JPS58222455A - Photoelectromagnetic recording medium - Google Patents
Photoelectromagnetic recording mediumInfo
- Publication number
- JPS58222455A JPS58222455A JP57103938A JP10393882A JPS58222455A JP S58222455 A JPS58222455 A JP S58222455A JP 57103938 A JP57103938 A JP 57103938A JP 10393882 A JP10393882 A JP 10393882A JP S58222455 A JPS58222455 A JP S58222455A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- film
- recording medium
- permeable material
- external 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
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
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は高透磁率材料からなる反射膜を有する光磁気記
録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magneto-optical recording medium having a reflective film made of a high magnetic permeability material.
従来、光磁気記録媒体としては、
＋１） 垂直磁気異方性膜の表面で光を反射させカー
効果を用いて再生するように構成したもの、および
（２）垂直磁気異方性を示す７膜をうすくして光を透過
するようにしてその下に反射膜を設けてカー効果とファ
ラデー効果の両方を用いて再生するように構成したもの
が知られている。しかしながら上記（１）の構成の光記
録媒体は積層構造にする必要がないために作成し易いと
いう利点はあるが、カー効果が小さいことから再生Ｓ／
Ｎが悪いという欠点がある。Conventionally, magneto-optical recording media include: (1) those configured to reflect light on the surface of a perpendicular magnetic anisotropy film and reproduce using the Kerr effect, and (2) seven films exhibiting perpendicular magnetic anisotropy. There is a known structure in which the light is made thin to transmit light, and a reflective film is provided underneath, so that reproduction can be performed using both the Kerr effect and the Faraday effect. However, although the optical recording medium with the structure (1) above has the advantage that it is easy to produce because it does not need to have a laminated structure, it has a small Kerr effect, so the playback S/
The drawback is that N is poor.
また、上記（２）の構成の光記録媒体は積層構造で作成
しにくいが、カー効果とファラデー効果を用いるため偏
光面の回転角が上記（１）の場合より大きくなり再生８
／Ｎが改良される。しかしながら反射膜としてＡｕ、Ａ
ｇ 、 Ｏｕ、Ａ７などの非磁性体が用いられているた
め、記録ビットの拡がり、および記録されたビットの安
定性（寿命、外部磁界に対する安定性など）に問題があ
った。In addition, although it is difficult to create an optical recording medium having the structure (2) above with a laminated structure, since the Kerr effect and Faraday effect are used, the rotation angle of the polarization plane is larger than that in the case (1) above, making it difficult to create a playback eight.
/N is improved. However, as a reflective film, Au, A
Since nonmagnetic materials such as G, Ou, and A7 are used, there are problems with the spread of recorded bits and the stability of recorded bits (life span, stability against external magnetic fields, etc.).
本発明者は上記問題に鑑み種々検討した結果、反射膜に
高透磁率材料を用いることにより上記欠点を除去するこ
とに成功した。すなわち、本発明の目的は記録ビットの
安定性および拡がυが良くまた読み出し時のコントラス
トを良好且つ安定にするとともに外部磁界の有効利用を
図ることができる光磁気記録媒体を提供することである
。As a result of various studies in view of the above problems, the inventors of the present invention succeeded in eliminating the above drawbacks by using a high magnetic permeability material for the reflective film. That is, an object of the present invention is to provide a magneto-optical recording medium that has good stability and spread of recorded bits, provides good and stable contrast during readout, and makes effective use of an external magnetic field. .
本発明の光磁気記録媒体は垂直磁気異方性を示す垂直磁
化膜の下に高透磁率材料からなる反射膜を設は九ことを
特徴とするものである。The magneto-optical recording medium of the present invention is characterized in that a reflective film made of a high magnetic permeability material is provided below a perpendicularly magnetized film exhibiting perpendicular magnetic anisotropy.
以下、図面に基づいて本発明の詳細な説明する。ｍ１図
は本発明の光磁気記録媒体の構成を概念的に示すもので
あって、基板１の上に高透磁率材料からなる反射膜２を
設けその上に垂直磁気異方性を示す垂直磁化膜３を設け
さらにその上に酸化防止用保護膜４を設けてなる。基板
は非磁性材料からなり、その例としてはガラス、セラミ
ックなどがある。また、反射膜に用いられる高透磁率材
料としては、パーマロイ、Ｆｅ、Ｃ○、Ｎ１などをあげ
ることができる。反射膜は高透磁率材料を蒸着およびス
パッタリングなどによって基板の上に形成することがで
きる。さらに、垂直磁化膜はＧｄ−Ｆｅ、Ｔｂ−Ｆｅ、
Ｄｙ−Ｆｅ、 Ｇｄ−Ｔｂ−Ｆｅ。Hereinafter, the present invention will be described in detail based on the drawings. Fig. m1 conceptually shows the structure of the magneto-optical recording medium of the present invention, in which a reflective film 2 made of a high magnetic permeability material is provided on a substrate 1, and a perpendicular magnetization film exhibiting perpendicular magnetic anisotropy is provided on the substrate 1. A film 3 is provided, and a protective film 4 for preventing oxidation is further provided thereon. The substrate is made of non-magnetic material, examples of which include glass and ceramic. Further, examples of high magnetic permeability materials used for the reflective film include permalloy, Fe, C◯, and N1. The reflective film can be formed on the substrate by vapor deposition, sputtering, or the like using a high magnetic permeability material. Furthermore, the perpendicular magnetization film is Gd-Fe, Tb-Fe,
Dy-Fe, Gd-Tb-Fe.
Ｇｄ−Ｄｙ−Ｆｅなどの重希土類−遷移金属の合金とか
Ｍｎ−Ｂ１、Ｍｎ−０ｕ−Ｂｉなどの多結晶材料からな
り蒸着およびスパッタリングなどにより形成することが
できる。この垂直磁化膜は光を透過することが必要であ
るので膜厚を１ｏｏｏＸ以下好ましくは６００Ｘ以下に
することが必要となる。また、垂直磁化膜はキュリ一点
が低いことが必要であり７０℃〜２００℃が適する範囲
である。保護膜は透明な非磁性材よりなり５ｉＯ１８１
０２な′どを用いることができる。It is made of a heavy rare earth-transition metal alloy such as Gd-Dy-Fe, or a polycrystalline material such as Mn-B1, Mn-0u-Bi, and can be formed by vapor deposition, sputtering, or the like. Since this perpendicular magnetization film needs to transmit light, it is necessary to make the film thickness 100X or less, preferably 600X or less. Further, the perpendicularly magnetized film needs to have a low Curie point, and a suitable range is 70°C to 200°C. The protective film is made of transparent non-magnetic material 5iO181
02' etc. can be used.
本発明の光磁気記録媒体では、反射膜の膜厚は０，１〜
５０μｍ１保護膜の膜厚は０．５〜１μｍそして垂直磁
化膜の膜厚、は０．５μｍ以下とすることが適−・・、
。In the magneto-optical recording medium of the present invention, the thickness of the reflective film is from 0.1 to
The thickness of the 50 μm protective film is preferably 0.5 to 1 μm, and the thickness of the perpendicular magnetization film is preferably 0.5 μm or less.
.
当である。That's true.
第２図は本発明の光磁気記録媒体を用いる記録様式を示
し図示するように変調されたレーザなどの光源５からの
ビームを集束レンズ６に微小スポットに集光しキュリ一
点付近迄加熱し、保磁力が小さくなったところで磁界発
生コイル７からの磁界により磁化反転を起して記録する
ことができる。このとき微小に書込まれたビットは均一
に同じ形でなければならない。ここで問題になるのは外
部磁界の方向である。第３図に示し友ように記録媒体で
は磁界発生コイルから発生した磁力線８が高透磁率層が
対向電極の働きをして垂直磁化膜の膜面に′垂直に入る
ため、磁化反転が斜めに行なわれることがなく書込まれ
たビットの形は周囲がホヤけたり、形が変形することは
ない。オた、外部磁界の集束化が行なわれる友め記録媒
体のうける垂直方向の磁束密度が大きくなシ、外部磁界
の有効利用ができる。また、書込まれたビットは第４図
に示すように高透磁率層があるために隣り同志の逆方向
を向いている磁気モーメントが閉ループをえかくように
存在することになる。そのため、磁気抵抗損失が少なく
なシ、ビットの安定性が増も一般に、垂直磁化膜といっ
ても完全に垂直方向の異方性を示しているのではなく斜
めを向いているものも存在する。ただ膜面に垂直な、方
向に磁界を印加した場合のエネルギー差により垂直異方
性を示している。しかし、ポーラーカー効果を用いて記
録ビットの読出しを行なうためビットのコントラスト比
を良くするためには斜め記録を行なわないようにする必
要がある。−それ故、書込みエリア中で外部磁界が垂直
方向ではなくやや斜めをむいていた部分があるとすると
やや斜めに記録される。FIG. 2 shows a recording format using the magneto-optical recording medium of the present invention. As shown in the figure, a beam from a modulated light source 5 such as a laser is focused on a focusing lens 6 to a minute spot and heated to around the Curie point. When the coercive force becomes small, the magnetic field from the magnetic field generating coil 7 causes magnetization reversal and recording can be performed. At this time, the minutely written bits must have the same uniform shape. The problem here is the direction of the external magnetic field. As shown in Figure 3, in the recording medium, the magnetic field lines 8 generated from the magnetic field generating coil enter perpendicularly to the film surface of the perpendicularly magnetized film with the high magnetic permeability layer acting as a counter electrode, so that the magnetization reversal occurs obliquely. The shape of a bit written without being processed will not be blurred or deformed. Additionally, since the magnetic flux density in the perpendicular direction of the companion recording medium on which the external magnetic field is focused is large, the external magnetic field can be used effectively. Furthermore, as shown in FIG. 4, the written bit has a high magnetic permeability layer, so that adjacent magnetic moments pointing in opposite directions exist so as to form a closed loop. Therefore, magnetoresistance loss is reduced and bit stability is increased.In general, although perpendicularly magnetized films do not exhibit completely perpendicular anisotropy, there are also films that are oriented diagonally. . However, it exhibits perpendicular anisotropy due to the energy difference when a magnetic field is applied in a direction perpendicular to the film surface. However, since the recorded bits are read using the polar Kerr effect, it is necessary to avoid oblique recording in order to improve the contrast ratio of the bits. - Therefore, if there is a part in the write area where the external magnetic field is not perpendicular but slightly oblique, the data will be recorded in a slightly oblique direction.
本発明の光磁気記録媒体は上述したように垂直磁化膜の
下に高透磁率材料からなる反射膜が設けられているため
に外部磁界の拡がりが無くなり垂直方向に集束するため
同じ外部磁界をかけても記録媒体面での磁束速度は大き
くなる。As mentioned above, the magneto-optical recording medium of the present invention has a reflective film made of a high magnetic permeability material under the perpendicularly magnetized film, so that the external magnetic field does not spread and is focused in the perpendicular direction, so that the same external magnetic field is applied. However, the magnetic flux velocity at the recording medium surface increases.
例えば、本発明の光磁気記録媒体面に１０５ガウスの外
部磁界を印加できる東件にして５０μｍのスーノーマロ
イの膜の上に設けた記録媒体面の磁束密度を測ると１５
０ガウスになる。For example, when measuring the magnetic flux density of the recording medium surface provided on a 50 μm Suno Malloy film using the present invention, in which an external magnetic field of 105 Gauss can be applied to the surface of the magneto-optical recording medium, the magnetic flux density is 15 Gauss.
It becomes 0 Gauss.
第１図は本発明の光磁気記録媒体の構成例を示す図であ
り、そして第２図〜第４図は本発明の光磁気記録媒体に
よる記録様式を示す図である。
図において、１・・・基板、２・・・反射膜、３・・・
垂直磁化膜、４・・・保饅膜、５・・・光源、６・・・
集束レンズ、７・・・磁界発生コイル１．：、８・・・
磁力線。
１FIG. 1 is a diagram showing an example of the structure of the magneto-optical recording medium of the present invention, and FIGS. 2 to 4 are diagrams showing recording formats by the magneto-optical recording medium of the present invention. In the figure, 1... substrate, 2... reflective film, 3...
Perpendicular magnetization film, 4... Preservation film, 5... Light source, 6...
Focusing lens, 7...Magnetic field generating coil1. :, 8...
magnetic field lines. 1
Claims (1)
らなる反射膜を設けたことを特徴とする光磁気記録媒体
。A magneto-optical recording medium characterized in that a reflective film made of a high magnetic permeability material is provided under a perpendicular magnetization film exhibiting perpendicular magnetic anisotropy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57103938A JPS58222455A (en) | 1982-06-18 | 1982-06-18 | Photoelectromagnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57103938A JPS58222455A (en) | 1982-06-18 | 1982-06-18 | Photoelectromagnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58222455A true JPS58222455A (en) | 1983-12-24 |
Family
ID=14367377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57103938A Pending JPS58222455A (en) | 1982-06-18 | 1982-06-18 | Photoelectromagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58222455A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163338U (en) * | 1985-03-26 | 1986-10-09 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278403A (en) * | 1975-12-25 | 1977-07-01 | Teac Corp | Magnetic recording media |
| JPS5495250A (en) * | 1978-01-11 | 1979-07-27 | Kokusai Denshin Denwa Co Ltd | Heat magnetic recording system |
| JPS5589928A (en) * | 1978-12-27 | 1980-07-08 | Fujitsu Ltd | Vertical magnetic recorder and its reproduction system |
-
1982
- 1982-06-18 JP JP57103938A patent/JPS58222455A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278403A (en) * | 1975-12-25 | 1977-07-01 | Teac Corp | Magnetic recording media |
| JPS5495250A (en) * | 1978-01-11 | 1979-07-27 | Kokusai Denshin Denwa Co Ltd | Heat magnetic recording system |
| JPS5589928A (en) * | 1978-12-27 | 1980-07-08 | Fujitsu Ltd | Vertical magnetic recorder and its reproduction system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163338U (en) * | 1985-03-26 | 1986-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4126494A (en) | Magnetic transfer record film | |
| JPS6032331B2 (en) | magneto-optical recording medium | |
| JPH0123927B2 (en) | ||
| JPS6227459B2 (en) | ||
| JPS59178641A (en) | Photomagnetic recording medium | |
| JPS60117436A (en) | Magnetooptic storage element | |
| JPS58222455A (en) | Photoelectromagnetic recording medium | |
| JPS61246946A (en) | Photomagnetic recording medium | |
| JPH0782672B2 (en) | Magnetic thin film recording medium | |
| JPS5841451A (en) | Vertical magnetic recording medium | |
| JPS59168954A (en) | Optical magnetic recording medium | |
| JPS60253040A (en) | Photomagnetic recording medium | |
| JPH02267754A (en) | Magneto-optical recording medium | |
| JPH0316049A (en) | Magneto-optical recording medium | |
| JPS61214258A (en) | Write and reproducing integrated magnetic head | |
| JPS5848249A (en) | Vertical magnetic recording medium | |
| JPS5873030A (en) | Optical magnetic recording medium | |
| JPS58171738A (en) | Photomagnetic memory medium | |
| JPS5819753A (en) | Vertical magnetic recording medium and reproducing method of vertical magnetizing signal using said recording medium | |
| JP2647958B2 (en) | Magneto-optical recording medium | |
| JPS5996714A (en) | Magnetic recording medium | |
| JPS60101702A (en) | Recording method of photomagnetic recording medium | |
| JPS6280844A (en) | Photomagnetic recording medium | |
| JPH01260652A (en) | Magneto-optical recording medium | |
| JPH0386954A (en) | Magneto-optical recorder |