• 전기학회논문지
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• 제64권3호
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• pp.417-421
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• 2015

In this paper, study for B-H curve characteristics of the magnetic material due to tensile stresses of submarine for magnetic silence. For the experiment, made the sample of the material of AH36 and made to a B-H curve Tracer. In addition, design and made a system of stress by the weight in order to apply a tensile stress, it was possible to obtain results for the change of the magnetization.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집
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• pp.515-518
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• 2002

In this study, the ellipsoidal cap type magnetic pole structure was proposed for the electro-magnet in B-H curve tracer. From the simulation for the electro-magnet without specimen, the area of effective uniform field(99% range for the central field value) was considerably increased in case of the newly proposed ellipsoidal cap type magnetic pole than that of the conventional simple-inclined cap type magnetic pole. Also, through the simulation for the electro-magnet with permanent magnet specimen(NaFe30), the optimal Positions of the magnetic field measurement sensor(Hall sensor) were found out in each case and the errors were decreased in case of the newly proposed ellipsoidal cap type magnetic pole.

• E2M - 전기 전자와 첨단 소재
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• 제8권6호
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• pp.787-794
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• 1995

To improvement the magnetic and frequency properties of YIG(Yttrium-Iron Garnet) in microwave region, it is investigated that the effect of $Al^{3+}$ ions on magnetic and frequency characteristics of YIG, using samples of basic YIG composition( $Y_{3}$F $e_{5}$ $O_{l2}$) added with A1$_{2}$ $O_{3}$ from 0 to 2.5 [mol%]. The measurment is conducted mainly for the structural properties and magnetical properties. The structural properties is measured using SEM(Scanning Electro Microscope), EDX(Energy-dispersive X-ray spectrometer) and XRD(X-ray diffraction equipment). The magnetical properties is measured with B-H curve tracer and impedance analyzer. As a result, it is confin-ned that the effect of eddy current loss is minimized while maintaining high saturation flux density of YIG, when YIG is added with 0.5 [mol%] of A1$_{2}$ $O_{3}$.>.>.

• 대한화학회지
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• 제27권3호
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• pp.224-232
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• 1983

$Fe_2O_3$와 $BaCO_3$ 분체를 철제 ball-mill로 각각 5, 15, 30, 80, 200시간 혼합분쇄하여 얻어진 $BaCO_3-Fe_2O_3$계에서 고체반응 및 생성 Ba-ferrite의 자기적 성질에 미치는 분쇄시간의 영향을 조사하였다. 열천칭, X-선 회절기, 주사형전자현미경 및 B-H 이력곡선기 등을 사용하여 조사한 결과 일정시간 이상 분쇄시켰을 때 입자의 응집현상과 함께 초상자성을 띄는 미립자가 생기게 되어 Ba-ferrite의 생성 및 자기적 성질에 중요한 영향을 미친다는 사실을 확인했다.