• Title/Summary/Keyword: CoFeSiB amorphous wire

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A Study on the Fabrication of Amorphous Magnetostrictive Wire (아몰퍼스 자왜 와이어의 제작에 관한 연구)

  • 김대주;정왕일;조남희;신용진;강재덕
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.05a
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    • pp.99-101
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    • 1996
  • This paper is concerned with the fabrication of (Fe,Co)-Si-B amorphous magneto-strictive wire which attracts strong attention as a new sensor material. First, we put the ingot of (Fe$\sub$1-x/Co$\sub$x/)$\sub$77/Si$\sub$8/B$\sub$15/ composition into quartz tube. Then, under the condition of 400MHz and 8kW, we melt and mix the in-got in the high frequency induction furnance. After that, we obtain the magnetostrictive wire of 100∼150$\mu\textrm{m}$ in diameter by injection and rapid quenching within the high rotating water. Finally, we find that the wire is under the amorphous state.

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Influences of Operation Frequency and Excitation Current on Output Signal of Orthogonal Fluxgate Sensor Fabricated with an Amorphous Wire (아몰퍼스와이어를 이용하여 제작한 직교 플럭스게이트 센서의 출력에 미치는 구동 주파수와 여자 전류의 영향)

  • Shin, Kwang-Ho
    • Journal of the Korean Magnetics Society
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    • v.19 no.1
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    • pp.17-21
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    • 2009
  • In this study, we have investigated that the excitation current and operation frequency dependences of the output properties of the orthogonal fluxgate sensor which was fabricated with a Co base amorphous wire and a pick-up coil. The output signal increased linearly with increase of the excitation current below 0.3 A, and decreased with increase of the excitation current over 0.6 A. It was also found that the output increased sensitively with increase of operation frequency below 1.3MHz. The output was 3.8 V at the frequency of 1.3MHz while 1.32 V at 1MHz.

A Study on the Sensing Function of Amorphous Magnetostrictive Wire (아몰퍼스 자왜 와이어의 센싱기능에 관한 연구)

  • 조남희;신용진;서강수;임재근;문현욱
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.11a
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    • pp.89-92
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    • 1996
  • In this paper, we mention the study on the sensing function of amorphous magneto- striction wire with about 125${\mu}{\textrm}{m}$$\Phi$ in diameter. The wire in fabricated by using injection and quenching method under the high speed rotating water flow. The wire\`s compotion is (Fe$_{75}$ $Co_{25}$)$_{77}$Si$_{8}$B$_{15}$ , and generates sharp Matteucci voltage by large Barkhausen jump effect even the weak magnetic field. In this study, we don\`t use pick-up coil. Instead, we apply external magnetic field of 3.6Oe in the direction orthogonal to the wire. Then, we detect Matteucci voltage of 1.lmV to both side of 20cm amorphous-wire. Thus, we find that the fabricated wire has the function necessary as the high sensitive sensor material.l.al.l.

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Optimization of Operation Frequency of Orthogonal Fluxgate Sensor Fabricated with Co Based Amorphous Wire

  • Kim, Young-Hak;Kim, Yongmin;Yang, Chang-Seob;Shin, Kwang-Ho
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.159-162
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    • 2013
  • We present how to optimize the operation condition including frequency of the orthogonal fluxgate sensor in this paper. The orthogonal fluxgate sensor was fabricated with a Co-based amorphous wire with 10 mm long and 100 ${\mu}m$ in the diameter and a 270-turn pickup coil wound on the amorphous wire. In order to investigate the frequency dependence of the sensitivity, output spectra of the sensor which was connected by using a coaxial cable with various lengths of 0.5-5 m were measured with a RF lock-in amplifier. The maximum sensitivities were obtained at different frequencies according to coaxial cable lengths. It was found that the optimal operation frequencies, at which maximum sensitivities were appeared, were almost identical to the frequencies of impedance resonance. The maximum sensitivity and optimal operation frequency were 1.1 V/Oe (${\approx}$ 11000 V/T) and 1.25 MHz respectively.

Effect of Surfactant in Electroless Ni-B Plating for Coating on the Diamond Powder (다이아몬드 분말상에 무전해 Ni-B 도금을 위한 계면활성제의 영향)

  • Yang, Changyol;Yu, Si-Young;Moon, Hwan-Gyun;Lee, Jung-Ho;Yoo, Bongyoung
    • Journal of the Korean institute of surface engineering
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    • v.50 no.3
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    • pp.177-182
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    • 2017
  • The properties of electroless Ni-B thin film on diamond powder with different parameters (temperature, pH, surfactant etc.) were studied. The surface morphology, structure and composition distribution of the Ni-B film were observed by field effect scanning electron microscope (FE-SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD) and Auger electron spectroscopy (AES). The growth rate of Ni-B film was increased with increase of bath temperature. The B content in Ni-B film was reduced with increase of bath pH. As a result the structure of Ni-B film was changed from amorphous to crystalline structure. The PVP in solution plays multi-functional roles as a dispersant and a stabilizer. The Ni-B film deposited with adding 0.1 mM-PVP was strongly introduced an amorphous structure with higher B content (25 at.%). Also the crystallite size of Ni-B film was reduced from 12.7 nm to 5.4 nm.

Development of Magnetoimpedance Sensor Utilizing Soft Magnetic Amorphous Ribbon with Exchange Coupling and Application to Nondestructive Testing (교환결합을 가진 연자성 비정질 리본을 이용한 자기 임피던스 센서 개발과 비파괴검사 응용)

  • Yoon, Seok-Soo;Kim, Gun-Woo;Lee, Sang-Hun;Kim, Cheol-Gi
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.5
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    • pp.401-406
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    • 2008
  • Recently, portable magnetic sensors with high sensitivity are strongly required for various applications such as biosensor, nondestructive testing and directional sensor. A novel magnetic sensor system was developed by utilizing giant magnetoimpedance(MI) effect of soft magnetic ribbons. The sensor system consists of sensing head of $Co_{66}Fe_{4}Si_{15}B_{15}$ ribbon having asymmetric MI characteristics through exchange coupling produced by field-annealing in open air and circuit for signal processing. The sensor system showed almost linear characteristics in dynamic range of $-1\;Oe\;{\sim}\;1\;Oe$ and sensitivity of 10.5 V/Oe. The sensor was applicable to nondestructive testing system to detect defects in wire ropes.