KR880002423B1 - Mn zn single crystal ferrite - Google Patents
Mn zn single crystal ferrite Download PDFInfo
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- KR880002423B1 KR880002423B1 KR1019850008674A KR850008674A KR880002423B1 KR 880002423 B1 KR880002423 B1 KR 880002423B1 KR 1019850008674 A KR1019850008674 A KR 1019850008674A KR 850008674 A KR850008674 A KR 850008674A KR 880002423 B1 KR880002423 B1 KR 880002423B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/193—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features the pole pieces being ferrite or other magnetic particles
Abstract
Description
제1도는 본 발명에서 사용한 소투자율 측정용 시편의 형태도.1 is a shape of the specimen for measuring the small permeability used in the present invention.
제2도는 본 발명에서 실시한 개략적인 실험과정도.2 is a schematic experimental procedure carried out in the present invention.
제3도는 본 발명에서 측정한 fE+2량(at%)과 Bs(his)의 관계도.3 is a relationship between fE + 2 (at%) and Bs (his) measured in the present invention.
제4도는 본 발명에서 측정한 Fe+2함량(at%)과 μ i의 관제의 Co첨가 효과 곡선도.4 is a graph of the effect of Co addition effect of the control of Fe + 2 content (at%) and μ i measured in the present invention.
제5도는 본 발명에서 사용한 Pt-Rh도가니의 개략적인 구조도.5 is a schematic structural diagram of a Pt-Rh crucible used in the present invention.
제6도는 실시예 1에서 측정한 Fe+2함량(at%)과 DA(%)의 관계도.6 is a relationship between Fe + 2 content (at%) and DA (%) measured in Example 1.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
Bs: 포화 자속밀도(Saturation magnetization)Bs: Saturation magnetization
G: Gauss, KG Kilo. Gauss μ: 투자율(permeability)G: Gauss, KG Kilo. Gauss μ: permeability
D.A: Disaccommodatiom, Tc Curie 온도D.A: Disaccommodatiom, Tc Curie Temperature
μi: 소투자율(initial permeability)μi: initial permeability
Ce: Cersted Hc: 보자력(Coercive force)Ce: Cersted Hc: Coercive force
본 발명에서는 비데오 헤드용 재료인 MnZn페라이트 단결정에 Fe+2이온을 미소량의 Co와 더불어 상당한량을 첨가시켜 기존의 MnZn페라이트 단결정보다 Ms값이 큰 재료를 개발하는데 목적이 있다.An object of the present invention is to develop a material having a larger Ms value than a conventional MnZn ferrite single crystal by adding a considerable amount of Fe + 2 ions together with a small amount of Co to a MnZn ferrite single crystal which is a video head material.
미소량의 Co를 첨가시키고 Fe+2온의 함량을 증가시킬때 MnZn페라이트의 화학식은(Mna Znb Coc Fe+2d)Fe2O4로 된다.(이하 MnZn Ferrous 페라이트로 칭함)When a small amount of Co is added and the content of Fe + 2 is increased, the chemical formula of MnZn ferrite becomes (Mna Znb Coc Fe + 2 d) Fe 2 O 4 (hereinafter referred to as MnZn Ferrous ferrite).
기존의 MnZn페라이트의 Ms와 μi는 각각 Ms=5.0KG, μ=450-650(4.5MHZ)정도의 값을 갖는데 MnZn Ferrous 페라이트 단결정의 경우에는 μ =450-650정도로 갖지만 Me가 5.0-6.9KG의 범위가 된다.Ms and μi of conventional MnZn ferrites have values of Ms = 5.0KG and μ = 450-650 (4.5MHZ), respectively.In the case of MnZn Ferrous ferrite single crystal, μ = 450-650, but Me is 5.0-6.9KG. Range.
또한 D.A는 기존의 MnZn페라이트와 견줄 수 있다.D.A can also be compared with conventional MnZn ferrites.
본 발명은 Ms값을 증가시키는 것으로 Ms증가로 인한 다른 자성을 해치지 않는 방법으로 Fe+2이온과 미소량의 Co를 첨가한 것이다.The present invention is to increase the Ms value by adding Fe + 2 ions and a small amount of Co in a way that does not harm other magnetism due to the increase of Ms.
이 MnZn ferrous 페라이트 단결정의 구체적인 자기적 특성은 다음과 같다. 기존 MnZn 페라이트 단결정의 Bs는 4.5-5.5(KG)인데 비해 MnZn ferrous 페라이트 단결정은 5-6.9KG로 향상되고 기존의 MnZn 페라이트 단결정의 소투자율과 거의 같은 값의 투자율 값을 갖으며 MnZn ferrous페라이트의 경우 단결정 성장시 분위기를 필요로 하지 않고 MnZn ferrous 페라이트의 D.A는 기존 단결정 페라이트와 거의 같은 값을 갖는다.The specific magnetic properties of this MnZn ferrous ferrite single crystal are as follows. The Bs of the conventional MnZn ferrite single crystal is 4.5-5.5 (KG), whereas the MnZn ferrous ferrite single crystal is improved to 5-6.9KG and has the same permeability value as the small permeability of the conventional MnZn ferrite single crystal. In the single crystal growth, the DA of MnZn ferrous ferrite has almost the same value as the existing single crystal ferrite without requiring an atmosphere.
위의 특성을 갖는 MnZn ferrous 페라이트 단결정의 제조과정은 도면 제2도와 같으며 상세한 설명은 다음과 같다.(결정 성장 및 슬라이싱(slicing )The manufacturing process of the MnZn ferrous ferrite single crystal having the above characteristics is shown in FIG. 2 and the detailed description is as follows (crystal growth and slicing).
단결정 페라이트의 결정성장전의 예비처리는 일반적인 세라믹 제품의 예비 처리와 같으며 원료는 Fe2O3, MnCo3, CoO를 사용하였다.Pretreatment before crystal growth of single crystal ferrite is the same as pretreatment of general ceramic products, and the raw materials are Fe 2 O 3 , MnCo 3 , CoO.
도면 제2도에서 처럼 원료를 예비처리한 후 Pt-Rh도가니에 충진시켜 단결정 성장로에 넣어 원료를 용해한 후 단결정을 성장시킨다. 단결정 성장시 완전하게 용해되어 균질화된 후에 강하시켜 seed로부터 단결정을 성장하게 한다.After the raw material is pretreated as shown in FIG. 2, the Pt-Rh crucible is filled into a single crystal growth furnace to dissolve the raw material, and then the single crystal is grown. During single crystal growth, it is completely dissolved, homogenized, and then lowered to grow single crystal from seed.
seed의 방향은 전체결정의 성장방향을 결정하게 되므로 원하는 결정성장방향과 seed방향을 일치하도록 한다.Since the seed direction determines the growth direction of the whole crystal, the seed growth direction should match the seed direction.
성장된 단결정은 열충격에 의해 내부 결함이 발생하는 것을 억제시키기 위해 상온까지 서냉시킨다.The grown single crystal is slowly cooled to room temperature to suppress the occurrence of internal defects due to thermal shock.
이때 1000℃ 이하에서 과잉 산소에 의해 Fe2O3가 생기는 것을 억제시키기 위해 N2분위기나 Ar분위기를 만들어 준다.At this time, in order to suppress the generation of Fe 2 O 3 by excess oxygen at 1000 ° C. or below, N 2 atmosphere or Ar atmosphere is made.
성장으로부터 커낸 단결정은 하부(seed) 부분과 상부를 절단하여 광상법으로 원하는 방향이나 면을 결정한 후 Slicing한다.The single crystal grown from growth is cut by cutting the lower part and the upper part, and then deciding the desired direction or plane by the optical image method and then slicing.
단결정의 성분 분석은 I-선 형광법으로 실시하였으며 Fe+2이온의 함량은 화학적정(titration)방법을 이용하여 ±0.5at% 오차 범위로 측정하였다.Component analysis of single crystals was carried out by I-ray fluorescence, and the content of Fe + 2 ions was measured in the error range of ± 0.5 at% using a chemical titration method.
[소 투자율 측정][Measurement of Small Permeability]
비데오 헤드용으로 쓰이는 단결정 페라이트는 특히 고주파 특성이 좋아야 하는데 현재 주로 사용하는 MnZn페라이트 단결정은 4.5MHZ의 주파수에서 μ i가 600정도이다.Single crystal ferrites used for video heads should have good high-frequency characteristics. MnZn ferrite single crystals, which are currently used, have a μ i of 600 at a frequency of 4.5 MHZ.
본 발명에서 투자율은 복소 투자율로써 측정하였으며 시편은 toroidal형태로 축방향을<110>으로 하였다.In the present invention, the magnetic permeability was measured as a complex magnetic permeability, and the specimen was in the axial direction of <110> in toroidal form.
측정온도는 주로 상온에서부터 비데오 헤드가 작동하는 50℃부근까지로 하였으며 온도변화에 따른 투자율의 변화는 극저온(-196℃)로부터 Tc이상까지 측정하였다.The measurement temperature was mainly from room temperature to around 50 ℃ where the video head operates, and the change of permeability according to temperature change was measured from cryogenic temperature (-196 ℃) to above Tc.
[Ms 측정][Ms measurement]
시편의 Ms는 시편의 온도를 변화시키면서 VSM으로 측청하여 온도의 존성을 조사하였다.The Ms of the specimen was measured with VSM while changing the temperature of the specimen to investigate the temperature dependence.
시편의 형태는 봉상으로 하였다.The specimens were in the form of rods.
MaFeb+2Fe2O4(:M은 MnZn의 합)에서 Fe+2함량의 변화로 Ms와 Tc가 변화하게 된다.The change of Fe + 2 content in MaFeb + 2 Fe 2 O 4 (: M is the sum of MnZn) causes Ms and Tc to change.
Fe+2의 함량(즉 b)는 증가함에 따라 시편의 Tc가 증가하게 되며 극저온에서 Ms는 감소하게 된다.As the Fe +2 content (ie b) increases, the Tc of the specimen increases and Ms decreases at cryogenic temperatures.
저온에서 Ms가 낮아질지라도 Tc가 증가되어 Ms의 온도의 존도가 낮아겨서 상온이상에서는 Ms가 높게 된다.Even if Ms is lowered at low temperature, Tc is increased to decrease Ms temperature dependence, resulting in higher Ms at or above room temperature.
[실시예]EXAMPLE
원료는 상기한 바와 같이 일반적인 세라믹 제품의 예비처리와 같은 MnO 5-20mo1%. Fe2O345-58mol%, Zno 10-20mol%, CoO 0.l-2.0mol%의 조성범위를 갓는 것을 사용했으며 예비처리를 실시하여 단결정 성장로에서(110)방향으로 결정을 성장시켰다.The raw material is MnO 5-20mo1%, such as pretreatment of common ceramic products as described above. The composition range of 45-58 mol% Fe 2 O 3, 10-20 mol% Zno, and 0.1-2.0 mol% CoO was used, and crystals were grown in the direction of (110) in a single crystal growth furnace by pretreatment.
성장된 단결정은 자기적 특성을 조사하기 위해 토로이달(toroidal)과 봉상, 시편으로 만들어 투자율과 Ms를 측정하였다.The grown single crystals were made of toroidal, rods and specimens to investigate their magnetic properties, and the permeability and Ms were measured.
Fe+2이온의 함량 변화에 따른 Bs를 조사하기 위해 Fe+2이온의 함량을 0-11at%까지 변화시켜 VSM으로 측정하였다.In order to investigate the Bs according to the contents in the Fe + 2 ions by changing the content of Fe + 2 ions to 0-11at% it was measured by VSM.
도면 제3도는 20℃에서 Fe+2함량(at%)에 따른 Bs(Ms)의 변화를 나타낸 것이다.Figure 3 shows the change in Bs (Ms) according to the Fe + 2 content (at%) at 20 ℃.
toroidal시료는 시편 표면을 화학 앳칭(etching)하여 표면의 잔유용력을 제거하였다.The toroidal sample was chemically etched on the surface of the specimen to remove residual residual capacity.
도면 제3도에서는 Fe+2함량이 증가할수록 Ms값이 증가하는 것을 나타내고 있는데 이것은 전술한 바와 같이 Fe+2이온이 증가할수록 시편의 Tc가 증가하여 Ms의 온도 의존성이 작아지게 되며 결국 상온(20℃에서 Ms가 증가하게 되는 것이다.In FIG. 3, the Ms value increases as the Fe + 2 content increases. As described above, as the Fe + 2 ion increases, the Tc of the specimen increases, thereby decreasing the temperature dependency of Ms. Ms will increase.
도면 제6도에서는 Fe+2이온이 증가할때 D.A가 증가하고 있음을 나타내고 있는데 D.A가 증가하면 시간에 따른 투자율이 감소하는 크기가 증가하므로 가능한 D.A가 낮을수록 비데오 헤드용으로 사용하는데 유리하다.FIG. 6 shows that DA increases when Fe + 2 ions increase. As DA increases, the permeability decreases with time, and thus, the lower the possible DA, the better the DA.
도면 제3도와 제6도의 두 결과를 비교해볼때 Fe+2의 함량이 증가하면 Ms는 증가하지만 D.A도 증가하게 된다. 그러므로 Fe+2함량을 적당하게 조절하여 D.A도가 크지 않으면서 Ms가 증가하는 범위로서 적정 함량은 여러 실험측을 통해볼때 Fe+2가 3-l5wt%의 함량으로 했을때 비데오 헤드용으로 적절함을 확인할 수 있었다. 그리고, 도면 제4도에서는 동일성분으로 Co가 첨가된 경우와 그렇지 않는 경우의 Fe+2이온 함량의 변화에 따른 투자율의 변화를 나타내고 있다.Comparing the results of FIG. 3 and FIG. 6, when the Fe + 2 content is increased, Ms increases but DA also increases. Therefore, the Fe + 2 content is appropriately adjusted so that Ms can be increased without having a large DA degree, and it can be confirmed that the proper content is suitable for the video head when Fe + 2 is 3-l5wt% based on various experiments. there was. 4 shows the change in permeability according to the change in Fe + 2 ion content when Co is added as the same component and when it is not.
이 결과에서 Co가 첨가되지 않은 경우 Fe+2함량이 증가하면 μi가 급격하게 감소되지만 Co가 미소량 첨가된 경우 Fe+2이온 함량에 따른 μi의 의존성이 감소하여 Fe+2함량이 증가되어도 μi가 그다지 크게 변화하지 않는다.In this result, when Co is not added, the content of Fe + 2 decreases rapidly when μi is increased.However, when Co is added in a small amount, the dependence of μi on Fe + 2 ion content decreases, and even when the Fe + 2 content is increased, μi is very large. Does not change.
본 발명에서 0.5at% Co를 첨가시키고 Fe+2이온을 증가시겨 얻는 자기적 특성은 기존의 MnZn ferrite 보다 Ms가 향상되면서 다른 자기적 특성을 해치지 않는다.In the present invention, the magnetic properties obtained by adding 0.5at% Co and increasing Fe + 2 ions do not harm other magnetic properties as Ms is improved over the existing MnZn ferrite.
결론적으로 Co를 0.1-1at%. Fe+2이온을 10at%첨가시킬때 기존의 MnZn페라이트 단결정과 유사한 자기적 특성을 가지면서 Ms가 6.5KG정도로 향상된 특성을 얻을 수 있다.In conclusion, Co 0.1-1 at%. When Fe + 2 ions are added at 10at%, Ms has a magnetic property similar to that of the conventional MnZn ferrite single crystal and Ms is improved to about 6.5KG.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019850008674A KR880002423B1 (en) | 1985-11-20 | 1985-11-20 | Mn zn single crystal ferrite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019850008674A KR880002423B1 (en) | 1985-11-20 | 1985-11-20 | Mn zn single crystal ferrite |
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| Publication Number | Publication Date |
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| KR870005415A KR870005415A (en) | 1987-06-08 |
| KR880002423B1 true KR880002423B1 (en) | 1988-11-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101053431B1 (en) * | 2008-09-25 | 2011-08-03 | 티디케이가부시기가이샤 | Mn Fern Ferrite |
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1985
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101053431B1 (en) * | 2008-09-25 | 2011-08-03 | 티디케이가부시기가이샤 | Mn Fern Ferrite |
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