JPH03238619A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH03238619A JPH03238619A JP2036463A JP3646390A JPH03238619A JP H03238619 A JPH03238619 A JP H03238619A JP 2036463 A JP2036463 A JP 2036463A JP 3646390 A JP3646390 A JP 3646390A JP H03238619 A JPH03238619 A JP H03238619A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic recording
- recording medium
- medium
- magnetic 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 55
- 239000006247 magnetic powder Substances 0.000 claims abstract description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 8
- 229910020994 Sn-Zn Inorganic materials 0.000 claims abstract description 5
- 229910009069 Sn—Zn Inorganic materials 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims abstract 2
- 230000005415 magnetization Effects 0.000 abstract description 15
- 229910020517 Co—Ti Inorganic materials 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- YLOGFLJZZLICCB-UHFFFAOYSA-N [Ti].[Sn].[Zn] Chemical group [Ti].[Sn].[Zn] YLOGFLJZZLICCB-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- YQMWDQQWGKVOSQ-UHFFFAOYSA-N trinitrooxystannyl nitrate Chemical class [Sn+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YQMWDQQWGKVOSQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明−は、サブミクロン領域での高密度記録を必要と
するビデオテープやフロッピーディスク等に使用するた
めの、特にＣ／Ｎの優れた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 is directed to magnetic recording with particularly excellent C/N for use in video tapes, floppy disks, etc. that require high-density recording in the submicron region. It's about the medium.
従来の技術
磁気記録は、従来より磁気記録媒体の面内方向の磁化を
用いる長手磁気記録方式によって発展してきた。現在使
われている磁気記録媒体の大部分は、この長手磁気記録
方式によるものである。BACKGROUND OF THE INVENTION Magnetic recording has traditionally been developed using a longitudinal magnetic recording method that uses in-plane magnetization of a magnetic recording medium. Most of the magnetic recording media currently in use are based on this longitudinal magnetic recording method.
媒体を構成する磁性材料としては、現状では針状形状の
酸化鉄やメタル系の磁性粉が主流であり、さらに塗布膜
の強度の増大と磁気ヘッド表面の研磨性を上げるための
アルミナや酸化クロムを、電気抵抗を低減し媒体の走行
性を向上するためのカーボンを、走行性と媒体の耐久性
向上のための潤滑剤等を有機バインダー中で均一に分散
させ磁性塗布膜を得ている。At present, the main magnetic materials that make up the media are needle-shaped iron oxide and metal-based magnetic powders, and alumina and chromium oxide are also used to increase the strength of the coating film and improve the abrasiveness of the magnetic head surface. A magnetic coating film is obtained by uniformly dispersing carbon, which reduces electrical resistance and improves the runnability of the medium, and lubricants, which improves the runnability and durability of the medium, in an organic binder.
一般に長手磁気記録では出力の増大を図るために、媒体
塗布膜中の磁性粉体はヘッド−媒体の走行方向に配向さ
れていることが要求される。長手磁気記録方式では、塗
布膜中の磁性粉体の長手配向の程度が大きいほど、高密
度記録時でのＣ／Ｎは増大することから、長手配向度の
増大が試みられている（例えば、特開昭６２−１７２５
３３号公報、特開昭６２−２１９３３２号公報、特開昭
６２−２９８９２７号公報などに示されている）。Generally, in longitudinal magnetic recording, in order to increase the output, it is required that the magnetic powder in the medium coating film be oriented in the head-medium running direction. In the longitudinal magnetic recording method, attempts have been made to increase the longitudinal orientation because the greater the longitudinal orientation of the magnetic powder in the coating film, the higher the C/N during high-density recording. For example, JP-A-62-1725
33, JP-A-62-219332, JP-A-62-298927, etc.).
しかしながら、長手磁気記録方式では高密度記録時に、
自己減磁損失に打ち勝って記録しなげればならないため
に媒体の高保磁力化が高密度記録のための必須条件であ
ることが知られている。ところが、現行の針状形状の酸
化鉄やメタル磁性粉も現状以上の高保磁力化は技術的に
困難な状況にあり、また高保磁力の媒体を充分に書き込
むためには磁気へノドの方にもまだまだ問題があるのが
現状である。However, in the longitudinal magnetic recording method, during high-density recording,
It is known that increasing the coercive force of the medium is an essential condition for high-density recording because recording must be performed while overcoming self-demagnetization loss. However, it is technically difficult to increase the coercive force of the current needle-shaped iron oxide and metal magnetic powders even higher than the current level, and in order to sufficiently write on high coercive force media, it is necessary to improve the magnetic nodal direction. At present, there are still problems.
これら長手磁気記録の課題を解決する方法として、垂直
磁気記録方式が提案されていることはよく知られている
（例えば、文献としては小本、中村岩崎 日本応用磁気
学会誌１１巻（１９８７）Ｐ１０９〜１１４がある）。It is well known that perpendicular magnetic recording has been proposed as a method to solve these problems with longitudinal magnetic recording (for example, see Komoto, Nakamura Iwasaki, Journal of the Japanese Society for Applied Magnetics, Vol. 11 (1987), p. 109. ~114).
垂直記録では、高記録密度になればなるほど自己減磁損
失が小さくなり、究極の磁気記録方式として研究開発が
各方面で行われている（例えば、特開昭６０−１３２１
８３号公報）。In perpendicular recording, the higher the recording density, the smaller the self-demagnetization loss, and research and development are being carried out in various fields as the ultimate magnetic recording method (for example,
Publication No. 83).
また、一方、六角板状形状のバリウムフェライト磁性粉
体を利用して垂直磁気記録方式に適用した報告もある（
例えば、特開昭６０−２１１６２８号公報。On the other hand, there is also a report on the application of hexagonal plate-shaped barium ferrite magnetic powder to perpendicular magnetic recording (
For example, Japanese Patent Application Laid-Open No. 60-211628.
特開昭６０−２９９２８号公報、特開昭６０−２１２８
１７号公報。JP-A-60-29928, JP-A-60-2128
Publication No. 17.
特開昭６１−２３０６２１号公報、特開昭６２６０１２
２号公報等がある）。JP-A-61-230621, JP-A-626012
(There are Publications No. 2, etc.)
発明が解決しようとする課題
しかし、現在塗布型の磁気記録媒体の開発において、先
行技術で開示されたように単に板状形状の磁性粉体を塗
料化して塗布してもそのメディア特性は必ずしも良好で
あるとは言い難い。具体的には、市販のメタルテープの
サブミクロンの記録波長での出力、Ｃ／Ｎと比較しても
必ずしも優位とは言えないという課題を有していた。Problems to be Solved by the Invention However, in the current development of coating-type magnetic recording media, it is not always possible to obtain good media characteristics even if a plate-shaped magnetic powder is simply applied as a paint, as disclosed in the prior art. It is difficult to say that it is. Specifically, it has had the problem that it cannot necessarily be said to be superior when compared with the output and C/N of commercially available metal tapes at submicron recording wavelengths.
課題を解決するための手段
上記課題を解決するために鋭意研究をすすめた結果、従
来主に使用されてきたＣｏ−Ｔｉ置換型のへキサゴナル
フエライトではなく、Ｃｏ−Ｔｉ以外の特定の置換元素
を用いることにより、高密度磁気記録媒体が得られるこ
とを見出した。Means for Solving the Problems As a result of intensive research to solve the above problems, we found that instead of the Co-Ti substitution type hexagonal ferrite that had been mainly used, we developed a substituted element other than Co-Ti. It has been discovered that a high-density magnetic recording medium can be obtained by using.
作用
本発明は、従来−船釣に用いられてきたＣ０Ｔ１置換で
はなく、Ｃｏ−Ｔｉ以外の特定元素置換により、従来主
していた磁気特性の劣化を防止でき、保磁力低減と磁気
特性の安定化および向上を同時に図ることが可能となる
。これにより、記録媒体の磁性層が該Ｃｏ−Ｔｉ以外の
特定置換元素を含むヘキサゴナルフェライト磁性粉体よ
り構成することにより、保磁力分布の鋭敏でかつ、磁化
転移が急峻に起こるようになり、しかも媒体の磁化値向
上が可能となり、媒体の！磁変換特性の出力及びＣ／Ｎ
が改善される。Function The present invention uses specific element substitution other than Co-Ti, rather than the C0T1 substitution conventionally used for boat fishing, to prevent deterioration of magnetic properties, which has been the main problem in the past, reducing coercive force and stabilizing magnetic properties. This makes it possible to simultaneously improve and improve performance. As a result, the magnetic layer of the recording medium is composed of hexagonal ferrite magnetic powder containing a specific substitution element other than the Co-Ti, so that the coercive force distribution is sharp and the magnetization transition occurs steeply. It is possible to improve the magnetization value of the media, and the media's! Output and C/N of magnetic conversion characteristics
is improved.
実施例
以下、本発明の一実施例の磁気記録媒体について述べる
。EXAMPLE A magnetic recording medium according to an example of the present invention will be described below.
バリウム、鉄、亜鉛、チタン、およびスズの硝酸塩をモ
ル比でそれぞれ１対１１対０．２５対０．５対０．２５
の割合で含む水溶液に水酸化ナトリウム水溶液を滴下し
、共沈物を得た。該共沈物を充分に水洗処理し、アルカ
リ酸分を完全に除去した後、８５０ ”Ｃで２時間熱処
理することにより亜鉛−チタン−スズ置換型へキサゴナ
ルフエライト磁性粉体を得た。得られた磁性粉体のＸ線
回折パターンは、Ｍ型のバリウムフェライト単相から威
っていた。また、透過型電子顕微鏡観察によると平均粒
径３５０〜８００人の板状粒子であった。磁気特性の測
定結果から、保磁力１０００エルステツド、飽和磁化６
１．４ｅｍｕ／ｇであった。得られた磁性粉体を１００
重量部に対して、塩化ビニル系樹脂１２重量部、ポリウ
レタン系樹脂８重量部、カーボンブラック１重量部、ア
ルミナ６重量部、潤滑剤２．５重量部、有機溶剤３２０
重量部を添加し連続型ニーダ−により硬練り分散した後
、ダブルプラネタリ−ミキサーを用いてレフトダウンし
、その後サンドミルにより混合分散して磁性塗料を作製
した。さらに前記溶剤により磁性塗料をレットダウンし
、ポリイソシアネート５重量部添加し、混合分散した後
０．１ミクロンペーパーフィルターで磁性塗料を濾過し
、不純物等を濾別した。濾別後の塗料を１２０メツシユ
のマイクログラビア版を用いて１４μｍ厚のＰＥＴ（ポ
リエチレンテレフタレート）フィルム上に塗布し乾燥さ
せ、カレンダ処理を行い所定の寸法幅に切断し、磁気記
録媒体（測定用サンプル）を作製した。Barium, iron, zinc, titanium, and tin nitrates in molar ratios of 1:11:0.25:0.5:0.25, respectively.
An aqueous sodium hydroxide solution was added dropwise to an aqueous solution containing a proportion of . The coprecipitate was thoroughly washed with water to completely remove the alkaline acid content, and then heat treated at 850''C for 2 hours to obtain zinc-titanium-tin substituted hexagonal ferrite magnetic powder. The X-ray diffraction pattern of the obtained magnetic powder showed that it was a single phase of M-type barium ferrite. Furthermore, observation using a transmission electron microscope showed that it was a plate-shaped particle with an average particle size of 350 to 800 particles. From the measurement results of the characteristics, the coercive force is 1000 oersted, and the saturation magnetization is 6.
It was 1.4 emu/g. The obtained magnetic powder was
Based on parts by weight, 12 parts by weight of vinyl chloride resin, 8 parts by weight of polyurethane resin, 1 part by weight of carbon black, 6 parts by weight of alumina, 2.5 parts by weight of lubricant, 320 parts by weight of organic solvent.
Parts by weight were added and hard kneaded and dispersed using a continuous kneader, left-down using a double planetary mixer, and then mixed and dispersed using a sand mill to prepare a magnetic paint. Further, the magnetic paint was let down with the above solvent, 5 parts by weight of polyisocyanate was added, mixed and dispersed, and then the magnetic paint was filtered through a 0.1 micron paper filter to remove impurities. The filtered paint was applied onto a 14 μm thick PET (polyethylene terephthalate) film using a 120-mesh microgravure plate, dried, calendered and cut into a predetermined size and width, and a magnetic recording medium (measurement sample ) was created.
ここで、比較例１としてＣｏ−Ｔｉ置換型へキサゴナル
フェライトを磁性粉体とした以外は本実施例と同様な方
法で作製したサンプルを、また比較例２として市販のメ
タルテープを測定サンプルとした。Here, as Comparative Example 1, a sample was prepared in the same manner as in this example except that Co-Ti substituted hexagonal ferrite was used as the magnetic powder, and as Comparative Example 2, a commercially available metal tape was used as the measurement sample. did.
第１図には本実施例で得られた磁気記録媒体の磁化曲線
を、第２図は磁性粉体としてＣｏ−Ｔｉ置換型へキサゴ
ナルフェライトを用いた以外は実施例と同様にして作製
した比較例１の磁気記録媒体の磁化曲線を示した。第１
図および第２図より明らかなようにＣｏ−Ｔｉ置換型の
ものよりも本発明の媒体の残留磁化成分の履歴の方が第
２象限の部分がより急峻であり、角型性も良くなってい
るのがわかる。Fig. 1 shows the magnetization curve of the magnetic recording medium obtained in this example, and Fig. 2 shows the magnetization curve of the magnetic recording medium obtained in this example. The magnetization curve of the magnetic recording medium of Comparative Example 1 is shown. 1st
As is clear from the figures and FIG. 2, the history of the residual magnetization component of the medium of the present invention is steeper in the second quadrant than that of the Co-Ti substitution type, and the squareness is also better. I can see that you are there.
次に得られたサンプルのテープ再生出力の測定結果及び
磁気特性の測定結果を第１表に示した。Next, Table 1 shows the measurement results of tape playback output and magnetic properties of the obtained samples.
測定には、ギャップ長０．２ミクロン、トラック幅２３
ミクロンのＭＩＧ型磁気ヘッドを用い、テープヘッドの
相対速度５．８ｍ／ｓｅｃで行った。なお、テープ再生
出力は比較例２のメタルテープを基準とした相対値で表
示した。第１表において、明らかなようにＣｏ−Ｔｉ置
換型のへキサゴナルフエライトを用いた媒体では高域に
いくほど出力の低下が大きくなるが、本発明の場合には
市販のメタルテープを凌ぐテープ再生出力を示し、より
高記録密度化されていることがわかる。For measurements, a gap length of 0.2 microns and a track width of 23
The recording was carried out using a Micron MIG type magnetic head at a tape head relative speed of 5.8 m/sec. Note that the tape playback output is expressed as a relative value based on the metal tape of Comparative Example 2. In Table 1, it is clear that with media using Co-Ti substituted hexagonal ferrite, the output decreases more toward the higher frequencies, but in the case of the present invention, the tape outperforms commercially available metal tapes. The reproduction output is shown, and it can be seen that the recording density has been increased.
第１表
ここでＳＦＤは、第１図および第２図に示した飽和磁気
履歴曲線における微分曲線から求めたスイッチング磁界
分布である。Table 1 Here, SFD is the switching magnetic field distribution determined from the differential curve in the saturation magnetic hysteresis curve shown in FIGS. 1 and 2.
一方５ＦＤｒは、第１図および第２図に示した残留磁化
履歴曲線から求めたスインチング磁界分布示す。On the other hand, 5FDr shows the switching magnetic field distribution obtained from the residual magnetization history curves shown in FIGS. 1 and 2.
また、ＳＦＤ、５ＦＤｒが、他の比較例に比べて非常に
小さく、磁化転移がより急峻におこることが示唆される
。Furthermore, SFD and 5FDr are very small compared to other comparative examples, suggesting that the magnetization transition occurs more steeply.
他の実施例として、置換元素としてＮｉ−５ｎＺｎ
Ｎｉ−Ｔｉ−Ｚｎ、Ｍｇ−Ｓｎ−Ｚｎ等を用いて同様に
おこなった場合にも同様の結果が得られた。As another example, Ni-5nZn is used as the replacement element.
Similar results were obtained when conducting the same process using Ni-Ti-Zn, Mg-Sn-Zn, etc.
発明の効果
以上のように、本発明の磁気記録媒体は、磁性層に使用
する磁性粉体にＣｏ−Ｔｉ以外の特性置換元素を用いる
ことにより磁気特性及び！磁変換特性を向上させること
ができる。本発明の磁気記録媒体は、低コスト・大容量
・高信頼性の情報記録に応用することが可能であり、オ
ーディオ・ビデオ機器並びにメモリー機器の高性能化に
寄与すること大であり、有用な発明である。Effects of the Invention As described above, the magnetic recording medium of the present invention improves magnetic properties by using a characteristic substitution element other than Co-Ti in the magnetic powder used in the magnetic layer. Magnetic conversion characteristics can be improved. The magnetic recording medium of the present invention can be applied to low-cost, large-capacity, and highly reliable information recording, and will greatly contribute to improving the performance of audio/video equipment and memory equipment, and will be useful. It is an invention.
第１図は本発明の一実施例の磁気記録媒体の磁化曲線図
、第２図は比較例１のＣｏ−Ｔｉ置換型のへキサゴナル
フエライトを用いた磁気記録媒体の磁化曲線図である。
１・・・・・・飽和磁気履歴曲線、２・・・・・・残留
磁化履歴曲線。FIG. 1 is a magnetization curve diagram of a magnetic recording medium according to an example of the present invention, and FIG. 2 is a magnetization curve diagram of a magnetic recording medium using Co--Ti substitution type hexagonal ferrite of Comparative Example 1. 1... Saturation magnetic hysteresis curve, 2... Residual magnetization hysteresis curve.
Claims (1)
、前記磁性層を構成する磁性粉がＮｉ−Ｔｉ−Ｚｎ，Ｍ
ｇ−Ｓｎ−Ｚｎ，Ｎｉ−Ｓｎ−Ｚｎ，Ｓｎ−Ｔｉ−Ｚｎ
の中から選ばれるいずれかひとつの組み合わせを含むヘ
キサゴナルフェライトであることを特徴とする磁気記録
媒体。This is a magnetic recording medium in which a magnetic layer is formed on a film substrate, and the magnetic powder forming the magnetic layer is Ni-Ti-Zn, M
g-Sn-Zn, Ni-Sn-Zn, Sn-Ti-Zn
A magnetic recording medium characterized by being hexagonal ferrite containing any one combination selected from the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2036463A JPH03238619A (en) | 1990-02-16 | 1990-02-16 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2036463A JPH03238619A (en) | 1990-02-16 | 1990-02-16 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03238619A true JPH03238619A (en) | 1991-10-24 |
Family
ID=12470511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2036463A Pending JPH03238619A (en) | 1990-02-16 | 1990-02-16 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03238619A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003022517A (en) * | 2001-07-11 | 2003-01-24 | Dowa Mining Co Ltd | Ferrite magnetic powder for magnetic card |
| US8628860B2 (en) * | 2005-11-24 | 2014-01-14 | Sulzer Metco Ag | Thermal spraying material, a thermally sprayed coating, a thermal spraying method and also a thermally coated workpiece |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01310511A (en) * | 1988-06-08 | 1989-12-14 | Toda Kogyo Corp | Laminar compound ferrite fine powder for magnetic recording and manufacture of it |
| JPH02500474A (en) * | 1986-10-23 | 1990-02-15 | イーストマン・コダック・カンパニー | Method for producing magnetic hexaferrite particles, resulting particles and products containing the same |
-
1990
- 1990-02-16 JP JP2036463A patent/JPH03238619A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02500474A (en) * | 1986-10-23 | 1990-02-15 | イーストマン・コダック・カンパニー | Method for producing magnetic hexaferrite particles, resulting particles and products containing the same |
| JPH01310511A (en) * | 1988-06-08 | 1989-12-14 | Toda Kogyo Corp | Laminar compound ferrite fine powder for magnetic recording and manufacture of it |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003022517A (en) * | 2001-07-11 | 2003-01-24 | Dowa Mining Co Ltd | Ferrite magnetic powder for magnetic card |
| US8628860B2 (en) * | 2005-11-24 | 2014-01-14 | Sulzer Metco Ag | Thermal spraying material, a thermally sprayed coating, a thermal spraying method and also a thermally coated workpiece |
| US9562281B2 (en) | 2005-11-24 | 2017-02-07 | Oerlikon Metco Ag, Wohlen | Thermal spraying material, a thermally sprayed coating, a thermal spraying method and also a thermally coated workpiece |
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