JPS5984358A - Photomagnetic recording medium - Google Patents

Photomagnetic recording medium

Info

Publication number
JPS5984358A
JPS5984358A JP19381982A JP19381982A JPS5984358A JP S5984358 A JPS5984358 A JP S5984358A JP 19381982 A JP19381982 A JP 19381982A JP 19381982 A JP19381982 A JP 19381982A JP S5984358 A JPS5984358 A JP S5984358A
Authority
JP
Japan
Prior art keywords
group
recording medium
elements
alloy
direction perpendicular
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
JP19381982A
Other languages
Japanese (ja)
Other versions
JPH0118506B2 (en
Inventor
Katsuhiko Yahagi
矢萩　勝彦
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP19381982A priority Critical patent/JPS5984358A/en
Publication of JPS5984358A publication Critical patent/JPS5984358A/en
Publication of JPH0118506B2 publication Critical patent/JPH0118506B2/ja
Granted legal-status Critical Current

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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
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material

Landscapes

  • Thin Magnetic Films (AREA)

Abstract

PURPOSE:To obtain a photomagnetic recording medium large in Kerr rotation angle and superior in S/N ratio by incorporating at least one kind of a specified group of elements in an amorphous alloy having an axis of easy magnetization in the direction perpendicular to a film face and composed essentially of rare earth elements and iron group elements. CONSTITUTION:A thin photomagnetic film of an amorphous alloy having an axis of easy magnetization in the direction perpendicular to the film face is formed on a substrate. Said alloy is prepared by incorporating as M at least one kind of element selected from elements of Ti, Zr, Hf of group IVB of the periodic table; V, Nb, Ta of group VB; Mo, W of group VIB; Mn, Tc, Re of group VIIB; and Ru, Rh, Pd, Os, Ir, Pt of group VIII; in an alloy represented by the formula (R is at least one of Gd, Tb, and Dy; T is at least one of Co and Fe; M is at least one of the specified metal groups to be added; 0.1<=x<=0.4, and 0.01<=y<=0.4). As a result, the obtained photomagnetic recording medium is good in optical writability, large in Kerr rotation angle, high in S/N ratio, and suitable for rewritable memory.

Description

【発明の詳細な説明】 本発明は、希土類元素と鉄族元素を主成分とする非晶質
磁性薄膜を有し、膜面と垂直方向に磁化按易方向を有す
る光磁気記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magneto-optical recording medium having an amorphous magnetic thin film mainly composed of rare earth elements and iron group elements, and having an easy magnetization direction perpendicular to the film surface. be.

従来から、希土類元素とＦｅ、Ｃｏ、Ｎｉの鉄族元素を
主成分とする一部又は全部が非晶質磁性薄膜は膜面と垂
直な方向に磁化容易軸を有す。Ｓ極あるいはＮ極に全面
磁化さ、＋また膜面に、逆向きの小さな（１μｍ径程度
）スポット（ヒ：、／ｌ・）状の反転磁化を作ることが
出来る。この反転磁区の有無を「１」、「０」に対応す
ることによってデジタル信号とした磁気メモリー媒体と
して用いることができる。このような磁性薄膜のつぢ室
温に近いキューリ一点（Ｔ　ｃ）あるいは補償温度をも
つ化合物・合金は、レーザー光等の光又（ｑ熱的効果に
よって任意の位置に任意の大きさ・形状の反転磁区を作
ることが出来る。こ１Ｌｆｅ利用することによって情報
を記録することが可能であり、ディスク、テープ、ソー
ト状の光磁気メモリー媒体として利用することが可能と
なりつつある。そして読み出す方法として、磁気カー効
果やファラデー効果を利用する方式が用いられている。Conventionally, partially or entirely amorphous magnetic thin films containing rare earth elements and iron group elements such as Fe, Co, and Ni as main components have an axis of easy magnetization in a direction perpendicular to the film surface. It is possible to make the entire surface magnetized at the S pole or the N pole, and reverse magnetization in the form of a small (about 1 μm diameter) spot (hi:, /l·) in the opposite direction on the film surface. By correlating the presence or absence of this inverted magnetic domain with "1" and "0", it can be used as a magnetic memory medium with a digital signal. Compounds and alloys that have a single Curie point (Tc) or a compensation temperature close to room temperature of such magnetic thin films can be irradiated with light such as laser light or of any size and shape at any location by thermal effects. It is possible to create inverted magnetic domains.By using this 1Lfe, it is possible to record information, and it is becoming possible to use it as a magneto-optical memory medium such as disks, tapes, and sorts.And as a reading method, A method using the magnetic Kerr effect or Faraday effect is used.

従来、公知であるｊ漠面と垂直な方向に磁化容易軸を有
し、かつ光ビームによυ情報全書き込み、読み出せる（
臓性膜合金としては、多結晶としてＭｎＴ３ｉ、ＭｎＣ
ｕＴ３ｉ、Ｐｔ−Ｃｏ、　ｃｏＯｒ、　　単結晶として
Ｇｄ工（）、ＴｂＦｅ０．ＹＧａＩＧ　、ＢｉＳｍＫ　
ｒ　（１ａ　工Ｇ　＋そして非晶）肖としてＧｄ０Ｏ，
ＴｂＦｅ。Conventionally, it has an axis of easy magnetization in the direction perpendicular to the well-known vague plane, and all information can be written and read by a light beam (
Visceral membrane alloys include MnT3i and MnC as polycrystals.
uT3i, Pt-Co, coOr, Gd() as single crystal, TbFe0. YGaIG, BiSmK
r (1a engineering G + and amorphous) as Gd0O,
TbFe.

ＤｙＦｅ　、　ＧｄＦｏＢｉ　、　ＧｄＴｂＦｅ　、　
ＴｂＤｙＦｅがあるが、この中でも非晶′Ａ磁磁性吸戻
合金良い材料として知られている。DyFe, GdFoBi, GdTbFe,
There is TbDyFe, and among these, the amorphous 'A' magnetic retraction alloy is known as a good material.

しかし上述した非晶質磁性膜合金は書込み感度が良く、
媒体ノイスが少なく、垂直磁気異方性の大面積が安定に
作製出来る。又、磁気ｔｊを性も適当に良いが、読み出
し性能（Ｓ／Ｎ比）に大きな影響を与えるカー回転角（
θＫ）が小さく、その１ヒめにＳ／Ｎ比が・」・さくな
り、光磁気記録媒体として使用することは困難であると
いう欠点を有している。However, the amorphous magnetic film alloy mentioned above has good writing sensitivity;
There is little media noise, and a large area with perpendicular magnetic anisotropy can be stably produced. In addition, although the magnetic tj is reasonably good, the Kerr rotation angle (
θK) is small, and the S/N ratio decreases in the first half, making it difficult to use as a magneto-optical recording medium.

本発明ｒ１、上記の従来の欠点を改良し、θＫを太きく
し、Ｓ／Ｎ比が優れた光６ＰＩ気記ｈ、媒体を提供する
ことにある。The object of the present invention is to improve the above-mentioned conventional drawbacks, increase θK, and provide an optical 6PI memory medium with an excellent S/N ratio.

本発明の光磁気記録媒体は、膜面に垂直な大部分の方向
が良化容易軸と両気異方性盆有するものてをり、キュー
リ一点（ＴＣ）および補償温度（Ｔ　ｃｏ＋ｎｐｔ　）
が室温に近く′５０℃〜２００℃を有する大部分が非晶
質状態の薄膜である。The magneto-optical recording medium of the present invention has an easy axis of improvement in most of the directions perpendicular to the film surface and a bidirectional anisotropic basin, and has a single Curie point (TC) and a compensation temperature (T co + npt ).
It is a thin film that is mostly amorphous and has a temperature close to room temperature, from 50°C to 200°C.

ぞして従来から希土類元素（Ｒ）のＧ　（１，、Ｔ　１
１　。Therefore, G (1,, T 1
1.

ＤＹ　＋　とＰ′θ、ＣＯの上記非晶鈎合金に光磁気効
果、　Ｔ　Ｏ、Ｔ　ｃｏｍｐｔが比較的良いことから光
（１蝕気Ｆｔｅ録媒体として注目され、研究が進めら〕
１でいる。The above-mentioned amorphous hook alloy of DY + , P'θ, and CO has relatively good magneto-optical effects, T O and T compt, so it has attracted attention as a recording medium for optical FTE, and research is progressing.
Stay at 1.

しかし、よジ優すした記録媒体と−ｌるには、θにの大
きな優れたものにする必凹がある。θＫを太きくするこ
とにより、読出し性能（ｓ／ＮＪｔ）を良く疫ることが
大切である。そしてθＫが大きく、しかもＴ　ｃ　、　
Ｔ　ｃｏｍｐｔ、磁気特性は従来の媒体と変らないか、
又はより優ｉ１Ｌ媒体か必波である。However, in order to make a recording medium of good quality, it is necessary to have a large and excellent θ. It is important to improve the read performance (s/NJt) by increasing θK. And θK is large, and T c ,
T compt, are the magnetic properties the same as conventional media?
Or better i1L medium or necessary wave.

今までにもθＫを太きくするために、Ｏｒ、Ｎｉ。In order to make θK thicker, Or, Ni.

ＢＬ、Ｏｕ、Ａｇ、Ａｕ、Ｓｎ、ｃｏ　等の添加による
改良が試みらねでいる。Improvements by adding BL, Ou, Ag, Au, Sn, co, etc. have not been attempted.

本発明では、θＫが太きくなり、しかもその他の特性で
あるＴ　Ｃ、Ｔ　ＣＯｍｐ’ｔ、　、　磁気特性等はほ
とんど悪くならない添加元素として、Ｔｉ、Ｚｒ。In the present invention, Ti and Zr are used as additive elements that increase θK and do not substantially deteriorate other properties such as T C , T Comp't, and magnetic properties.

Ｈｆ０ＩＶＢ族、Ｖ、Ｎｂ、ＴａのＶＢ族、ＭＯ。Hf0IVB group, VB group of V, Nb, Ta, MO.

ＷのＶｊＢ族、Ｍｎ、Ｔｃ、Ｒｅの〜ＩＢ族、Ｒｕ。VjB group of W, Mn, Tc, ~IB group of Re, Ru.

Ｒｈ、Ｐａ、Ｏｓ、Ｉｒ、Ｐｔの■Ｂ族を発明したこと
にある。しかもこれらはＲとしてＧｄ。The reason lies in the invention of the ■B group of Rh, Pa, Os, Ir, and Pt. Moreover, these are Gd as R.

Ｔｂ、Ｄｙ以外のＳ　Ｃ＋　Ｙ　＋　Ｌ　ａ　＋　Ｏｅ
　＋　Ｐ　ｒ　ＩＮａ、Ｐｍ、Ｓｍ、Ｅｕ、Ｈｏ、Ｆ３
ｒ、Ｔｍ。S C+ Y + L a + Oe other than Tb and Dy
+ P r INa, Pm, Sm, Eu, Ho, F3
r, Tm.

Ｙｂ、Ｌｕでも同様に効果があることケ確認できた。It was confirmed that Yb and Lu were similarly effective.

、り下、本発明の詳細な説明する。, below, a detailed explanation of the present invention will be given.

Ｒ（、＝　Ｏｄ　、　Ｔ　ｂ　、　］）　ｙ　）とＴ（
＝ＣＯ１Ｆθ）の非晶買会金膜ＲＸＴｔ−１Ｂ、−Ｈ従
来から０，１≦ｘく０．４と広く知られている通シであ
る。（例えば特願昭５５−３０２５１．５５−１７０２
３９　。R(,=Od,Tb, ])y) and T(
=CO1Fθ) amorphous gold film RXTt-1B, -H This is a widely known convention that 0.1≦x0.4. (For example, patent application No. 55-30251.55-1702
39.

５５−３７３４７　　　５Ｌｌ−１（１７１０７５１−
２５５３４，５１−２５５３，１牙）そしてこオ］らば
、Ｔ　ｃ　、　Ｔ　ｃｏｒｎｐｔが５０℃−２００℃で
あり、適当な磁気特性（Ｍｓ　、Ｈｃ　、Ｋｕ）を有し
、垂１ばな磁化容易１１ＩｌＩＩを持つ媒体である。そ
してこれらはスパッター装置、真空＆着装置、イオンプ
レーディング装置、その他の多くの無電解メッキ法によ
って作製される。一般にターゲットは溶ｙｆ（法。55-37347 5Ll-1 (1710751-
25534; It is a medium with easy 11IlII. These can be manufactured using sputter equipment, vacuum & deposition equipment, ion plating equipment, and many other electroless plating methods. Generally, the target is molten yf (method).

粉末凝固法、あるいはＲとＴの面積比による法等で作製
さ′ｔする。そして基機に７リコンウエノ・−。It is manufactured by a powder solidification method or a method based on the area ratio of R and T. And the base machine is 7 Recon Ueno.

ガラス、ＰＭＭＡ材等上に５０Ａ−数ｌｌ程ｊ現の膜が
形成さね、る。我々も同様にして膜を作製した。The current film is formed on glass, PMMA materials, etc. in a thickness of several liters. We also prepared a membrane in the same manner.

そしてθＫをカー回転角？Ｉｌす定暑：（によって測定
し７た結果を、２Ａ１図、第２図に示したものである。And is θK the Kerr rotation angle? Ilsu constant heat: The results measured by (7) are shown in Figure 2A1 and Figure 2.

第１図においてはＲ＝ＧｃＬ　、　Ｔｂ　、　Ｔ　＝Ｃ
ｏ　、　Ｆｅの場合で、Ｘ（は０．１≦Ｘ≦０．４の範
囲ではいずれもほぼ左点の、ｙ＝ｏでのθにの値である
。In Figure 1, R=GcL, Tb, T=C
In the case of o and Fe, X( is the value of θ at y=o, which is almost the left point in the range of 0.1≦X≦0.4.

そしてＭ”Ｚｒ、Ｈｆ、Ｖ、Ｗ、Ｍｎ、ＲｅでＹが０．
０１＜Ｙ＜０．４の間でｉ♀１加し７でいる。そ］１以
上では、あ″！、９効果が良くないようである１、この
結果は、本発明の他のＲ、’ｒ　、　Ｍｒ、）元素につ
いてもいずハ、も同様である。しかも従来の媒体に比べ
他の特性はほとんど変化が無いが、むしろ（ｉＢ気時特
性ｆｌ　ｃ等にｔ良くなっていた。And M''Zr, Hf, V, W, Mn, Re and Y is 0.
Between 01<Y<0.4, i♀1 is added to 7. It seems that the effect is not good for 1 or more. 1. This result is the same for the other R, 'r, Mr,) elements of the present invention as well as for the conventional elements. There was almost no change in other characteristics compared to the medium, but on the contrary, they were improved (iB air-temperature characteristics fl c, etc.).

第２図においてもＭ＝Ｎｂ、Ｔａ、Ｍｏ、Ｒｈ。Also in FIG. 2, M=Nb, Ta, Mo, Rh.

Ｏｅ、Ｐｔの例を示し１ζが、第１図の場合と１ＦＩ＋
様であった。そして特にＺｒ、Ｈｆ、Ｎｂ、Ｔａ等の効
果は太きいようである。こ第１．らの図ばいずわ。In the example of Oe and Pt, 1ζ is the case of Fig. 1 and 1FI+
It was like that. In particular, the effects of Zr, Hf, Nb, Ta, etc. seem to be significant. This first thing. The drawings of these people.

も代表的な結果であるが、本発明ＯＲ，Ｔ、Ｍの多くの
組合せにおいても同様の結果が得らねでいる。更に本分
、明のＭは、多結晶膜、単結晶ｊ摸にも有効である。Although this is a typical result, similar results cannot be obtained with many combinations of OR, T, and M of the present invention. Furthermore, Ming's main purpose is also effective for polycrystalline films and single crystal films.

以上説明した本発明の光碌気記録媒体は、カー効果又は
）゛アラデー効果を利用して読出しを行なう。ただし書
込みは、レザー光等の元ビームを用いてその光熱磁気効
果を利用するものである。このように、ビーム・アドレ
ッサブルメモリとして利用できる宵き換え可能なメモリ
ーとなる。そしてθに太のためＳ／Ｎが優れ、ファイル
、コンピュータ、オーディオ、ビデオ用の書き換え可能
メモリーとして広く応用することが可能である。そして
７１き込み、読出し、消去等がＡｒ、Ｈｅ−Ｎｅそして
半導体レーザー（例えばＧａ−Ａμ・Ａｓ等）によって
可能とイーることができる。The optical recording medium of the present invention described above performs reading using the Kerr effect or the Allardy effect. However, writing uses a source beam such as a laser beam and utilizes its photothermal magnetic effect. In this way, it becomes a memory that can be used as a beam addressable memory and can be changed overnight. Since the θ is thick, the S/N ratio is excellent, and it can be widely applied as a rewritable memory for files, computers, audio, and video. Writing, reading, erasing, etc. can be performed using Ar, He--Ne, or semiconductor lasers (eg, Ga--A.mu..As).

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

第１図は（Ｒｘ　’Ｉ’１−Ｘ）１−Ｙ　Ｍｙ　　にお
いて、Ｒ−Ｃ）ｄ、Ｔｂ、Ｔ＝Ｏｏ、Ｆｅ、０．１≦Ｘ
≦３．４の組成にＭ　＝Ｚ　ｒ　！　Ｈｆ　ｒ　Ｖ　＋
　Ｗ−Ｍ　ｎ　＋　Ｒｅ　ｆ加えた［Ｐｌのカー回転角
θにと原子比Ｙの関係紫示ずグラフである。 第２図は（Ｒｘ　Ｔ１−Ｘ）１−Ｙ　Ｍｙ　　において
、Ｒ：Ｇ　ｃｌ　、　Ｄ　ｙ　、　Ｕ　ｂ　、　Ｔ　＝
　Ｏｏ　Ｆｅ、１１．１ニＸ［，１，４の組成にＭ＝Ｎ
ｂ、Ｔａ、Ｍｏ、Ｒｌｔ、Ｏｅ、Ｐｔｉ加えた１１すい
カー回転角θにと原子比Ｙの１．ジ４係を示すグラフで
ある。 」ユノ、１− 出願人　株式会社　巣二＃４ｔ　、−１１舎□Ｙ−一一
十 第２図 ０　　　　’０１　　　０．２　　０３　　　θ４　０
５　　θ６　　θ７□Ｙ−〉Figure 1 shows (Rx 'I'1-X)1-Y My, R-C)d, Tb, T=Oo, Fe, 0.1≦X
M = Z r for a composition of ≦3.4! Hf r V +
This is a graph showing the relationship between the Kerr rotation angle θ of Pl and the atomic ratio Y with W-M n + Ref added. FIG. 2 shows that in (Rx T1-X)1-Y My, R: G cl , D y , U b , T =
Oo Fe, M=N in the composition of 11.1niX[,1,4
b, Ta, Mo, Rlt, Oe, Pti plus 11 diagonal Kerr rotation angle θ and atomic ratio Y of 1. It is a graph showing the 4th section. ” Yuno, 1- Applicant Suji Co., Ltd. #4t, -11 building □ Y-110 Fig. 2 0 '01 0.2 03 θ4 0
5 θ6 θ7□Y->

Claims (3)

【特許請求の範囲】[Claims] （１）膜面に垂直な方向に磁化容易軸を有する非晶質合
金において、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ。 Ｍｏ、Ｗ、Ｍｎ、Ｔｃ、Ｒｅ、Ｒｕ、Ｒｈ、Ｐｄ、Ｏｅ
。 工ｒ、Ｐｔ　　の１　ｆｉ！以上を含有することを特徴
とした薄膜光磁気記録媒体。(1) Ti, Zr, Hf, V, Nb, Ta in amorphous alloys having an axis of easy magnetization in the direction perpendicular to the film surface. Mo, W, Mn, Tc, Re, Ru, Rh, Pd, Oe
. 1 fi of Engineering r, Pt! A thin film magneto-optical recording medium characterized by containing the above. （２）合金の一般式（ＲＸＴＩ−ｘバーｘＭｘ　　（Ｒ
はＧｄ、Ｔｂ、Ｄｙが１種以上である。址たＴは、Ｃｏ
；Ｆｅが１押以上である。Ｍは％ｆ′ｆ請求の範囲第１
項記載の１種以上の元素である。そしてＸは、０．１≦
Ｘ≦０．４．Ｙは０．０１（Ｙ／Ｑ、４である。）で示
される組成を有する特許Ｇ１７求の範囲第１項記載の薄
膜光磁気記録媒体。(2) General formula of alloy (RXTI-x bar x Mx (R
contains one or more of Gd, Tb, and Dy. The deceased T is Co
;Fe is 1 press or more. M is %f'fClaim 1
It is one or more elements listed in the section. And X is 0.1≦
X≦0.4. The thin film magneto-optical recording medium according to the scope of Patent G17, item 1, having a composition where Y is 0.01 (Y/Q, 4). （３）　　Ｒ，はＧｃｌ、Ｔｂ、Ｄｙ、Ｓｃ、Ｙ、Ｌａ
、Ｏｅ。 Ｐｒ、Ｎｄ、Ｐｍ、　Ｓｍ、ｍｕ、Ｈｏ、Ｅｒ、Ｔｍ、
Ｙ′ｂ。 Ｌｕが１種以上である特許請求の範囲第２項記載の薄膜
磁気記録媒体。(3) R is Gcl, Tb, Dy, Sc, Y, La
, Oe. Pr, Nd, Pm, Sm, mu, Ho, Er, Tm,
Y'b. 3. The thin film magnetic recording medium according to claim 2, wherein Lu is one or more types.
JP19381982A 1982-11-04 1982-11-04 Photomagnetic recording medium Granted JPS5984358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19381982A JPS5984358A (en) 1982-11-04 1982-11-04 Photomagnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19381982A JPS5984358A (en) 1982-11-04 1982-11-04 Photomagnetic recording medium

Publications (2)

Publication Number Publication Date
JPS5984358A true JPS5984358A (en) 1984-05-16
JPH0118506B2 JPH0118506B2 (en) 1989-04-06

Family

ID=16314275

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19381982A Granted JPS5984358A (en) 1982-11-04 1982-11-04 Photomagnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5984358A (en)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60193125A (en) * 1984-03-13 1985-10-01 Mitsubishi Electric Corp Vertical magnetic recording medium
JPS60246606A (en) * 1984-05-22 1985-12-06 Ricoh Co Ltd Amorphous magneto-optical layer
JPS60253041A (en) * 1984-05-29 1985-12-13 Agency Of Ind Science & Technol Photothermomagnetic recording medium
EP0168046A2 (en) * 1984-07-11 1986-01-15 Hitachi, Ltd. Magneto-optical recording material
JPS6151806A (en) * 1984-08-21 1986-03-14 Seiko Instr & Electronics Ltd Photomagnetic recording medium
JPS6153703A (en) * 1984-08-23 1986-03-17 Seiko Instr & Electronics Ltd Photomagnetic recording medium
JPS61104446A (en) * 1984-10-26 1986-05-22 Nec Corp Photomagnetic recording medium
JPS61104445A (en) * 1984-10-26 1986-05-22 Nec Corp Photomagnetic recording medium
JPS61107555A (en) * 1984-10-31 1986-05-26 Nec Corp Optomagnetic recording medium
JPS61214254A (en) * 1985-03-20 1986-09-24 Hitachi Ltd Photomagnetic recording material
JPS61253655A (en) * 1985-05-02 1986-11-11 Pioneer Electronic Corp Photomagnetic recording medium
JPS61265756A (en) * 1985-05-20 1986-11-25 Pioneer Electronic Corp Photomagnetic recording medium
JPS6247846A (en) * 1985-08-26 1987-03-02 Seiko Epson Corp Photomagnetic recording medium
JPS6275953A (en) * 1985-09-30 1987-04-07 Toshiba Corp Photomagnetic recording medium and its production
JPS62132254A (en) * 1985-12-05 1987-06-15 Hitachi Maxell Ltd Photomagnetic recording medium
JPS62185266A (en) * 1986-02-12 1987-08-13 Canon Inc Optical recording medium
EP0233062A2 (en) * 1986-02-05 1987-08-19 Oki Electric Industry Company, Limited Magneto-optic memory medium
JPS62197939A (en) * 1986-02-24 1987-09-01 Oki Electric Ind Co Ltd Photomagnetic recording medium
US4695514A (en) * 1983-11-29 1987-09-22 Sharp Kabushiki Kaisha Magneto-optical memory element
JPS63122034A (en) * 1986-11-12 1988-05-26 Hitachi Ltd Magneto-optical recording medium
JPS63253555A (en) * 1987-01-14 1988-10-20 ミネソタ　マイニング　アンド　マニユフアクチユアリング　カンパニー Stable magnetooptical recording medium
US4780377A (en) * 1986-05-16 1988-10-25 Sumitomo Electric Industries, Ltd. Magneto-optical recording medium
JPS63262446A (en) * 1987-04-17 1988-10-28 Mitsui Petrochem Ind Ltd Thin amorphous-alloy film
US4822675A (en) * 1987-01-14 1989-04-18 Minnesota Mining And Manufacturing Company Stable magneto optic recording medium
US4837118A (en) * 1986-05-12 1989-06-06 Fuji Photo Film Co., Ltd. Magneto-optical recording medium
EP0443442A2 (en) * 1990-02-16 1991-08-28 Mitsubishi Plastics Industries Limited Magneto-optical recording medium
US5100741A (en) * 1984-09-12 1992-03-31 Seiko Epson Corporation Magneto-optic recording systems
US5254182A (en) * 1988-10-17 1993-10-19 Mitsui Petrochemical Industries, Ltd. Thin film of amorphous alloy
US5660929A (en) * 1984-11-12 1997-08-26 Sumitomo Special Metals Co., Ltd. Perpendicular magnetic recording medium and method of producing same
US5952094A (en) * 1991-09-03 1999-09-14 U.S. Philips Corporation Magneto-optical recording medium
US6042954A (en) * 1996-04-22 2000-03-28 Sharp Kabushiki Kaisha Magneto-optical recording medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960643A (en) * 1972-08-29 1974-06-12
JPS5441179A (en) * 1977-09-08 1979-04-02 Citizen Watch Co Ltd Multivibrator for temperature detection
JPS5674843A (en) * 1979-11-21 1981-06-20 Fuji Photo Film Co Ltd Photomagnetic recording medium
JPS56105344A (en) * 1980-01-25 1981-08-21 Fuji Photo Film Co Ltd Photomagnetic recording medium
JPS56126907A (en) * 1980-03-12 1981-10-05 Kokusai Denshin Denwa Co Ltd <Kdd> Magnetic optical recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960643A (en) * 1972-08-29 1974-06-12
JPS5441179A (en) * 1977-09-08 1979-04-02 Citizen Watch Co Ltd Multivibrator for temperature detection
JPS5674843A (en) * 1979-11-21 1981-06-20 Fuji Photo Film Co Ltd Photomagnetic recording medium
JPS56105344A (en) * 1980-01-25 1981-08-21 Fuji Photo Film Co Ltd Photomagnetic recording medium
JPS56126907A (en) * 1980-03-12 1981-10-05 Kokusai Denshin Denwa Co Ltd <Kdd> Magnetic optical recording medium

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695514A (en) * 1983-11-29 1987-09-22 Sharp Kabushiki Kaisha Magneto-optical memory element
JPH0513323B2 (en) * 1984-03-13 1993-02-22 Mitsubishi Electric Corp
JPS60193125A (en) * 1984-03-13 1985-10-01 Mitsubishi Electric Corp Vertical magnetic recording medium
JPS60246606A (en) * 1984-05-22 1985-12-06 Ricoh Co Ltd Amorphous magneto-optical layer
JPS60253041A (en) * 1984-05-29 1985-12-13 Agency Of Ind Science & Technol Photothermomagnetic recording medium
EP0168046A3 (en) * 1984-07-11 1987-01-21 Hitachi, Ltd. Magneto-optical recording material
EP0168046A2 (en) * 1984-07-11 1986-01-15 Hitachi, Ltd. Magneto-optical recording material
US4880694A (en) * 1984-07-11 1989-11-14 Hitachi, Ltd. Magneto-optical recording material
JPS6151806A (en) * 1984-08-21 1986-03-14 Seiko Instr & Electronics Ltd Photomagnetic recording medium
JPS6153703A (en) * 1984-08-23 1986-03-17 Seiko Instr & Electronics Ltd Photomagnetic recording medium
US5100741A (en) * 1984-09-12 1992-03-31 Seiko Epson Corporation Magneto-optic recording systems
JPS61104446A (en) * 1984-10-26 1986-05-22 Nec Corp Photomagnetic recording medium
JPS61104445A (en) * 1984-10-26 1986-05-22 Nec Corp Photomagnetic recording medium
JPS61107555A (en) * 1984-10-31 1986-05-26 Nec Corp Optomagnetic recording medium
US5660929A (en) * 1984-11-12 1997-08-26 Sumitomo Special Metals Co., Ltd. Perpendicular magnetic recording medium and method of producing same
NL8600379A (en) * 1985-03-20 1986-10-16 Hitachi Ltd MAGNETO-OPTICAL REGISTRATION TOOL.
DE3604642A1 (en) * 1985-03-20 1986-10-02 Hitachi, Ltd., Tokio/Tokyo Magneto-optical recording medium
JPS61214254A (en) * 1985-03-20 1986-09-24 Hitachi Ltd Photomagnetic recording material
JPS61253655A (en) * 1985-05-02 1986-11-11 Pioneer Electronic Corp Photomagnetic recording medium
JPS61265756A (en) * 1985-05-20 1986-11-25 Pioneer Electronic Corp Photomagnetic recording medium
JPS6247846A (en) * 1985-08-26 1987-03-02 Seiko Epson Corp Photomagnetic recording medium
JPS6275953A (en) * 1985-09-30 1987-04-07 Toshiba Corp Photomagnetic recording medium and its production
JPS62132254A (en) * 1985-12-05 1987-06-15 Hitachi Maxell Ltd Photomagnetic recording medium
EP0233062A2 (en) * 1986-02-05 1987-08-19 Oki Electric Industry Company, Limited Magneto-optic memory medium
JPS62185266A (en) * 1986-02-12 1987-08-13 Canon Inc Optical recording medium
JP2504946B2 (en) * 1986-02-24 1996-06-05 沖電気工業株式会社 Magneto-optical recording medium
JPS62197939A (en) * 1986-02-24 1987-09-01 Oki Electric Ind Co Ltd Photomagnetic recording medium
US4837118A (en) * 1986-05-12 1989-06-06 Fuji Photo Film Co., Ltd. Magneto-optical recording medium
US4780377A (en) * 1986-05-16 1988-10-25 Sumitomo Electric Industries, Ltd. Magneto-optical recording medium
JPS63122034A (en) * 1986-11-12 1988-05-26 Hitachi Ltd Magneto-optical recording medium
US4822675A (en) * 1987-01-14 1989-04-18 Minnesota Mining And Manufacturing Company Stable magneto optic recording medium
JPS63253555A (en) * 1987-01-14 1988-10-20 ミネソタ　マイニング　アンド　マニユフアクチユアリング　カンパニー Stable magnetooptical recording medium
JPS63262446A (en) * 1987-04-17 1988-10-28 Mitsui Petrochem Ind Ltd Thin amorphous-alloy film
US5254182A (en) * 1988-10-17 1993-10-19 Mitsui Petrochemical Industries, Ltd. Thin film of amorphous alloy
EP0443442A2 (en) * 1990-02-16 1991-08-28 Mitsubishi Plastics Industries Limited Magneto-optical recording medium
US5952094A (en) * 1991-09-03 1999-09-14 U.S. Philips Corporation Magneto-optical recording medium
US6042954A (en) * 1996-04-22 2000-03-28 Sharp Kabushiki Kaisha Magneto-optical recording medium

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