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 17 of 17 for “"Spin pumping"”.
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Spin pumping measurements at interfaces between magnetic metal or insulator and organic semiconductors
Over the last 16 years, organic spintronics has developed into a striving field with exciting reports of extremely long spin diffusion lengths and spin relaxation times in organic semiconductors (OSCs). Easily processed and inexpensive, OSCs are a strong alternative to inorganic materials for use …
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Nonlinear spin waves in magnetic thin films - foldover, dispersive shock waves, and spin pumping
Three 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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Injection, transport and detection of spin currents in organic semiconductors
Research on spin current transport has so far been concentrated around metals, ferromagnetic insulators and inorganic semiconductors, but is still relatively scarce in organic semiconductors. Recently, there have been a few attempts at exploring spin pumping into polymers, which showed promising …
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Spin Currents in Organic Semiconductors
… recently been found to have a comparably large spin diffusion time and length. This makes them ideal candidates for spintronic devices. However, spin injection, transport and detection properties in organic materials have yet to be fully understood. This work studies spin injection from …
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Spin Transport in Organic Semiconductors
… potential for use in solid state devices for spintronics and spin-based information processing. Organic semiconductors composed of mainly light elements appeal to the field of spintronics due to their long spin lifetime originating from their weak spin-orbit coupling. The significant progress …
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Tuning Spin Currents with Ultrathin Heavy Metal Microstructure
All-metallic spintronic heterostructures have the ability to generate pure spin currents at low resistance-area products via spin-orbit coupling. Heavy metal/ferromagnet (HM/NM) bilayers are often used in this context to extract key spin-dependent parameters such as the spin Hall angle, 𝜃, and spin …
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Coherent Interaction Between Laser Photons and Single Spins in InAs Quantum Dots
… interactions between laser photons and single spins in two types of InAs quantum dots. Quantum dots are promising candidates for quantum information applications due the potential for on-demand emission of highly pure and indistinguishable photons. Achieving coherent interactions between …
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… optical techniques have been developed to study spin wave generation in large area patterned thin films and the interaction of different modes. The study revealed the influence of pattern geometry on the spin wave modes and their interference patterns at different distances. Additionally, MAMR …
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Understanding transport processes of organic semiconductors via magnetic resonance methods
… for the solution-processed conjugated polymers. Spins of the mobile electrons, as another degree of freedom aside from charge, are able to serve as a probe to understand the transport processes of the carriers in microscopic scales. The electron spin resonance method excites the precession of …
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Magnetodynamics of pseudo spin valves investigated using co-planar waveguide and spin torque ferromagnetic resonance techniques
Nanocontact spin-torque nano-oscillators (NC-STNOs), based on magnetic multilayers, can generate a wide range of highly nonlinear localized and propagating spin wave modes for use in magnonics. In this thesis, we study some aspects of these structures from the fundamental physics point of view …
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Electrical Manipulation of Spin Dynamics in Ferromagnetic Multi-layers
This thesis explores spin-detection in ferromagnetic materials via two different mechanisms that drive the ferromagnetic resonance – the charge-spin conversion via inverse spin-Hall effect induced by an external charge current and the photon-magnon coupling between ferromagnetic structures and …
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Current-induced torques in ferromagnets at room temperature
… Ta, are studied. The resonance is driven by both spin-transfer torque and Oersted field, and the DC voltage is attributed to both spin rectification and spin pumping. The CITs can be well analysed from the lineshape of the voltage and its dependence on YIG thickness, from which we deduce that the …
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Dynamic Acoustic Control of Semiconductor Quantum Dot-Based Devices for Quantum Light Generation
… quantum dot. The charge has an associated spin that can determine the time bin of a photon, allowing for information encoding in this degree of freedom. We demonstrate coherent operations on this spin and realize a proof-of-principle experiment of the proposed scheme by showing that the …
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Decoherence of Transverse Electronic Spin Current in Magnetic Metals
Transport of spin angular momentum (spin currents) in magnetic thin films is important for non-volatile spin-based memory devices and other emerging information technology applications. It is especially important to understand how a spin current propagates across interfaces and how a spin current …
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Time resolved electrical injection of coherent spin packets through a Schottky barrier
… few years, the manipulation of the electron’s spin degree of freedom for information processing was explored in the new field of spintronics. Future spintronic devices rely on the generation of a spin imbalance in a semiconductor. Electrical spin injection from a ferromagnet into a …
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Exploring the interplay between topological order, magnetism and superconductivity
… the phases exhibited by an interacting quantum spin Hall edge state in the presence of finite chemical potential (applied gate voltage) and spin imbalance (applied magnetic field). We find that the helical nature of the edge state gives rise to orders that are expected to be absent in non-chiral …