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 60 for “"magnetic ordering"”.
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Magnetic ordering in systems of reduced dimensionality
The magnetic behaviour of thin films of (111) FCC structures and (0001) corundum structured materials were studied by the mean field analysis and some Monte Carlo simulation. These models were conditioned on a mapping from first principles calculations to the Ising model. The effect of the …
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Competition and unification of Kondo coherence and magnetic ordering
… is a quantum critical point separating a non-magnetic heavy fermi liquid metal from an antiferromagnetically ordered metal. The major problem facing us is the fact that, based on new experiments, these two phases seem to collapse simultaneously at the quantum critical point, giving rise to a …
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Magnetic ordering and spin wave dynamics in transition metal arsenides
… spintronic device. Arsenic forms a large pool of magnetic metals in combination with transition metal atoms. In this report, we explore compounds in Cu-Mn-As phase space by identifying the transition temperatures using calorimetry and magnetometry measurements, understanding the magnetic structure …
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A powder neutron scattering study of magnetism in potassium copper trifluoride as a function of hydrostatic pressure
… scattering pressure studies investigating the magnetic ordering of KCuF3 under hydrostatic pressure. Recent studies have predicted the magnetic ordering to be modified at P ~ 7 kbar due to a glassy structural transition. Single crystal studies by Alexander Thaler of the MacDougall lab indicated …
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Molecular-based magnets constructed from cyanometalate building blocks
… 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 oxidation states …
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Growth and magnetoelastic behavior of b-axis-oriented dysprosium
… largest known magnetostrictions, so that their magnetic properties and structural properties are strongly coupled. This coupling is ideally suited for investigation with thin films, in which single crystal films of high quality can be prepared on substrates which cause their lattice parameters …
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Magnetism in Two-Dimensional van der Waals Materials
… to measure and electrically control the magnetic ordering of ultrathin CrI3. I also present a new approach to probe the layer-dependent magnetic ordering by electron tunneling through van der Waals spin-filter magnetic tunnel junctions, where a few-layer crystal of CrX3 serves as the …
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Structural, magnetic and electric transport properties of metal substituted La₀.₇Sr₀.₃MnO₃
"In order to understand the structural related magnetic and transport properties of substituted perovskites La₀.₇Sr₀.₃MnO₃ (LSMO), we studied th effects of replacing some of the Mn with Ti, Zr, and Cu atoms. The structural, magnetic and electrical phase transitions and transport properties of these …
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Neutron scattering and thermodynamic studies of quantum magnetism on the kagomé lattice
… of the kagome lattice leads to exciting novel magnetic behavior in both ferromagnetic and antiferromagnetic systems. The collective spin dynamics were investigated in a variety of magnetic materials featuring spin-1/2 and spin-1 moments on kagome lattices using neutron scattering and …
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High-pressure and high-temperature structural and electronic properties of (Mg,Fe)O and FeO
… previously thought. It was discovered that the magnetic ordering (Néel) transition does not coincide with the structural cubic-to-trigonal symmetry breaking transition in non-stoichiometric FeO. The magnetic ordering transition was determined for the first time by a combined Mössbauer …
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Study of growing incongruent antiferromagnetic single crystals and characterization
… partial switching of the Néel vector of antiferromagnetic CuMnAs and Mn2Au with current-induced spin-orbit torques. More intermetallic antiferromagnets share the structure types of CuMnAs and Mn2Au, or at least contain degenerated in-plane magnetic configurations, are proposed as candidates for …
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Phase diagram for the S equals one-half and J equals three-halves Kondo lattice model
… phase is represented by finite hybridization. Magnetic ordering is examined via ordering vectors, but coexistence with the Kondo phase is not allowed. Phase diagrams are produced in S=1/2 and J=3/2 with second-order transitions at Kondo-paramagnetic and magnetic-paramagnetic boundaries, and …
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Magnetic super-exchange with ultra cold atoms in spin dependent optical lattices
… full phase space of the Heisenberg model and see magnetic super exchange-driven magnetic ordering in a variety of lattice geometries. The aim of this thesis is primarily to explore some of the tools that may be needed accomplish this task.
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Analysis of far-infrared optical spectra of multiferroics
… retarders is included in this dissertation. Ferrimagnetic Dy_3Fe_5O_{12} single crystals are studied in the spectral range between 12 and 700 cm^{-1}, and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry (RAE). It is found that in …
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Synergistic Properties-Driven Synthesis of Aluminides, Antiomonides, and Bioceramics
… elucidation and accurate measurements of their magnetic and electrical properties. The relationship between the complex crystal structures and magnetic properties are reported for LnCo2Al8 (Ln = La-Nd, Sm, Yb), CeCo2-xMnxAl8 (0 < x < 1), and Pr2Fe4-xCoxSb5 (1 ≤ x < 3). The discovery of magnetic …
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Probing nano-scale atomic and electronic structures of iron-based superconductors
… symmetry, coexistence of superconducting and magnetic ordering, and emergence of superconductivity by isovalent doping. The iron-based high-Tc superconductors belong to the structure families of chalcogenides and pnictides. Crystal structures and bonding have large effects on superconductivity …
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Interaction between ferric hydroxides and dissolved sulfide in anoxic aquifers: Pathway and kinetics of iron and sulfur products formation
… of iron polysulfide may influence the electromagnetic properties of ferrous iron in FeS/mackinawite, leading to an occurrence of magnetic ordering at 4.2 K. The magnetic ordering is represented by an asymmetric six-line in the Mössbauer spectrum (at 4.2 K). The spectrum of mixed iron sulfide …
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Synthesis, structure, and magnetic properties of extended 2-D triangular lattices
… which we fully characterize the structure and magnetic properties. Iron jarosites show signature spin frustrated behavior, indicated by a large Curie-Weiss constant, [theta] [approx.] -800 K, with a transition temperature, ... narrowly ranging from 56 - 65 K. Long-range antiferromagnetic order …
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Search for valence transitions in MgEu alloys
… transitions, the study not only encompassed the magnetic and electronic characterization of this system but also the elastic, crystallographic, thermal, transport, metallurgical and phase properties as well.</p> <p>This experimental study revealed three significant features of the MgEu …
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Quantitative study on current-induced effects in an antiferromagnetic insulator/Pt bilayer film
Electrical control and detection of magnetic ordering inside antiferromagnets have attracted considerable interests, for making next generation of magnetic random access memory with advantages in speed and density. However, a full understanding of the recent prototypical spinorbit torque …
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