JPS6320770B2 - - Google Patents
Info
- Publication number
- JPS6320770B2 JPS6320770B2 JP54162319A JP16231979A JPS6320770B2 JP S6320770 B2 JPS6320770 B2 JP S6320770B2 JP 54162319 A JP54162319 A JP 54162319A JP 16231979 A JP16231979 A JP 16231979A JP S6320770 B2 JPS6320770 B2 JP S6320770B2
- Authority
- JP
- Japan
- Prior art keywords
- mol
- nbo
- ferrite
- magnetic
- added
- 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.)
- Expired
Links
- 239000000696 magnetic material Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 229910000859 α-Fe Inorganic materials 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 229910000473 manganese(VI) oxide Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- HFLAMWCKUFHSAZ-UHFFFAOYSA-N niobium dioxide Inorganic materials O=[Nb]=O HFLAMWCKUFHSAZ-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Soft Magnetic Materials (AREA)
Description
本発明は酸化物磁性材料に関し、特に磁気ヘツ
ド用に適したMnZnフエライト材料に関するもの
である。
磁気ヘツド用磁性材料としては金属からフエラ
イトまで種々の材料が使用されている。これらの
うち、フエライト材料は特に電気抵抗率ρが大き
いため高い周波数まで透磁率μが大きいこと、耐
摩耗性がきわめて優れているため磁気テープ摺動
による損耗量が小さいこと、および化学的に安定
な物質であること等の長所を有するため今日、広
く実用化されている。特に使用周波数が４〜5M
HzであるコンピユーターあるいはVTR等の磁気
ヘツドではほとんどフエライト材料が用いられて
いる状況にある。
しかしながら、フエライト材料を用いた磁気ヘ
ツドは磁気テープを摺動した場合にノイズが大き
いという欠点がある。
本発明は上記従来材の欠点を解消し、磁気テー
プ摺動ノイズが小さな新規な酸化物磁性材料を提
供することを目的とするものである。
上記目的を達するために本発明はMnZnフエラ
イトにNbO2を添加したことを特徴とするもので
ある。
本発明において、上記MnZnフエライト母体の
組成はMnO21〜36モル％、ZnO13〜25モル％、
およびFe2O350〜56モル％からなるものである。
また、本発明においてNbO2添加量は0.5〜5.0wt
％であることが望ましいが、その理由は母体に
NbO2を添加しない場合はヘツド性能の改善は望
めないこと、また、その添加量が7.5％以上を越
えるとμおよびノイズ特性とも著しく低下し、磁
性材料としての性能を発揮し得ないのである。
以下本発明を実施例に基づき詳述する。
実施例 １
MnO29モル％、ZnO18モル％、Fe2O353モル％
なる組成のものに、NbO2を０，0.1，0.5，1.0，
3.0，5.0および7.5wt％の割合で添加し、ボールミ
ルで混合し、乾燥した後、900℃で３時間仮焼し
再びボールミルで粉砕した。粉砕粉の一部はさら
にバインダーを加え造粒し、成形したのち1380℃
で６時間焼成し多結晶フエライト材料を得た。ま
た、上記粉砕粉の一部を白金ルツボに入れ溶融し
たのちルツボを下降させルツボを先端から徐々に
冷却し、単結晶フエライトを育成した。
このようにして得られた多結晶および単結晶フ
エライト材料を用いて磁気ヘツドを作りそのヘツ
ド特性を測定した。その結果を第１表および第２
表に示す。第１表は単結晶フエライトによるトラ
ツク巾60μのVTR用磁気ヘツドの出力およびノイ
ズを4MHzで測定した結果である。
The present invention relates to oxide magnetic materials, and in particular to MnZn ferrite materials suitable for magnetic heads. Various materials are used as magnetic materials for magnetic heads, ranging from metals to ferrite. Among these, ferrite materials have a particularly high electric resistivity ρ, so they have a large magnetic permeability μ up to high frequencies, have extremely high wear resistance, so the amount of wear caused by magnetic tape sliding is small, and are chemically stable. It is widely put into practical use today because it has advantages such as being a flexible material. Especially when the frequency used is 4~5M
Ferrite materials are almost always used in the magnetic heads of Hz computers, VTRs, etc. However, magnetic heads using ferrite materials have the disadvantage that they produce large noise when sliding on a magnetic tape. It is an object of the present invention to provide a new oxide magnetic material that eliminates the drawbacks of the above-mentioned conventional materials and has low magnetic tape sliding noise. In order to achieve the above object, the present invention is characterized in that NbO 2 is added to MnZn ferrite. In the present invention, the composition of the MnZn ferrite matrix is MnO 21 to 36 mol%, ZnO 13 to 25 mol%,
and 50 to 56 mol% of Fe 2 O 3 .
In addition, in the present invention, the amount of NbO2 added is 0.5 to 5.0wt
% is desirable, but the reason for this depends on the mother body.
If NbO 2 is not added, no improvement in head performance can be expected, and if the amount added exceeds 7.5%, the μ and noise characteristics will drop significantly, and the material will not be able to exhibit its performance as a magnetic material. The present invention will be described in detail below based on examples. Example 1 MnO29 mol%, ZnO 18 mol%, Fe 2 O 3 53 mol%
NbO 2 is added to the composition of 0, 0.1, 0.5, 1.0,
They were added in proportions of 3.0, 5.0 and 7.5 wt%, mixed in a ball mill, dried, calcined at 900°C for 3 hours, and ground again in a ball mill. A portion of the pulverized powder is further added with a binder, granulated, molded, and heated to 1380°C.
The material was fired for 6 hours to obtain a polycrystalline ferrite material. Further, a part of the above-mentioned pulverized powder was put into a platinum crucible and melted, and then the crucible was lowered and the crucible was gradually cooled from the tip to grow a single crystal ferrite. Magnetic heads were made using the polycrystalline and single-crystalline ferrite materials obtained in this way, and their head characteristics were measured. The results are shown in Tables 1 and 2.
Shown in the table. Table 1 shows the results of measuring the output and noise of a VTR magnetic head made of single crystal ferrite with a track width of 60μ at 4MHz.
【表】
第２表は多結晶フエライトを用いて作成したオ
ーデイオ用磁気ヘツドの特性の測定結果である。
ヘツドのトラツク巾600μ、テープスピードは47
mm／sec、測定周波数333Hzの条件で測定した。[Table] Table 2 shows the measurement results of the characteristics of an audio magnetic head made using polycrystalline ferrite.
Head track width 600μ, tape speed 47
Measurement was performed under the conditions of mm/sec and measurement frequency of 333Hz.
【表】
第１表および第２表からNbO2を0.5〜5.0wt％
添加したMnZnフエライト材を用いた場合には
VTR用ヘツドでもオーデイオ用ヘツドでもノイ
ズが大巾に改善されることが明らかである。
実施例 ２
組成Ａ MnO25モル％
ZnO25モル％ Fe2O350モル％
組成Ｂ MnO36モル％
ZnO14モル％ Fe2O350モル％
組成Ｃ MnO21モル％
ZnO23モル％ Fe2O356モル％
組成Ｄ MnO31モル％
ZnO13モル％ Fe2O356モル％
より成るそれぞれの母体にNbO21wt％添加した
各組成を実施例１と同様に作成し、単結晶フエラ
イトを得た。次にこれらのフエライトをVTRヘ
ツドに加工し特性を測定した。
その結果を第３表に示す。トラツク巾60μヘツ
ド出力およびノイズは4MHzで測定した。[Table] From Table 1 and Table 2, NbO 2 is 0.5 to 5.0wt%
When using added MnZn ferrite material,
It is clear that noise is greatly improved in both VTR and audio heads. Example 2 Composition A MnO25 mol%
ZnO25 mol% Fe 2 O 3 50 mol% Composition B MnO36 mol%
ZnO 14 mol% Fe 2 O 3 50 mol% Composition C MnO 21 mol%
ZnO23 mol% Fe 2 O 3 56 mol% Composition D MnO3 1 mol%
Each composition was prepared in the same manner as in Example 1, in which 1 wt% of NbO 2 was added to each matrix consisting of 13 mol % of ZnO and 56 mol % of Fe 2 O 3 to obtain single crystal ferrite. Next, we processed these ferrites into VTR heads and measured their characteristics. The results are shown in Table 3. Track width 60μ head output and noise were measured at 4MHz.
【表】
第３表からNbO2の添加はノイズ低減に効果の
あることが明らかである。
以上詳述したごとく本発明酸化物磁性材料すな
わち、組成MnO21〜36モル％、ZnO13〜25モル
％、Fe2O350〜56モル％からなるものにNbO2を
0.5〜5.0wt％添加したMnZnフエライト材料は磁
気ヘツドのノイズを大巾に減少させることができ
るため工業上の効果は大である。また、NbO2の
みでなく、Nb2O3，NbO，Nb2O5等でもNbO2に
換算して、0.5〜5.0wt％なら全く同様な効果はあ
る。[Table] From Table 3, it is clear that the addition of NbO 2 is effective in reducing noise. As detailed above, NbO 2 is added to the oxide magnetic material of the present invention, which has a composition of 1 to 36 mol% MnO, 13 to 25 mol% ZnO, and 50 to 56 mol% Fe 2 O 3 .
The MnZn ferrite material added in an amount of 0.5 to 5.0 wt% can greatly reduce the noise of the magnetic head, and therefore has a great industrial effect. Moreover, not only NbO 2 but also Nb 2 O 3 , NbO, Nb 2 O 5 etc. can have exactly the same effect if it is 0.5 to 5.0 wt% in terms of NbO 2 .
Claims (1)
Fe2O350〜56モル％からなるものに、NbO2を0.5
〜5.0wt％添加含有せしめたことを特徴とする低
摺動ノイズ磁気ヘツド用酸化物磁性材料。1 MnO21-36 mol%, ZnO13-25 mol%,
Fe 2 O 3 50-56 mol %, NbO 2 0.5
An oxide magnetic material for a magnetic head with low sliding noise characterized by containing ~5.0wt% additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16231979A JPS5684321A (en) | 1979-12-14 | 1979-12-14 | Oxide magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16231979A JPS5684321A (en) | 1979-12-14 | 1979-12-14 | Oxide magnetic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5684321A JPS5684321A (en) | 1981-07-09 |
| JPS6320770B2 true JPS6320770B2 (en) | 1988-04-30 |
Family
ID=15752262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16231979A Granted JPS5684321A (en) | 1979-12-14 | 1979-12-14 | Oxide magnetic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5684321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0810274Y2 (en) * | 1989-10-14 | 1996-03-29 | 株式会社シマノ | Rod end structure of fishing rod |
-
1979
- 1979-12-14 JP JP16231979A patent/JPS5684321A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0810274Y2 (en) * | 1989-10-14 | 1996-03-29 | 株式会社シマノ | Rod end structure of fishing rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5684321A (en) | 1981-07-09 |
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