• 한국자기학회:학술대회 개요집
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• 한국자기학회 2005년도 하계학술연구발표회 논문개요집
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• pp.198-198
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• 2005

• 한국콘텐츠학회논문지
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• 제16권5호
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• pp.660-667
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• 2016

원자력발전 등에 기인한 방사성 오염물질들은 대부분 제염과정을 통하여 방사능과 그 부피를 줄이는데, 물을 주로 사용하는 기존의 방사성 물질 제염방법은 많은 양의 2차 폐기물을 발생시킨다. 본 연구에서는 용매로 이산화탄소의 특성을 이용하여 폐기물 저감에 효과적인 제염 방법을 적용해보았다. 이를 위해 본 연구에서는 우선 원자력 오염물질의 제염 대상을 금속 이온, 금속과 금속산화물로 분류하여 두 가지 방법을 적용하였다. 전자의 경우 계면활성제 킬레이트법을 이용하여 제염하였다. 제염대상 핵종으로는 Sr, Co, Nb, Zr을 선정하였다. Sr과 Co는 각각 핵분열 생성물과 방사화 부식 생성물의 대표 핵종이고 Nb과 Zr은 오염된 방호복에서 가장 많은 방사능을 차지하는 핵종이다. Static Extraction을 통하여 Sr은 최고 97%, Nb과 Co, Zr은 각각 79%, 73%, 64%의 추출율을 얻었다.

• 한국세라믹학회지
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• 제40권4호
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• pp.346-349
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• 2003

Microwave dielectric characteristics and physical properties of the new Zr$_{1-x}$ (Bn$_{1}$3/Nb$_{2/3}$)xTi $O_4$ (0.2$\leq$x$\geq$ 1.0) system have been investigated as a function of the amount of Bn$_{1}$3/Nb$_{2/3}$ $O_2$substitution. With increasing Bn$_{1}$3/Nb$_{2/3}$ $O_2$ content (x), two phase regions were observed: $\alpha$-Pb $O_2$ solid solution (x<0.4), mixture of the rutile type Zn$_{1}$3/Nb$_{2/3}$Ti $O_4$ and the $\alpha$-Pb $O_2$ solid solution (x$\geq$0.4). In the$\alpha$-Pb $O_2$solid solution region below x<0.4, the Q.f$_{0}$ value sharply increased and the Temperature Coefficient of the Resonant Frequency(TCF) decreased with increasing Bn$_{1}$3/Nb$_{2/3}$ $O_2$ contents while dielectric constant (K) showed nearly same value. In the mixture region above x$\geq$4, the dielectric constant and TCF increased with increasing Bn$_{1}$3/Nb$_{2/3}$ $O_2$ content. Zr$_{1-x}$ (Zn$_{1}$3/Nb$_{2/3}$)xTi $O_4$ materials have excellent microwave dielectric properties with K=44.0, Q.f$_{0}$ : 41000 GHz and TCF =-3.0 ppm/$^{\circ}C$ at x=0.35.=0.35. x=0.35.=0.35.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 초전도 자성체 연구회
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• pp.101-104
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• 2003

The maximum coercive force of SmCo thin film was obtained at the Sm=28.2% and dc bias field was generated to CoZrNb, soft magnetic thin film, deposited on the SmCo thin film. DC field point having the maximum permeability for CoZrNb was shifted to higher dc field. DC field strength increased as the length of easy direction of magnetization decreased and 60Oe was measured for $3mm{\times}0.5mm$ sample.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2001년도 춘계연구발표회 논문개요집
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• pp.60-61
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• 2001

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 제5회 학술대회 논문집 일렉트렛트 및 응용기술연구회
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• pp.90-95
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• 2003

The present paper is to investigate the phase stability and soft magnetic properties of amorphous CoNbZr films when Pd is added as a substitution for CoNbZr alloys. The films were prepared by a RF magnetron sputtering method. The CoNbZrPd films deposited on Si wafers exhibited amorphous structures being independent upon the amount of Pd added in the films. On the addition of 4.34% Pd, the excellent soft magnetic characteristics of the films were observed with a coercive force of 0.54 Oe and an anisotropy field of 11 Oe, whereas a coercive force of 1 Oe and an anisotropy field of 3.5 Oe were shown in the film without the addition of Pd. The increased anisotropy field and low coercive force of the films may be attributed to the occupancy of Pd in the preferred sites parallel to the external magnetic field applied on the deposition process. A permeability of about 1100 was kept constant in the operation frequency ranging up to 100 MHz, which can be explained by the Landau-Lifshitz formula.

• 한국전기전자재료학회논문지
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• 제17권1호
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• pp.52-58
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• 2004

Magneto-Impedance(MI) sensor is a highly sensitive sensor, which was able to detect a weak geomagnetic field. It also has a merit to be able to build in the low power system. In this study, their magnetic permeability and anisotropy field(H$\sub$k/) as a function of some different thickness of sputtered amorphous CoZrNb films with zero-magnetostriction and soft magnetic property are investigated. In order to make a uniaxial anisotropy, film was subjected to the post annealing in a static magnetic field with 1KOe intensity at 250, 300, and 320$^{\circ}C$ respectively for 2 hours. Magnetic properties of films are measured by using a M-H loop tracer. Magnetic permeability of a film is measured over the frequency range from 1 ㎒ to 750㎒. By thickening a CoZrNb film relatively, magnetic permeability and impedance are examine to design the. MI sensor which drives at 50㎒, and thereof fabricated the MI sensor which drives at the 50㎒.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.132-135
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• 2002

MI(Magneto-Impedance) sensor which is made by thin films has significantly high detecting sensitivity in weak magnetic field. It also has a merit to be able to build in the low power system. Its structure is simple, which makes it easier to prepare a miniature. In this study, its magnetic permeability and anisotropy field($H_{k}$) as a function of a thickness of sputtered amorphous CoZrNb films with zero-magnetostriction and soft magnetic property are investigated. In order to make a uniaxial anisotropy, film was subjected to the post annealing in a static magnetic field with 1KOe intensity at 250, 300, and $320^{\circ}C$ respectively for 2 hours. Magnetic properties of film are measured by using a MH loop tracer. Its magnetic permeability of a film is measured over the frequency range 1 MHz to 750MHz. And, it was examined on the permeability and impedance to design the MI sensor which acts at 50MHz by thickening a CoZrNb film relatively, and fabricated the MI sensor which acts at the 50MHz.

• 한국반도체및디스플레이장비학회:학술대회논문집
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• 한국반도체및디스플레이장비학회 2002년도 추계학술대회 발표 논문집
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• pp.54-58
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• 2002

The present paper is to investigate the phase stability and soft magnetic properties of amorphous CoNbZr films when Pd is added as a substitution for CoNbZr alloys. The films were prepared by a RF magnetron sputtering method. The CoNbZrPd films deposited on Si wafers exhibited amorphous structures being independent upon the amount of Pd added in the films. On the addition of 4.34% Pd, the excellent soft magnetic characteristics of the films were observed with a coercive force of 0.54 Oe and an anisotropy field of 11 Oe, whereas a coercive force of 1 Oe and an anisotropy field of 3.5 Oe were shown in the film without the addition of Pd. The increased anisotropy field and low coercive force of the films may be attributed to the occupancy of Pd in the preferred sites parallel to the external magnetic field applied on the deposition process. A permeability of about 1100 was kept constant in the operation frequency ranging up to 100 MHz, which can be explained by the Landau-Lifshitz formula.

• 한국자기학회지
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• 제4권1호
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• pp.20-24
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• 1994

CoCr/NiFe 이중매체의 기록, 재생특성은 CoCr 기록층뿐만 아니라 NiFe연자성층의 자기적 특성에도 강하게 영향을 받는다. NiFe/Ge의 다층화로 CoCr/NiFe 매체의 기록감도와 재생전압을 증 가시킬 수 있었으며 이것은 연자성층의 높은 투자율과 CoCr기록층의 높은 수직이방성에 기인하였다. 그러나 연자성층의 투자율의 향상이 기록감도의 현저한 향상에 비해 재생전압의 현저한 증가를 가 져오지 못하는데 이것은 유한요소수치해석에서도 확인할 수 있었다. 반면에 NiFe/Ge 다층연자성박 막을 사용한 CoCr/NiFe 매체의 피크이동(peak shift)특성은 NiFe 단층연자성박막을 사용한 CoCr/NiFe 매체에 비해 악화되었다. 그러나 CoCr층과 NiFe층 사이에 10 nm의 CoZrNb 박막을 삽입시키면 높은 재생전압과 낮은 파크이동을 동시에 얻을 수 있었다. 이 연구에서 는 이러한 기록, 재생특성을 미 세구조와 연관시켜 검토하였다.