JPH0647518B2 - Single crystal ferrite - Google Patents
Single crystal ferriteInfo
- Publication number
- JPH0647518B2 JPH0647518B2 JP62100930A JP10093087A JPH0647518B2 JP H0647518 B2 JPH0647518 B2 JP H0647518B2 JP 62100930 A JP62100930 A JP 62100930A JP 10093087 A JP10093087 A JP 10093087A JP H0647518 B2 JPH0647518 B2 JP H0647518B2
- Authority
- JP
- Japan
- Prior art keywords
- single crystal
- ferrite
- mol
- crystal ferrite
- tio
- 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 - Lifetime
Links
Landscapes
- Soft Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は磁気ヘッド用単結晶フェライトに関し、特には
Ｓｎを含むＭｎ−Ｚｎフェライトの改良に係るものであ
る。TECHNICAL FIELD The present invention relates to a single crystal ferrite for a magnetic head, and more particularly to improvement of Mn—Zn ferrite containing Sn.
（従来の技術） 従来から磁気ヘッド用材料としてＭｎ−Ｚｎフェライト
単結晶がその磁気特性の優れている点で広く用いられて
いるが、磁気ヘッドに使用した際摺動ノイズが多いとい
う欠点がある。これを改善したものとして、Ｓｎを含む
Ｍｎ−Ｚｎフェライト単結晶が知られているが、このも
のも近年、磁気記録の高密度化に伴い、高周波領域での
磁気特性についてはなお一層の向上が要求されるように
なった。(Prior Art) Conventionally, Mn-Zn ferrite single crystal has been widely used as a material for a magnetic head because of its excellent magnetic characteristics, but it has a drawback that a large amount of sliding noise occurs when it is used for a magnetic head. . An Mn—Zn ferrite single crystal containing Sn is known as an improvement of this, but this has also been further improved in magnetic characteristics in a high frequency region in recent years with the increase in density of magnetic recording. It came to be requested.
（問題解決のための手段） 本発明はこの点にかんがみなされたもので、その要旨は
Ｆｅ２Ｏ３４５〜６５モル％、ＭｎＯ２５〜４５モル
％、ＺｎＯ ５〜２５モル％、ＳｎＯ２0.1〜５モル％
の組成からなる単結晶に、重量比でＬｉ２Ｏ0.01〜2.5
重量％およびＴｉＯ２５重量以下を添加してなる磁気ヘ
ッド用単結晶フェライトにある。(Means for Solving Problems) The present invention has been made in view of this point, and the gist thereof is Fe 2 O 3 45 to 65 mol%, MnO 25 to 45 mol%, ZnO 5 to 25 mol%, SnO 2 0.1 to 5 mol%
Li 2 O 0.01-2.5 by weight ratio
Wt% and 5 wt% or less of TiO 2 are added to the single crystal ferrite for magnetic head.
本発明で始発材料とするＭｎ−Ｚｎ単結晶は、モル百分
率でＦｅ２Ｏ３４５〜６５％、ＭｎＯ ２５〜４５％、
ＺｎＯ ５〜２５％およびＳｎＯ２0.1〜５％からなる
組成のＳｎを含むＭｎ−Ｚｎフェライトであって、この
電気伝導の機構は、ＢサイトのＦｅ2+とＦｅ3+との電子
ホッピング現象である。したがって本発明では電子のホ
ッピングを抑えることで電気抵抗を大きくし、結果とし
て渦電流を低く抑えることをねらったものである。ホッ
ピングを抑えるためにはＦｅイオンと価数の異なるイオ
ンでＢサイトのＦｅイオンを置換し、そのまわりにＦｅ
イオンの電子を引きつけておけばよい。The Mn-Zn single crystal used as the starting material in the present invention has a molar percentage of Fe 2 O 3 45 to 65%, MnO 25 to 45%,
A Zn-containing Mn-Zn ferrite having a composition of 5 to 25% ZnO and 0.1 to 5% SnO 2, and the mechanism of electric conduction is an electron hopping phenomenon between Fe 2+ and Fe 3+ at the B site. is there. Therefore, the present invention aims to increase the electric resistance by suppressing the hopping of electrons and consequently suppress the eddy current to a low level. In order to suppress hopping, Fe ions at the B site are replaced with Fe ions having a different valence,
You just have to attract the ionic electrons.
スピネルフェライトに固溶し、Ｂサイトを優先的に占有
するイオンには、Ｌｉ＋，Ｎｉ2+，Ｃｒ3+，Ｔｉ4+等が
あるが、この中でＦｅイオンと価数が異なるものはＬｉ
＋とＴｉ4+である。Ions that form a solid solution in spinel ferrite and preferentially occupy the B site include Li + , Ni 2+ , Cr 3+ , Ti 4+, etc. Among them, those with different valences from Fe ions Li
+ And Ti 4+ .
以上の理由から、本発明ではＬｉ２Ｏ単独またはこれに
ＴｉＯ２を添加することにより電気抵抗値を高め、渦電
流損失を低く抑えることができる。Ｌｉ２Ｏの添加量を
0.01〜2.5重量％に限定したのは、これより少ないと効
果が少なく、これより多いと単結晶を製造した際に、こ
れが析出するからである。またＴｉＯ２は５重量％以下
でなければならない。この理由は５重量％を超えるとこ
れが析出するからである。好ましい量は0.1〜５重量％
の範囲である。For the above reasons, in the present invention, Li 2 O alone or by adding TiO 2 thereto can increase the electric resistance value and suppress the eddy current loss to be low. The amount of Li 2 O added
The reason why the amount is limited to 0.01 to 2.5% by weight is that if it is less than this range, the effect is small, and if it is more than this range, it precipitates when a single crystal is produced. Further, TiO 2 should be 5% by weight or less. The reason for this is that if it exceeds 5% by weight, it precipitates. The preferred amount is 0.1-5% by weight
Is the range.
添加する方法としては、たとえば同時に前記Ｍｎ−Ｚｎ
フェライト単結晶の溶融体に添加し均一に混合すればよ
い。As a method of adding, for example, the above Mn-Zn is simultaneously added.
It may be added to the melt of the ferrite single crystal and uniformly mixed.
（発明の効果） Ｍｎ−Ｚｎフェライト単結晶にＬｉ２Ｏ，ＴｉＯ２を添
加することにより該結晶中のＦｅ2+とＦｅ3+との電子の
ホッピングを抑え、電気抵抗値を高めた結果、高周波領
域において渦電流損失を少なくすることできる。(Effect of the invention) As a result of adding Li 2 O and TiO 2 to a Mn-Zn ferrite single crystal to suppress electron hopping between Fe 2+ and Fe 3+ in the crystal and increasing the electric resistance value, Eddy current loss can be reduced in the high frequency region.
実施例 組成が Ｆｅ２Ｏ３ 50.2モル％ ＭｎＯ 30.3 〃 ＺｎＯ 16.6 〃 ＳｎＯ２ 2.9 〃 になるように調合した原料を、ボールミルで混合し、乾
燥した後、１２００℃で２hrs仮焼し、ジョークラッシ
ャーにより粉砕して、単結晶用の原料とした。この原料
を白金ルツボに入れ、さらに重量比で ＴｉＯ２ ０〜５wt% Ｌｉ２Ｏ ０〜2.5wt% を添加し、１７００℃で溶解したのち、ルツボを下降さ
せルツボを先端から徐々に冷却し、単結晶を育成した。
得られた単結晶をウェハーにし、比抵抗、透磁率、損失
係数を測定した。その結果を第１表に示す。ただし、透
磁率、損失係数の値は５MHzにおける値である。Example The raw materials prepared so that the composition was Fe 2 O 3 50.2 mol% MnO 30.3 〃 ZnO 16.6 〃 SnO 2 2.9 〃 were mixed in a ball mill, dried and calcined at 1200 ° C for 2 hrs, and then jaw crusher was used. It was crushed to be a raw material for a single crystal. Put this raw material in a platinum crucible, and further add TiO 2 0 to 5 wt% Li 2 O 0 to 2.5 wt% in a weight ratio and melt at 1700 ° C., then lower the crucible and gradually cool the crucible from the tip, Single crystals were grown.
The obtained single crystal was used as a wafer, and the specific resistance, magnetic permeability and loss coefficient were measured. The results are shown in Table 1. However, the values of magnetic permeability and loss coefficient are values at 5 MHz.
Claims (1)
重量％以下を添加してなる磁気ヘッド用単結晶フェライ
ト。1. Fe 2 O 3 45 to 65 mol% MnO 25 to 45 mol% ZnO 5 to 25 mol% SnO 2 0.1 to 5 mol% Li 2 O 0.01 to 2.5 wt% and TiO 2 5
A single crystal ferrite for a magnetic head, which is obtained by adding not more than wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62100930A JPH0647518B2 (en) | 1987-04-23 | 1987-04-23 | Single crystal ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62100930A JPH0647518B2 (en) | 1987-04-23 | 1987-04-23 | Single crystal ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63265895A JPS63265895A (en) | 1988-11-02 |
| JPH0647518B2 true JPH0647518B2 (en) | 1994-06-22 |
Family
ID=14287067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62100930A Expired - Lifetime JPH0647518B2 (en) | 1987-04-23 | 1987-04-23 | Single crystal ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0647518B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2570891B2 (en) * | 1990-06-20 | 1997-01-16 | 日本ビクター株式会社 | Substrate for magnetic head |
| WO2010125626A1 (en) * | 2009-04-27 | 2010-11-04 | 株式会社リケン | Electromagnetic absorber for anechoic chamber |
-
1987
- 1987-04-23 JP JP62100930A patent/JPH0647518B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63265895A (en) | 1988-11-02 |
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