JPH0431871A - Thermomagnetic recording medium - Google Patents
Thermomagnetic recording mediumInfo
- Publication number
- JPH0431871A JPH0431871A JP13713690A JP13713690A JPH0431871A JP H0431871 A JPH0431871 A JP H0431871A JP 13713690 A JP13713690 A JP 13713690A JP 13713690 A JP13713690 A JP 13713690A JP H0431871 A JPH0431871 A JP H0431871A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic
- thermomagnetic
- layers
- artificial lattice
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 230000005415 magnetization Effects 0.000 claims description 5
- 230000004907 flux Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910000599 Cr alloy Inorganic materials 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001552 radio frequency sputter deposition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 101100027969 Caenorhabditis elegans old-1 gene Proteins 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Photoreceptors In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、磁気潜像を形成するのに適した熱磁気記録媒
体に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermomagnetic recording medium suitable for forming a magnetic latent image.
（従来の技術）
従来、熱磁気記録媒体は、例えば熱磁気プリンタに用い
られており、その場合熱磁気記録媒体に磁気潜像が形成
され、これを磁気的に現像して可視像を得るようにして
いる（「マグネトグラフィプリンタ」今村舜仁著、大野
信編集、ＣＭＣｒノンインパクトプリンティング」第１
５章Ｐ、１５９〜Ｐ。(Prior Art) Conventionally, thermomagnetic recording media have been used, for example, in thermomagnetic printers, in which case a magnetic latent image is formed on the thermomagnetic recording medium, and this is magnetically developed to obtain a visible image. (“Magnetography Printer” by Shunji Imamura, edited by Makoto Ohno, CMCr Non-Impact Printing, Vol. 1)
Chapter 5 P, 159-P.
１６８．１９８６参照）。168.1986).
第４図は従来の熱磁気プリンタの印刷プロセス図である
。FIG. 4 is a printing process diagram of a conventional thermomagnetic printer.
図において、記録用磁気ドラム１は矢印Ａ方向に回転す
る。該記録用磁気ドラム１面上には磁気潜像を形成する
ための熱磁気記録媒体であるＣｒＯ□薄膜等が設けられ
ている。In the figure, a recording magnetic drum 1 rotates in the direction of arrow A. A CrO□ thin film, etc., which is a thermomagnetic recording medium for forming a magnetic latent image, is provided on one surface of the recording magnetic drum.
印刷プロセスにおいて、まず消磁手段２が磁気記録媒体
を一定方向に磁化する。次に、磁気記録手段３が所定の
磁気潜像を形成し、現象手段４が磁気潜像上にトナーを
付着させることにより、磁気潜像は可視像化される。こ
こで、トナーは磁気記録媒体面上の洩れ磁界による磁力
線と磁気記録媒体面とが交差する部分に付着し、その結
果、磁気潜像は可視像化される。In the printing process, first, the demagnetizing means 2 magnetizes the magnetic recording medium in a certain direction. Next, the magnetic recording means 3 forms a predetermined magnetic latent image, and the developing means 4 deposits toner on the magnetic latent image, thereby making the magnetic latent image visible. Here, the toner adheres to the area where the lines of magnetic force caused by the leakage magnetic field on the surface of the magnetic recording medium intersect with the surface of the magnetic recording medium, and as a result, the magnetic latent image is visualized.
その後、転写手段５及び定着手段６は、可視像を用紙上
に転写、定着する。最後にクリーニング手段７は磁気記
録媒体上の残留トナーを除去し、印刷プロセスを終了す
る。Thereafter, the transfer means 5 and the fixing means 6 transfer and fix the visible image onto the paper. Finally, the cleaning means 7 removes the residual toner on the magnetic recording medium and ends the printing process.
ところで、上記磁気記録媒体上に磁気潜像を記録する方
法としてはサーマルヘッドを用いる方法やレーザビーム
光照射により加熱する方法がある。By the way, methods for recording a magnetic latent image on the magnetic recording medium include a method using a thermal head and a method of heating by laser beam irradiation.
また、磁気記録媒体の磁化方向は、主として記録媒体面
に沿う方向（面内記録法）と記録媒体の面に対し垂直で
ある方向（垂直記録法）とがあり、高解像度を必要とす
る場合には垂直記録法が用いられる。垂直記録用紙の磁
気記録媒体は、希土類元素と鉄族元素との合金膜、すな
わちＲ［ｉ−７Ｍ合金膜又はＣｏ−Ｃｒ合金膜で形成さ
れる。ＲＥ−７Ｍ合金膜は熱磁気記録法を用いた光磁気
ディスクに、またＣｏ−Ｃｒ合金膜は磁気ヘッド記録法
を用いた磁気ディスクに多く用いられている。In addition, the magnetization direction of a magnetic recording medium is mainly along the recording medium surface (in-plane recording method) and perpendicular to the recording medium surface (perpendicular recording method), and when high resolution is required. Perpendicular recording method is used. The magnetic recording medium of perpendicular recording paper is formed of an alloy film of a rare earth element and an iron group element, that is, an R[i-7M alloy film or a Co-Cr alloy film. RE-7M alloy films are often used in magneto-optical disks using thermomagnetic recording, and Co--Cr alloy films are often used in magnetic disks using magnetic head recording.
（発明が解決しようとする！！り
しかしながら、上記構成の熱磁気記録媒体においては、
Ｃｏ−Ｃｒ合金膜で形成した場合はキューリ点が高いた
め熱磁気記録が困難となり、ＲＥ−７Ｍ合金膜で形成し
た場合は残留磁束密度が小さいためトナーの付着力が不
十分となる。(This is what the invention attempts to solve!! However, in the thermomagnetic recording medium with the above configuration,
When a Co--Cr alloy film is formed, thermomagnetic recording is difficult due to the high Curie point, and when an RE-7M alloy film is formed, the residual magnetic flux density is small, resulting in insufficient toner adhesion.
このように、垂直記録用の垂直磁化膜を用いた熱磁気プ
リンタは原理的には記録の安定性が高く、高解像度を得
ることができ、低消費電力で作動する等の特徴があるも
のの、垂直磁化膜として適する材料がない。As described above, although thermomagnetic printers using perpendicular magnetization films for perpendicular recording have high recording stability in principle, can obtain high resolution, and operate with low power consumption, There is no material suitable for a perpendicular magnetization film.
本発明は、上記従来の熱磁気記録媒体の問題点を解決し
て、残留磁束密度が高く、しかも低キユーリ温度を存す
る材料で作られた熱磁気記録媒体を提供することを目的
とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional thermomagnetic recording medium and to provide a thermomagnetic recording medium made of a material that has a high residual magnetic flux density and a low Curie temperature.
（課題を解決するための手段）
そのために、本発明の熱磁気記録媒体においては、基板
の上に人工格子膜からなる垂直磁化膜を積層していて、
上記人工格子膜が、Ｃｏ層とＰｔ層を交互に積層したＣ
ｏ／Ｐｔ人工格子膜又はＣｏ層とＰｄ層を交互に積層し
たＣｏ／Ｐｄ人工格子膜で形成される。(Means for Solving the Problems) For this purpose, in the thermomagnetic recording medium of the present invention, a perpendicular magnetization film made of an artificial lattice film is laminated on the substrate,
The above artificial lattice film is a C layer in which Co layers and Pt layers are alternately laminated.
It is formed of an o/Pt superlattice film or a Co/Pd superlattice film in which Co layers and Pd layers are alternately laminated.
そして、上記人工格子膜は、Ｃｏ層厚ｄｃａが１人≦ｄ
Ｃｏ６１５人
であり、Ｐｔ層厚又はＰｄ層厚ｄＰｘが２人≦ｄＰｘ≦
３０人
であるように形成される。The artificial lattice film has a Co layer thickness dca of 1≦d.
Co615 people, Pt layer thickness or Pd layer thickness dPx is 2 people≦dPx≦
Formed to be 30 people.
ここで、上記ｄ５はｄＰＬ又はｄＰｘを示す。Here, the above d5 indicates dPL or dPx.
（作用）
本発明によれば、上記のように、基板の上に人工格子膜
からなる垂直磁化膜を積層していて、上記人工格子膜が
、Ｃｏ層とＰｔ層を交互に積層したＣＯ／Ｐｔ人工格子
膜又はＣｏ層とＰｄ層を交互に積層したＣｏ／Ｐ ｄ人
工格子膜で形成される。(Function) According to the present invention, as described above, a perpendicularly magnetized film made of an artificial lattice film is laminated on a substrate, and the artificial lattice film is a CO/2 layer formed by alternately laminating Co layers and Pt layers. It is formed of a Pt superlattice film or a Co/Pd superlattice film in which Co layers and Pd layers are alternately laminated.
このように形成された熱磁気記録媒体は、磁気記録手段
によって所定の磁気潜像が形成され、該磁気潜像上にト
ナーが付着して可視像化される。In the thermomagnetic recording medium thus formed, a predetermined magnetic latent image is formed by the magnetic recording means, and toner adheres to the magnetic latent image to form a visible image.
そして、上記磁気記録手段によって磁気潜像が形成され
る際に、記録媒体の面に対して垂直の方向に記録を行う
ことができる。When a magnetic latent image is formed by the magnetic recording means, recording can be performed in a direction perpendicular to the surface of the recording medium.
（実施例）
以下、本発明の実施例について図面を参照しながら詳細
に説明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明の熱磁気記録媒体を示す図、第１図（Ａ
）は熱磁気記録媒体の断面図、第１図（Ｂ）は記録用磁
気ドラムの断面図である。FIG. 1 is a diagram showing a thermomagnetic recording medium of the present invention, FIG.
) is a sectional view of a thermomagnetic recording medium, and FIG. 1(B) is a sectional view of a recording magnetic drum.
図において、厚さが数十〜数百ミクロンの曲折自在なス
テンレス基板８上に、ＲＦスパッタ法を用いて垂直磁化
膜、すなわち数百ミクロンの膜厚を有するＣｏ／Ｐｔ人
工格子膜１０が積層されて熱磁気記録媒体１１が形成さ
れる。該熱磁気記録媒体１１はシート状に形成され、記
録用磁気ドラム芯材１２上に巻き付けられる。In the figure, a perpendicularly magnetized film, that is, a Co/Pt superlattice film 10 having a thickness of several hundred microns, is laminated by RF sputtering on a bendable stainless steel substrate 8 with a thickness of several tens to hundreds of microns. The thermomagnetic recording medium 11 is thus formed. The thermomagnetic recording medium 11 is formed into a sheet shape, and is wound onto a recording magnetic drum core material 12 .
上記Ｃｏ／Ｐｔ人工格子ｌＩ！１０のＣｏ層厚（ｄｃ。The above Co/Pt artificial lattice II! Co layer thickness of 10 (dc.
）は１人≦ｄｃａ≦１５Åであり、Ｐｔ層厚（ｄｒｔ）
は２人≦ｄｏｔ≦３０人である。) is 1≦dca≦15 Å, and the Pt layer thickness (drt)
is 2 people≦dot≦30 people.
次に上記構成の熱磁気記録媒体を用いて磁気特性評価を
行った結果について説明する。この実験には、Ｃｏ／Ｐ
ｔ人工格子膜１０としてＣｏ層厚ａｃｅが５人、Ｐｔ層
厚ａｒｔが１５人となるように周期的に積層したものを
用いている。この熱磁気記録媒体１１を評価したところ
、残留磁束密度は１Ｃｏ０Ｇａｕｓｓ以上であり、磁性
体であるトナーの咬着に必要とされる十分な磁気力を発
生する。さらに、キューり温度は２Ｃｏ ’Ｃ以下で低
い値を持ち、保持力は１ＣｏＣｏｅ以上となる。Next, the results of magnetic property evaluation using the thermomagnetic recording medium having the above configuration will be explained. This experiment involved Co/P
As the t-superlattice film 10, a film in which the Co layer thickness ace is 5 layers and the Pt layer thickness art is 15 layers is used. When this thermomagnetic recording medium 11 was evaluated, it was found that the residual magnetic flux density was 1 Co0 Gauss or more, and it generated sufficient magnetic force required to stick the toner, which is a magnetic substance. Furthermore, the cue temperature has a low value below 2 Co'C, and the coercive force has a value of 1 CoCoe or above.
第２図は本発明の他の熱磁気記録媒体を示す図、第２図
（Ａ）は熱磁気記録媒体の断面図、第２図（Ｂ）は記録
用磁気ドラムの断面図である。FIG. 2 is a diagram showing another thermomagnetic recording medium of the present invention, FIG. 2(A) is a sectional view of the thermomagnetic recording medium, and FIG. 2(B) is a sectional view of a recording magnetic drum.
図において、厚さが数十〜数百ミクロンの曲折自在なス
テンレス基板８上に、ＲＦスパッタ法を用いて垂直磁化
膜、すなわち数百ミクロンの膜厚を有するＣｏ／Ｐｄ人
工格子膜１４が積層されて熱磁気記録媒体１５が形成さ
れる。該熱磁気記録媒体１５はシート状に形成され、記
録用磁気ドラム芯材１２上に巻き付けられる。In the figure, a perpendicularly magnetized film, that is, a Co/Pd superlattice film 14 having a thickness of several hundred microns is laminated using RF sputtering on a bendable stainless steel substrate 8 with a thickness of several tens to hundreds of microns. Then, a thermomagnetic recording medium 15 is formed. The thermomagnetic recording medium 15 is formed into a sheet shape and is wound onto the recording magnetic drum core material 12 .
上記Ｃｏ／Ｐｄ人工格子１Ｉ１１４のＣＯ層厚（ｄｃ。CO layer thickness (dc) of the above Co/Pd superlattice 1I114.
）は１人≦ｄｃｏ≦１５人であり、Ｐｄ層厚（ｄ ｒａ
＞ は２人≦ｄＰｘ≦３０人である。) is 1 person≦dco≦15 people, and the Pd layer thickness (d ra
> is 2 people≦dPx≦30 people.
次に上記構成の熱磁気記録媒体を用いて磁気特性評価を
行った結果について説明する。この実験には、Ｃｏ／Ｐ
ｄ人工格子膜１４としてＣＯ層層厚 ｃｏが５人、ｐｄ
ｌｌ厚ｄ１が１５人となるように周期的に積層してもの
を用いている。この熱磁気記録媒体１５を評価したとこ
ろ、残留磁束密度は１Ｃｏ０Ｇａｕｓｓ以上であり、磁
性体であるトナーの吸着に必要とされる十分な磁気力を
発生する。さらに、キューリ温度は２Ｃｏ ’Ｃ以下で
低い値を持ち、保持力は１ＣｏＣｏｅ以上となる。Next, the results of magnetic property evaluation using the thermomagnetic recording medium having the above configuration will be explained. This experiment involved Co/P
d CO layer thickness as the artificial lattice film 14 co is 5 people, pd
The layers are periodically laminated so that the thickness d1 is 15. When this thermomagnetic recording medium 15 was evaluated, it was found that the residual magnetic flux density was 1 Co0 Gauss or more, and it generated sufficient magnetic force required to attract toner, which is a magnetic substance. Further, the Curi temperature has a low value below 2 Co'C, and the holding power has a value of 1 CoCoe or above.
第３図は本発明の熱磁気記録媒体の人工格子膜の断面図
である。FIG. 3 is a cross-sectional view of the artificial lattice film of the thermomagnetic recording medium of the present invention.
図に示すように、Ｃｏ層とＰｔ層が交互に又はＣｏ層と
Ｐｄ層が交互に積層される。As shown in the figure, Co layers and Pt layers are alternately laminated, or Co layers and Pd layers are alternately laminated.
なお、本発明は上記実施例に限定されるものではなく、
本発明の趣旨に基づいて種々の変形が可能であり、これ
らを本発明の範囲から排除するものではない。Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
例えば、上記実施例においては、熱磁気記録媒体１．１
．１５の基板としてステンレス基板８を用いているが、
非磁性体であるポリイミド樹脂基板を利用してもよい。For example, in the above embodiment, the thermomagnetic recording medium 1.1
．． Although the stainless steel substrate 8 is used as the substrate 15,
A polyimide resin substrate, which is a non-magnetic material, may also be used.
また、熱磁気記録媒体１１．１５を応用した例として熱
磁気プリンタを示しているが、熱及び光の照射により記
録を行う他の記録装置にも応用することができる。また
、人工格子膜１０．１４の膜厚を数百ミクロンとし、ス
テンレス基板８の板厚を数十〜数百ミクロンとしている
が、これらの厚さは用途に応して変化させることができ
る。Further, although a thermomagnetic printer is shown as an example to which the thermomagnetic recording medium 11.15 is applied, it can also be applied to other recording devices that perform recording by irradiation of heat and light. Further, the thickness of the artificial lattice film 10.14 is several hundred microns, and the thickness of the stainless steel substrate 8 is several tens to several hundreds of microns, but these thicknesses can be changed depending on the application.
（発明の効果）
以上詳細に説明したように、本発明によれば、熱磁気記
録媒体はキューリ点が低くかつ残留磁束密度の高い垂直
磁化膜であるＣｏ／Ｐｔ人工格子膜又はＣｏ／Ｐｄ人工
格子膜により形成される。(Effects of the Invention) As described above in detail, according to the present invention, the thermomagnetic recording medium is a Co/Pt artificial lattice film or a Co/Pd artificial It is formed by a lattice film.
したがって、垂直記録を行う磁気記録法に通用すること
ができ、高い磁気記録密度を得ることができる。そして
、例えば熱磁気プリンタにこれを用いた場合、解像度を
高くし消費電力を低減することができる。Therefore, it can be used in magnetic recording methods that perform perpendicular recording, and high magnetic recording density can be obtained. For example, when this is used in a thermomagnetic printer, resolution can be increased and power consumption can be reduced.
第１図は本発明の熱磁気記録媒体を示す図、第１図（Ａ
）は熱磁気記録媒体の断面図、第１図（Ｂ）は記録用磁
気ドラムの断面図、第２図は本発明の他の熱磁気記録媒
体を示す図、第２図（＾）は熱磁気記録媒体の断面図、
第２図（Ｂ）は記録用磁気ドラムの断面図、第３図は本
発明の熱磁気記録媒体の人工格子膜の断面図、第４図は
従来の熱磁気プリンタの印刷プロセス図である。
８・・・ステンレス基板、１０・・・Ｃｏ／Ｐｔ人工格
子膜、１１．１５・・・熱磁気記録媒体、１２・・・記
録用磁気ドラム芯材、１４・・・Ｃｏ／Ｐｄ人工格子膜
。
特許出願人 沖電気工業株式会社
代理人 弁理士 川 合 誠（外１名）未発明つ慇磁
五記・轢媒体Ｅ示を２
第
図
米発明呵也。熱、磁汽記健媒体と示す２第
図
旧１FIG. 1 is a diagram showing a thermomagnetic recording medium of the present invention, FIG.
) is a sectional view of a thermomagnetic recording medium, FIG. 1(B) is a sectional view of a recording magnetic drum, FIG. 2 is a diagram showing another thermomagnetic recording medium of the present invention, and FIG. A cross-sectional view of a magnetic recording medium,
FIG. 2(B) is a sectional view of a recording magnetic drum, FIG. 3 is a sectional view of an artificial lattice film of a thermomagnetic recording medium of the present invention, and FIG. 4 is a printing process diagram of a conventional thermomagnetic printer. 8...Stainless steel substrate, 10...Co/Pt superlattice film, 11.15...Thermomagnetic recording medium, 12...Magnetic drum core material for recording, 14...Co/Pd superlattice film . Patent Applicant: Oki Electric Industry Co., Ltd. Agent, Patent Attorney: Makoto Kawai (1 other person) Uninvented Pentacles of Pentacles and Media E Showing 2 Figure 2: Inventor of Rice. Heat, magnetism record medium and 2nd figure old 1
Claims (2)
膜とを有し、 （ｃ）上記人工格子膜が、Ｃｏ層とＰｔ層を交互に積層
したＣｏ／Ｐｔ人工格子膜又はＣｏ層とＰｄ層を交互に
積層したＣｏ／Ｐｄ人工格子膜であることを特徴とする
熱磁気記録媒体。(1) It has (a) a substrate, (b) a perpendicular magnetization film made of an artificial lattice film laminated on the substrate, and (c) the artificial lattice film has Co layers and Pt layers alternately laminated. A thermomagnetic recording medium characterized in that it is a Co/Pt superlattice film or a Co/Pd superlattice film in which Co layers and Pd layers are alternately laminated.
ｄ＿Ｃ＿ｏ≦１５Å であり、Ｐｔ層厚又はＰｄ層厚ｄ＿Ｐ＿ｘが２Å≦ｄ＿
Ｐ＿ｘ≦３０Å である請求項１記載の熱磁気記録媒体。(2) The above superlattice film has a Co layer thickness d_C_o of 1 Å≦
d_C_o≦15 Å, and Pt layer thickness or Pd layer thickness d_P_x is 2 Å≦d_
The thermomagnetic recording medium according to claim 1, wherein P_x≦30 Å.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13713690A JPH0431871A (en) | 1990-05-29 | 1990-05-29 | Thermomagnetic recording medium |
| EP91108719A EP0459413B1 (en) | 1990-05-29 | 1991-05-28 | Method for fabricating a magnetic recording medium |
| DE69117350T DE69117350T2 (en) | 1990-05-29 | 1991-05-28 | Process for the production of magnetic recording media |
| US08/150,283 US5604030A (en) | 1990-05-29 | 1993-11-10 | Magnetic recording medium method and apparatus for fabricating same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13713690A JPH0431871A (en) | 1990-05-29 | 1990-05-29 | Thermomagnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0431871A true JPH0431871A (en) | 1992-02-04 |
Family
ID=15191665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13713690A Pending JPH0431871A (en) | 1990-05-29 | 1990-05-29 | Thermomagnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0431871A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5604577A (en) * | 1994-04-27 | 1997-02-18 | Sharp Kabushiki Kaisha | Double-side image forming apparatus and reverse sheet feeding device |
| US6881497B2 (en) | 2001-06-04 | 2005-04-19 | Hitachi Global Storage Technologies Netherlands B.V. | ‘Thermal spring’ magnetic recording media for writing using magnetic and thermal gradients |
-
1990
- 1990-05-29 JP JP13713690A patent/JPH0431871A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5604577A (en) * | 1994-04-27 | 1997-02-18 | Sharp Kabushiki Kaisha | Double-side image forming apparatus and reverse sheet feeding device |
| US6881497B2 (en) | 2001-06-04 | 2005-04-19 | Hitachi Global Storage Technologies Netherlands B.V. | ‘Thermal spring’ magnetic recording media for writing using magnetic and thermal gradients |
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