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 32 for “"Seebeck effect"”.
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Picosecond Spin Seebeck Effect in Magnetic Insulators
The spin Seebeck effect (SSE) refers to spin current generation in a magnetic insulator/non-magnetic metal heterostructure due to a thermal gradient and most SSE experiments typically use an electric current as heat source. This study uses Terahertz (THz) time-domain emission spectroscopy where a …
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The Seebeck effect in thin film CdS and ZnₓCd₁₋ₓS
Seebeck and resistivity measurements are made on thin film CdS and Zn<sub>x</sub>Cd<sub>1-x</sub>S samples in an apparatus of original design over a temperature range from near liquid nitrogen temperature to room temperature. The temperature dependence of mobility and carrier concentration is …
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Thermal, Electrical, and Spin Transport: Encompassing Low-Damping Ferromagnets and Antiferromagnetic/Ferromagnetic Heterostructures
… advantages. Thermoelectric devices, based on the Seebeck effect, other a passive, carbon-free energy generating solution from waste heat. Although current thermoelectric technology encounters hurdles in achieving optimal efficiencies without intricate designs or complex materials engineering, …
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Artificial Anisotropy for Transverse Thermoelectric Heat Flux Sensing
… encompassed in thermoelectric theory are the Seebeck and Peltier effects. The Seebeck effect is the generation of a voltage in a device that consists of two different materials in the presence of a temperature gradient, while the Peltier effect is the generation of a temperature gradient …
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Sensorless temperature estimation and control of Peltier devices
… electrical potential across the TED. The former effect is known as the Peltier effect; the latter is known as the Seebeck effect. While TEDs are used primarily as heat pumps, they can also serve as temperature sensors. This thesis presents the design for a controller which uses a TED to …
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Nonlinear spin waves in magnetic thin films - foldover, dispersive shock waves, and spin pumping
… nonlinear phenomena of spin waves and the spin Seebeck effect in yttrium iron garnet (YIG)/Pt bi-layer structures are studied in this thesis and are reported in detail in Chapters 4-7. In the fourth chapter, the first observation of foldover effect of nonlinear eigenmodes in feedback ring …
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Modeling of solar thermal selective surfaces and thermoelectric generators
… a heat flux into electrical power via the Seebeck effect. When a thermoelectric generator is inserted between a solar-absorbing surface and a heat sink, a solar thermoelectric generator is created which converts sunlight into electrical power. This thesis describes the design and …
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Spin Shot Noise measurement
… explored the possibility of identifying the effect of spin accumulation on charge shot noise in Pt/h-BN/Au tunnel junctions, where a flicker noise is caused by the thermally excited dynamic defects in the h-BN layer itself. The defect density is on the order of a few per square micron. We …
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Topological Transport Effects and Pure Spin Currents in Nanostructures
Magnetoresistive effects are powerful tools for studying the intricate structure of solid state electronic systems, and have many applications in our current information technology. In particular, the electronic system reflects the crystal symmetry and the orbital structure of the atoms of a given …
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The Interplay of Spin, Charge, and Heat: From Metal/Insulator Heterostructures to Perovskite Bilayers
… (a-Ge) sample via the inverse spin Hall effect (ISHE). In that study we show that commonly used techniques such as differential conductance and delta mode of a paired Keithley 6221/2182a for non-local resistance measurements can lead to false indicators of spin transport. Next, we turn …
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Thermoelectric Properties of Zr0.5Hf0.5Ni1-xPdxSn0.99Sb0.01 and Effect of Nanoinclusions on Transport Properties of Half Heuslers
… and vice-versa. These materials utilize the Seebeck effect for power generation and function without moving parts and are highly reliable. The efficiency of thermoelectric devices is related to the dimensionless figure of merit for the constituent materials, defined as where <em><em>S …
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Spin Currents in Organic Semiconductors
… at ferromagnetic resonance due to increase in effective Gilbert damping by spin pumping from a ferromagnetic substrate into an adjacent non-magnetic semiconductor allows us to quantify the spin-mixing conductance. This technique is employed to demonstrate spin injection from a ferromagnetic …
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Heat transport in Thermoelectric materials: from Layered systems to organic crystals
… convert wasted heat into electricity using the Seebeck effect. A good material for TE application should have with low thermal conductivity (k) and high Seebeck coefficient and electrical conductivity, because TE generators efficiency is inversely proportional to the first property and directly …
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Effect of phonon transport on the Seebeck coefficient and thermal conductivity of silicon nanowire arrays
… conversion of heat to electricity by the Seebeck effect, but must provide scalable and cost-effective technology for practical waste heat harvesting. This dissertation explores the thermoelectric properties of electrochemically etched silicon nanowires through experiments, complemented by …
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Investigation of Spinel Ferrite Thin Films for Spintronics Applications
… in ferrite-based microwave devices, spin-Seebeck effect (SSE)-based thermoelectric devices, and magnetostrictive device applications by presenting a successful fabrication and characterization of high-quality (Ni, Co, Fe)−Fe₂O₄ thin films with minimal defects, grown epitaxially on single …
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Investigation of spin-caloric and spin-orbit torque materials by vectorial spin Seebeck measurements and an advanced x-ray magnetic reflectivity analysis
… Most fundamentally, the inverse spin galvanic effect (ISGE) can directly generate a non-equilibrium spin polarization which subsequently induces a spin-orbit torque (SOT) on the magnetization. Phenomena like the ISGE take advantage of the relativistic momentum transfer between electron and spin …
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Solar thermoelectrics for small scale power generation
… power generation technology. Utilizing the Seebeck effect, the thermoelectric devices can be used as heat engines to convert heat into electricity. With no moving parts, the generators are considered highly reliable with low maintenance, which is essential for decentralized power source. …
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Thermoelectric waste heat recovery in automobile exhaust systems: Topological studies and performance analysis
… generators (TEGs) that operate using the Seebeck effect. Thermoelectric generators have the potential to recover some of this waste energy in the exhaust stream potentially improving fuel economy by as much as 5%. ^ Attempts are made to maximize the electrical power generation by …
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Nanometer-thick yttrium iron garnet film development and spintronics-related study
… technique most widely used in industry. The spin Seebeck effect (SSE) refers to the generation of spin voltage in a ferromagnet (FM) due to a temperature gradient. The spin voltage can produce a pure spin current into a normal metal (NM) that is in contact with the FM. Various theoretical models …
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Theoretical investigation of thermoelectric properties of bulk and nano-scaled semiconductors
Even though thermoelectric effects have drawn more attention these days due to environmental and economic reasons, the efficiency of the thermoelectric technology is still limited by currently available thermoelectric materials. The priority aim in thermoelectric industry is to achieve a higher ZT, …
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