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    Synthesis and investigation of properties of barium titanate doped with ferromagnetic materials for use in spin field effect transistors

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    Author
    Kulkarni, Kapildev
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    URI
    http://hdl.handle.net/11122/6017
    Abstract
    The fundamental aspect of this research was to synthesize nano particles of certain materials and to investigate their properties related to potential use in spin-field effect transistor (Spin-FET). Barium titanate was doped with ferromagnetic material and nano particles of this material were synthesized using a sol-gel process. Sol-gels were characterized for their size and shape using an atomic force microscope and a scanning electron microscope. Composition of these compounds and the distribution of dopents were investigated using x-ray fluorescence and the scanning electron microscope. Dielectric properties were measured using high precision impedance, capacitance, and resistance (LCR) meter. Barium titanate, when doped with ferromagnetic materials, becomes ferroelectric material. Ferroelectric materials have finite polarization even in the absence of an applied electric field, which can be exploited for their use as source/drain in spin-FET. The sintering temperature and pH of the sol-gel solution play important roles in determining the dielectric constants, particle size and distribution of dopent in barium titanate. It was found that iron has advantage over nickel and cobalt as a dopent, as it has high electrical susceptibility.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2004
    Table of Contents
    1. Introduction -- 1.1. Spin-FET -- 1.2. Fermi level -- 1.3. Fermi function -- 1.4. Density of states -- 1.5. Spin-FET operation -- 1.6. Rashba field -- 1.7. Tunneling phenomenon -- 1.8. Material selection -- 1.9. Purpose of the project -- 2.0. Literature review -- 2.1. Spin electronics -- 2.2. Overview of the progress of Spin-FET -- 2.3. Unique properties -- 2.4. Applications -- 2.5. Current & future developments -- 3. Experimental procedures -- 3.1. Outline of the project -- 3.2. Sol-Gel process -- 3.2.1. Synthesis of titania nanoparticles -- 3.2.2. Synthesis of iron doped barium titanate nanoparticles -- 3.2.3. Synthesis of cobalt doped barium titanate & nickel doped barium titanate -- 3.3. Sample preparation & characterization -- 3.3.1. Atomic force microscope -- 3.3.2. AFM images -- 3.3.3. Image analysis -- 3.3.4. Characterization using SEM -- 3.3.5. SEM images -- 3.4. Qualitative analysis -- 3.5. Quantitative analysis -- 3.6. Pellet making & sintering -- 3.7. Dopent distribution -- 3.8. Porosity measurement -- 3.9. Measurement of properties -- 4. Results & discussion -- 4.1. Dielectric constant -- 4.2. Dissipation factor -- 4.3. Sintering effect 4.4 -- Effect of pH on the particle size & distribution of dopent -- 5. Conclusions & recommendations -- 5.1. Conclusions -- 5.2. Recommendations -- References.
    Date
    2004-05
    Type
    Thesis
    Collections
    Older Theses Not Clearly Affiliated with a Current College
    Theses (Mechanical Engineering)

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