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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 21 for “"SQUID magnetometry"”.
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Magnetic Characterisation of Nanostructured Magnetic Systems Using SQUID Magnetometry
In this thesis SQUID magnetometry was employed as the main characterisation tool to investigate the magnetic behaviour of a number of materials on the bulk, nano- and atomic scale. In particular magnetic characterization was conducted on a selection of doped lanthanum manganate (LMO)magnetic …
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Novel magnetic behavior in heavy rare earth superlattices
… behavior is explored by neutron diffraction and SQUID magnetometry experiments.
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Explaining a Low-Temperature Magnetic Order in Annealed van der Waals Semiconductor CrSBr
… in annealed CrSBr bulk single crystals using SQUID magnetometry. The order manifests as a broad bump centered at 75 K in magnetization measurements. We deduce that the order is the magnetic contribution of secondary phases, which we image and identify via SEM-EDS analysis. We determine that …
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Synthesis and Investigation of Nanomaterials by Homogeneous Nonaqueous Solution Phase Reactions
… with different crystal lattices from Fe and Au. SQUID magnetometry reveals that particle magnetic properties are not significantly affected by the overlayer of a moderately thick Au shell. The Aucoated particles exhibit a surface plasmon resonance peak that red-shifts from 520 to 680 nm. And Poly …
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The Synthesis of Core-Shell Iron@Gold Nanoparticles and Their Characterization
… EDS (Energy disperse X-ray spectroscopy), SQUID (Superconducting Quantum Interference Device), TGA (Thermograviometric analysis), UV-visible absorption spectroscopy and Faraday rotation were employed to characterize the morphology, structure, composition and magnetic properties of the …
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Synthesis and Properties of New Oxychalcogenide Materials
… collections and analysis of this work is given. SQUID magnetometry is also discussed. Chapter 3 discusses the variable temperature structural and magnetic properties of La2O2Mn2OSe2 and Pr2O2Mn2OSe2, as well as those of the newly prepared material Ce2O2Mn2OSe2. These materials are observed to …
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Sustainable Heusler and Antiferromagnetic Thin Films for High Density Data Storage
… L$2$_1$ order verified by X-ray diffraction. SQUID magnetometry and X-ray magnetic dichroism have been utilized and show deviations from their predicted magnetic properties, which could possibly diminish their predicted half-metallic properties. In the second part of this thesis, the use of …
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Mikroskopischer Ursprung der Austauschkopplung in ferromagnetischen, antiferromagnetischen Schichten
… light scattering, molecular beam epitaxy, and SQUID-magnetometry are presented. The influence of non-magnetic defects in the antiferromagnet ("Dilution of the antiferromagnet") on the exchange bias field is investigated in the systems Co/Co1-yO and Co/Co1-xMgxO. In both cases an increase of the …
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Structural and electronic properties of fulleride superconductors
… powder diffraction and magnetic behaviour using SQUID magnetometry techniques.
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Preparation of high purity doped oxides for fundamental studies
… with x-ray diffraction, electron microscopy, and SQUID magnetometry. The particle size was observed to increase with increasing calcination temperature and a correlation between the particle size and formation of NiO was noted. In particular, NiO is absent as a second phase in the finer particle …
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Sintesi e caratterizzazione di nanocompositi aerogel altamente porosi per applicazioni catalitiche
… spectroscopy (XAS), Mössbauer spectroscopy and SQUID magnetometry. These nanocomposites, thanks to their high porosity, low density and high area surface, were tested as catalysts in important industrial processes such as the synthesis of Carbon Nanotubes via Catalytic Chemical Vapour Deposition …
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Thermal, Magnetic, and Electrical Properties of Thin Films and Nanostructures: From Magnetic Insulators to Organic Thermoelectrics
… of trapped-flux induced artifacts in SQUID magnetometry of large paramagnetic substrates allows for the resolution of increasingly small moments. Using these methods, the antiferromagnetic coupling of the interface between a Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> film and …
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Polyoxometalates and Block Copolymers: Templated Self-Assembly for Nanomaterials Applications
… Super conducting quantum interference device (SQUID) magnetometry data presents POMs with antiferro- and ferromagnetic exchange interactions, while electron paramagnetic spectroscopy provides information into the electronic structures of POMs. The feasibility of templating POMs with block …
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Pyrochlore spin ice Dy2Ti2O7: Investigating a platform for magnetic monopolar quasiparticles
… a supeconducting quantum interference device (""SQUID"")-based magnetometer in a dilution refrigerator was used to search for signatures of monopole excitations in spin ice. From this work, structural, thermal, and magnetic trends were measured in spin ice crystals grown under varying oxygen …
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Synthesis and investigation of hexacarboxamide cryptands as anionic binucleating ligands by Glen E. Alliger.
… characterized by a variety of methods, including SQuID magnetometry, cyclic voltammetry, EPR, and, in the case of the diiron complex, Mbssbauer spectroscopy. Also reported is work toward a diiron(III) complex; the M6ssbauer spectrum of this species is reported. In analogy to the pt-cyano complex …
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Nanomagnetismus von epitaktischen Fe(110)- und CrO 2 (100)-Strukturen im Hinblick auf potentielle spinelektronische Anwendungen
… atomic force and scanning tunneling microscopy, SQUID magnetometry, magnetooptical Kerr measurements, and spin resolved photoelectron spectroscopy, the surface roughness of the films has been drastically reduced. It is shown that the so prepared films exhibit a high spin polarization and a …
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Borate polyanion-based systems as Li- and Mg-ion cathode materials
… state changes in Mn have been investigated by SQUID magnetometry and XANES spectroscopy. Electrochemical studies in materials where M = Fe, Co, and Ni show high voltage plateaus (> 3.5 V) but limited capacity at room temperature. Increased temperatures improves cycling, with Co and Fe based …
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Bio-inspired iron and cobalt complexes featuring a secondary coordination sphere: ligand design, complexation, and modeling of enzymatic processes
… low-spin by EPR spectroscopy, but high-spin by SQUID magnetometry. It was also found that a cobalt complex could activate O2 to form a terminal cobalt(III)-hydroxo.
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Mycobacterium tuberculosis metallomics
… superconducting quantum interference device (SQUID) magnetometry, zeta potential analysis, and inductively coupled plasma mass spectrometry (ICP-MS). The antimycobacterial efficacy of SPIONs and metal-coated SPIONs was evaluated against Mycobacterium smegmatis (Msmeg) and Mtb using time–kill …
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