JPS60129950A - Photomagnetic recording medium - Google Patents

Photomagnetic recording medium

Info

Publication number
JPS60129950A
JPS60129950A JP23694583A JP23694583A JPS60129950A JP S60129950 A JPS60129950 A JP S60129950A JP 23694583 A JP23694583 A JP 23694583A JP 23694583 A JP23694583 A JP 23694583A JP S60129950 A JPS60129950 A JP S60129950A
Authority
JP
Japan
Prior art keywords
magnetic permeability
magnetic
recording medium
martensite
recording layer
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.)
Granted
Application number
JP23694583A
Other languages
Japanese (ja)
Other versions
JPH022222B2 (en
Inventor
Kazuma Ito
伊藤　一馬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seikosha KK
Original Assignee
Seikosha KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seikosha KK filed Critical Seikosha KK
Priority to JP23694583A priority Critical patent/JPS60129950A/en
Publication of JPS60129950A publication Critical patent/JPS60129950A/en
Publication of JPH022222B2 publication Critical patent/JPH022222B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor

Abstract

PURPOSE:To use an inexpensive material for a recording layer and to reduce cost by providing the recording layer of a material of which the magnetic permeability changed with phase transformation on a base plate consisting of a permanent magnet material. CONSTITUTION:A recording layer 3 is provided on a base plate 1 by using a a material of which the magnetic permeability changes with phase transformation. There is stainless steel of an austenite type having the compsn. range where induced martensite is generated by work strain as the material of which the magnetic permeability changes with the phase transformation. The state of the austenite material with the standard compsn. consisting of 18% Cr-18% Ni has about magnetic permeability mu=1.02 and is nearly non-magnetic but is the material is heated and quickly cooled, the material has the martensite compsn. and magnetism. If the material is therefore heated by using layer light 4, the heated part 5 is quickly cooled after the heating and is made into martensite. The magnetic permeability concentrates is made into martensite. The magnetic permeability concentrates only in this part and the magnetic flux increases. The increase in the magnetic density is detected and is read as a signal.

Description

【発明の詳細な説明】 この発明は磁気記録媒体に関するものである。[Detailed description of the invention] This invention relates to magnetic recording media.

従来知られている光磁気記録媒体は、基板上に記録＠全
形成し、この記録層材が）二ロ磁性を示す場合はキュリ
一点近傍での保磁力Ｈａの急激な低下を利用して、ンー
ザー光を用いて曹込み消去全行ない、フェリ磁性を示す
場合は補償点とキューり点の中間の低）（ｃ域を利用し
て書込み消去を行なっている。読み出しは、磁気カー効
果による直線偏光の偏光面の回転全利用しておこなう。Conventionally known magneto-optical recording media are formed entirely on a substrate, and when this recording layer material exhibits biromagnetism, the rapid decrease in coercive force Ha near the Curie point is utilized to The data is written and erased using the sensor light, and when ferrimagnetism is exhibited, writing and erasing is performed using the c region (low range between the compensation point and the cue point).Reading is performed using a straight line due to the magnetic Kerr effect. This is done by fully utilizing the rotation of the plane of polarization of polarized light.

しかし、上述の従来技術においては、フェロ磁性を示す
場合のキューり点近傍での書込みは不安定であるし、フ
ェリ磁性を示す場合の補償点利用の書込みにしても、こ
れら記録層用の材料としてこれまで用いられたチルＡ／
Ｔｅ　、テルビウムＴｂ。However, in the above-mentioned conventional technology, writing near the cue point when exhibiting ferromagnetism is unstable, and even when writing using the compensation point when exhibiting ferromagnetism, the material for these recording layers is unstable. Chill A/
Te, terbium Tb.

ガドリウムＧａなどは非常に高価なものである去いう一
欠点があった。One drawback of gadolinium Ga is that it is extremely expensive.

この発明は上述の従来技術における欠点を解決すること
を目的とするものである。The present invention aims to solve the above-mentioned drawbacks in the prior art.

つぎに実施例について説明する。Next, examples will be described.

基板１は永久磁石材料よりなるもので、ブロッビーディ
スクのようにｉＪ撓性が必要なものにあっては磁性プラ
スチック材を用いても、よい。この基板１は反磁界によ
る減磁を防ぐために、第１図示のように隣接するトラッ
ク２の磁化方向を互に反転させておく。これには垂直磁
化塑の記録方式でトラック毎に磁化しておく方法が有効
である。そのために基板１は垂直方向に異方性をもって
いることが望せしい。なおこのトラック毎の磁化方向の
反転はそのままトラッキングザーボ用の信号として用い
ることができる。The substrate 1 is made of a permanent magnetic material, and may be made of a magnetic plastic material in the case of a device such as a blobby disk that requires iJ flexibility. In order to prevent demagnetization due to a demagnetizing field, this substrate 1 has the magnetization directions of adjacent tracks 2 reversed as shown in the first diagram. For this purpose, it is effective to magnetize each track using a perpendicular magnetization plastic recording method. Therefore, it is desirable that the substrate 1 has anisotropy in the vertical direction. Note that this reversal of the magnetization direction for each track can be used as it is as a signal for tracking servo.

この基板１上に相変態によシ透磁率の変化する材料で記
録層３を設ける。この相変態により透磁率の変化１−る
材料としては、加工歪により肪起マンテンサイド’に生
ずる組成範囲のオーステナイト型のステンレス鋼がある
。標準組成が０ｒ１８％−Ｎ１８　％のものではオース
テナイト材状態では透磁率μ＝　１．０２程度でほとん
ど非磁性であるが、加熱急冷するとマルテンサイト組織
となり、磁性を帯びる。したがって、第１図でレーザ光
４を用いて加熱すると、加熱された部分５は次に急冷さ
扛てマルテンサイト化し、この部分だけ透磁率が急増し
、ここに磁束が集中し磁束密度が上昇するのでこれを検
出して信号として読み取る。検出の方法としては、光磁
気効果全利用するもののほか、垂直磁化型伝気ヘッドに
よるもの、さらにはホール素子、磁気抵抗効果素子など
による方法を用いることができる。記録を消去するには
、大きなビームで依然、徐冷丁れ・ばよい。A recording layer 3 is provided on this substrate 1 using a material whose magnetic permeability changes through phase transformation. An example of a material whose magnetic permeability changes due to this phase transformation is austenitic stainless steel, which has a composition range in which amorphous mantenside occurs due to processing strain. When the standard composition is 0R18%-N18%, the austenitic material has a magnetic permeability μ of about 1.02 and is almost non-magnetic, but when heated and rapidly cooled, it becomes a martensitic structure and becomes magnetic. Therefore, when heated using the laser beam 4 in Fig. 1, the heated portion 5 is then rapidly cooled and becomes martensite, the magnetic permeability of this portion increases rapidly, the magnetic flux is concentrated here, and the magnetic flux density increases. Therefore, this is detected and read as a signal. As a detection method, in addition to a method that makes full use of the magneto-optical effect, a method using a perpendicular magnetization type electric conduction head, a method using a Hall element, a magnetoresistive effect element, etc. can be used. To erase a record, you just need to slowly cool it down with a large beam.

第２図において、基板６上に高熱−７が設けらル、さら
にその上に記録層８が形成されている。In FIG. 2, a high temperature layer 7 is provided on a substrate 6, and a recording layer 8 is further formed thereon.

この実施例では、熱効率をあげ、−また基板５がキュリ
一点付近まで熱せられないように保つためにシリコン酸
化膜（Ｓｉ（ｈ）などの高熱層６ｆ、設けている。In this embodiment, a high heat layer 6f such as a silicon oxide film (Si(h)) is provided to increase thermal efficiency and to prevent the substrate 5 from being heated to near the Curie point.

上述の構成よシなる本発明にかかる光磁気記録媒体によ
れば記録層の材料に安価なものを用いることができるの
で、コストの低減を図ることができる。According to the magneto-optical recording medium according to the present invention having the above-described structure, an inexpensive material can be used for the recording layer, so that costs can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例の記録長方向に直焚する方向の
断面説明図、第２図はさらに他の実施例の断面説明図で
ある。 １・・・・・・基板、２・・・・・・トラック、６・・
・・・・記録層、６・・・・・・基板、７・・・・・・
蓄熱層、８・・・・・・記録層。 以上 出願人　株式会社精　工　舎 代理人　弁理士　最　上　務 第１図 第２図 手続補正書（自弁） 昭和５９　年７　月３０日 ２　発明の名称 光磁気記録媒体 ３　補正をづる者 事件との関係　特許出願人 東京都中央区京橋二丁目６番２１月 （２３８＞株式会社　精　工　舎 代表取締１ジ　横　山　１ＬＩＩ　− ４代理人 ・１０４東京都中央区京橋二丁目６番２１号株式会社服
部レイコー内５　補正の対象 明細用の発明の詳細な説明の欄 ６　補正の内容 （１）明細書第４頁第１０行 ［高熱層７」を、「蓄熱層７」と補正′する。 （２）同第４頁第１４行 ［高熱層６」を、［蓄熱層７」と補正する。 以　上FIG. 1 is an explanatory cross-sectional view of an embodiment of the present invention in the direction of direct firing in the recording length direction, and FIG. 2 is an explanatory cross-sectional diagram of still another embodiment. 1... Board, 2... Track, 6...
...Recording layer, 6...Substrate, 7...
Heat storage layer, 8... Recording layer. Applicant Seikosha Co., Ltd. Agent Patent Attorney Mogami Figure 1 Figure 2 Procedural Amendment (self-defense) July 30, 1980 2 Name of Invention Magneto-Optical Recording Medium 3 Related Patent Applicant: 21-6, Kyobashi, Chuo-ku, Tokyo REIKO 5 Detailed description of the invention column 6 for the specification subject to amendment Contents of amendment (1) [High heat layer 7] on page 4, line 10 of the specification is amended to read 'heat storage layer 7'. (2 ) "High heat layer 6" on page 4, line 14 is corrected to "heat storage layer 7".

Claims (4)

【特許請求の範囲】[Claims] （１）永久磁石材料よりなる基板上に、相変態により透
磁率の変化する材料で記録層を設けたことを特徴とする
光磁気記録媒体。(1) A magneto-optical recording medium characterized in that a recording layer made of a material whose magnetic permeability changes through phase transformation is provided on a substrate made of a permanent magnetic material. （２）上記記録層は加工歪により誘起マルテンサイｌ−
に生ずる組成範囲のオーステナイト型のステンレス鋼よ
りなる特許請求の範囲第１項の光磁気記録媒体。(2) The above-mentioned recording layer has martensi induced by processing strain.
2. A magneto-optical recording medium according to claim 1, which is made of austenitic stainless steel having a composition within the range of . （３）上記基板は複数のトラックを有し、各隣接するト
ラックは互に反転した磁化方向全有することを特徴とす
る特許請求の範囲第１項の光磁気記録媒体。(3) The magneto-optical recording medium according to claim 1, wherein the substrate has a plurality of tracks, and each adjacent track has all magnetization directions reversed from each other. （４）永久磁石材よりなる基板上に蓄熱［−設け、上記
蓄熱層の上に記録［−設けた特許請求の範囲第１項の光
磁気記録媒体。(4) The magneto-optical recording medium according to claim 1, wherein heat storage [- is provided on a substrate made of a permanent magnetic material, and recording [- is provided] on the heat storage layer.
JP23694583A 1983-12-15 1983-12-15 Photomagnetic recording medium Granted JPS60129950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23694583A JPS60129950A (en) 1983-12-15 1983-12-15 Photomagnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23694583A JPS60129950A (en) 1983-12-15 1983-12-15 Photomagnetic recording medium

Publications (2)

Publication Number Publication Date
JPS60129950A true JPS60129950A (en) 1985-07-11
JPH022222B2 JPH022222B2 (en) 1990-01-17

Family

ID=17008076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23694583A Granted JPS60129950A (en) 1983-12-15 1983-12-15 Photomagnetic recording medium

Country Status (1)

Country Link
JP (1) JPS60129950A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6283620A (en) * 1985-10-09 1987-04-17 Sumitomo Metal Ind Ltd Magnetic scale
JPH0538361U (en) * 1991-10-24 1993-05-25 川崎重工業株式会社 Recoil starter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0618024U (en) * 1992-08-18 1994-03-08 東海興業株式会社 Vehicle wind molding

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6283620A (en) * 1985-10-09 1987-04-17 Sumitomo Metal Ind Ltd Magnetic scale
JPH0132448B2 (en) * 1985-10-09 1989-06-30 Sumitomo Kinzoku Kogyo Kk
JPH0538361U (en) * 1991-10-24 1993-05-25 川崎重工業株式会社 Recoil starter

Also Published As

Publication number Publication date
JPH022222B2 (en) 1990-01-17

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