JPH0353707B2 - - Google Patents
Info
- Publication number
- JPH0353707B2 JPH0353707B2 JP57202435A JP20243582A JPH0353707B2 JP H0353707 B2 JPH0353707 B2 JP H0353707B2 JP 57202435 A JP57202435 A JP 57202435A JP 20243582 A JP20243582 A JP 20243582A JP H0353707 B2 JPH0353707 B2 JP H0353707B2
- Authority
- JP
- Japan
- Prior art keywords
- area
- recording sensitivity
- laser beam
- recorded
- magneto
- 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
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 30
- 230000005415 magnetization Effects 0.000 description 12
- 230000010287 polarization Effects 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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
Description
【発明の詳細な説明】
技術分野
本発明はレーザ・ビームの照射により各種情報
の記録並びに再生を行なう光磁気記録媒体に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magneto-optical recording medium on which various information is recorded and reproduced by irradiation with a laser beam.
従来技術
従来、上記種類の光磁気記録媒体にあつては、
基板上に設けられた磁性層に対し一定の磁界を与
えながら該磁性層にレーザ・ビームを選択的照射
して所望の箇所をキユリー点以上に温度上昇させ
該箇所における磁化の向きを前記磁界方向に配向
し、情報の記録を行なうと共に、磁性層上に照射
されたレーザ・ビームの反射光により磁化の向き
に対応する偏光面におけるカー回転角を検出し、
該カー回転角に基づいて記録された情報の再生を
行つている。Prior Art Conventionally, for the above types of magneto-optical recording media,
While applying a constant magnetic field to the magnetic layer provided on the substrate, selectively irradiate the magnetic layer with a laser beam to raise the temperature of a desired location above the Curie point and change the direction of magnetization at that location in the direction of the magnetic field. At the same time, the Kerr rotation angle in the polarization plane corresponding to the direction of magnetization is detected by the reflected light of the laser beam irradiated onto the magnetic layer.
The recorded information is reproduced based on the car rotation angle.
そして保磁力が異なる領域を同一平面上に配列
した光磁気記録媒体としては、例えば特開昭56−
61032号公報に示すように、保磁力が大きく角形
ヒステリシスを有する領域および保磁力が大きく
角形ヒステリシスを有しない領域を同一平面上に
交互に配列したものが知られている。 As a magneto-optical recording medium in which regions with different coercive forces are arranged on the same plane, for example,
As shown in Japanese Patent No. 61032, there is known a structure in which regions having a large coercive force and having angular hysteresis and regions having a large coercive force and not having angular hysteresis are alternately arranged on the same plane.
しかしながら、保磁力が小さく角形ヒステリシ
スを有しない領域にあつては、膜面に垂直な磁化
がみかけ上、０であるため、この領域に情報を記
録させることは不可能であり、レーザ・ビームの
トラツキングガイドとしてしか使用できなかつ
た。 However, in a region where the coercive force is small and there is no rectangular hysteresis, the magnetization perpendicular to the film surface is apparently 0, so it is impossible to record information in this region, and the laser beam It could only be used as a tracking guide.
また、上記した光磁気記録媒体にあつては、情
報の記録可能な領域としては１種類しかなく、例
えばプログラムデータおよびアドレスデータなど
のように書き換えの必要のない情報も書き換えの
必要な情報と一緒に記録しなければならず、書き
換えを必要とする情報の記録容量が少なくなつて
いる。 Furthermore, in the case of the above-mentioned magneto-optical recording medium, there is only one type of area in which information can be recorded, and information that does not need to be rewritten, such as program data and address data, is included along with information that needs to be rewritten. The storage capacity of information that must be recorded and rewritten is decreasing.
またさらに、上記した光磁気記録媒体にあつて
は、書き換えの必要な情報を書き換えする際に、
書き換えの必要のない情報を誤つて消去するおそ
れを有している。 Furthermore, in the case of the above-mentioned magneto-optical recording medium, when rewriting information that needs to be rewritten,
There is a risk of accidentally erasing information that does not need to be rewritten.
発明の目的
本発明の目的は上記した従来の欠点に鑑み、簡
易な構成により常に書換えを必要としない各種情
報の誤消去を防化しうる光磁気記録媒体を提供す
ることにある。OBJECTS OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a magneto-optical recording medium that has a simple configuration and can prevent erroneous erasure of various information that does not require constant rewriting.
発明の構成 以下、一実施例に従つて本発明を説明する。Composition of the invention Hereinafter, the present invention will be explained according to one embodiment.
第１図は本発明に係る光磁気記録媒体を示す平
面図、第２図は第１図のＡ−Ａ線断面図である。 FIG. 1 is a plan view showing a magneto-optical recording medium according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG.
図中磁性層１は円盤形状からなるガラス板若し
くは樹脂板等の基板２上に高周波スパツタ法、真
空蒸着法、フオトエツチング法、レーザ加工技術
等の成膜技術により形成され、例えば求心側に第
１の磁気記録領域としての低記録感度領域３（賃
１図中斜線で示す）が、また外周側に第２の磁気
記録領域としての高記録感度領域４が配置されて
いる。上記低記録感度領域３はGdTbFeアモルフ
アス磁性薄膜（Gd：ガドリニウム、Tb：テルビ
ウム）からなり、そのキユリー点は約165℃であ
る。 In the figure, a magnetic layer 1 is formed on a disk-shaped substrate 2 such as a glass plate or a resin plate by a film forming technique such as a high frequency sputtering method, a vacuum evaporation method, a photo etching method, or a laser processing technique. A low recording sensitivity area 3 (indicated by diagonal lines in FIG. 1) is arranged as a first magnetic recording area, and a high recording sensitivity area 4 as a second magnetic recording area is arranged on the outer peripheral side. The low recording sensitivity region 3 is made of a GdTbFe amorphous magnetic thin film (Gd: gadolinium, Tb: terbium), and its Kyrie point is approximately 165°C.
高記録感度領域４はTbPyFeアモルフアス磁性
薄膜（Dy：デイスプロシウム）からなり、その
キユリー点は約75℃である。 The high recording sensitivity region 4 is made of a TbPyFe amorphous magnetic thin film (Dy: disprosium), and its Kyrie point is approximately 75°C.
尚、図中５は前記磁性層１上に配置される二酸
化ケイ素（SiO2）等の保護膜である。 Note that 5 in the figure is a protective film made of silicon dioxide (SiO 2 ) or the like disposed on the magnetic layer 1.
次に第３図に従つて本実施例の作用を説明す
る。 Next, the operation of this embodiment will be explained with reference to FIG.
磁性層１に対し一定の磁界Ｍを与えながらその
温度が約80〜100℃に達する出力からなる半導体
レーザ６のON・OFFによりレーザ・ビームが選
択的に照射されると、該レーザ・ビームが照射さ
れた高記録感度領域４は第３図に示す様に局所的
にそのキユリー点以上に温度上昇されると同時
に、前記磁界Ｍにより高記録感度領域４における
磁化の向きが磁界方向に配向され、データを記録
する。即ち２値レベルからなるデータの内、例え
ば信号“１”を磁界方向に配向される磁化によ
り、また信号“０”を反磁界方向に配向される磁
化により記録させる。 When a laser beam is selectively irradiated by turning on and off a semiconductor laser 6 whose output reaches a temperature of approximately 80 to 100°C while applying a constant magnetic field M to the magnetic layer 1, the laser beam As shown in FIG. 3, the irradiated high recording sensitivity region 4 is locally heated to a temperature higher than its Kyrie point, and at the same time, the magnetic field M causes the direction of magnetization in the high recording sensitivity region 4 to be oriented in the direction of the magnetic field. , record data. That is, among data consisting of binary levels, for example, a signal "1" is recorded by magnetization oriented in the direction of the magnetic field, and a signal "0" is recorded by magnetization oriented in the direction of the demagnetizing field.
上記高記録感度領域４に対するデータの記録に
際し、トラツキングエラー等により低記録感度領
域３上に前記レーザ・ビームが照射された場合、
該低記録感度領域３は前記高記録感度領域４より
高いキユリー点からなり、磁界方向に対する磁化
の配向が阻止されるため、該低記録感度領域３に
予め記録されたアドレスデータ、制御プログラム
データ等、常に書換えを必要としないデータの誤
消去を防止する。 When recording data in the high recording sensitivity area 4, if the laser beam is irradiated onto the low recording sensitivity area 3 due to a tracking error or the like,
The low recording sensitivity region 3 has a higher Curie point than the high recording sensitivity region 4, and the orientation of magnetization in the direction of the magnetic field is prevented, so that address data, control program data, etc. recorded in advance in the low recording sensitivity region 3 are , to prevent accidental erasure of data that does not always require rewriting.
尚、低記録感度領域３にデータを記録する場
合、上記と同様に一定の磁界Ｍを与えながら半導
体レーザ６の出力が該低記録感度領域３のキユリ
ー点以上の温度に設定されたレーザ・ビームを選
択的に照射し、照射箇所を局所的に前記キユリー
点以上に温度上昇させると同時に、該箇所におけ
る磁化を磁界方向に配向させ、データの記録を行
なう。 When recording data in the low recording sensitivity region 3, a laser beam is used in which the output of the semiconductor laser 6 is set to a temperature equal to or higher than the Curie point of the low recording sensitivity region 3 while applying a constant magnetic field M in the same manner as above. is selectively irradiated to locally raise the temperature of the irradiated area to above the Curie point, and at the same time, the magnetization at the irradiated area is oriented in the direction of the magnetic field, thereby recording data.
次に上記動作により記録されたデータを再生す
る場合、低記録感度領域３若しくは高記録感度領
域４に対しレーザ・ビームが照射されると、低記
録感度領域３若しくは高記録感度領域４からの反
射光における偏光面はカー効果により照射箇所に
おける磁化の向き基づいて回転され、このカー回
転角により低記録感度領域３若しくは高記録感度
領域４に記録されたデータの読取りを行う。即ち
磁界方向に配向された磁化により偏光面が＋θ回
転したとすると、反磁界方向に配向された磁化に
より偏光面が−θ逆回転される。そして検光子等
により、例えば磁界方向に配向された磁化から反
射されたレーザ・ビームの反射光のみを検出する
構成により低記録感度領域３並びに高記録感度領
域４に記録されたデータを２値レベルにて読取
る。 Next, when reproducing the data recorded by the above operation, when the low recording sensitivity area 3 or the high recording sensitivity area 4 is irradiated with a laser beam, the laser beam is reflected from the low recording sensitivity area 3 or the high recording sensitivity area 4. The plane of polarization of the light is rotated based on the direction of magnetization at the irradiated area due to the Kerr effect, and data recorded in the low recording sensitivity area 3 or the high recording sensitivity area 4 is read based on this Kerr rotation angle. That is, if the plane of polarization is rotated by +θ due to magnetization oriented in the direction of the magnetic field, the plane of polarization is reversely rotated by −θ due to magnetization oriented in the direction of the demagnetizing field. Then, using an analyzer or the like, the data recorded in the low recording sensitivity area 3 and the high recording sensitivity area 4 are analyzed in binary level by a configuration that detects only the reflected light of the laser beam reflected from the magnetization oriented in the direction of the magnetic field. Read at.
従つて本実施例は高記録感度領域４に対し該高
記録感度領域４のキユリー点に対応する出力から
なるレーザ・ビームの照射によりデータを繰返し
記録する際にトラツキングエラー等によりレー
ザ・ビームが低記録感度領域３に照射された場合
であつても、該低記録感度領域３はそのキユリー
点が前記レーザ・ビームの温度より高いため、該
低記録感度領域３に予め記録されたデータの誤消
去を阻止することが可能である。 Therefore, in this embodiment, when data is repeatedly recorded by irradiating the high recording sensitivity area 4 with a laser beam having an output corresponding to the Curie point of the high recording sensitivity area 4, the laser beam may be damaged due to a tracking error or the like. Even if the low recording sensitivity area 3 is irradiated, since the Kyrie point of the low recording sensitivity area 3 is higher than the temperature of the laser beam, errors in the data previously recorded in the low recording sensitivity area 3 may occur. It is possible to prevent erasure.
尚、本発明は第４図Ａ〜Ｃに示す様に低記録感
度領域３（図中斜線で示す）並びに高記録感度領
域４を設ける構成、若しくはデータの書換え頻度
に応じて記録感度が異なる３種類以上の記録領域
を設ける構成であつても実施し得る。 The present invention has a configuration in which a low recording sensitivity area 3 (indicated by diagonal lines in the figure) and a high recording sensitivity area 4 are provided as shown in FIGS. It is also possible to implement a configuration in which more than one type of recording area is provided.
発明の効果
以上説明した様に本発明は、磁性層にレーザ・
ビームを照射して情報の記録・再生が可能な光磁
気記録媒体において、光磁気記録媒体にはキユリ
ー温度が異なり、情報を記録可能な保磁力を有し
た少なくとも第１および第２の磁気記録領域を設
けた構成からなり、例えば低いキユリー温度の磁
気記録領域に情報を記録させる際に、トラツキン
グエラーなどによりレーザ・ビームが高いキユリ
ー温度の磁気記録領域に照射された場合であつて
も、高いキユリー温度の磁気記録領域に記録され
た情報が誤つて消去されることを防止することが
できる。Effects of the Invention As explained above, the present invention provides a magnetic layer with a laser beam.
In a magneto-optical recording medium capable of recording and reproducing information by irradiating a beam, the magneto-optical recording medium has at least first and second magnetic recording areas having different Curie temperatures and having a coercive force capable of recording information. For example, when recording information in a magnetic recording area with a low Curie temperature, even if the laser beam is irradiated onto the magnetic recording area with a high Curie temperature due to a tracking error, the high It is possible to prevent information recorded in the magnetic recording area at the Curie temperature from being accidentally erased.
第１図は本発明に係る光磁気記録媒体を示す平
面図、第２図は第１図のＡ−Ａ線断面図、第３図
はデータの記録状態を示す説明図、第４図Ａ〜Ｃ
は本発明の変更実施例を示す説明図である。
図中１は磁性層、３は低記録感度領域、４は高
記録感度領域である。
FIG. 1 is a plan view showing a magneto-optical recording medium according to the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is an explanatory diagram showing the data recording state, and FIGS. C
FIG. 3 is an explanatory diagram showing a modified embodiment of the present invention. In the figure, 1 is a magnetic layer, 3 is a low recording sensitivity area, and 4 is a high recording sensitivity area.
Claims (1)
録・再生が可能な光磁気記録媒体において、 前記光磁気記録媒体にはキユリー温度が異な
り、情報を記録可能な保磁力を有した少なくとも
第１および第２の磁気記録領域を設けたことを特
徴とする光磁気記録媒体。[Scope of Claims] 1. A magneto-optical recording medium in which information can be recorded and reproduced by irradiating a magnetic layer with a laser beam, wherein the magneto-optical recording medium has a different Curie temperature and a coercive force that allows information to be recorded. 1. A magneto-optical recording medium comprising at least first and second magnetic recording areas having a magnetic recording area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20243582A JPS5992455A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20243582A JPS5992455A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5992455A JPS5992455A (en) | 1984-05-28 |
| JPH0353707B2 true JPH0353707B2 (en) | 1991-08-15 |
Family
ID=16457468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20243582A Granted JPS5992455A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5992455A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5661032A (en) * | 1979-10-22 | 1981-05-26 | Kokusai Denshin Denwa Co Ltd <Kdd> | Optical magnetic recording medium |
-
1982
- 1982-11-17 JP JP20243582A patent/JPS5992455A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5661032A (en) * | 1979-10-22 | 1981-05-26 | Kokusai Denshin Denwa Co Ltd <Kdd> | Optical magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5992455A (en) | 1984-05-28 |
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