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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 45 for “"Magnetic systems"”.
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Solitons in Magnetic Systems
… focus on the dynamics of solitary waves in such systems in conditions of broken integrability and with reference to the formal and physical analogies between BEC mixtures and the classical magnetization dynamics of solid-state ferromagnets. Chapter 2 introduces the physical systems under …
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Controllable magnetic systems for minimally invasive surgery
… design and development of a controllable electromagnetic compression medical device that addresses the need for control of magnetic attraction in the clinical setting. This work outlines the design of a magnetic medical device to be used for anchoring or compression, namely by shaping the …
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Magnetic Characterisation of Nanostructured Magnetic Systems Using SQUID Magnetometry
… 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 nanoparticles (MNPs), a family of lanthanide ionic …
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Theoretical studies of stray field images of magnetic systems
Research in magnetic recording is currently at a stage where an understanding of the magnetic microstructure of recording media is vitai for the continual improvement in recording performance and the achievement of higher recording densities. Experimental techniques such as Lorentz Imaging and …
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Strain control of advanced magnetic systems for spintronic applications
Application of strain to magnetic systems offers the promise of a novel, low energy cost method of manipulating magnetic behaviour. However, many possibilities remain unexplored when it comes to its application to more advanced magnetic systems. Much of the experimental work in this area, focused …
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Application of renormalization-group techniques to random magnetic systems
… been applied in the study of quenched random magnetic systems in recent years. We begin with a brief review of second-order phase transitions in pure, homogeneous systems and also of the .. renorma1ization group framework. Then we provide an introduction to quenched random magnetic systems. …
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Characterization of quantum correlations in low-dimensional molecular magnetic systems
Progressos recentes em informação quântica têm demonstrado nossa capacidade de detectar e controlar as propriedades quânticas em materiais magnéticos moleculares. Nos últimos anos, foi demonstrado que estes materiais possuem correlações quânticas altamente estáveis contra perturbações externas como …
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Magnetic surface relaxation and reconstruction phenomena in frustrated magnetic systems
… magnetism on face-centred cubic (FCC) lattice systems. Normally, magnets do not react to a surface. Frustrated magnets do, however, and we consider two cases: Magnetic relaxation and the more unusual magnetic reconstruction phenomenon. Magnetic relaxation involves the extinction near the …
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Emergent Critical Phases in Strongly Correlated Low-Dimensional Magnetic Systems
… and highly fertile collection of van der Waals magnetic insulators known as transition metal phosphorous trichalcogenides, denoted as *TM*P*X*<sub>3</sub> (*TM* = Mn, Fe, Ni, *X* = S, Se). These compounds have proven to be ideal examples where structural, magnetic and electronic properties …
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Optical studies of current-induced spin-orbit effects in magnetic systems
Efficient electrical control of magnetic moments is essential for future spintronics applications, in which the intrinsic spin of the electron is utilized in addition to the electron charge for data processing and storage. Spin-orbit-interaction-induced phenomena, including the spin Hall effect, …
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Dynamics of frustrated magnetic systems – Emergent fractals and anomalous magnetic noise in spin ice
Typical thermodynamic systems have a small number of minimum-energy ground states into which the system strives to arrange itself when the temperature is sufficiently low. In some cases, however, competition between interactions leads to the suppression of conventional long-ranged magnetic …
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Renormalization-group studies of disordered magnetic systems, strongly correlated electonic systems, and polymeric systems
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems
… spin-dependent and dynamical properties of thin magnetic systems. Photoemission-related techniques are combined with synchrotron radiation to study the spin-dependent properties of these systems in the energy and time domains. In the first part of this thesis, the strength of electron correlation …
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Study of Magnetization Switching for MRAM Based Memory Technologies
… new nonvolatile data storage solutions as magnetic random access memories - MRAMs. This dissertation is intended to provide a theoretical analysis of static and dynamic magnetization switching of magnetic systems within the framework of critical curve (CC). Based on the time scale involved, …
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Fabrication and Characterization of Three-Dimensional Magnetic Nanostructures
Today, two-dimensional nanoscale magnetic systems are well understood, being used in applications from spintronic circuits to automotive sensing. Despite the great progress achieved in the field during the last decades, the development of three-dimensional devices is still hindered by phenomenal …
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Phase transitions in magnetic clusters and other finite systems
… seven articles dealing with phase transitions of magnetic clusters or other finite systems. We show that phase transitions in finite systems, which can be experimentally seen only in floppy humps of the specific heat or the magnetic susceptibility, can be quantitatively described by an analysis of …
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Topics in transport phenomena near the critical point
… for longitudinal sound waves near the magnetic transition. The rise in the electrical conductivity as a material approaches its superconducting transition is described. Near T c small regions become superconducting and can carry an anomalous current, thereby causing a rise in …
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Nanopartículas magnéticas adsorvidas em superfícies metálicas
Understand the physical properties of magnetic systems adsorbed in metallic surfaces is quite important for technological and scientific reasons. Here, this kind of system is studied theoretically by first principles calculations, based on the density functional theory (DFT), as well as by tight …
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… the strong spin-orbit interaction (SOI) in the systems gives us means by which we can manipulate the quantum-mechanical spin of these electrons through the orbital properties of the electrons. This enables the observation of spin-dependent phenomena otherwise inaccessible in non-magnetic …
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