JPH02306602A - Magnetic powder and magnetic recording medium using same magnetic powder - Google Patents
Magnetic powder and magnetic recording medium using same magnetic powderInfo
- Publication number
- JPH02306602A JPH02306602A JP1128439A JP12843989A JPH02306602A JP H02306602 A JPH02306602 A JP H02306602A JP 1128439 A JP1128439 A JP 1128439A JP 12843989 A JP12843989 A JP 12843989A JP H02306602 A JPH02306602 A JP H02306602A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- powder
- recording medium
- elements
- 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
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 38
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910020517 Co—Ti Inorganic materials 0.000 claims abstract description 3
- 229910052738 indium Inorganic materials 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract 3
- 229910020641 Co Zr Inorganic materials 0.000 claims abstract 2
- 229910020520 Co—Zr Inorganic materials 0.000 claims abstract 2
- 229910007857 Li-Al Inorganic materials 0.000 claims abstract 2
- 229910007975 Li-Ga Inorganic materials 0.000 claims abstract 2
- 229910008447 Li—Al Inorganic materials 0.000 claims abstract 2
- 229910006620 Li—Ga Inorganic materials 0.000 claims abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 2
- 229910052788 barium Inorganic materials 0.000 claims abstract 2
- 229910052796 boron Inorganic materials 0.000 claims abstract 2
- 229910052802 copper Inorganic materials 0.000 claims abstract 2
- 229910052733 gallium Inorganic materials 0.000 claims abstract 2
- 229910052745 lead Inorganic materials 0.000 claims abstract 2
- 229910052748 manganese Inorganic materials 0.000 claims abstract 2
- 229910052759 nickel Inorganic materials 0.000 claims abstract 2
- 229910052712 strontium Inorganic materials 0.000 claims abstract 2
- 229910052725 zinc Inorganic materials 0.000 claims abstract 2
- 229910052726 zirconium Inorganic materials 0.000 claims abstract 2
- 239000000843 powder Substances 0.000 claims description 19
- 230000005415 magnetization Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims 1
- 229910007960 Li-Fe Inorganic materials 0.000 abstract description 2
- 229910006564 Li—Fe Inorganic materials 0.000 abstract description 2
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 229910001000 nickel titanium Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 108091006629 SLC13A2 Proteins 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 description 1
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 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
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/08—Compounds containing boron and nitrogen, phosphorus, oxygen, sulfur, selenium or tellurium
- C01B35/10—Compounds containing boron and oxygen
- C01B35/12—Borates
- C01B35/128—Borates containing plural metal or metal and ammonium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Iron (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁性粉に係わシ、さらに詳しくは、磁気記録媒
体用として有用な新規の磁性粉と該磁性粉を用いた磁気
記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic powder, and more particularly to a novel magnetic powder useful for magnetic recording media and a magnetic recording medium using the magnetic powder. .
近年、情報量の増大により記録媒体の高記録密度化が要
求されている。しかし、従来の磁性面に平行な方向に磁
化記録する面内磁気記録方式では高密度化に限界がある
。In recent years, as the amount of information has increased, there has been a demand for higher recording densities in recording media. However, with the conventional longitudinal magnetic recording method in which magnetization is recorded in a direction parallel to the magnetic surface, there is a limit to increasing the density.
そこで磁化記録の方向が磁性面に垂直な垂直磁気記一方
式が、高密度が可能な記録方式として注目され、盛んに
研究開発が進められている。垂直磁気記録方式を利用し
た磁気記録媒体に種々なものがあるが、六方晶形フェラ
イト、例えばＨａ （ＣｏＴｉ ）ｘＦｅｌｌ−ｘ０１
＠で示される磁性体を磁性粉として含む塗布型磁気記録
媒体が現在量も有望視されている。Therefore, perpendicular magnetic recording, in which the direction of magnetization recording is perpendicular to the magnetic surface, has attracted attention as a recording method capable of achieving high density, and research and development are actively underway. There are various types of magnetic recording media that use the perpendicular magnetic recording method, but hexagonal ferrite, such as Ha (CoTi)xFell-x01,
Coating-type magnetic recording media containing a magnetic material represented by @ as magnetic powder are currently available and are viewed as promising.
しかし、上記ＢＬフェライト磁性粉は、飽和磁化が高々
６００ｍｕ／ｆｌ程度と低いため、高密度記録は可能で
ありながら、最大再生出力が低い磁気記録媒体しか得ら
れないという問題があった。However, since the BL ferrite magnetic powder has a low saturation magnetization of about 600 mu/fl at most, there is a problem in that although high-density recording is possible, only a magnetic recording medium with a low maximum reproduction output can be obtained.
本発明は塗布型磁気記録媒体の再生出力が低いという欠
点を解決し、以って高記録密度でしかも再生出力が高い
磁気記録媒体用磁性粉および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 problem of low reproduction output of coated magnetic recording media, and to provide magnetic powder for magnetic recording media and magnetic recording media that have high recording density and high reproduction output.
本発明者らは、上記目的を達成するため鋭意検討した結
果、一般式
％式％）
で表わされる大方晶フェライト磁性粉で、ＲはＢａ％
Ｓｒ％ｐｂおよびＣａから選ばれた少なくとも１種の元
素、Ｍ２＋はＺｎ ％Ｍｎ ｓ Ｃｕ ％Ｆｅ、Ｎ１、
Ｍｇなどの２価の元素あるいは、Ｌｉ−Ｆｅ。As a result of intensive studies to achieve the above object, the inventors of the present invention found that a macrogonal ferrite magnetic powder represented by the general formula (%), where R is Ba%
At least one element selected from Sr%pb and Ca, M2+ is Zn%MnsCu%Fe, N1,
Divalent elements such as Mg or Li-Fe.
Ｌｉ−ＡＪ％ Ｉ、１−Ｇａなどの１価の元素と３価の
元素の組合せから選ばれた少なくとも１組の組合せ、Ｍ
３＋はＢ％ Ｌａ ｓ ＡＪ １Ｇａ ％Ｉｎなどの３
価の元素あるいはＣｏ−Ｔｉ、Ｚｎ−Ｔｉ％Ｎ１− Ｔ
ｌ 、Ｃｏ −Ｚｒ ｓ Ｚｎ −Ｚｒ 、 Ｎ１−
Ｚｒなどの２価の元素と４価の元素の組合せから選ばれ
た少なくとも１組の組合せで、ｌは０．５〜２．０、ｍ
は０．０１〜０，５、ｎは７．５〜９でかつｎ＋ｍ＝８
〜９の関係を満たす値で示される六方晶フェライト磁性
粉が非常に高い飽和磁化を有することを見出し、本発明
をなすに至った。Li-AJ% I, at least one combination selected from combinations of monovalent elements and trivalent elements such as 1-Ga, M
3+ is B%La s AJ 1Ga %In etc.
Valence elements or Co-Ti, Zn-Ti%N1-T
l , Co -Zr s Zn -Zr , N1-
At least one combination selected from combinations of divalent elements such as Zr and tetravalent elements, l is 0.5 to 2.0, m
is 0.01 to 0.5, n is 7.5 to 9, and n+m=8
It has been discovered that hexagonal ferrite magnetic powder having a value satisfying the relationship of ~9 has extremely high saturation magnetization, and the present invention has been completed.
一般式で１＝２、ｍ＝ｏ、ｎ＝８の組成の六方晶７エラ
イトは、一般にＷ型フェライト磁性体と呼ばれているも
のである。この磁性粉は従来のＢａフェライト粉に比し
著しく高い飽和磁化を有し、かつ板状粒子で、その板面
に対し垂直方向に磁化容易軸を有する。Hexagonal heptagonal 7-elite having a general formula of 1=2, m=o, and n=8 is generally called a W-type ferrite magnetic material. This magnetic powder has a significantly higher saturation magnetization than conventional Ba ferrite powder, and is a plate-shaped particle with an axis of easy magnetization perpendicular to the plate surface.
本発明での大方晶フェライト粉は上記ＷＷｉフェライト
粉よ〕飽和磁化を格段に向上させた新規な磁性粉である
。The orthogonal ferrite powder used in the present invention is a novel magnetic powder that has significantly improved saturation magnetization compared to the above-mentioned WWi ferrite powder.
ｌが０．５より小さくなるか、１．９よ）も大きくなっ
たｂ、ｍが０．０１よ〕小か、０．５を超えた場合には
飽和磁化が小さくなる。またｎおよびｎ十ｍが８よシも
小さくなるか９よ〕も大きくなると、結晶形が変形しゃ
すくな〕、シかも磁気特性が低下する。When l becomes smaller than 0.5 or 1.9) becomes larger, the saturation magnetization becomes smaller when b and m become smaller than 0.01 or exceed 0.5. Furthermore, if n and n0m become smaller than 8 or larger than 9, the crystal shape becomes less deformable and the magnetic properties deteriorate.
磁気記録媒体用磁性粉としては、保磁力が２００〜２０
００エルステツドの範囲にあるのが望ましい。２００エ
ルステツド以下では高密度記録特性が不十分となｆｉ、
２０００工ルステツド以上となると磁気記録媒体用とし
ては不適となる。Magnetic powder for magnetic recording media has a coercive force of 200 to 20
Preferably, it is in the range of 0.00 oersted. If it is less than 200 oersted, the high density recording characteristics will be insufficient.
If it exceeds 2000 processes, it is not suitable for use in magnetic recording media.
磁性粉の平均粒径は０．０１〜０．３μｍが適当である
。この値が０．０１μｍ以下となると強磁性を呈しなく
な〕、一方０．３μｍ以上となると高密度記録が良好に
行えなくなる。The average particle diameter of the magnetic powder is suitably 0.01 to 0.3 μm. When this value is 0.01 μm or less, ferromagnetism is no longer exhibited], while when it is 0.3 μm or more, high-density recording cannot be performed satisfactorily.
本発明による大方晶フェライト磁性粉は下記方法によシ
合成する。すなわち目的とする六方晶フェライトを構成
する金属イオンを含む塩、例えば塩化物、硝酸塩などの
水溶性化合物の水溶液と、アルカリ溶液とを混合して沈
澱物を生成させ、これをオートクレーブ中で１５０〜３
００℃で１〜６時間水熱反応させたのち反応生成物を水
洗、濾過、乾燥する。これをＮａＣ１などのフラックス
と混合して１０００〜１４００℃の温度で熱処理後、温
水あるいは酸性溶液などでフラックスを除去すると、微
粒子で粒径が均一な六方晶フェライト粉が得られる。The orthogonal ferrite magnetic powder according to the present invention is synthesized by the following method. That is, an aqueous solution of a water-soluble compound such as a salt containing metal ions constituting the desired hexagonal ferrite, such as a chloride or a nitrate, is mixed with an alkaline solution to form a precipitate, and the precipitate is heated in an autoclave to 3
After a hydrothermal reaction at 00° C. for 1 to 6 hours, the reaction product is washed with water, filtered, and dried. When this is mixed with a flux such as NaCl, heat treated at a temperature of 1000 to 1400°C, and the flux is removed with warm water or an acidic solution, fine hexagonal ferrite powder with a uniform particle size can be obtained.
本発明の磁気記録媒体は磁性粉として上記六方晶フェラ
イト粉を使用し、バインダとしては従来よシ汎用の樹脂
を用い、これにこれまた常用されている各種添加剤を加
え有機溶剤に添加混合し磁性塗料を調製し、この塗料を
ポリエステルフィルムなどの非磁性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乾燥して磁性層を形
成して炸裂する。The magnetic recording medium of the present invention uses the above-mentioned hexagonal ferrite powder as the magnetic powder, uses a conventional general-purpose resin as the binder, and adds various commonly used additives to this and mixes it with an organic solvent. A magnetic paint is prepared, and this paint is coated onto a non-magnetic substrate such as a polyester film using any coating means such as a roll coater, dried to form a magnetic layer, and then exploded.
以下に本発明を実施例により詳説する。 The present invention will be explained in detail below using examples.
実施例！
ＢａＣｌ１２８２ ＨｚＯ２，４４１１−ＺｎＣＪｚ
２，０４ ｆ −Ｈ３ＢＯ３０，１２ｆ、ＦｅＣ４−
６Ｈ，０４４，３３ｆを含む水溶液２００５ｇｔ−Ｎａ
ＯＨ５０，ＯｆおよびＮａ、Ｃ０，１２，５ｆを含むア
ルカリ水溶液４００ｄ中に添加して共沈物を得、これを
オートクレーブ中で２００℃％２時間水熱反応させ、得
られた生成物を水洗、濾過、乾燥後、生成物と同量のＮ
ａＣＪｉ！を混合し、空気中で１３００°Ｃで２時間加
熱後室温まで急冷した。この混合物を約６０°Ｃの温水
で水洗し、ＮａＣ１’ｆｒ：除去して六方晶フェライト
粉を８Δ
得た。この粉末は前記一般式におけるＲ ＝ 届り。Example! BaCl1282 HzO2,4411-ZnCJz
2,04 f -H3BO30,12f, FeC4-
2005gt-Na aqueous solution containing 6H,044,33f
A coprecipitate was obtained by adding it to 400 d of an alkaline aqueous solution containing OH50,Of and Na, CO,12,5f, which was subjected to a hydrothermal reaction at 200°C% for 2 hours in an autoclave, and the resulting product was washed with water. After filtration and drying, the same amount of N as the product
aCJi! were mixed, heated in air at 1300°C for 2 hours, and then rapidly cooled to room temperature. This mixture was washed with warm water at about 60°C to remove NaC1'fr, yielding 8Δ hexagonal ferrite powder. This powder has R = delivery in the above general formula.
Ｍ”＝ Ｚｎ ％Ｍ”＝＋Ｂ、ｌ＝ １．５、ｍ＝０．
１およびｎ＝８．２の化合物で保磁力５３０エルステツ
ド、飽和磁化７８ｅｍｕ／ｆｓ平均粒径０，０７μ７７
！であった０
上記合成法にもとづき得られ丸穴方晶フェライト粉を用
い、下記のようにして磁気ディスクを作製した。M”=Zn %M”=+B, l=1.5, m=0.
1 and n=8.2, coercive force 530 oersted, saturation magnetization 78 emu/fs, average particle size 0.07 μ77
! 0 Using the round-hole cubic ferrite powder obtained based on the above synthesis method, a magnetic disk was produced in the following manner.
六方晶フェライト粉 １０００重量部塩ヒーａ
ｔｔビービニルアルコール
共重合体（ＵＣＣ社製ＶＡＧＨ） １３７．５／／ポ
リウレタン樹脂（大日本イン
キ社製パンテフクスＴ ５２０１ ） ８７，５
／／α−ＡＪ、０３１００ ／／
メチルイソブチルケトン ８００ 〃トルエン
８００ 〃上記組成物をボールミ
ルにて３日間混合分散した後、オレイルオレート８０重
量部、３官能性インシアネ一ト化合物（日本ポリウレタ
ン社製コロネー）Ｌ）２５重量部を加え、さらに２時間
混合分散して磁性塗料を調製した。この塗料を厚さ７５
μｍのポリエステルフィルムの両面に塗布、乾燥して磁
性層を形成した。ついで平滑処理を行った後、所定の径
の円板状に打ち抜きフロッピーディスクを作製した。平
滑処理後の磁性層の厚さは３．０μｍであった。Hexagonal ferrite powder 1000 parts by weight Salt Heat a
ttVinyl alcohol copolymer (VAGH manufactured by UCC) 137.5//Polyurethane resin (Pantefux T 5201 manufactured by Dainippon Ink) 87.5
//α-AJ, 03100 // Methyl isobutyl ketone 800 Toluene
800 After mixing and dispersing the above composition in a ball mill for 3 days, 80 parts by weight of oleyl oleate and 25 parts by weight of a trifunctional incyaneto compound (Coronet L manufactured by Nippon Polyurethane Co., Ltd.) were added, and the mixture was further mixed and dispersed for 2 hours. A magnetic paint was prepared. Apply this paint to a thickness of 75
It was coated on both sides of a μm polyester film and dried to form a magnetic layer. After smoothing, a disk-shaped floppy disk with a predetermined diameter was punched out. The thickness of the magnetic layer after the smoothing treatment was 3.0 μm.
実施例２〜５
実施例１の大方晶フェライト粉の合成法において、Ｚｎ
Ｃ＃２、Ｈ，ＢＯ，およびＦｅ（Ｊｓ −６Ｈ，Ｏの仕
込量を一般式でのｌ、ｍ、ｎの値が表１に示す値となる
ように変えた以外は、実施例１と同様にして六方晶フェ
ライト粉を合成した。得られた磁性粉の平均粒径は何れ
も約０．０７μｍであった。Examples 2 to 5 In the method for synthesizing macrogonal ferrite powder in Example 1, Zn
Example 1 except that the amounts of C#2, H, BO, and Fe (Js -6H, O) were changed so that the values of l, m, and n in the general formula became the values shown in Table 1. Hexagonal ferrite powder was synthesized in the same manner.The average particle size of the obtained magnetic powder was approximately 0.07 μm.
これ等の磁性粉を用いて、実施例１に記したと同様の方
法でフロッピーディスクを作製した。Using these magnetic powders, a floppy disk was produced in the same manner as described in Example 1.
実施例６
実施例１の六方晶フェライト粉の合成法において、Ｂａ
ＣＡ’２・２ Ｈ２Ｏに代えて５ｒＣ１＊Ｈ６ＨｘＯ２
，６６ｆｔ−用いた以外は実施例１と同様にして大方晶
フェライト粉を合成した。得られた粉末の平均粒径は０
．０７μｍであった。Example 6 In the method for synthesizing hexagonal ferrite powder of Example 1, Ba
CA'2・2 5rC1*H6HxO2 instead of H2O
, 66 ft- was used, but in the same manner as in Example 1, an orthogonal ferrite powder was synthesized. The average particle size of the obtained powder is 0
．． It was 07 μm.
この磁性粉を用いて実施例１と同様の方法でフロッピー
ディスクを作製した。A floppy disk was produced using this magnetic powder in the same manner as in Example 1.
比較例１〜２
実施例１の六方晶フェライト粉の合成法において、Ｚｎ
Ｃ１５，Ｈ，ＢＯ，およびＦｅＣＪ？、 ’ ６ Ｈ，
Ｏの仕込量を一般式における１％ｍ、ｎの値が表１に示
した値となるように変えた以外は実施例１と同様にして
六方晶フェライト粉を合成した。得られた磁性粉の平均
粒径は約０．０７μｍ゛であった。Comparative Examples 1 to 2 In the method for synthesizing hexagonal ferrite powder of Example 1, Zn
C15, H, BO, and FeCJ? , ' 6 H,
Hexagonal ferrite powder was synthesized in the same manner as in Example 1, except that the amount of O charged was changed so that the values of 1% m and n in the general formula became the values shown in Table 1. The average particle size of the obtained magnetic powder was about 0.07 μm.
これ等の磁性粉末を用いて実施例１と同様の方法でフロ
ッピーディスクを作製した。A floppy disk was produced in the same manner as in Example 1 using these magnetic powders.
表１
比較例３
ＢａＣ４ｊ ２ ＨｚＯ２，４４ｇ、ｙｅｃ１３−６
Ｈ，０３７，９ｆ ％ＣｏＣ１ｚ・６ ＨｘＯＯ，２４
ｊＦ、およびＴｌＣ１４０，１９ｆを含む水溶液２ Ｑ
Ｏｙｓｌと、Ｎａ０Ｈｓｏ、ｏｇ、Ｎａ、Ｃｏ３１２
．５ ｆ含むアルカリ水溶液４００Ｍ１ｔ−混合し、生
成した沈澱物をオートクレーブ中で３００°Ｃ，２時間
水熱反応させ、得られた反応生成物を水洗、濾過、乾燥
し、さらに空気中で５００℃、４時間加熱処理し、Ｃｏ
−Ｔｉ置換ｉ１Ｂｍフェライト磁性粉を得た。得られ
た磁性粉はＷ盟フェライト粉に属しないものであった。Table 1 Comparative Example 3 BaC4j 2 HzO2, 44g, yec13-6
H,037,9f %CoC1z・6 HxOO,24
Aqueous solution 2 containing jF and TlC140,19f Q
Oysl, Na0Hso, og, Na, Co312
．． 400 M of an aqueous alkali solution containing 5 f is mixed, the resulting precipitate is subjected to a hydrothermal reaction at 300°C for 2 hours in an autoclave, the resulting reaction product is washed with water, filtered, dried, and further heated at 500°C in air. After heat treatment for 4 hours, Co
-Ti-substituted i1Bm ferrite magnetic powder was obtained. The obtained magnetic powder did not belong to the W league ferrite powder.
磁性粉の平均粒径は０．０６μｍであった。The average particle size of the magnetic powder was 0.06 μm.
この磁性粉を用いて実施例１と同様の方法によってフロ
ッピーディスクを作製した。A floppy disk was produced using this magnetic powder in the same manner as in Example 1.
上記各実施例、比較例で得られた磁性粉およびフロッピ
ーディスクの磁気特性、電磁変換特性を調べ、その結果
を表２に示す。The magnetic properties and electromagnetic conversion properties of the magnetic powders and floppy disks obtained in each of the above Examples and Comparative Examples were investigated, and the results are shown in Table 2.
フロッピーディスクの磁気特性は、磁気記録媒体の面に
垂直な方向の特性で示した。また電磁変換特性の好個は
、ギャップ長 ０．４μ’、）ラック幅 ７０μｍのフ
ェライト磁気ヘッドを用い、磁気ヘッドと媒体との相対
速度は３ｍ／ｍで測定し九〇
〔発明の効果〕
以上説明したように、大方晶フェライト磁性粉として、
一般式
％式％）
で表わされるＷ鳳フェライト磁性粉に属し、４、ｍ、ｎ
を所定の範囲の値に限定した大方晶７エライト粉は、飽
和磁化が著しく高く、かつ、この磁性粉を用いた磁気記
録媒体の最大磁束密度（Ｂｍ）が非常に大きくなシ、高
密度記録が可能でしかも再生出力が大幅に改善された磁
気記録媒体が得られることは明らかである。The magnetic properties of a floppy disk are shown in the direction perpendicular to the surface of the magnetic recording medium. Further, good electromagnetic conversion characteristics were obtained by using a ferrite magnetic head with a gap length of 0.4 μ' and a rack width of 70 μm, and measuring the relative speed between the magnetic head and the medium at 3 m/m. As explained, as an orthogonal ferrite magnetic powder,
It belongs to the W ferrite magnetic powder represented by the general formula % formula %), 4, m, n
The macrogonal 7-elite powder, in which It is clear that a magnetic recording medium can be obtained which is capable of reproducing data and has significantly improved reproduction output.
Claims (3)
）・ｎ（Ｆｅ＿２Ｏ＿３）で表わされる六方晶フェライ
ト磁性粉で、ＲはＢａ、Ｓｒ、Ｐｂ、Ｃｄの中から選ば
れた少なくとも１種の元素、Ｍ＾２＾＋はＺｎ、Ｃｕ、
Ｍｎ、Ｆｅ、Ｎｉ、Ｍｇなどの２価の元素あるいは、Ｌ
ｉ−Ｆｅ、Ｌｉ−Ａｌ、Ｌｉ−Ｇａなどの１価の元素と
３価の元素の組み合せの中から選ばれた少なくとも１組
の組合せ、ｍ＾３＾＋はＢ、Ｌａ、Ａｌ、Ｇａ、Ｉｎな
どの３価の元素あるいは、Ｃｏ−Ｔｉ、Ｚｎ−Ｔｉ、Ｎ
ｉ−Ｔｉ、Ｃｏ−Ｚｒ、Ｚｎ−Ｚｒ、Ｎｉ−Ｚｒなどの
２価の元素と４価の元素の組合せの中から選ばれた少な
くとも１組の組合せ、またｌは０．５〜２．０）ｍは０
．０１〜０．５、ｎは７．５〜９でかつｎ＋ｍ＝８〜９
関係を満たす値で示されることを特徴とする六方晶フェ
ライト磁性粉。(1) General formula RO・l(M_2^3^+O)・m(M_2^30_3
)・n(Fe_2O_3) is a hexagonal ferrite magnetic powder, where R is at least one element selected from Ba, Sr, Pb, and Cd, and M^2^+ is Zn, Cu,
Divalent elements such as Mn, Fe, Ni, Mg, or L
At least one combination selected from combinations of monovalent elements and trivalent elements such as i-Fe, Li-Al, Li-Ga, m^3^+ is B, La, Al, Ga, Trivalent elements such as In or Co-Ti, Zn-Ti, N
At least one combination selected from combinations of divalent elements and tetravalent elements such as i-Ti, Co-Zr, Zn-Zr, and Ni-Zr, or l is 0.5 to 2.0 )m is 0
．． 01-0.5, n is 7.5-9 and n+m=8-9
A hexagonal ferrite magnetic powder characterized by being represented by a value that satisfies a relationship.
００エルステッド、飽和磁化が６０ｅｍｕ／ｇ以上、平
均粒径が０．０１〜０．３μｍであることを特徴とする
請求項（１）記載の六方晶フェライト磁性粉。(2) Coercive force of hexagonal ferrite magnetic powder is 200 to 20
The hexagonal ferrite magnetic powder according to claim 1, characterized in that the powder has a saturation magnetization of 0.00 oersted, a saturation magnetization of 60 emu/g or more, and an average particle size of 0.01 to 0.3 μm.
性層を設けた磁気記録媒体において該磁性粉として請求
項（１）および請求項（２）記載の磁性粉を用いたこと
を特徴とする磁気記録媒体。(3) Use of the magnetic powder described in claims (1) and (2) as the magnetic powder in a magnetic recording medium in which a magnetic layer containing mainly magnetic powder and a binder is provided on a non-magnetic support. Features of magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128439A JPH02306602A (en) | 1989-05-22 | 1989-05-22 | Magnetic powder and magnetic recording medium using same magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128439A JPH02306602A (en) | 1989-05-22 | 1989-05-22 | Magnetic powder and magnetic recording medium using same magnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02306602A true JPH02306602A (en) | 1990-12-20 |
Family
ID=14984763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1128439A Pending JPH02306602A (en) | 1989-05-22 | 1989-05-22 | Magnetic powder and magnetic recording medium using same magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02306602A (en) |
-
1989
- 1989-05-22 JP JP1128439A patent/JPH02306602A/en active Pending
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