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 27 for “"skyrmion"”.
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The Effects of Non-Magnetic and Magnetic Doping on the Skyrmion Hosting Material, Cu2OSeO3
… only insulating multiferroic that hosts magnetic skyrmions, which have been hypothesised as an alternative method to store data. These skyrmions arise from competing Heisenberg exchange and Dzyaloshinskii-Moriya interactions due to the non-centrosymmetric arrangement of the material’s crystal …
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Magnetic Skyrmions in Multilayers with Interfacial Dzyaloshinskii-Moriya Interactions
<p>Magnetic skyrmions, topologically stable spin textures that can be driven by electric currents efficiently, have both rich physics and potential applications in future technology such as spintronic devices for data storage. Magnetic skyrmions in multilayers with interfacial Dzyaloshinskii-Moriya …
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Atomistic Simulations of Antiferromagnetic Solitons and their High-Speed Dynamics
… states called solitons namely Domain Walls and Skyrmions, can be efficiently driven by currents and achieve velocities of several kilometers per second. These solitons are massive particles and therefore cannot travel faster than a limiting velocity akin to the speed of light for the material. …
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Atomistic Study of Traveling Skyrmions in Multi-Sublattice Magnetic Materials
… be encoded by magnetic twisted textures called skyrmions, which can be efficiently driven by applying electrical current. Recently, emphasis has been placed on investigating antiferromagnetic and ferrimagnetic skyrmions, as opposed to the single-sublattice ferromagnetic ones studied earlier, due …
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Topological Structures in Ferroic Materials
… as more complex structures such as vortices and skyrmions, which are spiralling configurations of the order parameter. This thesis investigates topological structures arising in both magnetic and ferroelectric structures, highlighting both the similarities and the differences in these material …
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Soliton interactions and bound states
… new (2 + 1)-dimensional model containing a baby skyrmion coupled to a vector meson. This is an analogue of the (3 + 1)-dimensional Skyrme theory containing a vector meson. We use this lower-dimensional analogue to numerically justify the use of a rational map ansatz in the analysis of the (3 + …
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Nanometer scale observation of magnetization textures induced by ultrashort laser pulses
… topological magnetic solitons called magnetic skyrmions in ferromagnetic multilayer systems. Discovering the mechanisms that drive the laser-induced magnetization effects as well as their speed is not only of fundamental interest, but also relevant for potential spintronic applications. In this …
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Quantum critical matter: Casimir pairing, emergent orders and topological defects
… CDW. Finally, we consider topological defects (skyrmions and merons) in frustrated magnets which are in the vicinity of a phase transition from a collinear to a spiral magnetic state. We show that isolated metastable skyrmions can exist in the absence of an external magnetic field in frustrated …
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Skyrmions -- beyond rigid body quantisation
… are described as topological solitons known as Skyrmions. To make contact with nuclear data one must quantise these Skyrmions; most calculations to date have used rigid body quantisation, where the Skyrmions are allowed to rotate but remain rigid. The method reproduces some experimental results …
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Static and dynamic properties of magnetic Skyrmions in engineered multilayer films
Magnetic textures known as skyrmions promise new breakthroughs in memory, logic, and neuromorphic applications. Skyrmions have been found in a variety of material systems, yet there existed no experimental evidence of a material that could simultaneously host them at room temperature and also allow …
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Optimization of magnetic thin films for generating stable chiral magnetic structures
… of ferrimagnetic and antiferromagnetic films. Skyrmions are topologically protected chiral spin structures that are highly promising candidates for magnetic bits due to their stability and potential for fast motion. These spin structures can be used to encode O's and l's in racetrack memory …
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Large-Scale Atomistic Simulations of Complex and Functional Properties of Ferroic Materials
… electro-optic effects in FE vortices and skyrmions, and voltage amplification via negative capacitance in ferroelectric-paraelectric superlattices. We employ HEff in Monte Carlo and molecular dynamics schemes to maximize spontaneous optical rotation in a BaTiO$_3$/SrTiO$_3$ nanocomposite. …
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Ordering processes and pattern formation in systems far from equilibrium
… relaxation and ordering processes in magnetic skyrmion systems. This is followed by a study of the behavior of many species interacting on a spatially heterogeneous lattice. Magnetic skyrmions have been a subject of great interest in recent years. They have been proposed to be at the heart of …
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Aspects of Moiré Quantum Matter
… itinerant electrons strongly coupled to skyrmion-like magnetic textures, closely connected with moiré transition metal dichalcogenides in which the fractional quantum anomalous Hall effect was observed, can host flat Chern bands, emergent Landau levels, and zero-field non-Abelian …
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Topological phenomena in ultracold atomic gases
… gas. We also study theoretically the dynamics of skyrmion-antiskyrmion pairs in a Bose Einstein condensate. Firstly, we propose a general method by which experiments can map the Berry curvature across the Brillouin zone, and thereby determine the topological properties of the energy bands of …
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Quantum Tuning and Emergent Phases in Charge and Spin Ordered Materials
… and heavy-fermion systems, the appearance of the skyrmion magnetic vortex state in MnSi and magnetically mediated superconductivity in UGe$_2$. While detailed studies of many of the emergent phases have been made, there are still many gaps in understanding of the underlying states and mechanisms …
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Manipulation of spin textures by unconventional spin torques
… magnetization textures such as domain walls and skyrmions provide both a means to control magnetism in devices, and to gain new fundamental insights into spin-charge and spin-orbital interactions in magnetic materials. In this thesis, we examine novel mechanisms for the evolution and control of …
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Dzyaloshinskii-Moriya Interaction and Local Exchange Variation in Rare-Earth Transition-Metal Ferrimagnets
… of chiral spin textures such as domain walls or skyrmions in order to read and write data. Rare-earth (RE) transition-metal (TM) ferrimagnetic heterostructures are especially promising candidates due to their minimal stray fields and vanishing angular momentum near compensation, and have already …
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B=4N Nuclei in the Skyrme Model
… nuclei via topological solitons known as Skyrmions. The B = 4 Skyrmion is of particular importance as its symmetry and stability means that multiple B = 4 Skyrmions can combine with each other to form larger B = 4N Skyrmions. In this thesis we investigate the properties of these B = 4N …
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Magnetic thin films For spintronic memory
… uniformly magnetized regions called domains. Skyrmions are circular magnetic domains with chiral domain walls that are interesting due to their stability and potential for fast motion. These spin structures can be used to encode Os and Is in spintronic memory. Chiral domain walls and skyrmions …
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