JPH0289218A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0289218A JPH0289218A JP24050788A JP24050788A JPH0289218A JP H0289218 A JPH0289218 A JP H0289218A JP 24050788 A JP24050788 A JP 24050788A JP 24050788 A JP24050788 A JP 24050788A JP H0289218 A JPH0289218 A JP H0289218A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- temp
- recording medium
- coercive force
- powder
- 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
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 14
- 150000002500 ions Chemical class 0.000 claims description 6
- 239000006249 magnetic particle Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 229910052718 tin Inorganic materials 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 abstract description 12
- 230000007423 decrease Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 6
- 230000005347 demagnetization Effects 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 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 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JKTCBAGSMQIFNL-UHFFFAOYSA-N 2,3-dihydrofuran Chemical compound C1CC=CO1 JKTCBAGSMQIFNL-UHFFFAOYSA-N 0.000 description 1
- 241000272525 Anas platyrhynchos Species 0.000 description 1
- 241000219112 Cucumis Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- -1 isocyanate compound Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 210000003126 m-cell Anatomy 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 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〕
本発明は山気記録媒体に係わり、さら／（： ＃ Ｌ、
＜は磁性粉の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mountain recording medium,
< relates to improvement of magnetic powder.
バリウムフェライト扮を代表とする板状六方晶フェライ
ト粉を用い几磁気記録媒体は、金属粉を用いた媒体に比
べ比較的低い保磁力で高い記録密度が達成できるため盛
んに開発が行われている。Magnetic recording media using plate-shaped hexagonal ferrite powder, typically barium ferrite, are being actively developed because they can achieve high recording densities with relatively low coercive force compared to media using metal powder. .
ところが六方晶フェライト粉の保磁力は、温度のと昇と
ともに大きくなる傾向を有しており、これは通常用いら
れる磁気ヘッドの最大磁束音度（Ｂｓ）が温度の上昇と
共に小さくなるという傾向とは逆である。このため、ｄ
１気ディスクで必要なオーバーライド待゛注に問題が生
ずる。すなわち。However, the coercive force of hexagonal ferrite powder tends to increase with increasing temperature, which is different from the tendency that the maximum magnetic flux sonicity (Bs) of commonly used magnetic heads decreases with increasing temperature. It's the opposite. For this reason, d
A problem arises with the override requirement required on single disks. Namely.
室温においてはオーバーフィト特性の良い磁気ディスク
も、装置全体の温度が上昇した場合には、十分なオーバ
ーライドができなくなり、Ｓ／Ｎが低下するという欠点
を有している。Even magnetic disks with good overfit characteristics at room temperature have the disadvantage that when the temperature of the entire device rises, sufficient override is no longer possible and the S/N ratio decreases.
この発明は、板状六方晶フェライトヘッドいたｌｌＢｌ
配気媒体が持っていたに用時の温（ｆ変化によるオーバ
ーライド特性が変化するという欠点を解決し、以って高
石軸性の磁気記録媒体を提供することを目的とする。This invention has a plate-shaped hexagonal ferrite head.
It is an object of the present invention to solve the drawback that the override characteristic of the air distribution medium changes due to changes in temperature (f) during use, and thereby to provide a magnetic recording medium with high axial properties.
本発明者らは、上記の目的をＳ成するため鋭意検討を行
った結果、板状六方晶フェライト粉の化学式ＡＯ・ｎ
（Ｆｅｓ−（ｘ＋ｙ）Ｍｚ”Ｍ；＋）２０ｓ Ｋ２いて
。As a result of intensive studies to achieve the above object, the present inventors found that the chemical formula of plate-shaped hexagonal ferrite powder is AO・n
(Fes-(x+y)Mz”M;+)20s K2.
ｎ（１）ｄとして８〜１２となるよりなＭｉ成にした場
合、それ以外の組成の磁性粉の保磁力が温度の上昇に伴
って増大するものが、逆に温度のと昇とともに減少する
ことを見い出し、このａｌＢ性扮を用い九ｆＢ気記録媒
体上フェライトヘッドなど、従来から用いらｎている磁
気ヘッドとを組み合わせ乏システムとすると記録媒体の
保磁力の温度変化と磁気ヘッドの最大磁束密度の温度変
化の傾向が同一とをり、記録時の温度が高くなってもオ
ーバーライド特性が低下しないことを見い出し１本発明
をなすに至り友。When using a higher Mi composition with n(1)d of 8 to 12, the coercive force of magnetic powders with other compositions increases as the temperature increases, but on the contrary decreases as the temperature increases. We found that if we combine this ALB property with a conventionally used magnetic head such as a ferrite head on a 9fB recording medium to create a low-performance system, the temperature change in the coercive force of the recording medium and the maximum magnetic flux of the magnetic head will be reduced. The inventors discovered that the tendency of density change with temperature is the same, and that the override characteristic does not deteriorate even when the temperature during recording increases, leading to the present invention.
磁気ヘッドの媒体に対する記録能力を示す値の一つに飽
和磁末警度がある。現在広く一般に用いら九でいるフェ
ライトヘッドの８８は、温度の上昇と共に減少し、この
変化率（ΔＢａ／Δｔ）は。One of the values indicating the recording ability of a magnetic head on a medium is the saturation magnetic endpoint. 88 of the ferrite head, which is currently widely used, decreases as the temperature increases, and this rate of change (ΔBa/Δt).
−２０℃から８０℃程度の温度範囲内では、−１０Ｇ／
ｄｅｇから一３０Ｇ／ｄｅＮ程度である。従って記録時
の温度が高い場合には、磁気ヘッドのｌＩＦき込み能力
が低下し、デジタル記録に２いてよく行うオーバーライ
ド方式では、書き換え前の信号を十分消去できないとい
うことが起こる。Within the temperature range of -20℃ to 80℃, -10G/
deg to about -30G/deN. Therefore, when the temperature during recording is high, the IIF writing capability of the magnetic head decreases, and the override method often used in digital recording may not be able to sufficiently erase the signal before rewriting.
板状六方晶フェライト粉を用いた媒体は、その垂直磁化
成分？利用することにより高い記録密度が達成できると
して注目さｎているが、保磁力の温度変化率が正、つま
り、温度の上昇とともに保磁力が増大する。この之め、
フェライトヘッド等と組み合わせ比場合には、記録時の
温度が高くなるとオーバーライド特性が低下する。Is the perpendicular magnetization component of the medium using plate-shaped hexagonal ferrite powder? Although it has attracted attention because high recording density can be achieved by using it, the rate of change of coercive force with temperature is positive, that is, the coercive force increases as the temperature rises. This thing,
When used in combination with a ferrite head or the like, the override characteristics deteriorate as the temperature during recording increases.
本発明において、板状六方晶フェライト粉とは。In the present invention, what is plate-shaped hexagonal ferrite powder?
以下の一般式で示される［＆換型六方晶フェライト初で
ある。This is the first hexagonal ferrite represented by the following general formula.
ＡＯ・ｎ （Ｆｅ ＞ −（ｘ＋ｙ ） Ｍｙ、” Ｍ
Ｄ”） ２０ｓここでＡｒ１Ｂａ、Ｂｒ、 Ｐｂ、 Ｃ
ａから選ばｎるいずれか１１または二櫨以１を混合し之
ものでめジ。AO・n (Fe > −(x+y) My,” M
D”) 20s where Ar1Ba, Br, Pb, C
Mix any 11 of n selected from a or 1 of 2 or more.
Ｍ”ｉ工Ｍｎ、 Ｃｕ、 Ｃｏ、 Ｚｎ、 Ｎｉ、 Ｍ
ｆｉの２価イオンから選ばれるいずれか一５ｔまたは二
種以上と混合したものであり１Ｍ はＴｉ 、 Ｚｒ、
Ｓｎ、の４イ曲イオンから選ばれるいずれか一櫨１７
ｔは二種以上を混合し之ものである。M”i Engineering Mn, Cu, Co, Zn, Ni, M
It is a mixture of one or more selected from the divalent ions of fi, and 1M is Ti, Zr,
Any one selected from the 4 i-kune ions of Sn, 17
t is a mixture of two or more types.
ｎＶｉ従米媒体用磁性粉として最適な磁気時ａを示す之
め４から７のものが用いられているが、この場合にはい
ずｎも保磁力の温度変化率が正であるため、フェライト
ヘッド等と組み合わせた場合。As magnetic powders for nVi-based media, those with a magnetic time a of 4 to 7 are used, but in this case, since the temperature change rate of coercive force is positive for n, When combined with.
記録時の温度が高いとオーバーライド特性が悪い、ここ
でｎｋ８から１２の範囲の組成のフェライトとした場合
には、保磁力の温度変化率が−ｏ、２０ｅ／ｄｏ、９か
ら−２，ＬｌＯｅ／ｄｅ、！ｉ’となりフェライトヘッ
ド等のΔＢｇ／Δｔと同傾向となるため、記録時の温度
が副〈なってもオーバーライド特注は低下しない。If the temperature during recording is high, the override characteristic is poor.Here, when using ferrite with a composition in the range of nk8 to 12, the temperature change rate of coercive force is -o, 20e/do, 9 to -2, LlOe/ De,! i', which has the same tendency as ΔBg/Δt of ferrite heads, etc., so even if the temperature during recording becomes low, the override custom order does not decrease.
ｎとして１２より大きくし次組成としても保磁力の温度
変化率は負となるものの、保磁力の減少量が大きすぎる
之め、高温時の記録済；）−店号の田力レベルの低’Ｆ
ｆなわち７ＸＪ熱減磁が顕著上なるため好ましくない。Although the temperature change rate of coercive force becomes negative even if n is made larger than 12 and the next composition is used, the amount of decrease in coercive force is too large, so it has been recorded at high temperatures;
f, that is, 7XJ thermal demagnetization increases significantly, which is not preferable.
ｎが８より小さい場合には、保磁力の温度変化率が−０
ｅ／ｄｅｌより小さくなり１本発明の効果を発揮できな
い之め好ましくない。When n is smaller than 8, the temperature change rate of coercive force is -0
If it becomes smaller than e/del, the effect of the present invention cannot be exhibited, which is not preferable.
磁性粉の保磁力は、２００〜２，０ＵＯＯｅの範囲内に
あるもの′ｆ：１ｆ！用するのが好ましく、保磁力が２
０００ｓよりも小さいと高密度記録が良好に行えず、
２，００００ｅより大きいものは、磁気記録媒体用と
して適さない。The coercive force of the magnetic powder is within the range of 200 to 2,0 UOOe'f: 1f! It is preferable to use a coercive force of 2
If it is smaller than 000s, high-density recording cannot be performed well,
Anything larger than 2,0000e is not suitable for magnetic recording media.
磁性粉の粒径は、０．０２μｍ〜０．５μ鴨の範囲内で
あることが好ましい。０．０２μ喝より小さいものは十
分な磁性を示さず１反対に０．５μｍより大きいものを
丈用すると、磁性層の表面平滑性を十分に向とさせるこ
とができず、良好な高密度記録が行えない。The particle size of the magnetic powder is preferably within the range of 0.02 μm to 0.5 μm. If the length is smaller than 0.02 μm, it will not show sufficient magnetism, and on the other hand, if the length is larger than 0.5 μm, the surface smoothness of the magnetic layer will not be sufficiently improved, resulting in good high-density recording. I can't do it.
本発明に用いる置換型六方晶フェライト粉は。The substituted hexagonal ferrite powder used in the present invention is:
水熱法あるいはフラックス法など既知の方法により合成
することができる。It can be synthesized by known methods such as hydrothermal method or flux method.
このような磁性粉末ｔｒｔＣ用して、磁気記録媒体ｔ−
製造するには、常法に準じて装造する。たとえば、前記
の板状六方晶フェライト磁性粉末を、結合剤樹脂、有機
溶剤等とともに混合分収して磁性塗料を調製し、この塗
料をポリエステルフィルムなどの基体上にロールコータ
など任意の塗布手段によって塗布し乾燥すればよい。Using such magnetic powder trtC, magnetic recording medium t-
To manufacture, assemble according to conventional methods. For example, a magnetic paint is prepared by mixing and collecting the plate-shaped hexagonal ferrite magnetic powder with a binder resin, an organic solvent, etc., and this paint is applied onto a substrate such as a polyester film by any coating method such as a roll coater. Just apply it and let it dry.
なお、このような板状六方晶フェライト磁性粉を含む磁
性塗料は、基体上に塗布し次後、磁准ノー面に対して垂
直方向に磁場ｔ−印加して磁場配向を行うと、磁化容易
方向がより良好に車直方回に配向されるとともに、磁性
Ｉｎの表面平滑性も良好となるため、このような磁場配
向を行うのが好ましい。It should be noted that a magnetic paint containing such a plate-shaped hexagonal ferrite magnetic powder can be easily magnetized by applying a magnetic field t in the direction perpendicular to the magnetic no-plane after coating it on a substrate. It is preferable to carry out such magnetic field orientation because the direction is better oriented in the direction parallel to the car and the surface smoothness of the magnetic In is also improved.
ここに用いる結合剤樹脂としては、塩化ビニル−酢酸ビ
ニル系共重合体、ポリビニルブチラール樹脂、ｍ維素系
樹脂、ポリウレタン系樹脂、イソシアネート化合口、放
射線硬化ｍ樹脂など、従来汎用されている結合剤樹脂が
広く用いられる。The binder resin used here includes conventionally widely used binders such as vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, m-cell resin, polyurethane resin, isocyanate compound, and radiation-cured m-resin. Resins are widely used.
また、有ｉｓ剤としては、トルエン、メチルエチルケト
ン、メチルイソブチルケトン、シクロヘキサノン、ナト
２ヒドロフラン、酢酸エチルなど従来から汎用されてい
る）Ｋ機醪剤が単独ま九は二種以上混合して使用される
。In addition, as IS agents, K-machine mortar (which has been widely used in the past, such as toluene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, dihydrofuran, and ethyl acetate) can be used alone or in combination of two or more. .
なお、Ｓ性塗料中には通“虐使用されている各檀ｆＡ、
ｙ＋０剤、たとえば分藏剤、關滑剤、研磨剤、帯成防止
剤などを任意に添／Ｆ００ｉ２用してもよい。In addition, in the S-based paint, each of the commonly used DanfA,
A y+0 agent such as a thickening agent, a lubricant, an abrasive, an anti-banding agent, etc. may be optionally added/F00i2.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
実施例Ｉ
ＢａＣＪｇ ・２ｋｈＯｔ” ２１．３．ｌｉｌ 、
ＦｅＣｌ３・６ＨｚＯ。Example I BaCJg ・2khOt” 21.3.lil,
FeCl3・6HzO.
４３８．３．ｊｉｌ、 ＣｏＣ１ｘ ・６Ｈｚ０．１４
．５．９． ＴｉＣＪａ ・ｌ １．６、ｐ１！Ｉ：水
１ｌｖｃｐｅｌｋ−４Ｌ、、 コｎｙ２１規’；ｆ５
（１） ＮａＯＨ水ｍ液ｔｇと混合して沈澱吻を得た。438.3. jil, CoC1x ・6Hz0.14
．． 5.9. TiCJa・l 1.6, p1! I: Water 1lvcpelk-4L,, Cony21 regulation'; f5
(1) A precipitate was obtained by mixing with NaOH aqueous solution tg.
この沈澱物乞オートクレーブ中で３００″Ｃで２時間水
熱反ル６させ。The precipitate was hydrothermally boiled in an autoclave at 300''C for 2 hours.
得られた反応生成物を水洗、ｆｉ過、乾燥したのち。The obtained reaction product was washed with water, filtered through filtration, and dried.
空気中にて８５０℃で８時間加熱＠理を行い、六方晶バ
リウムフェライト粉を得た。Heating was performed in air at 850° C. for 8 hours to obtain hexagonal barium ferrite powder.
このフェライト粉は前記化学式中のｎ＝１Ｏ，！＝０．
０３５．ｙ＝ｏ、ｏａｓにて表はされる組成のものであ
り、保磁力＝７３００ｅ、飽和磁化量＝５４ｅｍｕ／Ｉ
、平均粒子径＝０．０７μ駕、平均板状比＝７であり九
。This ferrite powder has n=1O in the chemical formula above,! =0.
035. The composition is shown in the table as y=o, oas, coercive force=7300e, saturation magnetization=54emu/I
, average particle diameter = 0.07 μm, average plate ratio = 7, and 9.
こうして得られたフェライト磁性粉末を用いて。Using the ferrite magnetic powder thus obtained.
下記のようにして磁気ディスクを作製した。A magnetic disk was produced as follows.
バリウムフェライト磁性粉 １０００ｉＪｉ量部塩
ビー酢ビービニルアルコール共１合体（ＵＣＣ社製、Ｖ
ＡＧＨ） １３７．５重世部ポリウレ
タン樹脂（大日本インキ化学社製、バンデックスＴ５２
０１） ８７．５直置部α−ＡｈＯｓ
１００ｇＭｋ部メチルイソブチル
ケトン ８００１ｉｆｉ部トルエン
ＳＯＯ瓜濾部上記組成′Ｊ７！ＩＪをボ
ールミルにて３日間混合分収を行った後。Barium ferrite magnetic powder 1000 iJi parts Vinyl chloride, vinegar, vinyl alcohol (made by UCC, V
AGH) 137.5 polyurethane resin (manufactured by Dainippon Ink Chemical Co., Ltd., Bandex T52
01) 87.5 direct placement part α-AhOs
100g Mk part Methyl isobutyl ketone 8001ifi part Toluene
SOO melon filter part above composition 'J7! After IJ was mixed and collected in a ball mill for 3 days.
オレイルオレー） ８０改量部３官
能注インシアネート化合物（日本ポリウレタン社製、コ
ロネートＬ） ２５ｇｔ部を加え、さらに２
時間混合分威して、磁性塗料を調製した。この磁性塗料
を厚さ７５μ鴨のポリエステルフィルムの両面に皇布、
乾燥して磁゛注ｔｌａ’に形成した。ついで平滑化１２
０１埋を行った後、所定の径の円板状にｆＴち抜きフロ
ッピーディスクを作製した。平滑化処理後の磁性層の厚
さは３μ鴨であった。−２０℃から８０℃の温度範囲で
の保磁力の温き
変度化率（ΔＨｅ／Δｔ）は−〇、５ｈ／ｄｅＮであツ
九。Oleyl ole) 80 modified parts 3 functional injection incyanate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) 25 gt parts were added, and further 2 parts
A magnetic paint was prepared by mixing for a period of time. This magnetic paint was applied to both sides of a 75 μ thick duck polyester film.
It was dried and formed into a magnetic paste. Then smoothing 12
After performing 01 filling, fT punched floppy disks were prepared in the shape of discs with a predetermined diameter. The thickness of the magnetic layer after the smoothing treatment was 3 μm. The temperature change rate of coercive force (ΔHe/Δt) in the temperature range from -20°C to 80°C is -〇, 5 h/deN.
実施例２
実施例１のフェライト粉合成のさいのＦｅＣ１１ｓ・６
Ｍ １０の部用ｆｉ、４３８．３．ｉｉｒに変えて３
６８．６ｇ。Example 2 FeC11s.6 during ferrite powder synthesis of Example 1
M 10 part fi, 438.3. Change to iir 3
68.6g.
Ｃｏ（Ｊ２・ａＨｚＯＣＤ ｖ用７１４．！１ｔ−１４
，１＆に、ＴｉＣ６ａの使用量１１．６９を１１．３
／ｉに変え之こと以外は、実施例１と同様にしてフェラ
イト粉を得た。この扮は化学式中でのｎ＝８．５．ｘ＝
０．０４．ｙ＝０．０４の組成で表はされる。この粉の
保磁力＝７３００ｅ、飽和磁化ｉ＝５４ｅｍｕ／Ｌ平均
粒子？４＝０．０７ｐｍ、平均板状比＝７であった。Co(J2・aHzOCD v for 714.!1t-14
, 1&, TiC6a usage amount 11.69 to 11.3
Ferrite powder was obtained in the same manner as in Example 1 except that /i was changed. In this case, n=8.5 in the chemical formula. x=
0.04. The table is made with a composition of y=0.04. Coercive force of this powder = 7300e, saturation magnetization i = 54emu/L average particle? 4=0.07 pm, average plate ratio=7.
この粉を用いての７０ツピーデイスクの作成は。How to make a 70 tsupi disk using this powder.
実施例１のフロッピーディスクの作成法と同様にして行
なった。得られたフロッピーディスクのΔＨａ／Δｔ
ｒｉ−１，００ｅ ／ ｄｅｌ、でリッた。The floppy disk was manufactured in the same manner as in Example 1. ΔHa/Δt of the obtained floppy disk
It was ri-1,00e/del.
比較例１
実施例１のフェライト粉の合成でＦｅＣｊｔｓ・６Ｈ２
０の便用Ｊ１４３８．３＆に２２６．２ｇ１ＣＣｏＣｈ
・６ＨｚＯの開用７１４．ｓ、９’６２４．９ｇに、
Ｔｉ１Ｊ＋の開用ｔ ｌ １．６ｇを１９．９ ｇに変
え几こと以外は、′Ａ施例１と同様にしてフェライト粉
を合成した。Comparative Example 1 FeCjts・6H2 was synthesized from the ferrite powder of Example 1.
0 flight J1438.3 & 226.2g1CCoCh
・Opening of 6HzO 714. s, 9'624.9g,
Ferrite powder was synthesized in the same manner as in 'A Example 1, except that the opening time of Ti1J+ was changed from 1.6 g to 19.9 g.
得られた粉は化学式中でｎ＝６．ｚ＝Ｑ、ｌ、 ｙ＝０
．１の組成で表はされる。この粉の保磁力＝６８００ｅ
、ａ和磁化量＝ ５２ ｅｍｕ／ １１ 、平均粒子径
二〇、０７μ鴨、平均板状比＝７でろつ次、この紛を用
いて、実施例１のフロッピーディスク作成法と同様にし
て、フロッピーディスク全作成した。フロッピーディス
クのΔＨａ／Δｔは＋１．５０ｓ／ｄｏ／であつ之。The obtained powder has a chemical formula of n=6. z=Q, l, y=0
．． The composition is shown in Table 1. Coercive force of this powder = 6800e
, a sum magnetization amount = 52 emu/11, average particle size 20, 07 μm, average plate ratio = 7. Using this powder, a floppy disk was made in the same manner as in Example 1. I created all the discs. The ΔHa/Δt of the floppy disk is +1.50 s/do/.
比較例２
実施例１のフェライト粉の合成で、ＦｅＣＪｓ・６、Ｈ
ｚＯＣＤ ｖ用ｊｉ、 ４３８．３．！ｉ’ ｔ ５４
２．９ 、ｊｉｌ ＶＣＣｏＣ１２’６ＨｘＯｒＤ便用
ｔ ｌ ４．５ 、！ｉ”ｋ １０．０１１ ＩＣ，Ｔ
ｉＣＪａ Ｏｌｅ用ｔ ｌ １．６ 、ｐを７．９９に
変えたこと以外は実施例１と同様にしてフェライト粉を
合成した。Comparative Example 2 In the synthesis of ferrite powder of Example 1, FeCJs・6,H
ji for zOCD v, 438.3. ! i't 54
2.9, jil VCCoC12'6HxOrDbin t l 4.5,! i”k 10.011 IC,T
Ferrite powder was synthesized in the same manner as in Example 1 except that t l 1.6 and p for iCJa Ole were changed to 7.99.
得られた粉は、化学式中でｎ＝１２、ｘ＝０．０２゜ｙ
＝０．０２の組成で表はされる。この紛の保磁力＝７５
００ｓ、ａｄ和磁化ｉ＝５５ｅｍｕ／ｇ、平均粒子径＝
０．０７μｍ、平均板状比＝７であった。The obtained powder has the following chemical formula: n=12, x=0.02゜y
Tables are shown with a composition of =0.02. Coercive force of this powder = 75
00s, ad sum magnetization i=55emu/g, average particle size=
It was 0.07 μm, and the average plate ratio was 7.
この粉を用いて実施例１のフロッピーディスク作成法と
同様にして、フロッピーディスクを作成し九〇フロッピ
ーディスクのΔＨａ／Δｔ ｒｉ−３，００ｅ／ｄｅｇ
であった。Using this powder, a floppy disk was made in the same manner as in Example 1, and ΔHa/Δtri-3,00e/deg of 90 floppy disk was obtained.
Met.
上記各実施例、比較例で得られたフロッピーディスクに
つき、磁気特注、３よび各記録密度における電磁変換特
注を測定した。For the floppy disks obtained in the above Examples and Comparative Examples, magnetic customization, 3, and electromagnetic conversion customization at each recording density were measured.
オーバーライド特性は１ｐｔｅｒ＊と書き込み１次に２
Ｆ信号を直ね沓きし、ＩＦ傷信号消え残りと２Ｆ信号の
比で求めるが、２Ｆ信号１に重Ｑ１１きする場合のシス
テムの温度を２０℃と６０℃の２つの温度に保持して測
定し之。開用した磁気ヘッドは２０℃におけるＢ８が５
００１）Ｇのフェライトヘッドであった。Override characteristics are 1pter* and write 1st and 2nd
The F signal is measured directly and determined by the ratio of the remaining IF scratch signal and the 2F signal, but when applying heavy Q11 to the 2F signal 1, the system temperature is maintained at two temperatures, 20℃ and 60℃. Measure it. The released magnetic head has B8 of 5 at 20°C.
001) G ferrite head.
粉を用いて、デジタル記録方式の磁気媒体を炸裂すると
１丈用時の温度が変化してもオーバーライド特性が非″
盾に優れ、しかも加熱減磁の少ない磁気記録媒体が得ら
れることが明らかである。When a digital recording type magnetic medium is exploded using powder, the override characteristic does not change even if the temperature changes during one-length use.
It is clear that a magnetic recording medium with excellent shielding properties and less thermal demagnetization can be obtained.
出願人 日立マクセル株式会社
代表者 水 井 厚
〔発明の効果〕
以上説明し比ように、板状六方晶フェライト粉を磁性粒
子として用いた磁気記録媒体において。Applicant Hitachi Maxell Co., Ltd. Representative Atsushi Mizui [Effects of the Invention] As explained above, in a magnetic recording medium using plate-shaped hexagonal ferrite powder as magnetic particles.
Claims (2)
粒子として含む磁性層を設けてなる磁気記録媒体におい
て、−２０℃から８０℃の温度範囲における保磁力の温
度変化率が−０．２Ｏｅ／ｄｅｇから−２Ｏｅ／ｄｅｇ
の範囲にあることを特徴とする磁気記録媒体。(1) In a magnetic recording medium in which a magnetic layer containing plate-shaped hexagonal ferrite powder as magnetic particles is provided on a nonmagnetic support, the temperature change rate of coercive force in the temperature range of -20°C to 80°C is -0. .2Oe/deg to -2Oe/deg
A magnetic recording medium characterized by being in the range of .
において、ｎの値が４から１２である磁性粒子を用いた
ことを特徴とする請求項（１）記載の磁気記録媒体。 ＡＯ・ｎ（Ｆｅ＿１＿−＿（＿ｘ＿＋＿ｙ＿）Ｍ＾２＾
＋＿ｘＭ＾４＾＋＿ｙ）＿２Ｏ＿３Ａ：Ｂａ、Ｂｒ、Ｐ
ｂ、Ｃａから選ばれる一種または二種以上の混合物 Ｍ＾２＾＋：Ｍｎ、Ｃｕ、Ｃｏ、Ｚｎ、Ｎｉ、Ｍｇの２
価イオンから選ばれる一種または二種以上の混合物 Ｍ＾４＾＋：Ｔｉ、Ｚｒ、Ｓｎの４価イオンから選ばれ
る一種または二種以上の混合物(2) The magnetic recording medium according to claim (1), characterized in that in plate-shaped hexagonal ferrite powder represented by the following general formula, magnetic particles having a value of n from 4 to 12 are used. AO・n(Fe_1_-_(_x_+_y_) M^2^
+_xM^4^+_y)_2O_3A:Ba, Br, P
b, a mixture of one or more selected from Ca M^2^+: Mn, Cu, Co, Zn, Ni, Mg;
A mixture of one or more valence ions selected from valence ions M^4^+: A mixture of one or more valence ions selected from tetravalent ions of Ti, Zr, and Sn
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24050788A JPH0289218A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24050788A JPH0289218A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0289218A true JPH0289218A (en) | 1990-03-29 |
Family
ID=17060546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24050788A Pending JPH0289218A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0289218A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59151339A (en) * | 1983-02-16 | 1984-08-29 | Fuji Photo Film Co Ltd | Ferrite magnetic body for magnetic recording and its manufacture |
| JPS63146216A (en) * | 1986-12-09 | 1988-06-18 | Tdk Corp | Magnetic recording medium |
| JPS63171418A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1988
- 1988-09-26 JP JP24050788A patent/JPH0289218A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59151339A (en) * | 1983-02-16 | 1984-08-29 | Fuji Photo Film Co Ltd | Ferrite magnetic body for magnetic recording and its manufacture |
| JPS63146216A (en) * | 1986-12-09 | 1988-06-18 | Tdk Corp | Magnetic recording medium |
| JPS63171418A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Maxell Ltd | Magnetic recording medium |
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