Fabrication, Characterization and Application of Magnonic Crystals
报告人：丁骏甲, Ph.D. Candidate, National University of Singapore
时间：2012年12月18日15:00-16:30
地点：西一楼一楼会议室
Abstract:
Artificial ferromagnetic nanostructures with periodic magnetization contrasts, which are known as “magnonic crystals” (MCs), is conceived as the magnetic analogue of photonic crystals. Recently, there has been a growing interest in the fundamental understanding of the spin wave (SW) propagation in MCs because of their potential use in a wide range applications, such as microwave resonators, filters and spin wave logic devices. In this talk, a detailed discussion on the fabrication, characterization and application of MCs will be presented. Optical lithography, electron beam lithography and self-aligned shadow deposition techniques have been used to fabricate various kinds of MCs. A systematic investigation of the static and dynamic behaviours of these nanostructures has been performed using broadband ferromagnetic resonance (FMR) spectroscopy, magneto-optical Kerr effect (MOKE) and magnetic force microscopy (MFM). From the application point of view, we have demonstrated the functionality of magnetic logic based on a recon?gurable MC in the form of a meander-type ferromagnetic nanowire array. We have also fabricated a new binary logic cell consisting of two different ferromagnetic materials to scale down the size of the device.
Biography:
Mr Ding Junjia received his BSc in engineering from the Department of Electronic Science and Technology of Huazhong University of Science and Technology in 2007, and his MEng in microelectronics in 2009 from the same university. Currently, he is working towards his Ph.D. at National University of Singapore.During his three years research work in NUS, he has obtained several high-impact findings in the field of Magnonic Crystals (MCs). His works in 1-Dimensional MCs, 2-Dimensinal MCs and other ferromagnetic nanostructures have been published in top journals in the corresponding field, such asPhysical Review Letter, Physical Review B, Advanced Functional Materials, Applied Physical Letter, Europhysics Letter and Journal of Applied Physics.Nine journal papers have been published by him as the first author during his PhD study so far. The total impact factor of these works is about 40.
Mr Ding has attended and presented four research works in two big international conferences in these two years. He was sponsored to attend the IEEE Magnetic Society Summer School this year where he wonBest Presentation Awardduring the summer school.
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