• 제목/요약/키워드: GMI

검색결과 52건 처리시간 0.023초

펄스형 레이저를 비정질 와이어 거대 자기교류저항전류 향상 (Enhanced Giant Magnetoimpedance in Co-based Microwire by Pluse Nd:YAG laser)

  • 이봉상;김철기;김종오;임영우;김란;김기덕;안승준;윤석수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2002년도 춘계학술대회 논문집 초전도 자성체
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    • pp.76-78
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    • 2002

  • The influence of laser annealing on gaint magnetoimpedance effect of glass-covered Co-based amorphous microwires is investigated by illuminating pulse Nd:YAG laser on the etched microwires. The maxium GMI ratio reaches maximum of around 85 % at the frequency of 5 MHz for the sample iluminated by the pulse with laser energy fo 132 mJ/pulse.

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Temperature dependence of permeability and magnetoimpedance effect in $Co_{70}Fe_5Si_{15}Nb_{2.2}Cu_{0.8}B_7$ ribbons

  • Phan, Manh-Huong;Kim, Yong-Seok;Quang, Pham-Hong;Yu, Seong-Cho;Nguyen Chau;Chien, Nguyen-Xuan
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2003년도 하계학술연구발표회 및 한.일 공동심포지엄
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    • pp.88-89
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    • 2003

  • During the past decade, giant magnetotransport phenomena such as giant magetoresistance (GMR) in thin films and in manganese perovskites, and, giant magnetoimpedance (GMI) in soft magnetic amorphous ribbons, have brought much interest in the basic physical understanding and their applications as magnetic recording heads and in magnetic sensors technology. Among the parameters required for the quality of a magnetic sensor, temperature dependences of GMR and GMI profiles are playing an important role. In the present work, we have studied temperature dependences of the longitudinal permeability and giant magnetoimpedance effect in $Co_{70}$F $e_{5}$S $i_{15}$ N $b_{2.2}$C $u_{0.8}$ $B_{7}$ amorphous ribbons expecting as a promising candidate in the domain of magnetic sensors.rs.rs.rs.s.

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Ultra Low Field Sensor Using GMI Effect in NiFe/Cu Wires

  • Kollu, Pratap;Kim, Doung-Young;Kim, Cheol-Gi
    • Journal of Magnetics
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    • 제12권1호
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    • pp.35-39
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    • 2007

  • A highly sensitive magnetic sensor using the Giant MagnetoImpedance effect has been developed. The sensor performance is studied and estimated. The sensor circuitry consists of a square wave generator (driving source), a sensing element in a form of composite wire of a 25 $\mu$m copper core electrodeposited with a thin layer of soft magnetic material ($Ni_{80}Fe_{20}$), and two amplifier stages for improving the gain, switching mechanism, scaler circuit, an AC power source driving the permeability of the magnetic coating layer of the sensing element into a dynamic state, and a signal pickup LC circuit formed by a pickup coil and an capacitor. Experimental studies on sensor have been carried out to investigate the key parameters in relation to the sensor sensitivity and resolution. The results showed that for high sensitivity and resolution, the frequency and magnitude of the ac driving current through the sensing element each has an optimum value, the resonance frequency of the signal pickup LC circuit should be equal to or twice as the driving frequency on the sensing element, and the anisotropy of the magnetic coating layer of the sensing wire element should be longitudinal.

  • https://doi.org/10.4283/JMAG.2007.12.1.035 인용 PDF KSCI