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Title: FePt nanocluster assembled films : Fabrication, characterization and properties
Keywords: FePt, nanoparticle, cluster beam deposition, TEM, shape, 3 D
Issue Date: 28-May-2007
Citation: TAN CHIAN YANG (2007-05-28). FePt nanocluster assembled films : Fabrication, characterization and properties. ScholarBank@NUS Repository.
Abstract: There were three focuses for this thesis: (1) the effects of nanocluster forming parameter on the size, shapes and microstructures of FePt nanoparticles, (2) the effects of in-situ/on-line heating on the microstructures and magnetic properties of FePt particles and (3) the effects of SiO2 matrix and post-deposition annealing on the microstructures and magnetic properties of FePt-SiO2 nanocomposite films.TEM techniques such as bright field, dark field, weak beam dark field and high-resolution imaging were used to resolve the three-dimensional (3-D) microstructures of FePt nanoparticles. Particles produced at -100 A?C were smaller icosahedron, whereas particles produced at -170 A?C had different microstructures such as fcc single crystals (cubooctahedron, cubooctahedra, truncated octahedron, octahedron and truncated tetrahedron/truncated bi-tetrahedron), cyclic twinning microstructures/polytetrahedron particles (icosahedron, decahedron, Marks decahedron, star decahedron and truncated icosahedron/bi-icosahedron), lamellar twinning microstructures (platelet and rod microstructures), defective microstructures (twin junctions and faulted truncated octahedron) and poly-particles (incomplete coalescence of particles).
Appears in Collections:Master's Theses (Open)

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