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Showing 1 to 20 of 91 for “"ferromagnetism"”.
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Ferromagnetism and transport in diluted magnetic semiconductors
This dissertation focuses on the study of ferromagnetism in Dilute Magnetic Semiconductors. To study these strongly correlated electronic systems, two non- perturbative techniques are used: the Dynamical Mean Field Approximation (DMFA) and the Dynamical Cluster Approximation (DCA). The model used …
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The possibility of ferromagnetism in the liquid state
… calculated in order to study the possibility of ferromagnetism in the liquid state. A model which was proposed by Honda and Kato is used. The calculations are trade in the mean field approximation. Some terms in the Hamiltonian of the system which were neglected by Honda and Kato are shown to be …
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Investigation of half-metallic ferromagnetism in NiMnSb spin dependent tunnel junctions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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MAGNETIC PROPERTIES OF NICKEL - RHODIUM ALLOYS NEAR THE CRITICAL-COMPOSITION FOR FERROMAGNETISM.
… RHODIUM ALLOYS NEAR THE CRITICAL-COMPOSITION FOR FERROMAGNETISM.
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Antiferromagnetism, ferromagnetism and magnetic phase separation in Bi₂Sr₂O₆â[delta]
Neutron scattering, magnetization and transport measurements were performed on single crystals of Bi2Sr2CoO6+[delta] to study the evolution of the magnetic properties as a function of the oxygen content . The oxygen content was varied by annealing single crystals in either a reducing or oxidizing …
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The study of weak ferromagnetism by andreev reflection spin spectroscopy and development of bimorph electro-thermal actuators
… of various materials, generally with low ferromagnetism, were extracted in order to understand the transport properties of spin polarized current and find the relation of spin polarization with other parameters such as saturation magnetization or the Curie temperature so that better …
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Transition metal implanted ZnO: a correlation between structure and magnetism
Nowadays ferromagnetism is often found in potential diluted magnetic semiconductor systems. However, many authors question the origin of this ferromagnetism, i.e. if the observed ferromagnetism stems from ferromagnetic precipitates rather than from carriermediated magnetic coupling of ionic …
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Effect of nonstoichiometry on the magnetism and ferroelectricity of Fe- and Co-substituted strontium titanate thin films
… devices and multi-state memory. Room temperature ferromagnetism and ferroelectricity are of great interest to the multiferroic and magnetoelectric community, as a key challenge in the field is engineering a material exhibiting room temperature ferroelectricity and ferromagnetism. Pulsed laser …
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Ferromagnetism of novel ultrathin films and multilayers: A study of Ru/C(0001) and Fe/Mn/Fe/Pd(100) using magneto-optic Kerr effect and spin-sensitive electron spectroscopies
The possibility of the existence of ferromagnetic order in Ru monolayers on the C(0001) graphite surface is studied using electron induced spin-polarized secondary electron emission (SPSEE). Below a surface Curie temperature of approximately 250K we find ferromagnetic order of the Ru monolayer. The …
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Investigation of the Magnetic Properties of Non-Thiolated Au Nano-Structures Grown by Laser Ablation
… alloy form, bonded with indium, the samples show ferromagnetism when embedded in an Al2O3 matrix without any thiol-containing organic capping. Our results suggest that ferromagnetism is an intrinsic property of Au nano-structures, which means that it is not necessary to incorporate Au-S bonds with …
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Quantum coherence and magnetism in bosonic and fermionic gases of ultracold atoms
… In the first part of the thesis, itinerant ferromagnetism was studied in a strongly interacting Fermi gas of ultracold atoms. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition …
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Growth and characterisation of Niobium/Gadolinium superconductor-ferromagnet nanocomposites
Superconductivity and ferromagnetism are two antagonistic physical phenomena which their coexistence in a uniform material can be resolved only under extraordinary conditions. The reason for that is the phonon-mediated attraction energy between electrons which results in the formation of the …
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A Study of the Nucleation and Formation of Multi-functional Nanostructures using GaN-Based Materials for Device Applications
… studied for the achievement of room temperature ferromagnetism using TM (transition metal; Mn or Fe). The transition metal (Mn or Fe) enhances nucleation of islands, resulting in size and density improvements. The magnetization measurements revealed magnetic properties of ferromagnetic …
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Disorder and Doping in the Oxygenated Electron-doped Superconductor PCCO
… I investigated the intrinsic nature of the ferromagnetism observed in thin films. Hall effect measurements were used as the technique because ferromagnetic materials exhibit an anomalous Hall effect, which is due to an interaction between the charge carriers and the magnetic moments. I found …
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Interplay between Correlation and Topology in Two-dimensional Systems
… emergent Kondo lattice physics, quantum Hall ferromagnetism, (fractional) quantum anomalous Hall effect, and formation of anomalous Hall crystals. Typically in many of these systems, there is a nearly flat low-energy band with non-zero Berry curvature. This generalizes the familiar quantum …
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Low-Temperature Gas-Phase Nitriding and Nitrocarburizing of 316L Austenitic Stainless Steel
… ranging from 1% to 10%. Room temperature ferromagnetism in expanded austenite in stainless steels was then induced due to the great increase in Fe-Fe interatomic distance. A combined of XRD, MFM and EBSD study revealed that the minimum lattice expansion required for ferromagnetism is ~ 5%. …
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Atom-by-Atom Substitution of Transition Metals in GaAs and Visualization of Hole-Mediated Interactions
The discovery of ferromagnetism in Mn doped InAs and GaAs has ignited interest in the development of semiconductor technologies based on the electron spin. A major hurdle remaining for realistic applications of ferromagnetic semiconductors, such as Ga(1-x)Mn(x)As, is their below room-temperature …
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