JPH0778917B2 - Magneto-optical recording method - Google Patents
Magneto-optical recording methodInfo
- Publication number
- JPH0778917B2 JPH0778917B2 JP30079886A JP30079886A JPH0778917B2 JP H0778917 B2 JPH0778917 B2 JP H0778917B2 JP 30079886 A JP30079886 A JP 30079886A JP 30079886 A JP30079886 A JP 30079886A JP H0778917 B2 JPH0778917 B2 JP H0778917B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- recording
- magneto
- optical recording
- constant
- 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 - Fee Related
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
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は光磁気メモリに用いられる記録方法に関するも
のである。TECHNICAL FIELD The present invention relates to a recording method used in a magneto-optical memory.
（従来技術） 光メモリは大容量ファイルメモリの一つとして注目され
ている。中でも光磁気メモリは、記録情報の書き換えが
可能であるという利点を有していることから各所で盛ん
に研究されている。その記録媒体としては、Tb,Gd,Dy,H
oなどの希土類金属とFe,Co,Niなどの遷移金属との組み
合せによって、作製される非晶質磁性薄膜が、記録感度
が高い、粒界ノイズがない膜面に垂直方向の磁気異方性
を有する膜が容易に作製できるなどの利点を有するため
最も有望視されている。(Prior Art) An optical memory attracts attention as one of large-capacity file memories. Above all, the magneto-optical memory has been actively studied in various places because it has an advantage that the recorded information can be rewritten. As the recording medium, Tb, Gd, Dy, H
Amorphous magnetic thin films produced by combining rare earth metals such as o and transition metals such as Fe, Co, and Ni have high recording sensitivity and magnetic anisotropy in the direction perpendicular to the film surface without grain boundary noise. It is the most promising because it has advantages such as the ability to easily produce a film having
従来、この様な記録媒体に対する情報の記録・消去は次
の様に行われる。記録は、一方向に着磁した記録媒体
に、レーザ光ビームを照射して、媒体温度をキューリ温
度Tcもしくは補償温度Tcomp以上に上昇させ、印加磁界
と記録媒体の反磁界によって反転磁区を形成することに
より行われる。消去は記録媒体に対して磁界を記録時と
は逆極性に印加し、レーザ光ビームを、記録時と同等の
強度で、一様に照射する、いわゆる一括消去により行わ
れる。これにより、記録媒体の磁化状態は、記録前の初
期状態に戻る。Conventionally, recording / erasing of information on such a recording medium is performed as follows. The recording is performed by irradiating a recording medium magnetized in one direction with a laser light beam to raise the medium temperature to the Curie temperature Tc or the compensation temperature Tcomp or more, and an inverted magnetic domain is formed by the applied magnetic field and the demagnetizing field of the recording medium. It is done by The erasing is performed by so-called collective erasing, in which a magnetic field is applied to the recording medium in the opposite polarity to that at the time of recording, and a laser light beam is uniformly irradiated at the same intensity as during recording. As a result, the magnetization state of the recording medium returns to the initial state before recording.
（発明が解決しようとする問題点） ここで、磁界印加手段としては空心コイル、電磁石ある
いは永久磁石が知られているが、いずれを用いても、数
百メルステッド以上の磁界を、高速で切り替えることは
困難である。従って、記録には一定磁界印加中にレーザ
パワーを高速変調する方式が用いられ、また消去には、
一括消去方式が用いられていた。すなわち従来方式では
既に記録された情報に新しい情報を高速で重ね書きする
いわゆるオーバライト性能を持たせることは不可能であ
った。(Problems to be Solved by the Invention) Here, an air-core coil, an electromagnet, or a permanent magnet is known as a magnetic field applying means, whichever is used, a magnetic field of several hundreds Mersted or more is switched at high speed. Is difficult. Therefore, a method of modulating the laser power at high speed during application of a constant magnetic field is used for recording, and for erasing,
The batch erase method was used. That is, in the conventional method, it is impossible to provide so-called overwriting performance for overwriting already recorded information with new information at high speed.
本発明の目的はこの様な問題点を解決するために成され
たものであり、大きな磁界の高速スイッチングが可能な
磁界印加手段と一定磁界印加手段を組み合わせることに
よって、磁界変調による記録を適確に、行える記録方式
を提供することにある。The object of the present invention is to solve such problems, and by combining a magnetic field applying means capable of high-speed switching of a large magnetic field and a constant magnetic field applying means, recording by magnetic field modulation can be performed accurately. It is to provide a recording method that can be performed.
（問題点を解決するための手段） 本発明に係る光磁気記録方式は、一定のレーザ光を、光
磁気記録媒体に照射しながら印加磁界を変化することに
よって、情報の記録を行う光磁気記録方式において、磁
界印加手段か二つの部分A,Bから成り、Ａは、一方向の
磁界の大小を切り替えることができ、ＢはＡの磁界と逆
向きに一定磁界を印加でき、Ａの大きい方の磁界Hs、小
さい方の磁界Ho、記録が始まる記録閾値磁界ＨBthの間
には、 Hs−Ho≧2|HBth｜ の関係があり、かつ、Ｂの一定磁界の大きさが に設定されることを特徴とする。(Means for Solving Problems) A magneto-optical recording method according to the present invention records information by changing an applied magnetic field while irradiating a magneto-optical recording medium with a constant laser beam. In the method, it is composed of a magnetic field applying means or two parts A and B. A can switch the magnitude of the magnetic field in one direction, B can apply a constant magnetic field in the opposite direction to the magnetic field of A, and the larger of A Hs, the smaller magnetic field Ho, and the recording threshold magnetic field H Bth at which recording starts, there is a relationship of Hs−Ho ≧ 2 | H Bth |, and the magnitude of the constant magnetic field of B is It is set to.
（作用） 次に本発明の作用について図面を用いて説明する。第１
図は本発明の方式を模式的に示したものである。本方式
では、一定のレーザ光２を、光磁気記録媒体１に照射し
ながら、印加磁界を変化することによって、印加磁界方
向に対応した磁化として、情報の記録が行われる。磁界
印加手段は二つの部分A,Bから成り、Ａは一方向（−ｙ
の向き）の大きい磁界Hsと小さい磁界Hoを切り替えて印
加でき、ＢはＡと逆向き（＋ｙの向き）に一定磁界 を印加できる。(Operation) Next, the operation of the present invention will be described with reference to the drawings. First
The figure schematically shows the method of the present invention. In this method, information is recorded as magnetization corresponding to the direction of the applied magnetic field by changing the applied magnetic field while irradiating the magneto-optical recording medium 1 with a constant laser beam 2. The magnetic field applying means consists of two parts A and B, where A is in one direction (-y
The magnetic field Hs with a large magnetic field Hs and the magnetic field Ho with a small magnetic field H can be switched and applied, and B is a constant magnetic field in the opposite direction (direction + y) to A. Can be applied.
第２図は、本方式の動作を示す図である。図において、
６は一定レーザパワを照射しながら、磁界を印加した時
の記録磁区幅（ビット径）と、印加磁界ＨBの関係を示
し、ＨBthは、記録が始まる磁界、記録閾値磁界を示
す。７は逆向き印加磁界と、ビット径の関係を示す。こ
のように、＋ｙ方向の磁界ＨBthで−ｙ方向の記録が始
まり、その記録磁区幅は、−ｙ方向の印加磁界の増加に
伴って増加し、一定値以上（６、図中破線近傍）で飽和
し、同様に、＋ｙ方向の記録磁区幅は、＋ｙ方向の印加
磁界（６、図中破線近傍）で飽和することは、良く知ら
れている。それぞれ破線近傍の磁界を印加することによ
り所望の記録がなされる。本願では、あらかじめ、磁界
印加手段Ｂにより＋ｙ方向に一定のバイアス磁界を印加
しておき、これに重畳して、磁界印加手段Ｂにより−ｙ
方向の大小二つの磁界Hs及びHoで変調する。ここでHs,H
o及びＨBthの大きさは、次の関係を満たす様に設定され
る。FIG. 2 is a diagram showing the operation of this system. In the figure,
Reference numeral 6 shows the relationship between the recording magnetic domain width (bit diameter) and the applied magnetic field H B when a magnetic field is applied while irradiating a constant laser power, and H Bth shows the magnetic field at which recording starts and the recording threshold magnetic field. 7 shows the relationship between the reverse applied magnetic field and the bit diameter. In this way, the recording in the −y direction starts with the magnetic field H Bth in the + y direction, and the recording magnetic domain width increases with an increase in the applied magnetic field in the −y direction, and is a certain value or more (6, near the broken line in the figure). It is well known that the recording magnetic domain width in the + y direction is saturated with the applied magnetic field in the + y direction (6, near the broken line in the figure). Desired recording is performed by applying a magnetic field in the vicinity of each broken line. In the present application, a constant bias magnetic field is applied in the + y direction by the magnetic field applying unit B in advance, and the bias magnetic field is superimposed on the bias magnetic field, and the magnetic field applying unit B adds -y.
Modulate with two large and small magnetic fields Hs and Ho. Where Hs, H
The magnitudes of o and H Bth are set so as to satisfy the following relationship.
Hs−Ho≧2|HBth｜ … さらにＢの一定磁界の大きさを に設定し、Ａの磁界を８に示す様にHsとHoの間で、スイ
ッチングすることによって実効的に大きさ の磁界によって変調した記録が行われる。その結果変調
磁界８に対応した記録９が実現される。Hs−Ho ≧ 2 | H Bth ｜ ... Further, the magnitude of the constant magnetic field of B is , And the magnetic field of A is effectively switched by switching between Hs and Ho as shown in 8. The recording is performed by the magnetic field of. As a result, the recording 9 corresponding to the modulation magnetic field 8 is realized.
（実施例） 第３図は本発明の実施例を示す図である。図において一
方向（−ｙの向き）の磁界の大小Hs及びHoを切り替える
手段Ａとして永久磁石10と、これに隣接して設けられた
巻線11を有する高透磁率磁性体からなるコア12とから成
るもの。一方Ａの磁界と逆方向に一定磁界を印加する手
段Ｂとして永久磁石13が用いられる。(Embodiment) FIG. 3 is a view showing an embodiment of the present invention. In the figure, a permanent magnet 10 is provided as means A for switching the magnitude Hs and Ho of the magnetic field in one direction (-y direction), and a core 12 made of a high magnetic permeability material having a winding 11 provided adjacent to the permanent magnet 10. Consisting of. On the other hand, a permanent magnet 13 is used as a means B for applying a constant magnetic field in the direction opposite to the magnetic field of A.
Ａの永久磁石10として長手方向に着磁した厚さ及び幅２
〜3mm、長さ20〜30mmのアルニコ磁石（Alni105）を用い
高透磁率磁性体12として、厚さ及び幅１〜3mm、磁路長1
5〜20mmのMnZnフェライトを用い、巻線11は30〜50ター
ンの線径50μｍの銅線が用いられる。Ａを記録媒体から
1.5mmはなれた位置に、永久磁石端面がくる様に配役し
た場合、巻線電流零の時の垂直磁界初期値Hoとして約15
0Oe、又巻線電流を数百mA流して、コアを飽和させた時
の垂直磁界飽和値Hsとして約500Oeが得られる。The permanent magnet 10 of A has a thickness and width that are magnetized in the longitudinal direction 2
~ 3mm, length 20 ~ 30mm Alnico 105 (Alni105) as high permeability magnetic material 12, thickness and width 1-3mm, magnetic path length 1
A 5 to 20 mm MnZn ferrite is used, and the winding 11 is a 30 to 50 turn copper wire having a diameter of 50 μm. A from the recording medium
When cast so that the end faces of the permanent magnets are located at a distance of 1.5 mm, the initial value of the vertical magnetic field Ho is about 15 when the winding current is zero.
A vertical magnetic field saturation value Hs of about 500 Oe is obtained when the core is saturated by passing 0 Oe or a winding current of several hundred mA.
一方Ｂとして、同様の永久磁石Ｂを、記録媒体から３〜
4mmはなれた位置に、Ａの永久磁石と逆向きに配設した
場合、Ho及びHsと逆向きで、大きさが に近い約300Oeの一定磁界を印加できる。On the other hand, as B, the same permanent magnet B from the recording medium 3 to
When it is placed 4mm away from the permanent magnet A, it is opposite to Ho and Hs, and the size is A constant magnetic field of about 300 Oe can be applied.
第４図にこれらの磁界印加手段と、従来の光磁気ヘッド
を用いて、光磁気ディスクへの記録を行う場合の動作を
モード図を示す。光磁気ディスクとしては、プリグルー
プ付プラスチック基板上に、下地層として約800ÅのSiN
膜、記録媒体として約800ÅのTbFeCo膜、保護膜として
約800ÅのSiN膜をスパッタ法により連続形成したものが
用いられる。FIG. 4 shows a mode diagram of the operation when recording is performed on a magneto-optical disk by using these magnetic field applying means and the conventional magneto-optical head. As a magneto-optical disk, an approximately 800Å SiN base layer is formed on a plastic substrate with a pregroup.
As the film and recording medium, a TbFeCo film having a thickness of about 800 Å and a SiN film having a thickness of about 800 Å are continuously formed by a sputtering method as a protective film.
図４に示す様に、記録媒体をキューリ温度以上に上昇で
きる一定強度のレーザビームを照射しながら（第４図
（ａ））、Ａの巻線に、コアが飽和するに十分な電流値
Isを、記録パターンに応じて通電することによって（第
４図（ｂ））、変調磁界が印加され、記録媒体の走向に
伴う冷却過程で、記録パターンに対応した記録磁化状態
が実現される（第４図（ｃ））。As shown in FIG. 4, while irradiating the laser beam with a constant intensity capable of raising the recording medium to the Curie temperature or higher (FIG. 4 (a)), the winding A is supplied with a sufficient current value to saturate the core.
By energizing Is according to the recording pattern (FIG. 4 (b)), a modulation magnetic field is applied, and a recording magnetization state corresponding to the recording pattern is realized in the cooling process accompanying the strike of the recording medium ( FIG. 4 (c)).
そして、この記録磁化状態は、記録前の磁化状態によら
ずに、上述の変調磁界に、対応したものとなる。又、磁
界印加手段Ａに設けられた巻線のインダクタンスは、数
十マイクロヘンリ程度に設定できるので、HoとHsの切り
替えは、1MHz位の高速領域迄可能である。従って、本方
式では既に記録された情報に新しい情報を高速で重ね書
きするいわゆるオーバライト機能も容易に実現できる。The recording magnetization state corresponds to the above-mentioned modulation magnetic field regardless of the magnetization state before recording. Moreover, since the inductance of the winding provided in the magnetic field applying means A can be set to about several tens of microhenries, the switching between Ho and Hs can be performed up to a high speed region of about 1 MHz. Therefore, this system can easily realize a so-called overwrite function of overwriting already recorded information with new information at high speed.
以上の実施例では、磁界印加手段Ａとして、永久磁石と
コアを組み合わせたものについて述べたが、これに限定
されるものではない。磁界の大小を切り替えることがで
きるものではあれば良い。例えば数十〜数百KHz程度の
低速の磁場の切り替えには従来の空心コイルや電磁石の
コイルに一方向の電流を、オン・オフするものが適用で
きる。In the above embodiments, the magnetic field applying unit A is a combination of a permanent magnet and a core, but the present invention is not limited to this. Anything that can switch the magnitude of the magnetic field may be used. For example, to switch a low-speed magnetic field of about several tens to several hundreds of KHz, a conventional air-core coil or a coil of an electromagnet that turns on / off a unidirectional current can be applied.
（発明の効果） 以上述べた様に、本発明によれば、大きな磁界の高速ス
イッチングが可能な磁界印加手段と、一定磁界印加手段
とを組み合わせることによって磁界変調による記録を適
確に行える記録方法を提供することができる。(Effects of the Invention) As described above, according to the present invention, a recording method capable of appropriately performing recording by magnetic field modulation by combining a magnetic field applying unit capable of high-speed switching of a large magnetic field and a constant magnetic field applying unit. Can be provided.
第１図は本発明の方法を模式的に示した図、第２図及び
第４図は本発明の動作を示す図、第３図は、本発明の実
施例を示す図である。 図において、１……光磁気記録媒体、２……レーザ光、
４……磁界印加手段Ａ、５……磁界印加手段Ｂ、6,7…
…ビット径と印加磁界の関係、８……変調磁界、９……
記録状態、10,13……永久磁石、11……巻線、12……高
透磁率磁性体から成るコアである。FIG. 1 is a diagram schematically showing the method of the present invention, FIGS. 2 and 4 are diagrams showing the operation of the present invention, and FIG. 3 is a diagram showing an embodiment of the present invention. In the figure, 1 ... Magneto-optical recording medium, 2 ... Laser light,
4 ... Magnetic field applying means A, 5 ... Magnetic field applying means B, 6, 7 ...
… Relationship between bit diameter and applied magnetic field, 8 …… Modulation magnetic field, 9 ……
Recording state, 10, 13 ... Permanent magnet, 11 ... Winding, 12 ... Core with high magnetic permeability.
Claims (2)
しながら印加磁界を変化することによって、情報の記録
を行う光磁気記録方法において、磁界印加手段が２つの
部分Ａ、Ｂから成り、Ａは、一方向の磁界の大小を切り
替えることができ、ＢはＡの磁界と逆向きに一定磁界を
印加でき、Ａの大きい方の磁界Hs、小さい方の磁界Ho、
記録が始まる記録閾値磁界ＨBthの間には、 Hs−Ho≧2|HBth｜ の関係があり、かつ、Ｂの一定磁界の大きさが に設定されることを特徴とする光磁気記録方法。1. A magneto-optical recording method for recording information by changing an applied magnetic field while irradiating a magneto-optical recording medium with a constant laser beam, wherein a magnetic field applying means comprises two parts A and B. , A can switch the magnitude of the magnetic field in one direction, B can apply a constant magnetic field in the opposite direction of the magnetic field of A, the larger magnetic field Hs of A, the smaller magnetic field Ho,
The recording threshold magnetic field H Bth at which recording starts has a relationship of Hs−Ho ≧ 2 | H Bth | and the magnitude of the constant magnetic field of B is A magneto-optical recording method, wherein:
に隣接して設けられた巻線を有する高透磁率磁性体から
成るコアとから成ることを特徴とする特許請求の範囲第
１項に記載の光磁気記録再生方法。2. The magnetic field applying means A comprises a permanent magnet and a core made of a high magnetic permeability material having a winding provided adjacent to the permanent magnet. A magneto-optical recording / reproducing method according to the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30079886A JPH0778917B2 (en) | 1986-12-16 | 1986-12-16 | Magneto-optical recording method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30079886A JPH0778917B2 (en) | 1986-12-16 | 1986-12-16 | Magneto-optical recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63152047A JPS63152047A (en) | 1988-06-24 |
| JPH0778917B2 true JPH0778917B2 (en) | 1995-08-23 |
Family
ID=17889226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30079886A Expired - Fee Related JPH0778917B2 (en) | 1986-12-16 | 1986-12-16 | Magneto-optical recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0778917B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278809A (en) * | 1990-01-17 | 1994-01-11 | Olympus Optical Co., Ltd. | Photomagnetic recording apparatus recording with alternating magnetic field and D.C. magnetic field |
-
1986
- 1986-12-16 JP JP30079886A patent/JPH0778917B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63152047A (en) | 1988-06-24 |
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