JPH0992518A - Low curie point magnetic recording powder with high coercive force - Google Patents
Low curie point magnetic recording powder with high coercive forceInfo
- Publication number
- JPH0992518A JPH0992518A JP7272016A JP27201695A JPH0992518A JP H0992518 A JPH0992518 A JP H0992518A JP 7272016 A JP7272016 A JP 7272016A JP 27201695 A JP27201695 A JP 27201695A JP H0992518 A JPH0992518 A JP H0992518A
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- JP
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- Prior art keywords
- oxide
- powder
- magnetic recording
- curie point
- coercive force
- 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.)
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- Compounds Of Iron (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、磁気カード、磁
気テープ、磁気ディスク等の磁気記録層形成に使用する
のに適した、高い保磁力を有する低キュリー点磁気記録
粉末に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low Curie point magnetic recording powder having a high coercive force, which is suitable for use in forming a magnetic recording layer such as a magnetic card, a magnetic tape and a magnetic disk.
【０００２】[0002]
【従来の技術】従来、原子％で、酸化ストロンチウム
（ＳｒＯ）および酸化バリウム（ＢａＯ）のうちの１種
または２種：１４〜２０％、酸化クロム（Ｃｒ
2 Ｏ3 ）：２０〜４０％、酸化亜鉛（ＺｎＯ）および酸
化マグネシウム（ＭｇＯ）のうちの１種または２種：２
〜１５％、酸化錫（ＳｎＯ2 ）：２〜１５％を含有し、
残りが酸化鉄（Ｆｅ2 Ｏ3 ）および不可避不純物からな
る組成を有し、六方晶フェライト型結晶構造を有する複
合酸化物粉末は、飽和磁化：１５emu ／ｇ以上、キュリ
ー点：１５５℃以下、保磁力：１０ＫＯｅ以下の磁気特
性を有し、磁気記録粉末として使用されることは知られ
ている（特開平７−１３５１０５号公報参照）。2. Description of the Related Art Conventionally, one or two of strontium oxide (SrO) and barium oxide (BaO) in atomic%: 14 to 20%, chromium oxide (Cr
2 O 3 ): 20 to 40%, one or two of zinc oxide (ZnO) and magnesium oxide (MgO): 2
˜15%, tin oxide (SnO 2 ): 2 to 15%,
The composite oxide powder having the composition of the balance of iron oxide (Fe 2 O 3 ) and inevitable impurities and having the hexagonal ferrite type crystal structure has a saturation magnetization of 15 emu / g or more, a Curie point of 155 ° C. or less, and a storage temperature of 15 emu / g or more. Magnetic force: It has a magnetic characteristic of 10 KOe or less and is known to be used as a magnetic recording powder (see Japanese Patent Laid-Open No. 7-135105).
【０００３】[0003]
【発明が解決しようとする課題】近年の電子機器の小型
化および用途の多様化に伴い、磁気カード、磁気テー
プ、磁気ディスク等は磁気ノイズを受ける環境下でシー
ルドされることなく使用されることが多く、磁気ノイズ
による記録消失事故が多発している。With the recent miniaturization of electronic equipment and diversification of applications, magnetic cards, magnetic tapes, magnetic disks, etc. must be used without being shielded in an environment where magnetic noise is received. There are many record loss accidents due to magnetic noise.
【０００４】そのため、従来よりも一層高保磁力を有す
る低キュリー点磁気記録粉末が求められているが、未だ
１５emu ／ｇ以上の飽和磁化を有すると同時に１０ＫＯ
ｅを越える高保磁力を示す低キュリー点磁気記録粉末は
得られていない。Therefore, there is a demand for a low Curie point magnetic recording powder having a higher coercive force than ever before, but it still has a saturation magnetization of 15 emu / g or more and at the same time 10 KO.
No low Curie point magnetic recording powder having a high coercive force exceeding e has been obtained.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明者等は、
飽和磁化を下げることなく高保磁力をもった低キュリー
点磁気記録粉末を得るべく研究を行った結果、原子％で
（以下、％は原子％を示す）、酸化ストロンチウムおよ
び酸化バリウムのうちの１種または２種：１４〜２０
％、酸化クロム：２０〜４０％、酸化銅：２〜１５％、
酸化チタン、酸化ジルコニウム、酸化錫のうちの１種ま
たは２種以上：２〜１５％、を含有し、残りが酸化鉄お
よび不可避不純物からなる成分組成を有し、六方晶フェ
ライト型結晶構造を有する複合酸化物粉末の表面に酸化
マグネシウム膜、酸化カルシウム膜、酸化ストロンチウ
ム膜のうちのいずれかの酸化膜を形成すると、飽和磁化
およびキュリー点が従来とほぼ同じであってかつ保磁力
の一層向上した磁気記録粉末を得ることができるという
研究結果を得たのである。Means for Solving the Problems Accordingly, the present inventors have
As a result of conducting research to obtain a low Curie point magnetic recording powder having a high coercive force without lowering the saturation magnetization, one of strontium oxide and barium oxide in atomic% (hereinafter,% represents atomic%) was obtained. Or 2 types: 14 to 20
%, Chromium oxide: 20-40%, copper oxide: 2-15%,
One or more of titanium oxide, zirconium oxide, and tin oxide: 2 to 15% are contained, and the rest has a component composition of iron oxide and inevitable impurities, and has a hexagonal ferrite type crystal structure. When any one of magnesium oxide film, calcium oxide film and strontium oxide film was formed on the surface of the composite oxide powder, the saturation magnetization and the Curie point were almost the same as the conventional one and the coercive force was further improved. They obtained the research result that a magnetic recording powder could be obtained.
【０００６】この発明は、かかる研究結果に基づいてな
されたものであって、酸化ストロンチウムおよび酸化バ
リウムのうちの１種または２種：１４〜２０％、酸化ク
ロム：２０〜４０％、酸化銅：２〜１５％、酸化チタ
ン、酸化ジルコニウム、酸化錫のうちの１種または２種
以上：２〜１５％、を含有し、残りが酸化鉄および不可
避不純物からなる成分組成を有し、六方晶フェライト型
結晶構造を有する複合酸化物粉末の表面に酸化マグネシ
ウム膜、酸化カルシウム膜、酸化ストロンチウム膜のう
ちのいずれかの酸化膜が形成されている構造の被覆複合
酸化物粉末からなる高い保持力を有する低キュリー点磁
気記録粉末、に特徴を有するものである。The present invention has been made on the basis of the results of such research. One or two of strontium oxide and barium oxide: 14 to 20%, chromium oxide: 20 to 40%, copper oxide: 2 to 15%, one or more of titanium oxide, zirconium oxide, and tin oxide: 2 to 15%, and the balance is iron oxide and inevitable impurities. Highly retentive composed of a coated complex oxide powder having a structure in which any one of a magnesium oxide film, a calcium oxide film, and a strontium oxide film is formed on the surface of a complex oxide powder having a crystalline structure It is characterized by a low Curie point magnetic recording powder.
【０００７】複合酸化物粉末の表面に形成される上記酸
化マグネシウム膜、酸化カルシウム膜、酸化ストロンチ
ウム膜のうちのいずれかの酸化膜の厚さは、複合酸化物
粉末の粒径によっても異なり、特に限定されるものでは
ないが、０．００５〜０．０５μｍの範囲内にあること
が好ましい。その理由は、これら酸化膜の厚さが０．０
０５μｍ未満では磁気記録粉末の保磁力向上に十分な効
果が得られず、一方、０．０５μｍを越える厚さになる
と飽和磁化が低下するので好ましくないことによるもの
である。The thickness of any one of the above-mentioned magnesium oxide film, calcium oxide film and strontium oxide film formed on the surface of the composite oxide powder varies depending on the particle size of the composite oxide powder, and particularly, Although not limited, it is preferably in the range of 0.005 to 0.05 μm. The reason is that the thickness of these oxide films is 0.0
If the thickness is less than 05 μm, a sufficient effect for improving the coercive force of the magnetic recording powder cannot be obtained, while if the thickness exceeds 0.05 μm, the saturation magnetization decreases, which is not preferable.
【０００８】この発明の磁気記録粉末を構成する複合酸
化物粉末の成分組成を上記の如く限定した理由を説明す
る。The reason for limiting the component composition of the composite oxide powder constituting the magnetic recording powder of the present invention as described above will be explained.
【０００９】（ａ） 酸化ストロンチウムおよび酸化バ
リウム これらの成分は、磁気記録粉末に要求される磁気特性を
確保するために必要な、六方晶フェライト型結晶構造を
形成するのに不可欠な成分で、その含有量が１４％未満
でも、また２０％を越えても、飽和磁化が低下すること
から、その含有量を１４〜２０％に定めた。なお、１６
〜１８％の含有量が一層好ましい。(A) Strontium oxide and barium oxide These components are essential components for forming the hexagonal ferrite type crystal structure necessary for ensuring the magnetic properties required for the magnetic recording powder. Even if the content is less than 14% or exceeds 20%, the saturation magnetization decreases, so the content was set to 14 to 20%. 16
A content of ~ 18% is more preferred.
【００１０】（ｂ） 酸化クロム 酸化クロムには磁気記録粉末のキュリー点を下げる作用
があり、その含有量が２０％未満では所望のキュリー点
低下作用が得られず、一方４０％を越えると飽和磁化が
低下することからその含有量を２０〜４０％に定めた。
なお、２５〜３５％の含有量が一層望ましい。(B) Chromium Oxide Chromium oxide has a function of lowering the Curie point of the magnetic recording powder. If the content of chromium oxide is less than 20%, the desired Curie point lowering effect cannot be obtained. Since the magnetization decreases, its content is set to 20 to 40%.
The content of 25 to 35% is more desirable.
【００１１】（ｃ） 酸化銅 酸化銅には、キュリー点の上昇を抑制した状態で、飽和
磁化を高める作用があるが、その含有量が２％未満では
所望の飽和磁化が得られず、一方１５％を越えると飽和
磁化および保磁力が低下することからその含有量を、２
〜１５％と定めた。なお、６〜１１％の含有量が一層望
ましい。(C) Copper Oxide Copper oxide has the effect of increasing the saturation magnetization while suppressing the increase of the Curie point, but if the content is less than 2%, the desired saturation magnetization cannot be obtained. If it exceeds 15%, the saturation magnetization and coercive force will decrease, so the content should be 2%.
It was set at ~ 15%. The content of 6 to 11% is more desirable.
【００１２】（ｄ） 酸化チタン、酸化ジルコニウム、
酸化錫 これらの成分には、飽和磁化を一段と増大させる作用が
あるが、その含有量が２％未満では所望の飽和磁化が得
らず、一方１５％を越えると飽和磁化および保磁力が低
下することからその含有量を、２〜１５％と定めた。な
お、６〜１１％の含有量が一層望ましい。(D) titanium oxide, zirconium oxide,
Tin Oxide These components have the effect of further increasing the saturation magnetization, but if the content is less than 2%, the desired saturation magnetization cannot be obtained, while if they exceed 15%, the saturation magnetization and coercive force decrease. Therefore, the content is determined to be 2 to 15%. The content of 6 to 11% is more desirable.
【００１３】[0013]
【発明の実施の形態】この発明の磁気記録粉末は、炭酸
バリウム粉末、炭酸ストロンチウム粉末、酸化クロム粉
末、酸化銅粉末、酸化チタン粉末、酸化ジルコニウム粉
末、酸化錫粉末および酸化鉄粉末を原料粉末として用意
し、これら原料粉末を混練機にて混合したのち、大気
中、温度：１１５０〜１２５０℃の条件で仮焼し、得ら
れた仮焼体をアトライターにより粉砕したのち、さらに
大気中、温度：１２５０〜１４５０℃の条件で本焼成
し、得られた焼成体をＭｇの酢酸塩、Ｓｒの酢酸塩また
はＣａの酢酸塩の各水溶液と共にアトライターにより微
粉砕し、これを乾燥して得られた微粉砕粉末を大気中、
温度：９００〜１２５０℃で熱処理を行うことにより得
られる。BEST MODE FOR CARRYING OUT THE INVENTION The magnetic recording powder of the present invention comprises barium carbonate powder, strontium carbonate powder, chromium oxide powder, copper oxide powder, titanium oxide powder, zirconium oxide powder, tin oxide powder and iron oxide powder as raw material powders. After preparing and mixing these raw material powders in a kneader, they are calcined in the air at a temperature of 1150 to 1250 ° C., and the obtained calcined body is crushed by an attritor, and then in air Main firing is carried out under the conditions of 1250 to 1450 ° C., and the obtained fired body is finely pulverized with an attritor together with aqueous solutions of Mg acetate, Sr acetate or Ca acetate, and dried to obtain Finely pulverized powder in the atmosphere,
It is obtained by performing heat treatment at a temperature of 900 to 1250 ° C.
【００１４】上記微粉砕粉末に含まれる酢酸塩が、それ
ぞれ酢酸Ｍｇ、酢酸Ｃａ、酢酸Ｓｒの場合は、大気中で
の熱処理により、Ｍｇ（ＣＨ3 ＣＯＯＨ）2 →ＭｇＯ＋
４ＣＯ2 ＋４Ｈ2 Ｏ、Ｃａ（ＣＨ3 ＣＯＯＨ）2 →Ｃａ
Ｏ＋４ＣＯ2 ＋４Ｈ2 Ｏ、Ｓｒ（ＣＨ3 ＣＯＯＨ）2 →
ＳｒＯ＋４ＣＯ2 ＋４Ｈ2 Ｏ、の如く変化し、ＭｇＯ，
ＣａＯ，ＳｒＯが酸化膜として複合酸化物粉末の表面に
形成される。When the acetates contained in the finely pulverized powder are Mg acetate, Ca acetate, and Sr acetate, respectively, Mg (CH 3 COOH) 2 → MgO + is obtained by heat treatment in the atmosphere.
4CO 2 + 4H 2 O, Ca (CH 3 COOH) 2 → Ca
O + 4CO 2 + 4H 2 O, Sr (CH 3 COOH) 2 →
SrO + 4CO 2 + 4H 2 O, MgO,
CaO and SrO are formed on the surface of the composite oxide powder as an oxide film.
【００１５】焼成体をＭｇの酢酸塩、Ｃａの酢酸塩また
はＳｒの酢酸塩の各水溶液と共にアトライターにより微
粉砕するに際し、Ｍｇの酢酸塩、Ｃａの酢酸塩またはＳ
ｒの酢酸塩の添加量は、原料粉末に対して０．５〜３原
子％であることが好ましい。When the fired body is finely pulverized with an aqueous solution of Mg acetate, Ca acetate or Sr acetate by an attritor, Mg acetate, Ca acetate or S
The amount of the acetate salt of r added is preferably 0.5 to 3 atom% with respect to the raw material powder.
【００１６】[0016]
【実施例】原料粉末として、いずれも０．５〜３．０μ
ｍの範囲内の所定の平均粒径を有するＢａＣＯ3 粉末、
ＳｒＣＯ3 粉末、Ｃｒ2 Ｏ3 粉末、ＣｕＯ粉末、ＴｉＯ
2粉末、ＺｒＯ2 粉末、ＳｎＯ2 粉末およびＦｅ2 Ｏ3
粉末を用意し、これら原料粉末を表１、表２および表３
に示される割合で配合し、混練機にて混合したのち、表
１、表２および表３に示される条件で仮焼し、得られた
仮焼体をアトライターにより粗粉砕し、粗粉砕粉末をさ
らに表１、表２および表３に示される条件で本焼成し、
焼成体Ａ〜ｇを作製した。[Embodiment] As raw material powder, 0.5 to 3.0 μm
BaCO 3 powder having a predetermined average particle size in the range of m,
SrCO 3 powder, Cr 2 O 3 powder, CuO powder, TiO
2 powder, ZrO 2 powder, SnO 2 powder and Fe 2 O 3
Powders are prepared and these raw material powders are shown in Table 1, Table 2 and Table 3.
In the proportions shown in Table 1, and after mixing in a kneader, they are calcined under the conditions shown in Table 1, Table 2 and Table 3, and the resulting calcined body is coarsely crushed with an attritor to obtain a coarsely crushed powder. Is further fired under the conditions shown in Table 1, Table 2 and Table 3,
Fired bodies A to g were produced.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【表３】 [Table 3]
【００２０】これら焼成体Ａ〜ｇを表４、表５および表
６に示される割合の酢酸Ｍｇ、酢酸Ｃａまたは酢酸Ｓｒ
の各水溶液と共にアトライターにより、平均粒径：０．
４μｍになるまで微粉砕した後、これを乾燥して得られ
た微粉砕粉末をさらに表４、表５および表６に示される
条件で大気中で熱処理し、表４、表５および表６に示さ
れる成分組成および結晶構造を有する複合酸化物粉末の
表面にＭｇＯ膜、ＣａＯ膜またはＳｒＯ膜を有する被覆
複合酸化物粉末からなる本発明磁気記録粉末１〜２１お
よび比較磁気記録粉末１〜１２を作製した。These fired bodies A to g were mixed with Mg acetate, Ca acetate or Sr acetate in the proportions shown in Table 4, Table 5 and Table 6.
The average particle size: 0.
The finely pulverized powder obtained by finely pulverizing to 4 μm and then drying it was further heat-treated in the atmosphere under the conditions shown in Table 4, Table 5 and Table 6, to give Table 4, Table 5 and Table 6. Magnetic recording powders 1 to 21 of the present invention and comparative magnetic recording powders 1 to 12 each consisting of a coated composite oxide powder having a MgO film, a CaO film or a SrO film on the surface of a composite oxide powder having the indicated component composition and crystal structure. It was made.
【００２１】上記本発明磁気記録粉末１〜２１および比
較磁気記録粉末１〜１２の結晶構造および酸化膜は、そ
れぞれＸ線ディフラクトメーターおよびＸＰＳにより観
察し、確認してその結果を表４、表５および表６に示し
た。The crystal structures and oxide films of the magnetic recording powders 1 to 21 of the present invention and the comparative magnetic recording powders 1 to 12 were observed and confirmed by an X-ray diffractometer and XPS, and the results are shown in Table 4 and Table. 5 and Table 6.
【００２２】さらに、酸化膜の効果を調べるために、焼
成体ＭおよびＮを酢酸塩を加えることなく微粉砕し、得
られた微粉末を大気中で熱処理することにより複合酸化
物粉末からなる比較磁気記録粉末１３および１４を作製
し、その成分組成を表６に示した。Further, in order to examine the effect of the oxide film, the fired bodies M and N were pulverized without adding acetate, and the obtained fine powder was heat-treated in the atmosphere to form a composite oxide powder. Magnetic recording powders 13 and 14 were prepared, and their component compositions are shown in Table 6.
【００２３】さらに、比較のために、特開平７−１３５
１０５号公報に記載の方法で作製した表６に示される成
分組成の複合酸化物粉末からなる従来磁気記録粉末も用
意した。Further, for comparison, Japanese Patent Application Laid-Open No. 7-135
A conventional magnetic recording powder made of a composite oxide powder having the composition shown in Table 6 prepared by the method described in Japanese Patent No. 105 was also prepared.
【００２４】[0024]
【表４】 [Table 4]
【００２５】[0025]
【表５】 [Table 5]
【００２６】[0026]
【表６】 [Table 6]
【００２７】本発明磁気記録粉末１〜２１、比較磁気記
録粉末１〜１４および従来磁気記録粉末についての飽和
磁化、キュリー点および保磁力を測定し、これらの測定
結果を表７および表８に示した。The saturation magnetization, Curie point and coercive force of the magnetic recording powders 1 to 21 of the present invention, the comparative magnetic recording powders 1 to 14 and the conventional magnetic recording powders were measured, and the measurement results are shown in Tables 7 and 8. It was
【００２８】[0028]
【表７】 [Table 7]
【００２９】[0029]
【表８】 [Table 8]
【００３０】[0030]
【発明の効果】表４〜表８に示される結果から、（イ）
本発明磁気記録粉末１〜２１は、従来磁気記録粉末と
比較して、飽和磁化およびキュリー点はほぼ同等である
が、保磁力が格段に優れている、（ロ） 本発明磁気記
録粉末１〜２１と比較磁気記録粉末１３および１４とは
複合酸化物粉末の成分組成が同じであるが、酸化膜を有
する本発明磁気記録粉末１〜２１は、酸化膜のない比較
磁気記録粉末と比べて保磁力が格段に優れている、
（ハ） 酸化膜を有する磁気記録粉末であっても、複合
酸化物粉末の成分組成がこの発明の範囲から外れている
比較磁気記録粉末１〜１２は十分な磁気特性が得られな
い、ことなどがわかる。From the results shown in Tables 4 to 8, (a)
The magnetic recording powders 1 to 21 of the present invention have substantially the same saturation magnetization and Curie point as compared with the conventional magnetic recording powders, but the coercive force is remarkably excellent. 21 and the comparative magnetic recording powders 13 and 14 have the same component composition of the composite oxide powder, but the magnetic recording powders 1 to 21 of the present invention having an oxide film are more protected than the comparative magnetic recording powder having no oxide film. The magnetic force is remarkably excellent,
(C) Even if the magnetic recording powder has an oxide film, the comparative magnetic recording powders 1 to 12 in which the component composition of the composite oxide powder is out of the range of the present invention cannot obtain sufficient magnetic characteristics. I understand.
【００３１】上述のように、この発明の磁気記録粉末
は、従来の磁気記録粉末の飽和磁化およびキュリー点と
ほぼ同じであるにもかかわらず高保磁力を有するところ
から、磁気ノイズを受ける環境下で使用する磁気カー
ド、磁気テープ、磁気ディスクを製造するための磁気記
録粉末として優れた効果を奏するものである。As described above, the magnetic recording powder of the present invention has a high coercive force even though it has almost the same saturation magnetization and Curie point as those of the conventional magnetic recording powder. It has excellent effects as a magnetic recording powder for producing magnetic cards, magnetic tapes and magnetic disks to be used.
Claims (3)
たは２種：１４〜２０％、 酸化クロム：２０〜４０％、 酸化銅：２〜１５％、 酸化チタン、酸化ジルコニウム、酸化錫のうちの１種ま
たは２種以上：２〜１５％、を含有し、残りが酸化鉄お
よび不可避不純物からなる成分組成を有し、六方晶フェ
ライト型結晶構造を有する複合酸化物粉末の表面に酸化
マグネシウム膜が形成されている構造の被覆複合酸化物
粉末からなることを特徴とする高い保磁力を有する低キ
ュリー点磁気記録粉末。1. In atomic%, one or two of strontium oxide and barium oxide: 14 to 20%, chromium oxide: 20 to 40%, copper oxide: 2 to 15%, titanium oxide, zirconium oxide, Surface of composite oxide powder containing one kind or two or more kinds of tin oxide: 2 to 15%, and having the composition of the balance consisting of iron oxide and inevitable impurities, and having a hexagonal ferrite type crystal structure A low Curie point magnetic recording powder having a high coercive force, which is composed of a coated composite oxide powder having a structure in which a magnesium oxide film is formed on the surface of the composite oxide powder.
たは２種：１４〜２０％、 酸化クロム：２０〜４０％、 酸化銅：２〜１５％、 酸化チタン、酸化ジルコニウム、酸化錫のうちの１種ま
たは２種以上：２〜１５％、を含有し、残りが酸化鉄お
よび不可避不純物からなる成分組成を有し、六方晶フェ
ライト型結晶構造を有する複合酸化物粉末の表面に酸化
カルシウム膜が形成されている構造の被覆複合酸化物粉
末からなることを特徴とする高い保磁力を有する低キュ
リー点磁気記録粉末。2. In atomic%, one or two of strontium oxide and barium oxide: 14 to 20%, chromium oxide: 20 to 40%, copper oxide: 2 to 15%, titanium oxide, zirconium oxide, Surface of composite oxide powder containing one kind or two or more kinds of tin oxide: 2 to 15%, and having the composition of the balance consisting of iron oxide and inevitable impurities, and having a hexagonal ferrite type crystal structure A low Curie point magnetic recording powder having a high coercive force, which is composed of a coated complex oxide powder having a structure in which a calcium oxide film is formed on the surface.
たは２種：１４〜２０％、 酸化クロム：２０〜４０％、 酸化銅：２〜１５％、 酸化チタン、酸化ジルコニウム、酸化錫のうちの１種ま
たは２種以上：２〜１５％、を含有し、残りが酸化鉄お
よび不可避不純物からなる成分組成を有し、六方晶フェ
ライト型結晶構造を有する複合酸化物粉末の表面に酸化
ストロンチウム膜が形成されている構造の被覆複合酸化
物粉末からなることを特徴とする高い保磁力を有する低
キュリー点磁気記録粉末。3. In atomic%, one or two of strontium oxide and barium oxide: 14 to 20%, chromium oxide: 20 to 40%, copper oxide: 2 to 15%, titanium oxide, zirconium oxide, Surface of composite oxide powder containing one kind or two or more kinds of tin oxide: 2 to 15%, and having the composition of the balance consisting of iron oxide and inevitable impurities, and having a hexagonal ferrite type crystal structure A low Curie point magnetic recording powder having a high coercive force, which is composed of a coated complex oxide powder having a structure in which a strontium oxide film is formed on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7272016A JPH0992518A (en) | 1995-09-26 | 1995-09-26 | Low curie point magnetic recording powder with high coercive force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7272016A JPH0992518A (en) | 1995-09-26 | 1995-09-26 | Low curie point magnetic recording powder with high coercive force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0992518A true JPH0992518A (en) | 1997-04-04 |
Family
ID=17507963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7272016A Withdrawn JPH0992518A (en) | 1995-09-26 | 1995-09-26 | Low curie point magnetic recording powder with high coercive force |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0992518A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939590A (en) * | 2021-03-12 | 2021-06-11 | 电子科技大学 | Hexahexaferrite material for X-band quasi-planar device and preparation method thereof |
-
1995
- 1995-09-26 JP JP7272016A patent/JPH0992518A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939590A (en) * | 2021-03-12 | 2021-06-11 | 电子科技大学 | Hexahexaferrite material for X-band quasi-planar device and preparation method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20021203 |