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 47 for “"spin-diffusion"”.
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Spin Diffusion and Other Transport Properties of Liquid Helium-3
Made available in DSpace on 2015-05-12T17:12:29Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6206161.PDF: 3419857 bytes, checksum: 1994e84f27ab8c7f56cd5e562b1e2780 (MD5) Previous issue date: 1962
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Measurement of the spin diffusion rate of dipolar order in single crystal calcium fluoride
… thesis reports on the first measurement of the spin diffusion rate of a two-spin correlated state, known as dipolar order, in a single crystal of calcium fluoride. The experimental results for the component of the spin diffusion rate parallel with the azimuthal axis are ... for the [001] …
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High resolution NMR scattering : the first measurement of spin diffusion rates in a homogeneous solid
The first direct measurement of the rate of spin diffusion through a homogeneous sample was performed as an incoherent NMR scattering experiment. The experiment consists of a combination of pulsed gradient spin echo methods with multiple pulse/ pulsed gradient spatial encoding met.hods. The NMR …
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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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The sensitivity of nuclear magnetic double resonance
… irradiation, evidence was found that the finite spin diffusion rate caused a double resonance energy transfer rate under continuous search field irradiation about 30% less than the transfer rate which would be observed if the spin diffusion were infinitely fast. A theoretical explanation of the …
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Solid state NMR for advanced materials characterization
… to design materials with improved properties. Spin-diffusion NMR represents an established method to investigate domain sizes and morphology of heterogeneous polymers. General analytical solutions were for the first time derived for an one-dimensional process in a model morphology system …
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Quantum spin transport in paramagnetic systems
… of magnetization and energy in systems of spins 1/2 on a lattice at high temperature. This work was motivated by recent experiments which observed "spin diffusion" among the dipolar coupled nuclear spins of the insulator calcium fluoride, under conditions where it was appropriate to neglect …
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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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Ferrofluid spin-up flows from uniform and non-uniform rotating magnetic fields
… azimuthally directed magnetic field, the fluid "spins up" into an almost rigid-body rotation where ferrofluid nanoparticles have both a linear and an angular "spin" velocity. Flow observations are often limited to the ferrofluid free surface due to the opaque nature of the ferrofluid and the …
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Advanced NMR analysis of polymers and biomolecules
… first time for solids under magic angle sample spinning (MAS) conditions. The rotor-synchronized stimulated echo method is introduced as a new tool for the characterization of polymer chain dynamics. A modern procedure for interpreting proton spin-diffusion experiments for different polymer …
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Spin transport in few-layer graphene
Graphene spintronics refers to spin injection, spin transport and spin detection, using magnetic electrodes and single/multilayer graphene. Although it has been very actively researched since 2006, there is still disagreement regarding the spin diffusion length (lsf). This is partially because …
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Investigation of material properties by NMR in low and high magnetic fields
… simple relaxation experiments in low field to diffusion and spin-diffusion in high field. The measurements of porosity and pore size distribution are made with the help of a new mobile magnet, the Halbach magnet. The Halbach scanner has a higher sensitivity than the NMR MOUSE®. The Hahn and …
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Magnetism and spin transport studies on indium tin oxide
… Indium Oxide based materials in next generation spin-transport electronic applications. Initial studies focused on the optimisation of the electrical properties of Indium Oxide (In2O3) and Tin(Sn)-doped Indium Oxide (ITO) thin films grown using DC magnetron sputtering. The manipulation of various …
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Investigation of cell interfaces and strained tissues with solid-state NMR
… a particular focus on the characterisation of spin diffusion, a means to transport magnetisation that is used extensively in later chapters. The following part aims to achieve spatial selectivity on cell samples with ssNMR. The ECM surrounding cells provides an ideal environment that fosters …
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Magnetic properties of dilute solutions of liquid He³ in He⁴ at low temperatures
The spin-diffusion coefficient and magnetic susceptibility of dilute solutions of He3 in He4 has been measured down to about 3moK. These measurements were made on two solutions of nominal concentrations of 1.3 and 5.0% He3 in He4 under their own vapor pressures. The values of the diffusion …
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Advances in studying order and dynamics in condensed matter by NMR
… can provide information about the translational diffusion in liquids, the type and timescale of slow molecular motion in solids as well as about the molecular order, at the same time. In this thesis, molecular transport in liquid samples is studied in terms of susceptibility induced magnetic …
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Magnon Transport in Insulating Magnetic Thin Films
Magnon-mediated spin flow in magnetically ordered insulators enables long-distance spin-based information transport with low dissipation. MAFO (MgAl0.5Fe1.5O4) is a spinel ferrite that has been recently stabilized in epitaxial thin-film form and has a substantial in-plane four-fold magnetic …
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Effects of demagnetizing factors on transient motion of ferrofluid in a uniform rotating magnetic field
… studied. There are two prevailing theories: spin diffusion theory and flow due to non-uniformities in magnetic field within the ferrofluid due to nonuniform demagnetizing factors. This research sought to confirm previous measurements that indicated demagnetizing factors are the primary cause …
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Sensitivity-enhanced nuclear magnetic resonance of biological solids
… increases with the electronic and nuclear spin-lattice relaxation times. Many biological systems, especially membrane proteins, have relatively short nuclear relaxation times even at 10 K. DNP experiments on fd bacteriophage and purple membrane show that significant sensitivity enhancements …
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Exploring Optoelectronic Properties of Twisted and Intercalated Niobium Oxide Dihalides
… properties such as electrical conductivity, spin diffusion length, thermal conductivity, and mechanical strength observe more degrees of freedom than in their bulk material counterpart. Currently, small optical systems comprise of passive devices that are rigid in their light pathing design …
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