JPH0636241B2 - Thermomagnetic recording device - Google Patents
Thermomagnetic recording deviceInfo
- Publication number
- JPH0636241B2 JPH0636241B2 JP57165881A JP16588182A JPH0636241B2 JP H0636241 B2 JPH0636241 B2 JP H0636241B2 JP 57165881 A JP57165881 A JP 57165881A JP 16588182 A JP16588182 A JP 16588182A JP H0636241 B2 JPH0636241 B2 JP H0636241B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- recording medium
- magnetic field
- permanent magnet
- thin film
- 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
- 239000010409 thin film Substances 0.000 claims description 31
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 230000005415 magnetization Effects 0.000 claims description 8
- 239000010408 film Substances 0.000 claims description 7
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000000758 substrate Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052771 Terbium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004065 semiconductor Substances 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
- G11B11/1056—Switching or mechanically reversing the magnetic field generator
-
- 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
- G11B11/10595—Control of operating function
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 〈技術分野〉 本発明はレーザ光の照射熱により情報の記録と消去を行
なう熱磁気記録装置に関する。Description: TECHNICAL FIELD The present invention relates to a thermomagnetic recording apparatus for recording and erasing information by the irradiation heat of laser light.
〈従来技術〉 近年、高密度・大容量・高速アクセス等の要求を満足し
得る光メモリ装置の研究開発が活発に推進されている。
中でも半導体レーザを用いて情報の記録・再生・消去が
可能な光磁気ディスクメモリは画像、文字等のファイル
メモリやビデオディスクメモリへの応用が考えられる為
に特に注目されている。<Prior Art> In recent years, research and development of an optical memory device capable of satisfying requirements such as high density, large capacity, and high speed access have been actively promoted.
Above all, a magneto-optical disk memory capable of recording / reproducing / erasing information by using a semiconductor laser is particularly attracting attention because it can be applied to a file memory for images and characters and a video disk memory.
この光磁気ディスクメモリへの記録はキューリ点記
録、補償点記録、保磁力の温度変化を利用する記録
に分類される。これらはいずれの方式も記録媒体に外部
から一定磁場を印加し、その磁場印加個所にレーザ光を
集光して局所的に温度を上昇させ、上記外部磁場の方向
に磁化を変化させる事で記録を行なうもので熱磁気記録
といわれる。The recording on the magneto-optical disk memory is classified into Curie point recording, compensation point recording, and recording utilizing the temperature change of coercive force. In either of these methods, a constant magnetic field is applied to the recording medium from the outside, the laser light is focused on the magnetic field application point to locally raise the temperature, and the magnetization is changed in the direction of the external magnetic field for recording. This is called thermomagnetic recording.
次にこの熱磁気記録の公知な方式について概略的に説明
する。第１図は従来の熱磁気記録の方式の一例を表わ
す。１はガラス等の透明基板、２は記録磁性体薄膜、３
は保護板である。４はレーザ光、５はレーザ光を集光す
る集光レンズ、６は上記記録磁性体薄膜に対して磁場を
供給するコイルである。この第１図に示した方式はコイ
ルに流す電流の方向或いは電流の大きさを変化させれば
必要とする磁場を容易に得ることができるので機構上は
簡単になる。しかし通常上記記録磁性体薄膜２には記録
時あるいは消去時に上記記録磁性体薄膜２上で約１００
Ｏｅの非常に大きな磁場が必要である事、及び上記記録
磁性体薄膜２へ磁場を供給する為には上記透明基板１ご
しに磁場を供給しなければならず、その為できる限り上
記コイル６を上記透明基板１に近づけたとしても、上記
コイル６と上記透明基板１との間の接触を防止する間隙
等の為に上記コイル６と上記記録磁性体薄膜２との間隔
は２mm程度必要である事の問題があり、これに対する対
応の為には上記コイル６に流す電流を多くするか、上記
コイル６を大きくする事が必要であった。しかしこれら
いずれの対応も装置が大型化し実用的ではなかった。Next, a known method of this thermomagnetic recording will be schematically described. FIG. 1 shows an example of a conventional thermomagnetic recording system. 1 is a transparent substrate such as glass, 2 is a recording magnetic thin film, 3
Is a protective plate. Reference numeral 4 is a laser beam, 5 is a condenser lens for condensing the laser beam, and 6 is a coil for supplying a magnetic field to the recording magnetic thin film. In the system shown in FIG. 1, the required magnetic field can be easily obtained by changing the direction or magnitude of the current passed through the coil, so that the mechanism is simple. However, in general, the recording magnetic thin film 2 has a recording capacity of about 100 when recording or erasing.
O e very large magnetic field that is required, and in order to supply a magnetic field to the recording magnetic film 2 must supply a magnetic field to the transparent substrate 1 your teeth, the coils as much as possible for the Even if 6 is brought close to the transparent substrate 1, the gap between the coil 6 and the recording magnetic thin film 2 needs to be about 2 mm because of a gap or the like for preventing contact between the coil 6 and the transparent substrate 1. However, in order to deal with this, it is necessary to increase the current flowing through the coil 6 or increase the size of the coil 6. However, neither of these measures was practical because the device was large.
一方第２図は従来の熱磁気記録の方式の他の例を表わ
す。この方式は第１図の方式と異なりコイル６の代わり
に記録磁性体薄膜２を挟んで上記集光レンズ５と反対側
に永久磁石７により上記記録磁性体薄膜２に磁場が供給
される。この方式によれば永久磁石７は比較的小型のも
のでも強い磁場を得ることができるので装置を大型化す
る心配がない。但し永久磁石７の磁場の大きさについて
は充分に注意しなければならない。On the other hand, FIG. 2 shows another example of the conventional thermomagnetic recording system. In this system, unlike the system shown in FIG. 1, a magnetic field is supplied to the recording magnetic thin film 2 by a permanent magnet 7 on the side opposite to the condenser lens 5 with the recording magnetic thin film 2 sandwiched in place of the coil 6. According to this method, even if the permanent magnet 7 is relatively small, a strong magnetic field can be obtained, so there is no need to worry about increasing the size of the device. However, attention must be paid to the magnitude of the magnetic field of the permanent magnet 7.
〈発明が解決しようとする問題点〉 本発明は熱磁気記録装置を作成するに際し上述の永久磁
石による外部磁場供給の為の手段に関して次の問題があ
る事を確認した。<Problems to be Solved by the Invention> It was confirmed that the present invention has the following problems regarding the means for supplying the external magnetic field by the above-mentioned permanent magnet when the thermomagnetic recording device is manufactured.
上記記録磁性体薄膜２の材料がMnCuBi等の残留磁化の多
い媒体の場合は記録部の周囲部からの浮遊磁場が大きく
記録時に外部磁場は不要であり、よって記録時には永久
磁石７を上記記録磁性体薄膜２から遠ざけ消去時にのみ
永久磁石７を上記記録磁性体薄膜２に近づける方法が考
えられる。しかし上記記録磁性体薄膜２がGbTbFe，GdTb
DyFe，TbDyFe，GdDyFe，TbFe等の希土類−鉄系の非晶質
磁性体からなる場合は記録部の周囲部からの浮遊磁性が
小さく、従って記録時及び消去時には互いに反対の方向
の外部磁場を与える必要がある。一例を挙げれば上記記
録磁性体薄膜２としてGbTbDyFe膜を用いた場合、このGb
TbDyFe膜の保磁力は0.6ｋOe〜1.5ｋOe，キューリ点は１
２０℃であるが、記録時には１００Oe〜２００Oeの外部
磁場を必要とし消去時には２００Oe〜３００Oeの外部磁
場を必要とした。When the material of the recording magnetic thin film 2 is a medium having a large residual magnetization such as MnCuBi, the stray magnetic field from the peripheral portion of the recording portion is large and an external magnetic field is not required during recording. A method is conceivable in which the permanent magnet 7 is brought close to the recording magnetic thin film 2 only at the time of erasing while keeping away from the thin body film 2. However, the recording magnetic thin film 2 is GbTbFe, GdTb
In the case of a rare earth-iron-based amorphous magnetic material such as DyFe, TbDyFe, GdDyFe, and TbFe, the stray magnetism from the periphery of the recording area is small, and therefore external magnetic fields in opposite directions are applied during recording and erasing. There is a need. As an example, when a GbTbDyFe film is used as the recording magnetic thin film 2,
The coercive force of the TbDyFe film is 0.6 kOe to 1.5 kOe, and the Curie point is 1
Although the temperature was 20 ° C., an external magnetic field of 100 Oe to 200 Oe was required for recording and an external magnetic field of 200 Oe to 300 Oe was required for erasing.
又、上記記録磁性体薄膜２が上記希土類−鉄系の非晶質
磁性体からなる場合は外部磁場が上記記録磁性体薄膜２
の有する保磁力以下の大きさであってもそれが上記記録
磁性体薄膜２に長時間印加されていると常温状態で記録
情報の劣化を来たすことが判明した。例えば保磁力が0.
6ｋOeのGdTbDyFe膜に記録ビットの磁化の方向に３００O
eの磁場を印加して４８〜７２hour放置したところ記録
ビット径が大きくなり、逆に記録ビットの磁化と逆方向
に３００Oeの磁場を印加して放置したところ記録ビット
径が小さくなる現象を見い出した。これら記録情報の不
安定現象は磁性体薄膜の微小欠陥の部分の磁化が磁性体
薄膜の保磁力より小さな逆磁場でも反転しそれを核とし
て磁壁移動により徐々に反転磁化部分が広がることに起
因している。本発明者等は磁性体薄膜に印加される外部
磁場が磁性体薄膜の保磁力の１／３以下であれば記録情
報は長時間に亘り安定であることを確認している。When the recording magnetic substance thin film 2 is made of the rare earth-iron type amorphous magnetic substance, an external magnetic field is applied to the recording magnetic substance thin film 2.
It has been found that even if the coercive force is smaller than the coercive force of the above, if it is applied to the recording magnetic thin film 2 for a long time, the recorded information deteriorates at room temperature. For example, the coercive force is 0.
300k in the direction of the recording bit magnetization on the 6kOe GdTbDyFe film
It was found that when the magnetic field of e was applied and left for 48 to 72 hours, the recording bit diameter increased, and conversely, when the magnetic field of 300 Oe was applied in the direction opposite to the magnetization of the recording bit and left, the recording bit diameter decreased. . The instability phenomenon of the recorded information is caused by the fact that the magnetization of the micro-defects of the magnetic thin film is reversed even in the reverse magnetic field smaller than the coercive force of the magnetic thin film, and the reversal magnetization gradually expands due to the domain wall movement. ing. The present inventors have confirmed that the recorded information is stable for a long time if the external magnetic field applied to the magnetic thin film is 1/3 or less of the coercive force of the magnetic thin film.
又磁性体薄膜の保磁力は温度に応じて変化し、希土類−
鉄系非晶質磁性体薄膜では第３図に示すような特性を有
する。同図においてＴcompは補償点、Tcはキューリ点で
ある。同図のように磁性体薄膜の保磁力は温度に応じて
大きく変化し例えば室温が１０℃程度上昇変化すると保
磁力が半分程度に落ちることもある。従って希土類−鉄
系非晶質磁性体薄膜によって記録媒体を構成する場合は
室温の状態に注意して使用されなければならない事が判
る。In addition, the coercive force of the magnetic thin film changes depending on the temperature.
The iron-based amorphous magnetic thin film has the characteristics shown in FIG. In the figure, T comp is a compensation point and T c is a Curie point. As shown in the figure, the coercive force of the magnetic thin film changes greatly depending on the temperature. For example, if the room temperature rises by about 10 ° C., the coercive force may drop to about half. Therefore, it is understood that when a recording medium is composed of a rare earth-iron-based amorphous magnetic thin film, it must be used with care at room temperature.
以上の点を整理すると希土類−鉄系非晶質磁性体薄膜を
記録媒体とした場合記録及び消去用磁場は次の諸点に注
意して設計しなければならなくなる。Summarizing the above points, when a rare earth-iron-based amorphous magnetic thin film is used as a recording medium, the recording and erasing magnetic fields must be designed with attention to the following points.
記録磁場と消去磁場を互いに逆向きに発生させるこ
と。To generate a recording magnetic field and an erasing magnetic field in opposite directions.
記憶磁場は消去磁場より小さな磁場であること。The memory magnetic field must be smaller than the erase magnetic field.
消去磁場は記録媒体の保磁力の1/3以下であること。The erasing magnetic field must be 1/3 or less of the coercive force of the recording medium.
〈目的〉 本発明は以上の諸点を考慮してなされたものでありＧ
ｄ、Ｔｂ、Ｄｙの少なくとも一種とＦｅとを含む非晶質
磁性体薄膜を記録媒体とした場合に最適な外部磁場の印
加が可能な熱磁気記録装置を提供するとともに、装置温
度が記録媒体の安定域を越えた場合に記録媒体が外部磁
場印加用の永久磁石の影響を受けることがない熱磁気記
録装置を提供することを目的とする。<Purpose> The present invention has been made in consideration of the above points.
Provided is a thermomagnetic recording device capable of applying an optimum external magnetic field when an amorphous magnetic thin film containing at least one of d, Tb, and Dy and Fe is used as a recording medium. An object of the present invention is to provide a thermomagnetic recording device in which a recording medium is not affected by a permanent magnet for applying an external magnetic field when it exceeds the stable region.
〈実施例〉 以下本発明に係る熱磁気記録装置の一実施例について詳
細に説明を行なう。<Example> An example of the thermomagnetic recording apparatus according to the present invention will be described in detail below.
第４図は本発明に係る熱磁気記録装置の一実施例の要部
説明図である。８は基板上に希土類−鉄系非晶質磁性体
薄膜を形成してなる光磁気ディスク、９は該光磁気ディ
スクを回転駆動するモータである。上記希土類−鉄系非
晶質磁性体薄膜は同図のＡとＢの間の部分（該部分の長
さを有効半径という）に形成される。１０は強い磁場を
発生する消去用永久磁石であり１１は弱い磁場を発生す
る記録用永久磁石である。この消去用磁石１０は磁石ホ
ルダー１２の表側に、記録用磁石１１は裏側に設けられ
ている。但し上記磁石ホルダー１２はステッピングモー
タ１３により回転可能であり、上記消去用磁石１０と上
記記録用磁石１１は互いに位置を逆転することができ
る。１４は上記磁石ホルダー１２に対して固着される円
板であり、該円板の適切な個所に穴が形成される。１５
はフォトカプラを内在する位置センサーであり上記円板
１４の回転時に上記穴を上記フォトカプラによって読み
取り、該読み取りにより上記消去用磁石10及び上記記録
用磁石１１の位置を認識する。上記消去用磁石１０及び
記録用磁石１１は上記光磁気ディスク８の磁性体薄膜の
有効半径より長い棒状体を形成しているので、光学ヘッ
ド（図示せず）の光磁気ディスク半径方向への移動と共
に上記消去用磁石１０及び記録用磁石１１を連動する必
要が無く従って外部磁場を付与する為の機構は簡略なも
のになっている。同図でＣは光学ヘッドのレーザ光照射
方向を示している。１６は支持板であり、軸１７を介し
て上記ステッピングモータ１３を支持している。ステッ
ピングモータ１３は上記軸を中心にして矢印Ｄの方向に
回転できる機構を備え、装置温度が記録媒体の安定域を
越えた時或いは電源が切られた時には自動的に矢印Ｄ方
向に回転して上記消去用磁石１０及び記録用磁石１１を
記録媒体から遠ざける様にしている。こうして記録媒体
に記録された情報が上記消去用磁石１０及び記録用磁石
１１によって乱される事の無い機構となっている。FIG. 4 is an explanatory view of essential parts of an embodiment of the thermomagnetic recording apparatus according to the present invention. Reference numeral 8 is a magneto-optical disk formed by forming a rare earth-iron-based amorphous magnetic thin film on a substrate, and 9 is a motor for rotationally driving the magneto-optical disk. The rare earth-iron-based amorphous magnetic thin film is formed in the portion between A and B in the figure (the length of the portion is referred to as the effective radius). Reference numeral 10 is an erasing permanent magnet that generates a strong magnetic field, and 11 is a recording permanent magnet that generates a weak magnetic field. The erasing magnet 10 is provided on the front side of the magnet holder 12, and the recording magnet 11 is provided on the back side. However, the magnet holder 12 can be rotated by a stepping motor 13, and the erasing magnet 10 and the recording magnet 11 can reverse their positions. Reference numeral 14 is a disk fixed to the magnet holder 12, and holes are formed at appropriate places on the disk. 15
Is a position sensor having a photocoupler therein. The hole is read by the photocoupler when the disk 14 is rotated, and the positions of the erasing magnet 10 and the recording magnet 11 are recognized by the reading. Since the erasing magnet 10 and the recording magnet 11 form a rod-shaped body longer than the effective radius of the magnetic thin film of the magneto-optical disk 8, movement of the optical head (not shown) in the radial direction of the magneto-optical disk. At the same time, it is not necessary to interlock the erasing magnet 10 and the recording magnet 11, and therefore the mechanism for applying the external magnetic field is simple. In the figure, C indicates the laser light irradiation direction of the optical head. Reference numeral 16 denotes a support plate, which supports the stepping motor 13 via a shaft 17. The stepping motor 13 is provided with a mechanism capable of rotating in the direction of arrow D about the above-mentioned axis, and automatically rotates in the direction of arrow D when the device temperature exceeds the stable range of the recording medium or the power is turned off. The erasing magnet 10 and the recording magnet 11 are kept away from the recording medium. Thus, the mechanism is such that the information recorded on the recording medium is not disturbed by the erasing magnet 10 and the recording magnet 11.
〈効果〉 以上説明したように、本発明によればＧｄ、Ｔｂ、Ｄｙ
の少なくとも一種とＦｅとを含む非晶質磁性体薄膜を記
録媒体とした場合に最適な外部磁場の印加が可能である
とともに情報の記録状態の安定した熱磁気記録装置を提
供することができるだけでなく、装置の温度が記録媒体
の安定域を越えた場合に記録媒体が外部磁場印加用の永
久磁石の影響を受けることがない熱磁気記録装置を提供
することができる。<Effect> As described above, according to the present invention, Gd, Tb, Dy
When an amorphous magnetic thin film containing at least one of Fe and Fe is used as a recording medium, it is possible to provide an optimum external magnetic field and to provide a thermomagnetic recording device in which a recorded state of information is stable. In addition, it is possible to provide a thermomagnetic recording apparatus in which the recording medium is not affected by the permanent magnet for applying an external magnetic field when the temperature of the apparatus exceeds the stable region of the recording medium.
第１図は従来の熱磁気記録方式の一例を示す説明図、第
２図は従来の熱磁気記録方式の他の例を示す説明図、第
３図は希土類−鉄系非晶質磁性体薄膜の温度−保持力特
性のグラフ図、第４図は本発明に係る熱磁気記録装置の
一実施例の要部説明図を示す。 図中、１：透明基板、２：記録磁性体薄膜、３：保護
板、４：レーザ光、５：集光レンズ、６：コイル、７：
永久磁石、８：光磁気ディスク、９：モータ、１０：消
去用永久磁石、１１：記録用永久磁石、１２：磁石ホル
ダー、１３：ステッピングモータ、１４：円板、１５：
位置センサー、１６：支持板、１７：軸FIG. 1 is an explanatory diagram showing an example of a conventional thermomagnetic recording system, FIG. 2 is an explanatory diagram showing another example of a conventional thermomagnetic recording system, and FIG. 3 is a rare earth-iron-based amorphous magnetic thin film. FIG. 4 is a graph showing the temperature-coercive force characteristic of FIG. 4, and FIG. In the figure, 1: transparent substrate, 2: recording magnetic thin film, 3: protective plate, 4: laser light, 5: condenser lens, 6: coil, 7:
Permanent magnets, 8: magneto-optical disk, 9: motor, 10: permanent magnet for erasing, 11: permanent magnet for recording, 12: magnet holder, 13: stepping motor, 14: disc, 15:
Position sensor, 16: support plate, 17: axis
───────────────────────────────────────────────────── フロントページの続き (72)発明者 出口 敏久 大阪府大阪市阿倍野区長池町22番22号 シ ヤ−プ株式会社内 (72)発明者 日向 尊夫 大阪府大阪市阿倍野区長池町22番22号 シ ヤ−プ株式会社内 (72)発明者 山岡 秀嘉 大阪府大阪市阿倍野区長池町22番22号 シ ヤ−プ株式会社内 (56)参考文献 特開 昭56−61054（ＪＰ，Ａ) 特開 昭57−24046（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihisa Exit 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation (72) Takao Hinata 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within the Sharp Corporation (72) Inventor Hideyoshi Yamaoka 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture Within the Sharp Corporation (56) Reference JP-A-56-61054 (JP, A) Kai 57-24046 (JP, A)
Claims (2)
ｂ、Ｄｙの少なくとも一種とＦｅとを含む非晶質磁性体
薄膜を記録媒体とし、前記記録媒体に補助磁場を供給す
る回転可能な永久磁石を備え、前記記録媒体への記録時
と消去時とで磁場の大きさを切り替えるために前記永久
磁石を回転し、前記記録媒体に対するレーザ光による加
熱によって情報の記録と消去とを行う熱磁気記録装置に
おいて、 前記永久磁石は前記記録媒体の半径方向に長手方向が沿
うように配され、かつ、前記長手方向の長さが前記記録
媒体の有効半径より長い棒状体を成し、かつ、情報の消
去時に前記永久磁石により前記記録媒体に供給される磁
場の大きさが前記記録媒体の保磁力の１／３以下である
ことを特徴とする熱磁気記録装置。1. A Gd, T having an easy axis of magnetization perpendicular to the film surface.
An amorphous magnetic thin film containing at least one of b and Dy and Fe is used as a recording medium, a rotatable permanent magnet for supplying an auxiliary magnetic field to the recording medium is provided, and recording and erasing are performed on the recording medium. In the thermomagnetic recording device that rotates the permanent magnet to switch the magnitude of the magnetic field, and records and erases information by heating the recording medium with a laser beam, the permanent magnet is arranged in a radial direction of the recording medium. A magnetic field that is arranged so that the longitudinal direction is along, and that forms a rod-shaped body whose length in the longitudinal direction is longer than the effective radius of the recording medium, and which is supplied to the recording medium by the permanent magnet when erasing information. Is less than 1/3 of the coercive force of the recording medium.
膜を記録媒体とし、該記録媒体への記録時及び消去時に
外部より前記記録媒体に補助磁場を供給する永久磁石を
配設し、該記録媒体に対するレーザ光による加熱によっ
て情報の記録と消去とを行う熱磁気記録装置において、
装置温度が前記記録媒体の安定域を越えた時に前記永久
磁石を前記記録媒体から離間せしめる手段を備えたこと
を特徴とする熱磁気記録装置。2. A magnetic thin film having an easy axis of magnetization perpendicular to the film surface is used as a recording medium, and a permanent magnet is provided for externally supplying an auxiliary magnetic field to the recording medium during recording and erasing on the recording medium. A thermomagnetic recording device for recording and erasing information by heating the recording medium with a laser beam,
A thermomagnetic recording apparatus comprising means for separating the permanent magnet from the recording medium when the apparatus temperature exceeds a stable region of the recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57165881A JPH0636241B2 (en) | 1982-09-21 | 1982-09-21 | Thermomagnetic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57165881A JPH0636241B2 (en) | 1982-09-21 | 1982-09-21 | Thermomagnetic recording device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4104338A Division JP2813266B2 (en) | 1992-04-23 | 1992-04-23 | Thermomagnetic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5954003A JPS5954003A (en) | 1984-03-28 |
| JPH0636241B2 true JPH0636241B2 (en) | 1994-05-11 |
Family
ID=15820747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57165881A Expired - Lifetime JPH0636241B2 (en) | 1982-09-21 | 1982-09-21 | Thermomagnetic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636241B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06105483B2 (en) * | 1985-05-15 | 1994-12-21 | オリンパス光学工業株式会社 | Bias magnetic field applying device for magneto-optical recording |
| JPS6212308U (en) * | 1985-07-05 | 1987-01-26 | ||
| JPS6392281A (en) * | 1986-10-06 | 1988-04-22 | Sharp Corp | Auxiliary magnetic field positioning device |
| US4984225A (en) * | 1987-03-31 | 1991-01-08 | Kabushiki Kaisha Toshiba | System for applying magnetic field to opto-magnetic memory |
| JPH0661122B2 (en) * | 1987-05-08 | 1994-08-10 | シャープ株式会社 | Magneto-optical disk device |
| JPH0272402U (en) * | 1988-11-16 | 1990-06-01 | ||
| JPH0636481Y2 (en) * | 1989-02-13 | 1994-09-21 | ティアツク株式会社 | Bias magnetic field applying device for magneto-optical disk device |
| US5229983A (en) * | 1989-12-28 | 1993-07-20 | Matsushita Electric Industrial Co., Ltd. | Bias magnetic field generating apparatus for magneto-optical recording and reproducing system |
| JP2813266B2 (en) * | 1992-04-23 | 1998-10-22 | シャープ株式会社 | Thermomagnetic recording device |
| CN110186843B (en) * | 2019-04-24 | 2020-03-20 | 中国矿业大学 | Device and method for measuring effective influence radius of high-pressure medium injected into drill hole |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724046A (en) * | 1980-07-16 | 1982-02-08 | Matsushita Electric Ind Co Ltd | Photoelectric recording medium and its recorer and reproducer |
| JPS5661054A (en) * | 1980-10-06 | 1981-05-26 | Teac Co | Recording and reproducing device |
-
1982
- 1982-09-21 JP JP57165881A patent/JPH0636241B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5954003A (en) | 1984-03-28 |
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