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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Liu, Heng-JuiSubject: search.filters.subject.self-assembled

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Now showing 1 - 3 of 3
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    Magnetic Mesocrystal-Assisted Magnetoresistance in Manganite
    (2014-11-01)
    Yang, Jan-Chi
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    He, Qing
    ;
    Zhu, Yuan-Min
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    Lin, Jheng-Cyuan
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    Liu, Heng-Jui
    Mesocrystal, a new class of crystals as compared to conventional and well-known single crystals and polycrystalline systems, has captured significant attention in the past decade. Recent studies have been focused on the advance of synthesis mechanisms as well as the potential on device applications. In order to create further opportunities upon functional mesocrystals, we fabricated a self-assembled nanocomposite composed of magnetic CoFe2O4 mesocrystal in Sr-doped manganites. This combination exhibits intriguing structural and magnetic tunabilities. Furthermore, the antiferromagnetic coupling of the mesocrystal and matrix has induced an additional magnetic perturbation to spin-polarized electrons, resulting in a significantly enhanced magnetoresistance in the nanocomposite. Our work demonstrates a new thought toward the enhancement of intrinsic functionalities assisted by mesocrystals and advanced design of novel mesocrystal-embedded nanocomposites.
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    Tuning Electronic Transport in a Self-Assembled Nanocomposite
    (2014-06-01)
    Chang, Wei Sea
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    Liu, Heng-Jui
    ;
    Vu Thanh Tra
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    Chen, Jhih-Wei
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    Wei, Tzu-Chiao
    Self-assembled nanocomposites with a high interface-to-volume ratio offer an opportunity to overcome limitations in current technology, where intriguing transport behaviors can be tailored by the choice of proper interactions of constituents. Here we integrated metallic perovskite oxide SrRuO3 - wurzite semiconductor ZnO nanocomposites to investigate the room-temperature metal - insulator transition and its effect on photoresponse. We demonstrate that the band structure at the interface can be tuned by controlling the interface-to-volume ratio of the nanocomposites. Photoinduced carrier injection driven by visible light was detected across the nanocomposites. This work shows the charge interaction of the vertically integrated multiheterostructures by incorporating a controllable interface-to-volume ratio, which is essential for optimization of the design and functionality of electronic devices.
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    Epitaxial Photostriction-Magnetostriction Coupled Self-Assembled Nanostructures
    (2012-08-01)
    Liu, Heng-Jui
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    Chen, Long-Yi
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    He, Qing
    ;
    Liang, Chen-Wei
    ;
    Chen, Yu-Ze
    Self-assembled vertical nanostructures take advantage of high interface-to-volume ratio and can be used to design new functionalities by the choice of a proper combination of constituents. However, most of the studies to date have emphasized the functional controllability of the nanostructures using external electric or magnetic fields. In this study, to introduce light (or photons) as an external control parameter in a self-assembled nanostructure system, we have successfully synthesized oxide nanostructures with CoFe2O4 nanopillars embedded in a SrRuO3 matrix. The combination of photostrictive SrRuO3 and magnetostrictive CoFe2O4 in the intimately assembled nanostructures leads to a light-induced, ultrafast change in magnetization of the CoFe2O4 nanopillars. Our work demonstrates a novel concept on oxide nanostructure design and opens an alternative pathway for the explorations of diverse functionalities in heteroepitaxial self-assembled oxide nanostructures.