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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, Yi-ChunSubject: search.filters.subject.complex oxides

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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
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    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