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.
Results
Showing 1 to 20 of 60 for “"Magnetic structure"”.
-
Uniform Field Distribution Using Distributed Magnetic Structure
Energy distribution in a conventional magnetic component is generally not at a designer's disposal. In a conventional toroidal inductor, the energy density is inversely proportional to the square of the radius. Thus, a designer would be unable to prescribe uniform field distribution to fully …
-
Magnetic structure in manganites as probed by magnetic force microscopy
This dissertation describes the use of magnetic force microscopy to directly measure the magnetic structure of a sample on a microscopic level. Our magnetic force microscope has been operated at temperatures ranging from 293 to 4.3 K and fields ranging from 0 to 3 T, providing a method for imaging …
-
Synthesis and Characterization of Heusler Compounds with Non-Collinear Magnetic Structure - From Spin Glasses to Spin Reorientation
… the 1000 members known nowadays. Especially many magnetic Heusler compounds display promising properties, which offer potential application in fields like rare-earth free permanent magnets, magnetocalorics, spin transfer torque devices and tunnel junctions. Apart from that, magnetic Heusler systems …
-
Determination of the Magnetic Structure of the Antiferromagnetic State of the Organic Superconductor Kappa-(bedt)(2)copper Dicyanamide Chloride Using Nuclear Magnetic Resonance and Magnetometry
… 13C NMR and magnetometer measurements on the magnetic state of the organic superconductor kappa-(BEDT-TTF)2Cu[N(CN) 2]Cl. Various other magnetization and NMR studies have suggested that there is antiferromagnetic ordering of the electron spins in the magnetic state, but the detailed ordering …
-
Determination of the Magnetic Structure of the Antiferromagnetic State of the Organic Superconductor k-(BEDT)2Cu[N(CN)2]Cl Using Nuclear Magnetic Resonance and Magnetometry
… 13C NMR and magnetometer measurements on the magnetic state of the organic superconductor k-(BEDT-TTF)2Cu[N(CN)2]Cl. Various other magnetization and NMR studies have suggested that there is antiferromagnetic ordering of the electron spins in the magnetic state, but the detailed ordering was …
-
Three-dimensional magnetic domain imaging with polarized neutrons
Application and fundamental understanding of magnetic materials requires knowledge of their properties and phase diagrams, which depend on the structure and dynamics of magnetic domains. Current techniques for studying magnetic domains are limited to imaging near-surface magnetic structure. …
-
Magnetic and Toroidal Symmetry of Lithium Transition Metal Orthophosphates
… along with the structural analog LiMnPO4. Their magnetic susceptibility and magnetic structure were determined and analyzed and found to be consistent with previous reports on single crystal materials. This work also provides a thorough introduction to ferrotoroidicity, a history of its …
-
Studying magnetic and 3D atomic structure using 4D scanning transmission electron microscopy
… I present 4D-STEM experiments for studying magnetic and 3D atomic structure, complemented with simulations to validate those results. First, we explore 4D-STEM techniques for imaging the magnetic structure of antiferromagnets. Antiferromagnets can potentially be used to create faster, more …
-
Preparation and Characterization of Solid Solutions of Ternary and Quaternary Antimony Oxides
… techniques to investigate the structural and magnetic properties. The lab instrument techniques, including lab X-ray powder diffraction, UV-Vis, SEM/EDS and PPMS were employed as the first characterization techniques for the planning of beamline experiments. The first antimony oxide system, …
-
Einfluß der magnetischen Ordnung auf Supraleitung und Kristallstruktur in Seltenerd-Nickel-Borkarbid-Verbindungen
… Neutron diffraction is used to determine the magnetic order and the resulting changes of the crystal structure. Experiments are performed on polycrystalline and single crystal samples in dependence on temperature and external magnetic fields. The Ni-B stoichiometry of the tetragonal RNi2B2C …
-
Synthesis and Properties of New Oxychalcogenide Materials
… and their properties, particularly those with structures similar to systems discussed in the later chapters. Particular attention is paid to the structural and magnetic properties of La2O2Fe2OSe2-type materials, work on which is presented in chapters 3–5. These oxychalcogenides, along with …
-
Compositional tuning, crystal growth, and magnetic properties of iron phosphate oxide
… Fe3PO4O3, is a crystalline solid featuring magnetic Fe3+ ions on a complex lattice composed of closely-spaced triangles. Previous work from our research group on this compound has proposed a helical magnetic structure below T = 163 K attributed to J1-J2 competing interactions between …
-
Phase transitions in thin iron-palladium films
… values as the thickness of the film increased. Magnetic structure below the Curie temperature is revealed in magnetization and a.c. susceptibility curves for x=. 078. For other samples susceptibility data exhibited more sensitivity than magnetization in revealing magnetic detail below the Curie …
-
Analysis and design of a low-ripple coupled-inductor boost topology
… output filter. One "zero-ripple" coupled magnetic provides both energy storage and second-order filtering of the input and output currents. Dc analysis is presented along with design guidelines. A novel magnetic structure is proposed which simplifies design and manufacture, while improving …
-
Cerium and rhodium substitution in the antiferromagnetic superconductor cerium rhodium indium(5)
… has been observed. The dependence of the magnetic transitions of CexLa1-xRhyIr1-y In5 with respect to temperature and magnetic field applied along the tetragonal c and a crystal axes is examined using heat capacity measurements. The magnetic phase diagram of CeRh yIrl-yIn5 for the applied …
-
Multiphase Voltage Regulator Modules with Magnetic Integration to Power Microprocessors
… advanced topologies and innovative integrated magnetics for high-efficiency, high-power-density and fast-transient VRMs. The optimization of multiphase VRMs has also been addressed. Today's multiphase VRMs are almost universally based on the buck topology. With increased input voltage and …
-
Real-space magnetic imaging of the spinel MnV2O4
… understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these …
-
Nanoscale Josephson Devices
… Junctions with normal metal, insulating and ferromagnetic barriers were characterised, as well as the first metallic antiferromagnetic Josephson junctions using γ-Fe50Mn50 as the barrier. ‘Pseudo-spin-valve’ Josephson junctions were also created using a Co/Cu/Fe20Ni80 barrier. In this case the …
-
Effects of transition metal doping on multiferroic ordering in ni3v2o8 and fevo4
<p>We have studied the effects of doping both non-magnetic and magnetic ions on the phase transitions and multiferroic ordering in two multiferroic oxides; Ni3V2O8 and FeVO4. Magnetic, dielectric, specific heat, polarization and AC susceptibility measurements were used to track changes in phase …
-
Relationship between photospheric magnetic fields and coronal activities
… known to be related to the evolution of surface magnetic fields. This dissertation studies the evolution of photospheric magnetic fields and flow fields and their relation to the properties of these two coronal emission components. The key issue in the study of the steady coronal emission is the …
Page 1 of 3