JPH0378115A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0378115A JPH0378115A JP1214490A JP21449089A JPH0378115A JP H0378115 A JPH0378115 A JP H0378115A JP 1214490 A JP1214490 A JP 1214490A JP 21449089 A JP21449089 A JP 21449089A JP H0378115 A JPH0378115 A JP H0378115A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic recording
- recording medium
- coercive force
- hexagonal ferrite
- 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 49
- 239000006247 magnetic powder Substances 0.000 claims abstract description 14
- 229910020517 Co—Ti Inorganic materials 0.000 claims abstract description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 10
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical group [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 claims description 2
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 2
- 229910014474 Ca-Sn Inorganic materials 0.000 claims 1
- 229910019074 Mg-Sn Inorganic materials 0.000 claims 1
- 229910019382 Mg—Sn Inorganic materials 0.000 claims 1
- 239000006249 magnetic particle Substances 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- 230000005415 magnetization Effects 0.000 abstract description 15
- 238000006467 substitution reaction Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000000034 method 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
- 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
- 238000005259 measurement 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
- 239000010936 titanium Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000203 mixture 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
- 230000007704 transition Effects 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
- 239000003513 alkali 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
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 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
- 150000002823 nitrates Chemical class 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
- 239000000843 powder Substances 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
- YJVLWFXZVBOFRZ-UHFFFAOYSA-N titanium zinc Chemical group [Ti].[Zn] YJVLWFXZVBOFRZ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
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／Ｈ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 relates to a magnetic recording medium with particularly excellent C/H for use in video tapes, floppy disks, etc. that require high-density recording in the submicron region. It is related to.
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ければならないため
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
むためには磁気へン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 head. 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、文献としては白木、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 Shiraki, Nakamura, and Iwasaki, Journal of the Japan Society for Applied Magnetics, Vol. 11 (1987)). There are P109-114)
.
垂直記録では、高記録密度になればなるほど自己ｔｓ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６０−１３２
１８３号公報等がある）。In perpendicular recording, the higher the recording density, the smaller the self-ts magnetic loss, and research and development are being carried out in various fields as the ultimate magnetic recording method (for example, Japanese Patent Application Laid-Open No. 60-132
(Publication No. 183, etc.)
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、特開昭６０−
２１２８１７号公報、特開昭６１−２３０６２１号公報
、特開昭６２−６０１２２号公報等がある）。On the other hand, there are also reports of application to perpendicular magnetic recording systems using hexagonal plate-shaped barium ferrite magnetic powder (for example, JP-A-60-211628, JP-A-60-
212817, JP 61-230621, JP 62-60122, 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置換型のヘキサゴナル
フェライトではなく、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 have decided to use a specific substitution element other than Co-Ti instead of the Co-Ti substitution type hexagonal ferrite that has been mainly used in the past. It has been found that a high-density magnetic recording medium can be obtained by this method.
作用
本発明は、従来−船釣に用いられてきたＣｏ−Ｔｉ添加
ではなく、Ｃｏ−Ｔｉ以外の特定元素添加によりｃｏの
マイグレーションにより生じ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Ｃ
ｏ−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媒体の電
磁変換特性の出力及びＣ／Ｎが改善される。Function The present invention is capable of preventing deterioration of magnetic properties caused by migration of co, by adding a specific element other than Co-Ti, instead of adding Co-Ti, which has been conventionally used for boat fishing, and reduces coercive force and improves magnetic properties. It becomes possible to simultaneously stabilize the characteristics. This causes the magnetic layer of the recording medium to
By being composed of hexagonal ferrite magnetic powder containing a specific substitution element other than o-Ti, the coercive force distribution is sharp and the magnetization transition occurs steeply, resulting in a decrease in the output and C/N of the electromagnetic conversion characteristics of the medium. 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図面を
用いて詳細に説明する。EXAMPLE Hereinafter, a magnetic recording medium according to an example of the present invention will be described in detail with reference to the drawings.
バリウム、鉄、亜鉛及びチタンの硝酸塩をモル比でそれ
ぞれ１対１１対０．５対０．５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、アルカリ成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
タン置換型へキサゴナルフェ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成っていた。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０Ｍ１気特性の測定結果から、保磁力１０００エ
ルステツド、飽和磁化５８．Ｏｅｍｕ ７ｇであった。An aqueous sodium hydroxide solution was added dropwise to an aqueous solution containing nitrates of barium, iron, zinc, and titanium in a molar ratio of 1:11:0.5:0.5, respectively, to obtain a coprecipitate. The coprecipitate was thoroughly washed with water to completely remove the alkali component, and then heat treated at 850''C for 2 hours to obtain zinc-titanium substituted hexagonal ferrite magnetic powder.The resulting magnetic The X-ray diffraction pattern of the powder showed that it was composed of a single M-type barium ferrite phase.In addition, observation using a transmission electron microscope revealed that the average particle size was plate-shaped particles with an average particle size of 350 to 800. Therefore, the coercive force was 1000 Oersted, and the saturation magnetization was 58.Oemu 7g.
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グ
ーにより硬練り分散した後、ダブルプラネタリ−ミキサ
ーを用いてレットダウンし、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ミクロンペーバーフィ
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メソ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。For 100 parts by weight of the obtained magnetic powder, 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. parts by weight of a lubricant.
After adding 5 parts by weight and 320 parts by weight of an organic solvent, the mixture was hard kneaded and dispersed using a continuous Ni-Goo, then let 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 paver filter to remove impurities. The paint after filtration was coated with 14 μm thick PET (polyethylene terephthalate) using a 120 mS microgravure plate.
The mixture was applied onto a film, dried, calendered, and cut into a predetermined size and width to produce a magnetic recording medium (sample for measurement).
ここで、比較例１としてＣｏ−Ｔｉ添加型へキサゴナル
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-added 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添加型へキ
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。Fig. 1 shows the magnetization curve of the magnetic recording medium obtained in this example, and Fig. 2 shows the magnetization curve obtained in the same manner as in the example except that Co-Ti-added hexagonal ferrite was used as the magnetic powder. The magnetization curve of the produced magnetic recording medium of Comparative Example 1 is shown.
なお、実線で示した曲線は飽和磁化履歴曲線を、破線で
示した・曲線は残留磁化Ｈ原曲線を示す。第１図、第２
図より明らかなようにＣｏ−Ｔｉ添加型のものよりも本
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
がより象、峻であり、角型性も良くなっているのがわか
る。In addition, the curve shown by a solid line is a saturation magnetization history curve, and the curve shown by a broken line is a residual magnetization H original curve. Figures 1 and 2
As is clear from the figure, 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 doped type, and the squareness is also better. I understand.
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表−１に示した。Next, Table 1 shows the measurement results of tape playback output and magnetic properties of the obtained sample.
測定には、ギヤノブ長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５．８ ｍ ／ｓｅｅ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。表−１において、明らかなようにＣｏ−Ｔ
ｉ添加型のへキサゴナルフェ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, gear knob length is 0.2 microns, track width is 23
A Micron MIG type magnetic head was used at a tape head relative speed of 5.8 m/see. 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 Co-T
In media using i-doped hexagonal ferrite, the output decreases more as the frequency goes up, but in the case of the present invention, the tape playback output exceeds that of commercially available metal tapes.
It can be seen that the recording density is higher.
（以 下 余 白）
表−１
また、ＳＦＤ、ＳＦＤ’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
。(Margins below) Table 1 In addition, SFD and SFD' are very small compared to other comparative examples, suggesting that the magnetization transition occurs more steeply.
他の実施例として、添加元素としてＮｉ−Ｔｉ。As another example, Ni-Ti is used as the additive element.
Ｓｎ−Ｍｇ、Ｃａ−Ｓｎ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。Similar results were obtained when Sn--Mg, Ca--Sn, etc. were used in the same manner.
発明の効果
以上のように、本発明の磁気記録媒体は、磁性Ｈに使用
する磁性粉体にＣｏ−Ｔｉ以外の特性安定化添加元素を
用いであるので磁気特性及び電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、高信顛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
に寄与するところ大であり、有用な発明である。Effects of the Invention As described above, the magnetic recording medium of the present invention uses a property stabilizing additive element other than Co-Ti in the magnetic powder used for the magnetic H, so that the magnetic properties and electromagnetic conversion properties can be improved. I can do it. 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Ｉ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。
ｌ・・・・・・飽和磁化履歴曲線、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 I. l... Saturation magnetization history curve, 2... Residual magnetization history curve.
Claims (1)
ルム基体及び磁性フィルムが前記基体上に塗布された単
一層であり、Ｃｏ−Ｔｉを含有しないで、保持力を５０
０〜２０００エルステッドまで制御した磁気記録用ヘキ
サゴナルフェライト磁性粉体が、分散された複数の板状
磁性粉体を有する前記磁性フィルムから成ることを特徴
とする磁気記録媒体。（２）保磁力を制御するために置
換する元素の組み合わせが、Ｎｉ−Ｔｉ、Ｚｎ−Ｔｉ、
Ｍｇ−Ｓｎ、Ｃａ−Ｓｎの中から選ばれる一種以上の元
素の組み合わせで表せられる請求項（１）記載の磁気記
録媒体。(1) A film-type magnetic recording medium, in which one film substrate and a magnetic film are a single layer coated on the substrate, do not contain Co-Ti, and have a coercive force of 50
1. A magnetic recording medium comprising the above-mentioned magnetic film having a plurality of plate-shaped magnetic particles in which hexagonal ferrite magnetic powder for magnetic recording controlled to 0 to 2000 Oe is dispersed. (2) The combination of elements to be substituted to control the coercive force is Ni-Ti, Zn-Ti,
The magnetic recording medium according to claim 1, which is represented by a combination of one or more elements selected from Mg-Sn and Ca-Sn.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1214490A JPH0378115A (en) | 1989-08-21 | 1989-08-21 | Magnetic recording medium |
| KR1019900012871A KR930004444B1 (en) | 1989-08-21 | 1990-08-21 | Magnetic recording medium |
| US07/571,093 US5114801A (en) | 1989-08-21 | 1990-08-21 | Magnetic recording medium having a magnetic layer comprising hexagonal barium ferrite magnetic particles containing tin and magnesium in specified proportions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1214490A JPH0378115A (en) | 1989-08-21 | 1989-08-21 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0378115A true JPH0378115A (en) | 1991-04-03 |
Family
ID=16656579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1214490A Pending JPH0378115A (en) | 1989-08-21 | 1989-08-21 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0378115A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6410604A (en) * | 1987-07-03 | 1989-01-13 | Hitachi Maxell | Magnetic powder and manufacture thereof; magnetic recording medium using same |
| JPH01123403A (en) * | 1987-11-06 | 1989-05-16 | Toda Kogyo Corp | Planer magnetoplumbite type ferrite fine-grain powder for magnetic recording |
-
1989
- 1989-08-21 JP JP1214490A patent/JPH0378115A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6410604A (en) * | 1987-07-03 | 1989-01-13 | Hitachi Maxell | Magnetic powder and manufacture thereof; magnetic recording medium using same |
| JPH01123403A (en) * | 1987-11-06 | 1989-05-16 | Toda Kogyo Corp | Planer magnetoplumbite type ferrite fine-grain powder for magnetic recording |
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