- Authority
- JP
- Japan
- Prior art keywords
- coercive force
- recording medium
- amorphous alloy
- layer
- force layer
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Landscapes
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は主として垂直熱磁気記録方式に用いられる磁性
薄膜記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic thin film recording medium mainly used in a perpendicular thermomagnetic recording system.
垂直熱磁気記録方式とはガラス、セラミックス。Vertical thermomagnetic recording method uses glass and ceramics.
プラスチック等の非磁性体からなる基材上に磁性薄膜か
らなる垂直磁化可能な記録媒体を形成せしめ、該記録媒
体表面にレーザ光線を照射して照射部分をキュリ一点近
傍、もしくは補償点近傍に加熱し、この部分を含む該記
録媒体領域にバイアス磁界をかけることによってこの部
分の磁化を他の部分とは逆の方向に配向せしめることに
より熱磁気的に情報の書き込みを行い、咳情報の読み出
しには別の直線偏光したレーザ光線を核記録媒体表面に
あて、核表面からの反射光を検光子を介して光学的に検
出することによる。即ち該レーザ光線は情報が侵き込オ
れている該記録媒***置においてカー効果によって偏光
面が回転するので、読み出しの際は上記偏光面の回転を
検出“すること（（なる。上記偏光面の回転角度をカー
回転角ｅｋと言う。A perpendicularly magnetizable recording medium made of a magnetic thin film is formed on a base material made of a non-magnetic material such as plastic, and the surface of the recording medium is irradiated with a laser beam to heat the irradiated area to near the Curie point or near the compensation point. By applying a bias magnetic field to the area of the recording medium that includes this part, the magnetization of this part is oriented in the opposite direction to that of other parts, thereby thermomagnetically writing information and reading cough information. This is done by directing another linearly polarized laser beam onto the surface of the nuclear recording medium and optically detecting the reflected light from the nuclear surface through an analyzer. That is, since the plane of polarization of the laser beam rotates due to the Kerr effect at the position of the recording medium where information has penetrated, the rotation of the plane of polarization must be detected during reading. The rotation angle is called the Kerr rotation angle ek.
従来からＨ記記録媒体を構成する磁性薄膜の材料として
吋Ｔｈ−Ｆｅ非晶質合金、Ｄｙ−Ｆｅ非晶質合金、Ｇｄ
−Ｆｅ非晶質合金、Ｇｄ−Ｃｏ非晶質合金等がある。Conventionally, materials for magnetic thin films constituting H-recording media include Th-Fe amorphous alloy, Dy-Fe amorphous alloy, and Gd.
-Fe amorphous alloy, Gd-Co amorphous alloy, etc.
そして咳磁性薄噂表面は通常５ｉＱ２ 、５ｎ０２等の
透明な金属酸化物等からなるや化物保護ｆｆによって被
覆保護されている。しかし上記非晶質合金叶長期間にわ
たる上記酸化物保護膜との接触によって酸化され保磁力
が変動し、記録媒体の磁気記録特性が変化すると言う間
順がある。The magnetically thin surface is usually covered with a compound protection ff made of a transparent metal oxide such as 5iQ2 or 5n02. However, when the amorphous alloy comes into contact with the oxide protective film over a long period of time, it is oxidized and its coercive force fluctuates, causing a change in the magnetic recording characteristics of the recording medium.
本発明Ｉ叶上記従来の間Ｍ ６．を解決することを目的
とし、酸化物保９何嘆に接触する非晶質合金層の材料を
Ｔｈ−Ｆｅ−Ｃｒ非晶質合金としたことを骨子とする。The present invention I and the above conventional M6. In order to solve this problem, the main point is to use a Th-Fe-Cr amorphous alloy as the material of the amorphous alloy layer that contacts the oxide layer.
本発明を以下に詳細に説明する。The present invention will be explained in detail below.
本発明に用いられる酸化物保護膜の材料としては上記し
たように８１０２ 、８１１０２等透明な金属酸化物等
からなる。本発明に用いられるＴｈ −Ｆｅ −Ｃｒ非
晶質合金とは（ＴｂＨＦｅ４＝ＬＪ’） ｌ−ｘ’ ｃ
ｒ−８なるｍｓを有するものであり、０．１５＜Ｙ＜０
．８０ 、０．０１＜ｘ＜０９１０程度とする。ここに
ｘ、ｙは夫々原子比を表わしている。常温においてＣｒ
含量ｘが増加するとカー回転角θｋが減少しＳＮ比が小
さくなる傾向がある。そこでＸＩｄ上記したように原子
比で０．１０以下とすることが望寸しいが、＃酸化性の
点からみればＸは０．０１以上とすることが望ましい。As mentioned above, the material of the oxide protective film used in the present invention is made of transparent metal oxides such as 8102 and 81102. What is the Th-Fe-Cr amorphous alloy used in the present invention (TbHFe4=LJ') l-x' c
r-8 ms, 0.15<Y<0
．． 80, about 0.01<x<0910. Here, x and y each represent an atomic ratio. Cr at room temperature
As the content x increases, the Kerr rotation angle θk tends to decrease and the S/N ratio tends to decrease. Therefore, as mentioned above, it is desirable that the atomic ratio of XId be 0.10 or less, but from the viewpoint of oxidizing properties, it is desirable that X be 0.01 or more.
しかし下記するように非晶質合金層を二層構造とすれば
上記Ｃｒの存在によるカー回転角θにの減少があっても
ＳＮ比が低下しないような記録媒体が得られる。However, as described below, if the amorphous alloy layer has a two-layer structure, a recording medium in which the S/N ratio does not decrease even if the Kerr rotation angle θ is decreased due to the presence of Cr can be obtained.
上記二層構造の非晶質合金層を有する記録媒体の一実施
例を第１図に示す。図に示す記録媒体αｅにνいて（１
）はｎｉＪ記したようなガラス、セラミックス、あるい
はポリメチルメタｌリレート等のプラスチック等の主と
して透明な非磁性体７５島らなる基材であり、（３）は
垂直磁化を示し低キユリ一点を有する高保磁力−であり
、（２）は高キ、リ一点を有する低保磁力層であり、（
４）は透明な酸化物保護膜である。そして低保磁力層１
２）としてはＧｄ−Ｆｅ非非晶質傘布材料として用いら
れ、酸化物保護膜（４）と接卿する高保磁力層（３）と
しては勿倫Ｔｈ −Ｆｅ−Ｃｒ非晶質合金が材料として
用いられる。なお低保磁力層（２）と・伍保磁力禮（３
）とけ交換結合されている。また膜厚として′は基（オ
（１）は１０〜１．５１程度、高床磁力層（８）は２０
０〜４００Ａ程度、低保磁力層（２）は４００〜６００
Ａ程度、酸化物保護膜（４）は８００〜１２００Ａ程度
とされる。An example of a recording medium having the amorphous alloy layer having the above-mentioned two-layer structure is shown in FIG. On the recording medium αe shown in the figure, ν is (1
) is a base material mainly consisting of 75 islands of transparent non-magnetic material such as glass, ceramics, or plastics such as polymethylmetal-relate as described in niJ, and (3) is a high coercive force material that exhibits perpendicular magnetization and has a single low curvature point. -, and (2) is a low coercive force layer with high Ki and one point, (
4) is a transparent oxide protective film. and low coercivity layer 1
As for 2), Gd-Fe is used as an amorphous umbrella cloth material, and as a high coercive force layer (3) in contact with the oxide protective film (4), a Morun Th-Fe-Cr amorphous alloy is used as a material. used as. Note that the low coercive force layer (2) and the coercive force layer (3)
) is melted and exchange coupled. Also, as for the film thickness, '' is a group (O (1) is about 10 to 1.51, and high bed magnetic layer (8) is about 20
0 to 400A, low coercive force layer (2) 400 to 600A
The thickness of the oxide protective film (4) is approximately 800 to 1200A.
第２図において例えば気体レーザ、半導体レーザ等から
出力ｌ〜１００ｍＷで近赤外ないしは可視領域の波長の
光を発振せしめ、線光は対物レンズ（５）を通して記録
媒体０１表面にスゼットを結像し該記録媒体ｆｌｄを局
部的に高保磁力層（３）のキュリ一点近傍に加熱する。In FIG. 2, for example, a gas laser, a semiconductor laser, etc. oscillates light with a wavelength in the near infrared or visible region with an output of 1 to 100 mW, and the line light passes through the objective lens (5) and forms a suzette image on the surface of the recording medium 01. The recording medium fld is locally heated to near the Curie point of the high coercive force layer (3).
該加熱点を含む領域に磁界発生コイル（６）によって５
０〜５０００ｅ程度の、（イアス磁界をかければ加熱点
の高保磁力層＋３）は該ｌくイアス磁界および／または
周辺の磁化からの漏れ磁界によって他の部分とけ反対方
向に＠化される。5 by the magnetic field generating coil (6) in the area including the heating point.
The high coercive force layer of about 0 to 5,000 e (if the Iass magnetic field is applied, the high coercive force layer at the heating point +3) is turned to the opposite direction by the Iass magnetic field and/or the leakage magnetic field from the surrounding magnetization in the opposite direction.
かくして上記スポッートを除去すれは高保磁力ＩＩ Ｃ
３）には情報が書き込まれ、同時に磁高保磁力層（３）
に交換結合している低保磁力層（２）にも情報が書き込
まれる。In this way, the above spots can be removed by using high coercive force II C.
Information is written in the magnetic high coercivity layer (3) at the same time.
Information is also written into the low coercive force layer (2) which is exchange coupled to.
第３図において例えば別のレーザから直線偏光した光を
ハーフミラ−（７）を介し、対物レンズ（５）を通して
記録媒体０００基杓（１）側からスポットとして結像せ
しめ、その反射光は対物レンズ（５）を通しｌＸ−フミ
ラー（７）を介して埼光子（８）を通してフォトクイオ
ード（９）で検出する。、読み出しは情報が書き込まれ
ている低保持力層（２）の情報書き込み位置において前
記したようにカー効果によって該光の偏光面が回転する
のを検出することＫよって行われる。In Fig. 3, for example, linearly polarized light from another laser passes through a half mirror (7) and an objective lens (5) and is imaged as a spot from the recording medium 000 base ladle (1) side, and the reflected light is reflected by the objective lens. (5), a photon (8) is passed through the lX-humirror (7), and detected by a photodiode (9). Reading is performed by detecting rotation of the polarization plane of the light due to the Kerr effect as described above at the information writing position of the low coercivity layer (2) where information is written.
上記したように二層構造の非晶質合金層においては読み
出しくは低保磁力層（２）、即ちＧｄ−Ｆｅ非晶質合金
層から行われるので高保磁力層（３）、即ちＴｈ−Ｆｅ
−Ｃｒ非晶質合金府のカー回転角θには読み出しに直接
的関係を持たなくなり、かくして高保持力層（３）の鎌
の小さいことは鎌の充分大きな低保磁力層（２）でカバ
〜されＳＮ比は減少しない。As mentioned above, in an amorphous alloy layer with a two-layer structure, reading is performed from the low coercive force layer (2), that is, the Gd-Fe amorphous alloy layer;
The Kerr rotation angle θ of the -Cr amorphous alloy has no direct relationship to the readout, and thus the small size of the sickle of the high coercive force layer (3) can be compensated for by the low coercive force layer (2), which has a sufficiently large sickle. ~ and the S/N ratio does not decrease.
本発明において酸化物保護膜に接動する非晶質合金層の
材料として用いられるＴｈ−Ｆｅ−Ｃｒ非晶質合金は大
きな耐酸化性を有するものである。該耐酸化性は第４図
において示される。、音４図に関する実験は、上記実施
例の磁性薄（（椰記録媒体０１について行われ、高保磁
力ｎ（３）としては（Ｔｂ？、２／Ｆｅ ”、）、、７
ｙ ） １−ｘＣｒｘ を用い、該高保磁力層（３）の
保磁力）（Ｃの経時的変化を測定した。The Th-Fe-Cr amorphous alloy used as the material for the amorphous alloy layer in contact with the oxide protective film in the present invention has high oxidation resistance. The oxidation resistance is shown in FIG. , The experiment regarding the sound 4 diagram was conducted on the magnetic thin ((coconut recording medium 01) of the above example, and the high coercive force n(3) was (Tb?, 2/Fe '',), 7
y) 1-xCrx was used to measure the change over time in the coercive force (C) of the high coercive force layer (3).
第４図にみるようにＸ＝Ｏ１即ち従来の１１６成では保
磁力Ｈｃは経時とともに急激に低下するがＸ−０，０１
でけＨｅの経時変化は可成り小さく々す、Ｘ＝０．０５
では殆んど経時変化がない。As shown in Figure 4, in the case of X=O1, that is, the conventional 116 configuration, the coercive force Hc decreases rapidly over time, but X-0,01
The change in Deke He over time is quite small, X=0.05
There is almost no change over time.
４４、図面の簡単な説明
＠１図は本発明の磁性薄膜記録媒体の一実施例の断面図
、第２図は情報書き込み時の説明図、第３図は情報読み
出し時の説明図、・１１４図は保磁力Ｈｃ（ＫＯｅ）の
経時変化（ｍｏｎｔｈ）を示すグラフである。44. Brief explanation of the drawings @ Figure 1 is a cross-sectional view of an embodiment of the magnetic thin film recording medium of the present invention, Figure 2 is an explanatory diagram when information is written, and Figure 3 is an explanatory diagram when information is read out. 114 The figure is a graph showing the change over time (month) of coercive force Hc (KOe).
図中、（２）・・・・低床磁力層、（３）・・・・高保
磁力層、（４）・・・・酸化物保護膜
特許出願人 大同特殊鋼株式会社
１１図
１ ２ 閃
才 ３ 図
ブ ４ 目
（ｍｏｎｔｉｌ ）In the figure, (2)...Low magnetic force layer, (3)...High coercive force layer, (4)...Oxide protective film Patent applicant Daido Steel Co., Ltd. 11 Figure 1 2 Flash 3. 3. 4. montil.
Claims (1)
化物保護膜とからなり、該酸化物保護膜に接触する非晶
質合金層の材料をＴｂ−Ｆｅ−Ｃｒ非晶質合金としたこ
とを特徴とする磁性薄膜記録媒体It consists of an amorphous alloy layer and an oxide protective film formed on the surface of the amorphous alloy layer, and the material of the amorphous alloy layer in contact with the oxide protective film is Tb-Fe-Cr amorphous. A magnetic thin film recording medium characterized by being made of an alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20803483A JPS6098539A (en) | 1983-11-04 | 1983-11-04 | Magnetic thin film recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20803483A JPS6098539A (en) | 1983-11-04 | 1983-11-04 | Magnetic thin film recording medium |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20494292A Division JPH0697517B2 (en) | 1992-07-31 | 1992-07-31 | Magnetic thin film recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6098539A true JPS6098539A (en) | 1985-06-01 |
| JPH053665B2 JPH053665B2 (en) | 1993-01-18 |
Family
ID=16549565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20803483A Granted JPS6098539A (en) | 1983-11-04 | 1983-11-04 | Magnetic thin film recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6098539A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118107A (en) * | 1984-07-04 | 1986-01-27 | Ricoh Co Ltd | Non-crystalline magneto-optical layer |
| JPS6318544A (en) * | 1986-07-09 | 1988-01-26 | Canon Inc | Medium for magneto-optical memory |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727450A (en) * | 1980-07-23 | 1982-02-13 | Ricoh Co Ltd | Magnetic recording medium |
| JPS5996714A (en) * | 1982-11-26 | 1984-06-04 | Ricoh Co Ltd | Magnetic recording medium |
-
1983
- 1983-11-04 JP JP20803483A patent/JPS6098539A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727450A (en) * | 1980-07-23 | 1982-02-13 | Ricoh Co Ltd | Magnetic recording medium |
| JPS5996714A (en) * | 1982-11-26 | 1984-06-04 | Ricoh Co Ltd | Magnetic recording medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118107A (en) * | 1984-07-04 | 1986-01-27 | Ricoh Co Ltd | Non-crystalline magneto-optical layer |
| JPS6318544A (en) * | 1986-07-09 | 1988-01-26 | Canon Inc | Medium for magneto-optical memory |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH053665B2 (en) | 1993-01-18 |
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