Global ETD Search
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 30 for “"magnetic response"”.
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Patterns of electro-magnetic response in topological semi-metals
… of matter which have robust and unique electromagnetic responses and surface states. In this thesis, we consider semimetals which have point like Fermi surfaces in various spatial dimensions $D=1,2,3$ which naturally occur in the transition between $n$th order weak topological insulators and a …
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Some Properties of the Magnetic Response of Mesoscopic Superconducting Rings
Results of Chapter 1 and partially Chapter 2 have been presented in the following publications: V. Vakaryuk Phys. Rev. Lett. 101, 16 (Oct 2008), 167002; V. Vakaryuk, A.J. Leggett Phys. Rev. Lett. 103, 5 (Jul 2009), 057003.
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Some properties of the magnetic response of mesoscopic superconducting rings
… periodicity in observable quantities such as magnetic response. The violation of the hc/2e periodicity is usually attributed to the loss of superconductivity. Here we conclude that it is also possible in the superconducting state. In the subsequent Chapters we focus our attention on the topic …
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On the Typical and Average Contributions to the Persistent Current in Mesoscopic Rings
Low-temperature measurements of the magnetic response of one or more electrically-isolated, micron-sized metallic rings yield an unexpected yet unequivocal result: the presence of equilibrium <i>persistent</i> currents, with nanoampere-sized amplitudes and either <i>h/e</i>- or …
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Radio frequency heating of magnetic perovskite nanoparticles in solution for biomedical applications
Magnetic nanoparticles (MNPs) are widely used in many different sectors especially within biological applications for heat generation or as contrast agents in magnetic resonant imaging. Our research concentrates on the magnetic susceptibility of MNPs and the effect on heat generation applications …
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The response of transformers to geomagnetically induced- like currents
… of the transformers’ electrical and magnetic response. This developed protocol can also be useful when extended to investigate the response of large power transformers, particularly for the generation of mitigation parameters that are valuable to power utilities..
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Applying scanning probe microscopy for the investigation of molecular self-assembly mechanisms and properties of designed nanomaterials
… and properties of systems of nanopigments and magnetic metal nanoparticles. For thin films of organic dye dispersions composed of pigment nanoparticles, the stability and spectral properties were examined using AFM as well as other established analytical techniques. Changes in surface …
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Nanophotonics for dark materials, filters, and optical magnetism
… stack, and structures exhibiting homogenizable magnetic properties at infrared frequencies. The graphene stack can be treated as a effective, homogenized medium that can be designed to reflect little light and absorb an astoundingly high amount per unit thickness, making it an ideal dark …
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Controlled synthesis and characterization of templated, magneto-responsive nanoparticle structures
Magnetic fluids are colloidal dispersions of magnetic nanoparticles that are stable with respect to gravitational and moderate magnetic fields because of their small particle size, and to unbounded aggregation due to their surface coatings. The interaction between individual magnetic nanoparticles …
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Terahertz response of microfluidic-jetted fabricated 3D flexible metamaterials
… exhibit some restrictions on their electromagnetic properties. Especially in terahertz region, for example, materials that exhibit magnetic response are far less common in nature than materials that exhibit electric response. However, materials can be designed, namely artificial man-made …
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Optical momentum transfer to macroscopic media
… an alternate approach to predicting the electromagnetic force on material. Direct application of the Lorentz force to media allows for the computation of electromagnetic forces while avoiding a priori assumptions for the form of optical momentum. In this view, the forces exist everywhere in …
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Stress dependence of the magnetic properties of steels
<p>It is well known that the magnetic properties of ferromagnetic materials are sensitive to microstructural and mechanical changes. Variations in applied stress, composition, and geomrtry will, either alone or in combination with each other, cause the magnetization process to change. The primary …
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Angle-Resolved Photoemission Studies on the Many-Body Effects of High-Temperature Superconductor: Bi-2212
… these fluctuations. It describes the magnetic response of the system to perturbations. The imaginary part of this function captures the full spectrum of spin excitations in both the normal and superconducting states. It can be typically measured via inelastic neutron scattering (INS). …
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Numerical study of p-wave superconductivity in Sr2RuO4
… state of Sr2RuO4. This material's magnetic response displays hc=4e periodicity in multiply connected samples, a striking departure from hc=2e periodicity of the Little-Parks effect. One likely explanation for this is that, instead of the Cooper pairs existing in a spin-singlet state …
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Design for selective remote control of cellular signaling using magnetic nanoparticles
… circuit. Heat dissipating properties of magnetic nanoparticles have garnered sustained research interest in biomedical applications, including drug release, cancer hyperthermia, and neural stimulations. However, research has been mainly focused on improving the magnetic nanomaterials' …
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The Mouse Magnetic Compass
All five classes of vertebrates use the geomagnetic field for spatial orientation. The geomagnetic field can be used to derive both 'map' and 'compass' information. There is evidence for two different mechanisms used to sense the magnetic field, the radical pair mechanism (RPM) and the magnetite …
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Transgene-free strategies for wireless control of animal physiology using magnetite nanoparticles
… and cause minimal damage to brain tissue. Magnetic fields are an appealing candidate for wireless therapies because at many frequencies and amplitudes, the human body is similar enough in its magnetic response to vacuum that magnetic fields can penetrate arbitrarily deep. When combined with …
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Synthesis and characterisation of Aurivillius phase materials
… and rotations of the BO6 unit. Substitution of magnetic ions such as iron and manganese at the B-sites has been shown to produce room temperature multiferroic materials. Magnetic coupling between ions requires proximity between the magnetic ions. The work presented in this thesis involves an …
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Magnetic reversal of artificial spin ice
… spin ice refers to an array of elongated ferromagnetic elements, providing a fascinating model system to study novel magnetic behavior induced by frustration. Initially used as a tool to understand the behavior of the frustrated spin systems called spin ice, artificial spin ice has become an …
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Novel Transition-Metal Oxides Under Pressure
… extremes conditions of pressure, temperature or magnetic field so novel phenomena arise (e.g. P ∼100 GPa = 1 Mbar, T ∼1 K, µ0H ∼10 T), which is the case for some high-temperature superconductors and Kitaev quantum spin liquids (KQSLs). In particular, the latter is a frustrated state of matter, …
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