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 65 for “"Spin dynamics"”.
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Spin dynamics in solids
… Part I of the thesis reports unusually fast 13C spin diffusion in adamantane. A calculation of the 13C spin-diffusion rate from first order perturbation theory is presented and compared to the experimental data. There is good agreement between calculation and experiment for relatively small …
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Spin Dynamics in Organic Semiconductors
Organic semiconductors exhibit exceptionally long spin lifetimes, and recent observations of the inverse spin hall effect as well as micrometer spin diffusion lengths in conjugated polymers have spiked interest in employing such carbon-based materials in spintronics applications. The charge …
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Electron spin dynamics in semiconductors
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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THz spin dynamics in collinear antiferromagnets
Contains fulltext : 317916.pdf (Publisher’s version ) (Open Access)
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Spin dynamics of fine magnetic particles
A computer model of fine magnetic particles has been developed based on the Landau-Lifshitz equation. It is a dynamic model which allows the detailed behaviour of the magnetic moments during magnetisation changes to be investigated. The model was initially used to study gyroremanent magnetisation …
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Theory of High Temperature Spin Dynamics
The problems of high-temperature spin dynamics have practical applications in the fields of nuclear magnetic resonance and inelastic neutron scattering. At the same time. those problems represent an important limit for the study of strongly interacting many-body systerns. In this thesis, we …
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NONLINEAR SPIN DYNAMICS AND ULTRA-FAST PRECESSIONAL SWITCHING
… provide a theoretical analysis of magnetization dynamics in nanometer scale structures over picosecond time scales. This research has been motivated by promising technological applications in the area of magnetic data storage, as well as by pure scientific quest for ultra-fast spin dynamics in …
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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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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
Spintronics utilizes the intrinsic spin of electrons to design next-generation electronic devices, reducing power consumption and enabling innovative computing functions. Over the past decades, significant research interest has been directed toward two types of spin-based systems: collective …
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Electrical control of spin dynamics in spin-orbit coupled ferromagnets
… thesis describes the control of magnetisation dynamics using electricity. Direct electrical control of magnetisation is desirable for the development of efficient scalable magnetic memories. In materials with broken inversion symmetry and spin-orbit coupling, electrical current can exert a …
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Molecular and spin dynamics in solid state nuclear magnetic resonance spectroscopy
… spectroscopic data often involve spatial and spin dynamics and interference phenomena between the two. Experimental results are presented which demonstrate several of these phenomena and exploitation of these anomalies to acquire and improve knowledge regarding relevant chemistry. In some …
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Electromagnetically Induced Transparency and electron spin dynamics using superconducting quantum circuits
This thesis is an exploration on superconducting devices, quantum optics, and magnetic resonance. Superconductive quantum circuits (SQC) comprising mesoscopic Josephson junctions can exhibit quantum coherence amongst their macroscopically large degrees of freedom. They feature quantized flux and/or …
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Spin Dynamics in a Tunable Heisenberg Magnet Realized with Ultracold Atoms
Spin is the elementary unit of magnetism. The interactions between many spins give a material its magnetic properties. This thesis focusses on one of the simplest magnetic materials: A one-dimensional chain of spins with tunable nearest-neighbor interactions. This system is described by the …
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Effects of asymmetry on electron spin dynamics in gallium arsenide quantum wells
This work presents optical studies of electron spin dynamics in gallium arsenide (GaAs) quantum wells, focusing on the effect of inversion asymmetric confinement potentials on spin lifetimes in quantum wells grown on (110)-oriented substrates. Inversion asymmetry in the presence of the spin orbit …
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Spin dynamics of bulk and quasi-two-dimensional metal halide based perovskite semiconductors
… metal halide perovskites. Specifically, of their spin dependencies on lattice and many-body interactions. Many of these results were obtained in close collaboration with others, as specified throughout the dissertation. First, we report that spin-dependent exciton interactions modify the exciton …
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1/F Noise & slow spin dynamics in chromium, chromium alloys, and disordered iron zirconium
1/f resistance noise studies of the spin dynamics in two magnetic systems are described in this thesis. In chromium, 1 If noise was used as a probe to study spin density wave polarization dynamics. Measurements of the noise anisotropy in a high quality single crystal of Cr revealed a temperature …
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Spin dynamics of space stations under transient and steady-state excitations and stabilizing responses
An analytical study of the dynamics of manned rotating space stations under various steady-state and transient excitation, such as docking impacts, attitude system torques, and crew motions, has been conducted. The basic equations of motion for the spinning station are developed and expressions …
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¹⁷O and ⁶³Cu NMR study of spin dynamics in low-dimensional spin 1/2 antiferromagnets
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Beyond the isotropic two-dimensional Heisenberg model: Raman scattering studies of the transition between isotropic and anisotropic spin dynamics in Sr2IrO4
… exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in the two …
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