코어/쉘 복합체의 응력에 의한 전기적-자기적 성질 결합에 대한 연구

Title
코어/쉘 복합체의 응력에 의한 전기적-자기적 성질 결합에 대한 연구
Authors
구용성
Keywords
코어쉘복합체의응력에의한전기적자기적성질결합에대한연구
Issue Date
2012
Publisher
인하대학교
Abstract
Recently, there have been lots of attention to the multiferroic materials, in which more than two order parameters coexist and coupled, due to scientific interest and potential application. The number of multiferroic materials are not large, however, because electricity and magnetism are originated from quite different mechanisms, i.e., ion movement for the former and spin of electron for the latter. For the better understanding of the coupling between electricity and magnetism, like magnetoelectric and magnetodielectric phenomena, and for the multifunctional device applications, there have been extensive/intensive researches on two phase composites. In this thesis, I have studied the core/shell type multiferroic composites, composed of ferroelectric and ferromagnetic materials. Among two phase composites, the core/shell structure has the largest interface area between two different phases. I investigated the changes of electric and magnetic properties and their coupling in BaTiO3/g-F
Description
Abstract 3 Abstract in Korean 5 List of Figures 7 Publication list 12 1. Introduction to multiferroics 15 1.1 Multiferroics 16 1.2 Magnetoelectric effect 19 1.3 Single-Phase Multiferroics 22 1.4 Two-Phase Multiferroics 25 1.5 Core/Shell Type composites 29 1.6 Reference 34 2. Experimental details 35 2.1 Ferrite plating in a sonochemical method 36 2.2 Chemical mechanism of ferrite plating 39 2.3 Reference 42 3. BaTiO3/ferrite core/shell composites 43 3.1 Magnetodielectric coupling in core/shell BaTiO3/g-Fe2O3 nanoparticles 44 3.2 Strain-induced magnetoelectric coupling in BaTiO3/Fe3O4 core/shell nanoparticles 58 3.3 Magnetic Property of a-Fe2O3 Nanoparticles Prepared by Sonochemistry and Take-off Technique 72 4. Conclusions 84 Acknowledgements 85
URI
http://dspace.inha.ac.kr/handle/10505/23393
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Theses(물리학 석박사 학위논문)
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