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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 68 for “"multiferroic"”.
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Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices
Complex oxide thin films offer unique functionalities which can potentially extend the utility of current storage, processing and optical isolator technologies. In this thesis, we present three categories of studies on complex oxide growth using pulsed laser deposition (PLD) and structural, …
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Templated Multiferroic Nanocomposites by Ion-Lithography
… one of the most popular VAN structures to study multiferroic coupling. For example, ferroelectric BiFeO3 (BFO) and ferrimagnetic CoFe2O4 (CFO) could grow epitaxially on [001]-SrTiO3 substrate, forming BFO matrix and CFO pillars. In this thesis, we focus on three things: First, the possibility of …
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Templated self-assembly of multiferroic nanocomposites
… colossal magnetoresistance and multiferroicity. New functionalities are especially found at interfaces between two oxides, including emergent electronic states like two-dimensional electron gases, enhanced ionic transport and magnetoelectric coupling, among many other. In this …
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A Micromechanics Study on Ferroelectrics and Multiferroic Composites
… is ferroelectric materials, and the other is the multiferroic composites. Based upon the essential properties of these two types materials, several issues need to be considered in order to study their effective properties. For example, the microstructures of the system including the shape, size …
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Structure-Property Relations on Strain-Mediated Multiferroic Heterostructures
Multiferroic thin-film heterostructures have attracted a great deal of attention due to the increasing demand for novel energy-efficient micro/nano-electronic devices. Both single phase multiferroic materials like BiFeO3 (BFO) thin films, and strain-mediated magnetoelectric (ME) nanocomposites, …
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Anisotropic behaviour of magneto-electric coupling in multiferroic composites
The anisotropy of the direct magnetoelectric effect in textured nickel ferrite/lead zirconate titanate strain mediated bilayer composites has been studied. The magnetic layers of these samples have been crystallographically textured in planes of the form {100}, {110} and {111}. In this study, it is …
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Multiferroic BiFeO3 films and nanostructures for hybrid energy harvesters
… by metal-organic vapor phase deposition of multiferroic BiFeO3 films and nanostructures. BiFeO3 is a multiferroic material and can maintain its properties in extreme environments thanks to its Curie and Neel temperatures well above room temperature. Photoelectric, pyroelectric, and …
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Synthesis and characterisation of materials with potential multiferroic behaviour
… been recorded, as part of an attempt to find multiferroic materials. The information collected would suggest that Bi\(_5\)FeTi\(_3\)O\(_1\)\(_5\) and Bi\(_5\)Fe\(_3\)TiO\(_1\)\(_5\) display some anti-ferromagnetic behaviour, whereas Bi\(_5\)Fe\(_2\)Ti\(_2\)O\(_1\)\(_5\) appears to be a …
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Effects of transition metal doping on multiferroic ordering in ni3v2o8 and fevo4
… and magnetic ions on the phase transitions and multiferroic ordering in two multiferroic oxides; Ni3V2O8 and FeVO4. Magnetic, dielectric, specific heat, polarization and AC susceptibility measurements were used to track changes in phase transition temperatures. We found that the two higher …
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Inelastic light scattering studies of quantum phase transitions in CuxTiSe2 and multiferroic TbMnO3
… correlated systems – the magnetoelectric multiferroic TbMnO3 and the layered dichalcogenide TiSe2 . In general, strongly correlated materials have a strong coupling between charge, spin, lattice and orbital degrees of freedom. Because of the inter- play between various competing orders, …
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Multiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigations
Recently, multiferroics-defined as materials with coexistence of at least two of the ferroelectric, ferroelastic and ferromagnetic effects-have attracted enormous research activities. In this thesis, the structure and properties of multiferrioic BiFeO3-x%PbTiO3 and Fe-x%Ga crystalline solutions …
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Inelastic Light Scattering Studies of Quantum Phase Transitions in Copper Titanium Diselenium and Multiferroic Terbium Manganese Trioxygen
The second focus of this dissertation is the study of quantum phase transitions in TiSe2 as a function of temperature and Cu-intercalation, and the comparison of the effects of intercalation and pressure on the charge-density-wave (CDW) order in this system. All these parameters---temperature, …
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Ab initio investigation of layered and low-symmetry oxides and interfaces: multiferroic junctions, TCO’s, and a ferroelectric metal.
This essay is intended to be a review of the entire resear h work developed during my PhD s hool, highly based on published papers and enri hed by ba kground introdu tions of the debated topi s. My resear h fo used on several distin t topi s sharing the use of ab-initio density fun tional theory al …
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Real-space magnetic imaging of the spinel MnV2O4
Controlling multiferroic behavior in materials will enable the development of a wide variety of technological applications. However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. …
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Design and Testing of the Measuring System for the Characterization of Magnetoelectric Composites
… converse magnetoelectric effect. The research on multiferroic composites is an emerging field of research and there is no commercially available equipment. The method proposed here for testing magnetoelectric properties of the multiferroics is relatively inexpensive and versatile. The advantage of …
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Synthesis and characterisation of Aurivillius phase materials
Multiferroic materials, which are materials that exhibit two or more ‘ferro’ orders in a single phase, such as both ferroelectricity and ferromagnetism in the same phase, are an attractive area of research due to their novel properties and potential uses. Emerging areas of research for multiferroic …
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Spectroscopic study of emergent electronic phases in transition metal based compounds
… storage and processing. Spin spiral type-II multiferroics exhibit an inversion-symmetry-breaking antiferromagnetic order which directly induces ferroelectric polarization, allowing for symmetry protected cross-control between spin chirality and polar order. This intrinsic coupling between the …
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