Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15754
Title: Interfacial induction sustained ferromagnetism - from solution chemistry to ceramics
Authors: TAY SIOK WEI
Keywords: Solution chemistry, Magnetic Ceramic, Ferromagnetism, interfacial induction, sol-gel, doped-TiO2
Issue Date: 2-Mar-2007
Source: TAY SIOK WEI (2007-03-02). Interfacial induction sustained ferromagnetism - from solution chemistry to ceramics. ScholarBank@NUS Repository.
Abstract: This PhD research focuses on the development of magnetic ceramic materials and membranes by means of solution chemistry. Lanthanum strontium cobalt oxide composite, (1-x)La2O3/xSrO/Co3O4, was fabricated via synthesis of metallo-organic chelating gels and their magnetic properties were investigated. This study had found that such a heterogeneous tri-oxide composite manifests room temperature ferromagnetism in contrast to its homogeneous counterparts, which has a curie temperature far below room temperature. It was found that this ferromagnetism is due to an intricate interfacial induction between SrO and spinel Co3O4 nano domains in which La2O3 displays a special enhancement effect on its magnetism. Further studies were extended to neodymium strontium cobalt oxide and similar induction effect was observed. Another material of interest was M-TiO2, where M stands for magnetic nano-wedges such as magnetic oxides. A revamped sol-gel coating technique was coined for accomplishing M-TiO2 thin films, and the origin of its ferromagnetism was explored.
URI: http://scholarbank.nus.edu.sg/handle/10635/15754
Appears in Collections:Ph.D Theses (Open)

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