• 제목/요약/키워드: ferroelectric-ferromagnetic composite

검색결과 3건 처리시간 0.024초

강자성-강유전성 복합체를 활용한 자기-기계-마찰전기 변환 발전소자 (Magneto-Mechano-Triboelectric Generator Enabled by Ferromagnetic-Ferroelectric Composite)

  • 임예슬;황건태
    • 한국전기전자재료학회논문지
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    • 제37권1호
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    • pp.112-117
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    • 2024
  • The Internet of Things (IoT) device is a key component for Industry 4.0, which is the network in homes, factories, buildings, and infrastructures to monitor and control the systems. To demonstrate the IoT network, batteries are widely utilized as power sources, and the batteries inevitably require repeated replacement due to their limited capacity. Magneto-mechano-electric (MME) generators are one of the candidate to develop self-powered IoT systems since MME generators can harvest electricity from stray alternating current (AC) magnetic fields arising from electric power cables. Herein, we report a magneto-mechano-triboelectric generator enabled by a ferromagnetic-ferroelectric composite. In the triboelectric nylon matrix, a ferromagnetic carbonyl iron powder (CIP) was introduced to induce magnetic force near the AC magnetic field for MME harvesting. Additionally, a ferroelectric ceramic powder was also added to the MME composite material to enhance the charge-trapping capability during triboelectric harvesting. The final ferromagnetic-ferroelectric composite-based MME triboelectric harvester can generate an open-circuit voltage and a short-circuit current of 110 V and 8 μA, respectively, which were enough to turn on a light emitting diode (LED) and charge a capacitor. These results verify the feasibility of the MME triboelectric generator for not only harvesting electricity from an AC magnetic field but also for various self-powered IoT applications.

Dielectric and Magnetic Properties of BaTiO3-LaMnO3 Composites

  • Kim, N.G.;Koo, Y.S.;Jung, J.H.
    • Journal of Magnetics
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    • 제11권4호
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    • pp.164-166
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    • 2006
  • We have investigated the dielectric and magnetic properties of ferroelectric-antiferromagnetic $BaTiO_{3}-LaMnO_{3}$ composite with changing relative mole percents. Due to high sintering temperature, i.e. $1150^{\circ}C$, the Ba ion in $BaTiO_{3}$ seems to diffuse into $LaMnO_{3}$; resulting in $BaTiO_{3}-(La,Ba)MnO_{3}$ ferroelectric-ferromagnetic composite. At room temperature, $0.9BaTiO_{3}-0.1LaMnO_{3}$ composite exhibits considerable magnetization (${\sim}0.7\;emu/g\;at\;2000\;Oe$) and low coercive field (${\sim}5\;Oe$). Also it exhibits high dielectric constant (${\sim}560$) and low loss (${\sim}0.08$) at 10 kHz. This result may imply that $BaTiO_{3}-LaMnO_{3}$ could be suitable for a low leakage multiferroic composite.

Effect of Magnetic Field on the Dielectric Properties $BaTiO_3-MgFe_2O_4$ Composite

  • Tadi, Ravindar;Kim, Yong-Il;Kim, Cheol-Gi;Ryu, Kwon-Sang
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2011년도 임시총회 및 하계학술연구발표회
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    • pp.93-95
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    • 2011
  • In this study we tried to measure the effect of magnetic field on the dielectric properties of $BaTiO_3-MgFe_2O_4$ soft magnetic composite. Composites with different weight percents of ferroelectric and ferromagnetic phases were subjected to magnetic field in the order of 0 to 450 Oe and the variation of the dielectric properties was observed. The Variation of dielectric polarization was discussed in terms of Maxwell-Wagner type polarization in particulate composites.

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