JPS61214254A - Photomagnetic recording material - Google Patents
Photomagnetic recording materialInfo
- Publication number
- JPS61214254A JPS61214254A JP60054422A JP5442285A JPS61214254A JP S61214254 A JPS61214254 A JP S61214254A JP 60054422 A JP60054422 A JP 60054422A JP 5442285 A JP5442285 A JP 5442285A JP S61214254 A JPS61214254 A JP S61214254A
- Authority
- JP
- Japan
- Prior art keywords
- film
- amorphous
- recording
- thermal stability
- temp
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- 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
- G11B11/10589—Details
- G11B11/10591—Details for improving write-in properties, e.g. Curie-point temperature
-
- 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
-
- 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
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Thin Magnetic Films (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明はＶ−ザ光を用いて情報の記録・再生。[Detailed description of the invention] [Field of application of the invention] The present invention uses V-the light to record and reproduce information.
消去を行なう光磁気記録に係り、特にその特性劣化が小
さい、高寿命に好適な光磁気記録材料に関する。The present invention relates to magneto-optical recording for erasing, and particularly to a magneto-optical recording material that exhibits little characteristic deterioration and is suitable for long life.
書き換え可能な光記録方式である光磁気記録の記録材料
として、比較的大きなカー回転角が得られる希土類一鉄
族系非晶質膜が注目を浴びている。As a recording material for magneto-optical recording, which is a rewritable optical recording system, rare earth monoiron family amorphous films, which can obtain a relatively large Kerr rotation angle, are attracting attention.
これらの非晶質膜の中でも、特にＧｄ−Ｔｂ−Ｆｅある
いはＴ ｂ −Ｆ ｅ −Ｃｏ非晶質膜で比較的大きな
カー回転角が得られており、この合金系での研究開発が
活発化している（例えば、特開昭５６−１２６９０７、
特開昭５８−７３７４６ を参照）。Among these amorphous films, relatively large Kerr rotation angles have been obtained especially for Gd-Tb-Fe or Tb-Fe-Co amorphous films, and research and development on this alloy system has become active. (For example, Japanese Patent Application Laid-Open No. 56-126907,
(See Japanese Patent Application Laid-Open No. 58-73746).
しかしこれらの合金膜も含めて、従来材の非晶質膜では
、記録・再生・消去を多数回繰υ返し文場合、Ｖ−ザ光
照射による熱履歴により再生出力の搬送波対雑音比（Ｃ
／Ｎ ）が次第に劣化しｆｃシ、あるいは大気中環境下
でも酸化等によりその特性が次第に劣化する等膜寿命の
点で問題がある。However, with conventional amorphous films, including these alloy films, when recording, reproducing, and erasing are repeated many times, the carrier wave-to-noise ratio (C
/N) gradually deteriorates and its characteristics gradually deteriorate due to oxidation, etc. even in an atmospheric environment, which poses a problem in terms of film life.
本発明の目的は高結晶化温度を有した高寿命の光磁気材
料を提供することにある。An object of the present invention is to provide a magneto-optical material with a high crystallization temperature and long life.
従来、再生出力に重要なカー回転角θＸを劣化すること
なく、耐食性を向上する元素として、Ａｔ、Ｎｉ元素が
報告されている。しかし、実用上重要なこれら非晶質膜
の熱安定性については未検討である。そこで本発明者等
は高いθＫが得られるＴｂ−Ｆｅ−Ｃｏ非晶質膜に種々
の元素を添加し、これらの膜の熱安定性の目安である結
晶化温度Ｔｘ及び記録感度の目安として重要であるキュ
リ一温度Ｔｃを測定した。代表的な例としてＴｂ３ｘ、
ａ Ｆｅ５ｌ ａ ＣＯ１１，１非晶質膜（ターゲット
面ビし
積比）のＦｅ元素を面積化で５％他の元素（Ｂ。Conventionally, At and Ni elements have been reported as elements that improve corrosion resistance without deteriorating the Kerr rotation angle θX, which is important for reproduction output. However, the thermal stability of these amorphous films, which is important for practical use, has not been studied yet. Therefore, the present inventors added various elements to Tb-Fe-Co amorphous films that can obtain high θK, and investigated the crystallization temperature Tx, which is a measure of the thermal stability of these films, and which are important as a measure of recording sensitivity. The Curie temperature Tc was measured. Typical examples include Tb3x,
a Fe5l a CO11,1 The Fe element of the amorphous film (target surface area ratio) is 5% other elements (B.
ｋｔ、Ｎｉ、Ｙ、Ｎｂ、Ｒｕ、Ｗ、 Ｓｍ、Ｇｄ。kt, Ni, Y, Nb, Ru, W, Sm, Gd.
ＤＹ、Ｈｏ、Ｅｒ）で置換し九時のＴｘとＴｃの変化を
第１図に示す。図で（＊）は無ｉｔ換のＴｂ３ζ６１’
！５７．３Ｃ０１１，１非晶質膜の値を示す。ま友それ
ら膜のＴｘとＴｃの差’Ｔ （＝ＴＩ −Ｔｃ ）を第
２図に示す。一般に非晶質膜合金膜のＴｚは高ければ高
い程高温まで非晶質相が安定であることから、より高い
熱安定性を示す。一方Ｔｃは書き込まれ次情報が安定に
存在する温度範囲内で、より低い方が書き込み時のＶ−
ザ光のパワーを低くすることが出来熱安定性に関しては
有利である。Figure 1 shows the changes in Tx and Tc at 9 o'clock after substitution with DY, Ho, Er). In the figure, (*) is Tb3ζ61' without IT replacement.
! 57.3C011,1 shows the value of an amorphous film. The difference 'T (=TI - Tc) between Tx and Tc of these films is shown in FIG. In general, the higher the Tz of the amorphous film alloy film, the more stable the amorphous phase is up to high temperatures, and therefore the higher the thermal stability. On the other hand, Tc is within the temperature range where the next information stably exists after being written, and the lower is the V-
The power of the light can be lowered, which is advantageous in terms of thermal stability.
それ故、一般に、光磁気材料の非晶質膜では、Ｔｘは高
く、シかもＴｘとＴｃの差が大きい程高い熱安定性を保
持することが出来る。従って添加元素ではカー回転角の
値を低下させずに、ＴＩを上げＴｃを下げる元素を選ぶ
必要がある。第１図。Therefore, in general, in an amorphous film of a magneto-optical material, Tx is high, and the larger the difference between Tx and Tc, the higher the thermal stability can be maintained. Therefore, it is necessary to select an element that increases TI and lowers Tc without decreasing the value of the Kerr rotation angle. Figure 1.
第２図の結果から明らかなように、本発明者等はＮｂ、
Ｗ、Ｈｏ、ＥＴの元素添加がカー回転角をほとんど低下
させずにＴｘｔ−上昇させ、ΔＴを大きくし熱安定性を
向上させるのに顕著な効果がおることを見い出し几。さ
らに特にＨｏ、Ｅｒ添加では耐酸化性も改善されること
が分った。図からＡｔあるいはＮｉ元素添加では熱安定
性の点で不利であることがわかる。これらのＮｂ、Ｗ、
Ｈａ。As is clear from the results shown in Figure 2, the inventors have discovered that Nb,
We have found that the addition of W, Ho, and ET has a remarkable effect on increasing Txt without substantially reducing the Kerr rotation angle, increasing ΔT, and improving thermal stability. Furthermore, it was found that the oxidation resistance was also improved, especially when Ho and Er were added. It can be seen from the figure that addition of At or Ni elements is disadvantageous in terms of thermal stability. These Nb, W,
Ha.
Ｅｒの効果は他の希土類−鉄族系合金膜においても同様
であり几。The effect of Er is similar in other rare earth-iron alloy films.
ここで、Ｎｂ、Ｗ、Ｈｏ、ＥＴの元素添加で上記し次効
果を得るには、その含有量は原子パーセントで０．５以
上である必要がちシ、カー回転角を低下させずに上記効
果を得るには０．５原子パ一セント以上、１０原子パー
セント以下であるのがより好ましい。また特性向上の最
適化を図る几め、Ｎｂ、Ｗ、Ｈｏ、Ｅｒの２種以上の元
素を添加することによっても上記と同じ効果が得られる
ことは明らかである。また上記元素以外にＴｍ、Ｙｂを
添加元素として用いても同様の効果が得られる。Here, in order to obtain the above-mentioned effects by adding Nb, W, Ho, and ET, the content must be 0.5 or more in atomic percent, and the above-mentioned effects can be obtained without reducing the Kerr rotation angle. In order to obtain this, it is more preferable that the content is 0.5 atomic percent or more and 10 atomic percent or less. It is also clear that the same effect as described above can be obtained by adding two or more elements of Nb, W, Ho, and Er in order to optimize the improvement of characteristics. Furthermore, similar effects can be obtained by using Tm and Yb as additional elements in addition to the above-mentioned elements.
希土類−鉄族系光磁気記録媒体の例としては、Ｔｂ−１
；’ｅ−ｃｏ、Ｔｂ−Ｆｅ、Ｔｂ−Ｇｄ −Ｆｅ、Ｔｂ
−８ｍ−Ｆｅ、Ｔｂ−Ｃｏ、Ｔｂ−Ｄ Ｙ −Ｆ ｅ
、 Ｔ ｂ −−Ｄ Ｙ −Ｆ ｅ −Ｃｏ 、 Ｔ
ｂ −Ｇｄ−Ｆｅ−Ｃｏ、Ｔｂ−８ｍ−Ｆｅ−Ｃｏ。An example of a rare earth-iron group magneto-optical recording medium is Tb-1.
;'e-co, Tb-Fe, Tb-Gd -Fe, Tb
-8m-Fe, Tb-Co, Tb-D Y -F e
, T b −−D Y −F e −Co , T
b -Gd-Fe-Co, Tb-8m-Fe-Co.
ＤＹ−８ｍ−１；’ｅ−ｃｏ等がある。There are DY-8m-1;'e-co, etc.
以下、本発明を実施例を用いて説明する。 The present invention will be explained below using examples.
本発明の非晶質合金膜は直径８インチのｐｅ円板上に５
Ｘ５ｍ” と１１０Ｘ１０＋”角の希土類元素とＣｏ元
素等の遷移金属元素を面積化で所定の組成になるように
配置した複合ターゲットを用いて、マグネトロンスパッ
タ法で作製し友。また記録・再生評価用ディスクとして
、５“φガラスディスク上にＵＶ樹脂でトラッキング用
の溝を形成し、その上に５１０ｇＭ１ｉｉ（膜厚約３０
０人）、上記非晶質合金膜（膜厚約１００ＯＡ）、Ｓ
ｉ Ｃｈ膜（膜厚約７０ＯＡ）の順に被覆したものを周
込た。The amorphous alloy film of the present invention was placed on a PE disk with a diameter of 8 inches.
It was fabricated using a magnetron sputtering method using a composite target in which a rare earth element and a transition metal element such as a Co element were arranged to have a predetermined composition by area calculation. In addition, as a disk for recording and playback evaluation, a tracking groove was formed on a 5"φ glass disk using UV resin, and a 510gM1ii (film thickness of about 30
0 people), the above amorphous alloy film (film thickness approximately 100OA), S
An iCh film (film thickness of about 70 OA) was coated in this order.
にＥｒ、Ｈｏ、Ｎｂ、Ｗを用い文例を以下に示す。Example sentences using Er, Ho, Nb, and W are shown below.
伺、添加元素”’ｅ Ｈｏ、Ｎｂ、 Ｗの比較例として
ＡＬ、Ｎｉを用い九。すなわち、ＴｂＦｅＣｏ系におい
ては無添加の’ｐ ｂ２８Ｆ ６６０ＣＯ１２と有添加
のＴｂ ２８Ｘ３Ｆｅ５７Ｃｏ１２ （Ｘ＝Ｅｒ、 Ｈ
ｏ。In addition, AL and Ni were used as comparative examples for the additive elements Ho, Nb, and W. In other words, in the TbFeCo system, the additive-free 'p b28F 660CO12 and the doped Tb 28X3Fe57Co12 (X=Er, H
o.
Ｎｂ、Ｗ、Ａｔ、Ｎｉ ）の非晶質垂直磁化膜を、Ｔｂ
ＧｄＦｅ系においては有添加の
Ｔｂ１３０ｄ１３Ｈｏ３ Ｂ’ｅｙｔの非晶質垂直磁化
膜を記録膜とし九〇これらの膜特性は、結晶化温度Ｔｘ
＝３２０〜４ｔＯＣ，キュリ一温度Ｔｃ＝１００〜１’
ｌＯｃ、保磁力Ｈｅ ＝１〜１４ｋｏ、 、カー回転角
θｔ ＝０．３ ＯＮＯ，３４°で６つ九〇これらの記
録膜について、ディスク回転数を１２０Ｏｒｐｍと一定
にして記録咎再生評価を行った。Nb, W, At, Ni) amorphous perpendicular magnetization film, Tb
In the GdFe system, an amorphous perpendicular magnetization film of doped Tb130d13Ho3B'eyt is used as a recording film.90 These film characteristics are determined by the crystallization temperature Tx.
=320~4tOC, Curie temperature Tc=100~1'
lOc, coercive force He = 1 to 14ko, , Kerr rotation angle θt = 0.3 ONO, 690 at 34° Recording and playback evaluation was performed on these recording films with the disk rotation speed kept constant at 120 rpm. .
まに１記録レ一ザ光パワー８ｍＷ、外部磁場Ｈ，、＝３
０００．、再生Ｖ−ザ光パワー１．５ｍＷとして繰シ返
し記録・読み出し、消去を行なつ交。1 recording laser beam power 8 mW, external magnetic field H,, = 3
000. , Reproduction V-The optical power was 1.5 mW, and recording, reading, and erasing were repeatedly performed.
それらの結果、上記の記録膜でＢｒ、Ｈｏ、Ｎｂ。As a result, the above recording film contains Br, Ho, and Nb.
Ｗを含んだ膜は１０’回以上の繰シ返しでも、再生出力
のＣ／Ｎが変化しなかったのに対し、それら以外の記録
膜を用い次ディスクのＣ／Ｎは、１０４回で数ｄ１３劣
化した。With the film containing W, the C/N of the reproduced output did not change even after 10' cycles or more, whereas the C/N of the next disc using other recording films changed several times after 104 cycles. d13 deteriorated.
次に上記添加膜で、耐食性・耐酸化性まで考慮すると、
Ｎｂを含んだ膜が最も良いことがわかつ友。実施例の２
として、第３図に代表的な’ｌ’ｂ２ｅｌ；ｅ７ｘ、’
ｌ’ｂ２９１ｉｋ６８ｃｍ ｔ３． Ｔｂｚ＊ｊ’ｅｓ
ａｃｍ ｔａｌｅ（Ｒ＝Ａｔ、Ｎｂ、 Ｅｒ、Ｈｏ）等
の非晶質膜を用いて、６０ Ｃｓ相対湿度９５％で放置
し九時の経時変化を示す。図の縦軸は、最初の反射率Ｒ
。Next, considering the corrosion resistance and oxidation resistance of the above additive film,
It turns out that a film containing Nb is the best. Example 2
As shown in Figure 3, the typical 'l'b2el;e7x,'
l'b291ik68cm t3. Tbz＊j'es
Using an amorphous film such as acm tale (R=At, Nb, Er, Ho), it was left at 60 Cs at a relative humidity of 95%, and the change over time at 9 hours was shown. The vertical axis of the figure is the initial reflectance R
.
で規格化した値を示す。曲線５のＴｂ−ＦｅにＣｏを添
加すると、曲＠！３で示すように、反射率Ｒの経時変化
は小さくなり、さらにこのＴｂ−１；”ｅ−ｃｏ膜にＡ
ｔ、Ｎｂを添加すると、曲線２゜１でそれぞれ示すよう
に、その経時変化はより小さくなシ、耐食性・耐酸化性
が大きく向上することが分かる。ここでＡ４は前記第１
図の結果から、結晶化温度を下げるから熱安定性の点で
劣る。それに対して、Ｎｂ添加は結晶化温度を上げ熱安
定性を高めるため、総合的にはＮｂ添加膜が熱安定性、
耐食性・耐酸化性の点で最もすぐれている。Indicates the value normalized by . When Co is added to Tb-Fe in curve 5, the song @! As shown in 3, the change in reflectance R over time becomes smaller, and furthermore, the Tb-1;
It can be seen that when t and Nb are added, the changes over time are smaller and the corrosion resistance and oxidation resistance are greatly improved, as shown by the curve 2°1. Here, A4 is the first
From the results shown in the figure, it is inferior in terms of thermal stability because the crystallization temperature is lowered. On the other hand, Nb addition raises the crystallization temperature and improves thermal stability, so overall, Nb-added films have better thermal stability and
It has the best corrosion resistance and oxidation resistance.
以上の実施例から明らかなように、本発明の非晶質垂直
磁化膜は寿命の点で極めて優れておシ、高い熱安定性を
示すことがわがつ友。As is clear from the above examples, the amorphous perpendicular magnetization film of the present invention has an extremely long life and exhibits high thermal stability.
第１図は非晶質膜の結晶化温度Ｔχ、キュリ一温度Ｔａ
を示す図、第２図は非晶質膜のΔＴ（＝Ｔｘ−Ｔｃ）を
示す図、第３図は非晶質膜の反射率Ｒの経時変化を示す
図である。
１・・・Ｔｂ２９Ｆｅｓ３Ｃｏ１３Ｎｂ！、２”・’Ｊ
’ｂｘ９ｐｅｓＢＣ６１３ＡｌＳ、３・Ｉｐｌ）２ｅＦ
ｅ５ＳＩＣ６１３，４−−−’１ｂｚ＊ ｐｅ ６８Ｃ
Ｏ１３Ｅ ｒ ｓ、５−Ｔｂ２ｏＦｅ ７１゜（５−−
−’ｌ’１）２９１；’ｅｓＢ（：’ｏ１３）（ＱＳ。Figure 1 shows the crystallization temperature Tχ and the Curie temperature Ta of the amorphous film.
FIG. 2 is a diagram showing ΔT (=Tx−Tc) of the amorphous film, and FIG. 3 is a diagram showing changes over time in the reflectance R of the amorphous film. 1...Tb29Fes3Co13Nb! , 2”・'J
'bx9pesBC613AlS, 3・Ipl)2eF
e5SIC613,4---'1bz* pe 68C
O13E r s, 5-Tb2oFe 71° (5--
-'l'1)291;'esB(:'o13)(QS.
Claims (1)
族系非晶質膜において、Ｅｒ、Ｈｏ、Ｎｂ、Ｗからなる
群のうちから選ばれた少なくとも一種の元素を０．５原
子パーセント以上含むことを特徴とする光磁気記録材料
。 ２、特許請求の範囲第１項において、前記希土類一鉄族
系非晶質膜はＴｂ−Ｆｅ−Ｃｏ系非晶質垂直磁化膜であ
り、Ｅｒ、Ｈｏ、Ｎｂ、Ｗからなる群のうちから選ばれ
た少なくとも一種の元素を０．５原子パーセント以上１
０原子パーセント以下含むことを特徴とする光磁気記録
材料。[Claims] 1. In a rare earth-iron group amorphous film having an axis of easy magnetization perpendicular to the film surface, at least one member selected from the group consisting of Er, Ho, Nb, and W. A magneto-optical recording material characterized by containing 0.5 atomic percent or more of an element. 2. In claim 1, the rare earth monoiron group-based amorphous film is a Tb-Fe-Co-based amorphous perpendicularly magnetized film, and is selected from the group consisting of Er, Ho, Nb, and W. 0.5 atomic percent or more of at least one selected element1
A magneto-optical recording material comprising 0 atomic percent or less.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60054422A JPS61214254A (en) | 1985-03-20 | 1985-03-20 | Photomagnetic recording material |
| NL8600379A NL191807C (en) | 1985-03-20 | 1986-02-14 | Magneto-optical recording medium. |
| DE19863604642 DE3604642A1 (en) | 1985-03-20 | 1986-02-14 | Magneto-optical recording medium |
| KR1019860001614A KR940008408B1 (en) | 1985-03-20 | 1986-03-07 | Optical magnetic medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60054422A JPS61214254A (en) | 1985-03-20 | 1985-03-20 | Photomagnetic recording material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61214254A true JPS61214254A (en) | 1986-09-24 |
Family
ID=12970271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60054422A Pending JPS61214254A (en) | 1985-03-20 | 1985-03-20 | Photomagnetic recording material |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS61214254A (en) |
| KR (1) | KR940008408B1 (en) |
| DE (1) | DE3604642A1 (en) |
| NL (1) | NL191807C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6297153A (en) * | 1985-10-23 | 1987-05-06 | Sumitomo Metal Mining Co Ltd | Thin film magnetic recording medium |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0782670B2 (en) * | 1985-07-12 | 1995-09-06 | 株式会社日立製作所 | 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 |
| DE3912378A1 (en) * | 1988-04-14 | 1989-10-26 | Ricoh Kk | Magneto-optical recording material |
| EP0542910B1 (en) * | 1990-08-10 | 1997-10-08 | Minnesota Mining And Manufacturing Company | Thermomagnetic recording system having high storage density and direct-overwrite capability |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5984358A (en) * | 1982-11-04 | 1984-05-16 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
| JPS6115308A (en) * | 1984-07-02 | 1986-01-23 | Hitachi Ltd | Photomagnetic recording material |
| JPS6119644A (en) * | 1984-07-06 | 1986-01-28 | Idemitsu Petrochem Co Ltd | Linear, low-density polyethylene resin composition |
| JPS6134744A (en) * | 1984-07-25 | 1986-02-19 | Hitachi Ltd | Photoelectromagnetic recording medium |
| JPS6184803A (en) * | 1984-10-03 | 1986-04-30 | Oki Electric Ind Co Ltd | Photo-magnetic recording medium |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7900921A (en) * | 1979-02-06 | 1980-08-08 | Philips Nv | THERMOMAGNETIC INFORMATION CARRIER AND OPTICAL MEMORY EQUIPMENT INCLUDED WITH SUCH INFORMATION CARRIER. |
| JPS6032331B2 (en) * | 1980-03-12 | 1985-07-27 | ケイディディ株式会社 | magneto-optical recording medium |
| JPS5873746A (en) * | 1981-10-27 | 1983-05-04 | Kokusai Denshin Denwa Co Ltd <Kdd> | Photomagnetic recording medium |
| CA1206505A (en) * | 1982-03-18 | 1986-06-24 | Richard A. Phillips | Immersed element protection |
| DE3348423C2 (en) * | 1982-05-10 | 1994-11-17 | Canon Kk | Use of an amorphous magnetic quaternary GdTbFeCo alloy for the production of a magneto-optical recording layer |
| DE3382791T2 (en) * | 1982-12-15 | 1995-12-07 | Sharp Kk | Magneto-optical memory. |
| JPS59178641A (en) * | 1983-03-29 | 1984-10-09 | Kokusai Denshin Denwa Co Ltd <Kdd> | Photomagnetic recording medium |
-
1985
- 1985-03-20 JP JP60054422A patent/JPS61214254A/en active Pending
-
1986
- 1986-02-14 NL NL8600379A patent/NL191807C/en not_active IP Right Cessation
- 1986-02-14 DE DE19863604642 patent/DE3604642A1/en active Granted
- 1986-03-07 KR KR1019860001614A patent/KR940008408B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5984358A (en) * | 1982-11-04 | 1984-05-16 | Seiko Instr & Electronics Ltd | Photomagnetic recording medium |
| JPS6115308A (en) * | 1984-07-02 | 1986-01-23 | Hitachi Ltd | Photomagnetic recording material |
| JPS6119644A (en) * | 1984-07-06 | 1986-01-28 | Idemitsu Petrochem Co Ltd | Linear, low-density polyethylene resin composition |
| JPS6134744A (en) * | 1984-07-25 | 1986-02-19 | Hitachi Ltd | Photoelectromagnetic recording medium |
| JPS6184803A (en) * | 1984-10-03 | 1986-04-30 | Oki Electric Ind Co Ltd | Photo-magnetic recording medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6297153A (en) * | 1985-10-23 | 1987-05-06 | Sumitomo Metal Mining Co Ltd | Thin film magnetic recording medium |
| JPS62132254A (en) * | 1985-12-05 | 1987-06-15 | Hitachi Maxell Ltd | Photomagnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| NL8600379A (en) | 1986-10-16 |
| NL191807C (en) | 1996-08-02 |
| DE3604642A1 (en) | 1986-10-02 |
| KR940008408B1 (en) | 1994-09-14 |
| KR860007645A (en) | 1986-10-15 |
| DE3604642C2 (en) | 1993-02-11 |
| NL191807B (en) | 1996-04-01 |
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