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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 369 for “"magnets"”.
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Geometrically frustrated quantum magnets
(cont.) more general lessons on frustrated quantum magnetism. At the end, we demonstrate some new mathematical tools on two other frustrated two-dimensional systems, and summarize our conclusions, with an outlook to remaining open problems.
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Two dimensional Langmuir-Blodgett magnets
The susceptibility of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field …
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Doping Studies of Frustrated Magnets
… of investigating the properties of frustrated magnets. LiCuSbO4 is one of the simplest quasi-one dimensional spin-1/2 magnets which can be modelled with ferromagnetic(FM) nearest neighbour and antiferromagnetic (AFM) next nearest neighbour interactions. Here, doping with both non-magnetic ions, …
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Interactions between polyhedral permanent magnets
… and electric motor vehicles, permanent magnets are seeing more widespread use than ever before. They permeate our world, enabling sound generation through loudspeakers, mass data storage in the server farms keeping us online, and even the vibration motors in our pockets notifying us of …
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Quantum phase transitions in disordered magnets
… on quantum phase transitions in disordered magnets. The presence of disorder in the system can lead to a variety of exotic phenomena, e.g., the smearing of transitions or quantum Griffiths singularities. Phase transitions are smeared if individual spatial regions can order independently of …
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New routes to single molecule magnets
Structural and magnetic studies of citrate coordination clusters are presented for reaction systems involving cobalt(II), copper(II) and nickel(II). The cobalt(II) compounds incorporate cubane structural motifs that are of particular interest for the generation of single molecule magnet (SMM) …
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Molecule-Based Magnets Constructed From Hexacyanometalates
Improved preparations are given for several first-row transition metal trifluoromethanesulfonate (OTf) and p-toluenesulfonate (OTs) salts: M(OTf)x, where M = VII, VIII, CrII, MnII, CoII, NiII , and Cs, and [M(OH2)n][OTs]x, where M = TiIII, VIII, VIVO, Cr II, CrIII, MnII, FeII, CoII, NiII, and Cs. …
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Magnetization dynamics of single molecule magnets
Made available in DSpace on 2014-09-16T17:25:53Z (GMT). No. of bitstreams: 2 Yun_Liu.pdf: 2936489 bytes, checksum: 870b4bdf8c282c749cf14f4925088600 (MD5) license.txt: 4056 bytes, checksum: c0d6bd6324ecaf18c5d2647589f9beff (MD5)
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Monofilament MgB₂ wires for MRI magnets
MRI magnets are useful medical devices in early detection and efficient treatment of disease or injury. Because of the significant better performance, MRI magnets are made of superconductors rather than made of copper. Nowadays, there are over 20,000 superconducting MRI magnets installed worldwide. …
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Magnetic Properties of Molecular and Nanoscale Magnets
… and magnetic properties of nano- and molecular magnets and the interplay between these properties reveals new interesting effects and suggests ways to control and optimize the respective material. The main task of this thesis is investigating the magnetic properties of molecular magnetic …
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The computer simulation of quenching in superconducting magnets
… of the large amount of energy stored by such magnets. Since a magnet may be damaged by a quench, it is important to predict the behaviour of a design in this situation. However, the process involves a complex interaction of electromagnetic and thermal phenomena, so a computer-based simulation …
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Ligand Design for Dual Property Single Molecule Magnets
… for the assembly of emissive single molecule magnets, and secondly the preparation and coordination of a chiral mpmH ligand with selected 3d transition metal ions, working towards the discovery of chiral polynuclear clusters. In Project 1, the coordination chemistry of the TBC4 macrocycle …
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Molecular-based magnets constructed from cyanometalate building blocks
… for the preparation of molecular-based magnets with high magnetic ordering temperatures: they can be easily prepared from well-characterized cyanometalate building blocks, the metal centers are linked covalently into a 3D network, and a wide range of metals with different spin states and …
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Impact of vibration-induced disturbances on superconducting magnets
… the interaction between the superconducting magnets (SCMs) and the discrete ground coils causes electromagnetic and mechanical vibrations. These disturbances limit the performance of the maglev, as occurred in the Japanese MLU002 maglev. Here I examine how the electromagnetic oscillations are …
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Flux Pumping for High-Tc Superconducting (HTS) Magnets
… technology which can be used to operate HTS magnets without significant loss. In this decade, several HTS flux pumps based on travelling magnetic waves have been developed, yet their physics is still unclear. This thesis established a framework in the area of flux pumping for HTS coils. It …
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HTS Magnets: Modelling, Charging and Large Scale Applications
… engineering application areas such as high-field magnets for medical imaging and nuclear fusion. Despite the promise, the low industrial maturity of HTS has limited their adoption. In addition, cooling them to cryogenic levels requires careful design considerations. This thesis addresses these …
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Exotic phenomena in rare-earth based geometrically frustrated magnets
Rare-earth (RE) based frustrated magnets are ideal systems to explore quantum effects in materials, which are paramount for the development of quantum computers, MRAM, and other next-generation technology. RE based materials are of specific interest due to the strong spin-orbit coupling and crystal …
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Optics and Optoelectronics of Atomically Thin Magnets and Semiconductors
Since the discovery of graphene, layered van der Waals materials have become one of the most active subjects of study. The array of available atomically thin materials has expanded rapidly beyond graphene, encompassing a wide variety of physical properties ranging from insulators like hexagonal …
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Isotropic nanocrystalline (Nd,Pr)(Fe,Co)B permanent magnets
Nanokristalline Permanentmagnete zeigen ungewöhnliche magnetische Eigenschaften aufgrund von Oberflächen- und Grenzflächeneffekten, die verschieden von denen massiver oder mikrokristalliner Materialien sind. Diese Arbeit zeigt Ergebnisse einer systematischen Untersuchung der Beziehung zwischen …
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