Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/7645

Title: Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals
Author: Song, Qing
Abstract: Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite nanocrystals. A general synthetic method is developed for size and shape control of metal oxide nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3O4 nanocrystals. It also addresses the effect of exchange coupling between magnetic hard phase and soft phase upon magnetic properties in core shell structured spinel ferrite nanocrystals. The role of anisotropic shapes of nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4 nanocrystals and the size dependent superparamagnetic properties are described.
Type: Dissertation
URI: http://hdl.handle.net/1853/7645
Date: 2005-08-26
Publisher: Georgia Institute of Technology
Subject: Spinel ferrite
Superparamagnetism
Synthesis
Nanocrystals
Size and shape control
Superlattices
Superstructures
Spinel group Magnetic properties
Ferrites (Magnetic materials)
Ferromagnetism
Nanocrystals
Nanoparticles Magnetic properties
Department: Chemistry and Biochemistry
Advisor: Committee Chair: Zhang, John; Committee Member: Barefield, Kent; Committee Member: El-Sayed, Mostafa; Committee Member: Wang, ZhongLin; Committee Member: Wilkinson, Angus
Degree: Ph.D.

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