報告題目:Boosting the Magnetoelectric Coupling Effect in Film Heterostructures by Photon Associated Thermal Treatment
報告人:Prof. Jungho Ryu (Yeungnam University, Korea)
報告時間:2019年1月8日(星期二)上午9:00
報告地點:明故宮校區9號樓506會議室
主辦單位:機械結構力學及控制國家重點實驗室、航空宇航學院、國際合作處
報告內容簡介:
Heterostructured film based magnetoelectric (ME) composites consist of piezoelectric (typically PZT) and magnetostrictive layers are highly desired especially for applications in integrated magnetic/electric devices. The thermal processing, necessary to obtain high quality PZT films with superior functional properties, unavoidably leads to surface oxidation and crystallization of amorphous magnetostrictive metal substrate, and also chemical interdiffusion between two phases. This will deteriorate both of their properties and eventually degrade the ME coupling. Using granule spray in vacuum process (GSV), PZT thick film was deposited on magnetostrictive amorphous metal (Metglas) substrate. The PZT film was annealed with a continuous-wave 560 nm laser radiation to minimize deteriorative effects of general thermal process, such as chemical reaction and/or atomic diffusion, at the interface and crystallization of amorphous Metglas substrate. We have accomplished near-theoretical magnetoelectric performance in laser annealed PZT/Metglas film composites. The thickness dependent dielectric, ferroelectric, and ME properties of the PZT/Metglas composites were found to be related to the corresponding changes in the optical band gap, annealing behavior and crystallization characteristics of the PZT films.
報告人簡介:
Academic/Research Experiences | |
9/2006-2/2018 | Principal Researcher at functional ceramics research group, Korea Institute of Materials Science (KIMS)
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3/2014-2/2017 | Professor at Department of Materials Science and Engineering, Korea University of Science and Technology (UST), Korea
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7/2013-10/2013 | Visiting Faculty at Center for energy harvesting systems and materials (CEHMS), Dept. Mechanical Engineering, Virginia Tech, USA.
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3/2011-2/2013 | Adjunct Professor, Changwon National University.
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9/2001–1/2003 | Post Dr. Researcher at the International Center for Actuators and Transducers (ICAT), MRL, the Penn State University, USA
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3/2001–8/2001 | Visiting Research Assistant under Prof. Kenji Uchino at the International Center for Actuators and Transducers (ICAT), MRL, the Penn State University, USA.
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3/2000–2/2001 | Adjunct Research Assistant under Prof. Kenji Uchino at the International Center for Actuators and Transducers (ICAT), MRL, the Penn State University, USA.
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1997 | Teaching Assistant, Dept. Materials Science and Engineering, Yeungnam University, Korea
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1996 | Research Assistant, Dept. Materials Science and Engineering, Yeungnam University, Korea |