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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Subject: search.filters.subject.complex oxides

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Now showing 1 - 4 of 4
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    Enhanced Magnetocaloric Effect Driven by Interfacial Magnetic Coupling in Self-Assembled Mn3O4-La0.7Sr0.3MnO3 Nanocomposites
    (2015-12-09)
    Vandrangi, Suresh K.
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    Yang, Jan-Chi
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    Zhu, Yuan-Min
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    Chin, Yi-Ying
    ;
    Lin, Hong-Ji
    Magnetic refrigeration, resulting from the magneto caloric effect of a material around the magnetic phase-transition temperature, is a topic of great interest as it is considered to be an alternate energy solution to conventional vapor-compression refrigeration. The viability of a magnetic refrigeration system for magnetic cooling can be tested by exploiting materials in various forms, from bulk to nanostrucutres. In this study, magnetocaloric properties of self-assembled Mn3O4-La0.7Sr0.3MnO3 nanocomposites, with varying doping concentrations of Mn3O4 in the form of nanocrystals embedded in the La0.7Sr0.3MnO3 matrix, are investigated. The temperatures corresponding to the paramagnetic-to-ferromagnetic transitions are higher, and the values of change in magnetic entropy under a magnetic field of 2 T show an enhancement (highest being similar to 130%) for the nanocomposites with low doping concentrations of Mn3O4, compared to that of pure La0.7Sr0.3MnO3 thin films. Relative cooling power remain close to those of La0.7Sr0.3MnO3. The enhanced magnetic phase-transition temperature and magnetocaloric effect are interpreted and evidenced in the framework of interfacial coupling between Mn3O4 and La0.7Sr0.3MnO3. This work demonstrates the potentiality of self-assembled nanostructures for magnetic cooling near room temperature under low magnetic fields.
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    Ferroelectric Control of the Conduction at the LaAlO3/SrTiO3 Heterointerface
    (2013-06-25)
    Vu Thanh Tra
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    Chen, Jhih-Wei
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    Huang, Po-Cheng
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    Huang, Bo-Chao
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    Cao, Ye
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    Complex Oxide-Noble Metal Conjugated Nanoparticles
    (2013-04-11)
    Guo, Jun-Ling
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    Chiou, Yao-De
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    Liang, Wen-I
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    Liu, Heng-Jui
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    Chen, Ying-Jiun
    Hybrid nanoparticles (NPs) composed of multiple components offer new opportunities for next-generation materials. In this study, a paradigm for the noble metal/ternary complex oxide hybrid NPs is reported by adopting pulsed laser ablation in liquids. As model hybrids, gold-spinel heterodimer (Au-CoFe2O4) and gold-pervoskite heterodimer (Au-SrTiO3) NPs are investigated. This work has demonstrated the diverse playgroup of NP conjugation enlarged by complex oxides.
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    Emergent phenomena at multiferroic heterointerfaces
    (2012-10-28)
    Yu, P.
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    Chu, Y. H.
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    Ramesh, R.
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    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    The coupling and reconstruction of electronic degrees of freedom (such as charge, spin and orbital) at a heterointerface can lead to unexpected and exotic states of matter. In this study, using model systems consisting of multiferroic BiFeO3 and ferromagnetic La0.7Sr0.3MnO3, we review the current understanding of a novel interfacial magnetic state formed at the interface, and highlight some possible mechanisms responsible for this interesting phenomenon and identify open questions for future studies.