JPH0325854B2 - - Google Patents
Info
- Publication number
- JPH0325854B2 JPH0325854B2 JP6988581A JP6988581A JPH0325854B2 JP H0325854 B2 JPH0325854 B2 JP H0325854B2 JP 6988581 A JP6988581 A JP 6988581A JP 6988581 A JP6988581 A JP 6988581A JP H0325854 B2 JPH0325854 B2 JP H0325854B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- magnetic
- recording medium
- perpendicular magnetic
- recording
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 239000010409 thin film Substances 0.000 description 8
- 239000010408 film Substances 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- G11B11/10502—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 characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/10506—Recording by modulating only the light beam of the transducer
-
- 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
- G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
- G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
本発明は、高密度垂直熱磁気記録・再生方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-density perpendicular thermomagnetic recording and reproducing method.
従来、磁気記録において、磁気記録密度を向上
させるには、磁気記録させたビツトパターン寸法
を小さくすることが必須の条件であるが、前記ビ
ツトパターンの間隔λを小さくすれば、これに比
例して磁気ヘツドと磁気記録媒体の間隔δを小さ
くしなければならないという法則がある。これ
は、小さな磁石の磁力線が磁石の寸法に比例して
遠くに及ぶからである。したがつて、前記ビツト
パターンの間隔λ、磁気ヘツドと磁気記録媒体の
間隔δ及び磁気ヘツドの読み取り出力電気信号の
レベルD(デシベル)の間に次の式が成立する。 Conventionally, in magnetic recording, in order to improve the magnetic recording density, it is essential to reduce the size of the magnetically recorded bit patterns, but if the interval λ of the bit patterns is reduced, the There is a law that states that the distance δ between the magnetic head and the magnetic recording medium must be made small. This is because the magnetic field lines of a small magnet extend farther in proportion to the size of the magnet. Therefore, the following equation holds between the interval λ between the bit patterns, the interval δ between the magnetic head and the magnetic recording medium, and the level D (decibel) of the read output electrical signal of the magnetic head.
D≒−55δ/λ (デシベル:dB) ……(1)
この式(1)からわかるように、読み取り出力電気
信号のレベルDは、磁気ヘツドと磁気記録媒体の
間隔δが零(磁気ヘツドが磁気記録媒体と密着し
ている場合)の出力電気信号に対して、その間隔
δの値がAの時はその値より何デシベルか減少す
る。例えば、ビツトパターン間隔λが1μmのと
き、磁気ヘツドと磁気記録媒体の間隔δの値が
0.4μmであるとしても、この減少の値は22デシベ
ルとなり、約1/10の出力電圧が減少することにな
る。そこで、この磁気ヘツドの出力電圧を減少さ
せないためには、δ/λの値を0.2〜0.4位に保持
しなければらない。 D≒-55δ/λ (decibel: dB) ...(1) As can be seen from this equation (1), the level D of the read output electrical signal is determined when the distance δ between the magnetic head and the magnetic recording medium is zero (the magnetic head is When the value of the interval δ is A, the output electric signal (when the magnetic recording medium is in close contact with the magnetic recording medium) is reduced by some decibels from that value. For example, when the bit pattern spacing λ is 1 μm, the value of the spacing δ between the magnetic head and the magnetic recording medium is
Even if it were 0.4 μm, the value of this reduction would be 22 decibels, which would reduce the output voltage by about 1/10. Therefore, in order not to reduce the output voltage of this magnetic head, the value of δ/λ must be maintained at about 0.2 to 0.4.
第1図は、前記原理に基づいてなされた従来の
垂直磁気記録ヘツドの構成を示す図であり、Co
−Cr薄膜、Mn−Bi薄膜及びTb−Fe薄膜、Gd−
Fe薄膜、Dy−Fe薄膜遠の希土類−遷移金属系ア
モルフアス磁性薄膜を基板上に蒸着、スパツタリ
ング等で形成した垂直磁気記録媒体Mに、情報を
垂直磁気記録及び再生を行うための磁気ヘツドで
ある。この磁気ヘツドはパーマロイストリツプ1
の周囲をプラスチツク材のような保護材2で覆つ
た主磁極3と、その主磁極3と前記垂直磁気記録
媒体Mを介在して対向する高透磁率のフエライト
材にコイル4を設けてなる補助磁極5を設けたも
のである。 FIG. 1 is a diagram showing the configuration of a conventional perpendicular magnetic recording head based on the above principle.
-Cr thin film, Mn-Bi thin film, Tb-Fe thin film, Gd-
This is a magnetic head for performing perpendicular magnetic recording and reproduction of information on a perpendicular magnetic recording medium M in which a rare earth-transition metal-based amorphous magnetic thin film such as Fe thin film or Dy-Fe thin film is formed on a substrate by vapor deposition, sputtering, etc. . This magnetic head has permalloy strip 1
A main magnetic pole 3 whose periphery is covered with a protective material 2 such as a plastic material, and an auxiliary coil 4 formed of a high magnetic permeability ferrite material facing the main magnetic pole 3 with the perpendicular magnetic recording medium M interposed therebetween. A magnetic pole 5 is provided.
第2図は、第1図のものと同様に高密度磁気記
録のための従来の垂直熱(光)磁気記録方法(加
熱する手段としてレーザービーム等を使用するの
で光磁気記録方法とも呼ぶ)を説明するための図
であり、垂直磁気記録媒体Mに情報に応じて記録
用レーザー装置6からのレーザービームを、集光
レンズ7で集光させて照射し、前記垂直磁気記録
媒体Mの温度をキユリー点まで上げることにより
その保磁力を低下させ、コイル8からの外部磁界
によりその磁界方向に磁気モーメントを反転させ
て情報を記録する方法である。 Figure 2 shows the conventional perpendicular thermo(optical) magnetic recording method (also called magneto-optical recording method as it uses a laser beam etc. as a heating means) for high-density magnetic recording, similar to the one in Figure 1. This is a diagram for explaining the temperature of the perpendicular magnetic recording medium M by irradiating the perpendicular magnetic recording medium M with a laser beam from the recording laser device 6 in accordance with the information and condensing it with a condensing lens 7. This is a method of recording information by lowering the coercive force by raising the magnetic field to the Curie point, and reversing the magnetic moment in the direction of the magnetic field using an external magnetic field from the coil 8.
前記、第1図の磁気ヘツドによる従来の高密度
磁気記録方法では、垂直磁気記録媒体Mと磁気ヘ
ツドとの間のギヤツプの維持及び接触部分の摩耗
等の問題があつた。 The conventional high-density magnetic recording method using the magnetic head shown in FIG. 1 has problems such as maintaining a gap between the perpendicular magnetic recording medium M and the magnetic head and wearing out the contact portion.
また、前記第2図の垂直磁気記録方法では、レ
ーザービーム等の熱線のスポツトの回折現象等に
より熱線の波長以下には小さくできないため、高
密度の磁気記録にも限界があつた。 Further, in the perpendicular magnetic recording method shown in FIG. 2, there is a limit to high-density magnetic recording because it cannot be made smaller than the wavelength of the heat ray due to the diffraction phenomenon of the spot of the heat ray such as a laser beam.
また、磁気光学効果、特にカー効果の大きい材
料がないので、再生時のS/Nが悪い等の問題が
あつた。 Furthermore, since there is no material with a large magneto-optical effect, particularly the Kerr effect, there are problems such as poor S/N during reproduction.
本発明の目的は、前記問題を解消し、磁気ヘツ
ドの摩耗や熱線スポツトの回折現象等による制限
を受けることなく、高密度の磁気記録を可能に
し、S/Nのよい再生を行う垂直熱磁気記録・再
生方法を提供することにある。 The purpose of the present invention is to solve the above-mentioned problems by providing a vertical thermomagnetic device that enables high-density magnetic recording and reproduction with a good S/N ratio without being limited by magnetic head wear or the diffraction phenomenon of hot ray spots. The objective is to provide a recording/playback method.
本発明は、前記目的を達成するためになされた
ものであり、その特徴は、垂直磁気記録媒体の記
録層にキユリー点以上のスポツト状加熱領域を移
動させ、所定の加熱領域がその移動によつて生じ
る移動加熱領域との間に充分な重畳領域を持ち、
かつ前記移動加熱領域以外の前記所定の加熱領域
がキユリー点にまで温度降下の生じた時点で書き
込みコイルにより発生された磁界の方向に磁化し
て前記記録層に記録をし、情報が記録された前記
垂直磁気記録媒体の記録層に三日月状又は半月状
のスポツトを照射して磁気光学効果により前記記
録情報を読みだすようにするものである。 The present invention has been made to achieve the above object, and is characterized in that a spot-shaped heating area of a temperature higher than the Curie point is moved in the recording layer of a perpendicular magnetic recording medium, and a predetermined heating area is heated by the movement. It has a sufficient overlap area between the moving heating area that occurs when
and the predetermined heating area other than the moving heating area is magnetized in the direction of the magnetic field generated by the writing coil when the temperature drops to the Curie point, and information is recorded on the recording layer. The recording layer of the perpendicular magnetic recording medium is irradiated with a crescent-shaped or half-moon-shaped spot to read out the recorded information using the magneto-optical effect.
以下、実施例により本発明を詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
第3図は、本発明が適用される記録ヘツドの一
実施例の概略構成を示す図である。 FIG. 3 is a diagram showing a schematic configuration of an embodiment of a recording head to which the present invention is applied.
図において、11は半導体レーザー等の熱線源
であり、連続的に発光するものである。12はこ
の熱線源11から放射されるレーザー光等の熱線
を集光するレンズ系、13はその膜面に垂直方向
に磁化しやすい(垂直磁気異方向)垂直磁気記録
媒体であり、矢印方向に高速移動可能に配設され
ている。14はバイアス磁界を制御するコイル、
15はコイル14に情報に対応した電流を流すた
めの信号源である。 In the figure, 11 is a heat ray source such as a semiconductor laser, which continuously emits light. 12 is a lens system that condenses heat rays such as laser light emitted from the heat ray source 11, and 13 is a perpendicular magnetic recording medium that is easily magnetized in the direction perpendicular to its film surface (perpendicular magnetic different direction). It is arranged to allow high-speed movement. 14 is a coil that controls the bias magnetic field;
15 is a signal source for causing a current corresponding to information to flow through the coil 14.
前記垂直磁気記録媒体13はキユリー点Tcの
低いもの(最低70℃位)が良く、Mn−Biの薄膜
及び重希土類−遷移金属系のTb−Fe−、Gd−
Fe、Dy−Fe、Gd−Co、Ho−Co等のアモルフア
ス薄膜等で構成される。また、その保磁力Hcは、
キユリー点Tcよりやや下位から急速に減少する。 The perpendicular magnetic recording medium 13 preferably has a low Curie point Tc (minimum 70°C), and is preferably a thin film of Mn-Bi or a heavy rare earth-transition metal based Tb-Fe-, Gd-
It is composed of amorphous thin films such as Fe, Dy-Fe, Gd-Co, and Ho-Co. Also, its coercive force Hc is
It decreases rapidly from slightly below the Kyrie point Tc.
第4図は、第3図に示す前記垂直磁気記録媒体
13上の熱線スポツトが照射されている位置P点
の拡大図であり、実線の円ロは垂直磁気記録媒体
13上に熱線スポツトが照射されている位置P点
を示し、点線の円イは移動後のP点を示してい
る。 FIG. 4 is an enlarged view of the position P where the heat ray spot is irradiated on the perpendicular magnetic recording medium 13 shown in FIG. The dotted line circle A shows the P point after the movement.
次に、本実施例の記録ヘツドの動作を説明す
る。 Next, the operation of the recording head of this embodiment will be explained.
前記垂直磁気記録媒体13が矢印方向に高速度
で移動しているとし、P点の矢印方向の移動距離
をxとし、熱線源11から熱線が照射されている
とすると、Δt秒後には、第4図の実線の円ロで
示される熱線スポツト部分(キユリー点以上に加
熱されている部分)は、矢印と逆の方向にΔxだ
け移動し、点線イの円で示される位置にくる。し
たがつて、斜線を施した部分ハは熱線照射による
加熱を受けなくなり、急速に温度が低下し、キユ
リー点以下に降下して行く。ここで、第3図に示
すように、前記コイル14に流れる電流による磁
界が、垂直磁気記録媒体13の前記斜線を施した
部分ハにも印加されているので、前記斜線を施し
た部分ハはキユリー点附近で一旦保磁力Hcが極
めて低い状態を通過し、この時コイル14から受
けた磁界の方向に磁化される。前記垂直磁気記録
媒体13の保磁力Hcは、キユリー点から遠ざか
り室温に近づくと急速に増大するため、前記斜線
を施した部分ハの磁化方向は、その後コイル14
からの磁界が逆転しても反転することなく保持さ
れる。 Assuming that the perpendicular magnetic recording medium 13 is moving at a high speed in the direction of the arrow, the moving distance of point P in the direction of the arrow is x, and the heat ray source 11 is irradiating the heat ray, after Δt seconds, the The hot ray spot portion (the portion heated above the Curie point) indicated by the solid line circle (R) in Figure 4 moves by Δx in the opposite direction to the arrow and comes to the position indicated by the dotted circle (A). Therefore, the shaded area C is no longer heated by the heat ray irradiation, and its temperature rapidly decreases to below the Curie point. Here, as shown in FIG. 3, the magnetic field due to the current flowing through the coil 14 is also applied to the hatched portion C of the perpendicular magnetic recording medium 13, so the hatched portion C is Near the Curie point, the coercive force Hc once passes through a state where it is extremely low, and at this time it is magnetized in the direction of the magnetic field received from the coil 14. Since the coercive force Hc of the perpendicular magnetic recording medium 13 increases rapidly as it moves away from the Curie point and approaches room temperature, the magnetization direction of the shaded portion C will then change to the coil 14.
It is maintained without reversing even if the magnetic field from
このようにして、第5図Aに示すように、垂直
磁気記録媒体13の上に順次三日月状の磁化され
た磁気記録パターンが形成される。第5図Aの斜
線を施された部分の磁化は紙面の表方向に向いて
おり、斜線を施していない部分は裏方向に向いて
いる。この磁化状態を記録トラツクの中央(x軸
線上)に沿つて示すと、第5図Bのよのになる。 In this way, as shown in FIG. 5A, a crescent-shaped magnetized magnetic recording pattern is sequentially formed on the perpendicular magnetic recording medium 13. The magnetization of the shaded portion in FIG. 5A is directed toward the front of the paper, and the magnetization of the non-hatched portion is directed toward the back. If this magnetization state is shown along the center of the recording track (on the x-axis), it will be as shown in FIG. 5B.
前記三日月状の磁気記録パターンは、熱線スポ
ツトの径よりはるかに微細な記録パターンになる
ことが前述の説明からわかるであろう。 It will be understood from the above description that the crescent-shaped magnetic recording pattern is much finer than the diameter of the hot ray spot.
なお、本発明の熱線の照射手段、磁界の印加手
段は、本実施例に限定されることなく、所定の機
能を有するものであれば、どのような手段であつ
てもよい。 Note that the heat ray irradiation means and magnetic field application means of the present invention are not limited to the present embodiment, and may be any means as long as they have a predetermined function.
第6図は、本発明の再生ヘツドの一実施例を説
明するための図であり、第3図と同一の機能を有
するものは同一記号を付けてある。 FIG. 6 is a diagram for explaining one embodiment of the reproducing head of the present invention, and parts having the same functions as those in FIG. 3 are given the same symbols.
図において、16は記録されている磁気パター
ンと同形、第7図に示すように、熱線スポツトの
一部が三日月状若しくは半月状になるように構成
され、フイルタ16のA部は熱線を透過せず、B
部のみ透過するようになつている。17は偏光
子、18はハーフミラー、19は検光子、20は
光電変換装置である。 In the figure, 16 is of the same shape as the recorded magnetic pattern, and as shown in FIG. Zu, B
Only part of the screen is transparent. 17 is a polarizer, 18 is a half mirror, 19 is an analyzer, and 20 is a photoelectric conversion device.
前記垂直磁気記録媒体13に記録されている情
報を読出す方法は、第7図に示すように、半導体
レーザー等の熱線源11からの熱線スポツトを、
垂直磁気記録媒体13の磁性膜上で記録パターン
と同じ三日月状のパターンとなるようにフイルタ
16を通して変形し、この変形された熱線スポツ
トを偏光子17を通し直線偏光にして、ハーフミ
ラー18、集光レンズ系12を介して前記磁性膜
上に集光させる。このとき、磁性膜は磁気光学効
果を示すため、磁性膜からの反射熱線は、偏光面
の回転を生じており、これを検光子19及び光電
変換装置20によつて検知されて読出される。 As shown in FIG. 7, a method for reading information recorded on the perpendicular magnetic recording medium 13 is to use a hot ray spot from a hot ray source 11 such as a semiconductor laser,
The hot ray spots are deformed through a filter 16 so as to form the same crescent-shaped pattern as the recording pattern on the magnetic film of the perpendicular magnetic recording medium 13, and the deformed hot ray spots are converted into linearly polarized light through a polarizer 17, and then collected by a half mirror 18. The light is focused onto the magnetic film through the optical lens system 12. At this time, since the magnetic film exhibits a magneto-optical effect, the reflected heat rays from the magnetic film cause a rotation of the plane of polarization, which is detected and read out by the analyzer 19 and the photoelectric conversion device 20.
読出す場合、照射熱線スポツトの形状を記録パ
ターンと同じパターンを磁性膜に照射しなくても
良いが、読出しのS/Nを良くするために記録ト
ラツクの中央部、即ちx軸線上の記録パターンの
大きさを確実に検知するようにしておく必要があ
る。 When reading, it is not necessary to irradiate the magnetic film with the same shape of the irradiation heat ray spot as the recording pattern, but in order to improve the S/N of reading, the recording pattern is set in the center of the recording track, that is, on the x-axis line. It is necessary to reliably detect the size of
なお、本発明の磁界の印加手段、フイルタのパ
ターンの形は、前記実施例に限定されることな
く、所定の機能を有するものであれば、どのよう
なものであつてもよい。 また、前記第3図の記
録用熱線供給系と第6図の再生用熱線供給系を兼
用してもよい。 Note that the shape of the pattern of the magnetic field applying means and filter of the present invention is not limited to the above embodiments, but may be of any shape as long as it has a predetermined function. Further, the recording heat ray supply system shown in FIG. 3 and the reproduction heat ray supply system shown in FIG. 6 may be used together.
以上説明したように、本発明によれば、磁気ヘ
ツドの摩耗や熱線スポツトの回折現象等による制
限を受けることなく、高密度の磁気記録を可能に
し、かつ、S/Nの良い再生を行うことができ
る。 As explained above, according to the present invention, it is possible to perform high-density magnetic recording and to perform reproduction with a good S/N ratio without being limited by the wear of the magnetic head or the diffraction phenomenon of hot ray spots. Can be done.
第1図は、従来の垂直磁気記録ヘツドの構成を
示す図、第2図は、従来の垂直熱磁気記録方法を
説明するための図、第3図は、本発明の記録ヘツ
ドの一実施例の概略構成を示す図、第4図は、第
3図に示す垂直磁気記録媒体上の熱線スポツトが
照射されている位置P点の拡大図、第5図は、本
実施例による磁気記録の状態を示す図、第6図
は、本発明の再生ヘツドの一実施例の概略構成を
示す図、第7図は、第6図のフイルタの形を説明
するための図である。
11……熱線源、12……集光レンズ系、13
……垂直磁気記録媒体、14……コイル、15…
…信号源、16……フイルタ、17……偏光子、
18……ハーフミラー、19……検光子、20…
…光電変換装置。
FIG. 1 is a diagram showing the configuration of a conventional perpendicular magnetic recording head, FIG. 2 is a diagram for explaining a conventional perpendicular thermomagnetic recording method, and FIG. 3 is an embodiment of the recording head of the present invention. FIG. 4 is an enlarged view of point P, which is irradiated with the hot ray spot on the perpendicular magnetic recording medium shown in FIG. 3, and FIG. 5 is a diagram showing the state of magnetic recording according to this embodiment. 6 is a diagram showing a schematic configuration of an embodiment of the reproducing head of the present invention, and FIG. 7 is a diagram for explaining the shape of the filter shown in FIG. 6. 11... Heat ray source, 12... Condensing lens system, 13
...Perpendicular magnetic recording medium, 14... Coil, 15...
...Signal source, 16...Filter, 17...Polarizer,
18...half mirror, 19...analyzer, 20...
...Photoelectric conversion device.
Claims (1)
のスポツト状加熱領域を移動させ、所定の加熱領
域がその移動によつて生じる移動加熱領域との間
に充分な重畳領域を持ち、かつ前記移動加熱領域
以外の前記所定の加熱領域がキユリー点にまで温
度降下の生じた時点で書き込みコイルにより発生
された磁界の方向に磁化して前記記録層に記録を
し、情報が記録された前記垂直磁気記録媒体の記
録層に三日月状又は半月状のスポツトを照射して
磁気光学効果により前記記録情報を読みだすこと
を特徴とする垂直熱磁気記録・再生方法。1 A spot-like heating area having a temperature above the Curie point is moved in the recording layer of a perpendicular magnetic recording medium, and the predetermined heating area has a sufficient overlap area with the moving heating area generated by the movement, and the moving heating The perpendicular magnetic recording in which information is recorded in the recording layer by magnetizing in the direction of a magnetic field generated by a writing coil when the temperature of the predetermined heated area other than the heating area drops to the Curie point. 1. A perpendicular thermomagnetic recording and reproducing method, characterized in that the recorded information is read out by a magneto-optical effect by irradiating a crescent-shaped or half-moon-shaped spot onto a recording layer of a medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6988581A JPS57186248A (en) | 1981-05-09 | 1981-05-09 | Vertically thermomagnetic recording and reproducing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6988581A JPS57186248A (en) | 1981-05-09 | 1981-05-09 | Vertically thermomagnetic recording and reproducing system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57186248A JPS57186248A (en) | 1982-11-16 |
JPH0325854B2 true JPH0325854B2 (en) | 1991-04-09 |
Family
ID=13415644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6988581A Granted JPS57186248A (en) | 1981-05-09 | 1981-05-09 | Vertically thermomagnetic recording and reproducing system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57186248A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1439568A2 (en) | 2002-12-24 | 2004-07-21 | Lg Electronics Inc. | Bulb and electrodeless lamp system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57189302A (en) * | 1981-05-18 | 1982-11-20 | Fujitsu Ltd | Optical magnetic recording system |
US5161134A (en) * | 1989-06-29 | 1992-11-03 | Digital Equipment Corporation | Method for increasing linear bit density in magneto-optical storage media |
JPH03157843A (en) * | 1989-11-16 | 1991-07-05 | Sony Corp | Optical pickup device |
JP2838908B2 (en) * | 1990-10-19 | 1998-12-16 | キヤノン株式会社 | Magneto-optical recording method |
-
1981
- 1981-05-09 JP JP6988581A patent/JPS57186248A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1439568A2 (en) | 2002-12-24 | 2004-07-21 | Lg Electronics Inc. | Bulb and electrodeless lamp system |
Also Published As
Publication number | Publication date |
---|---|
JPS57186248A (en) | 1982-11-16 |
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