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 31 for “"Spin Waves"”.
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Spin waves in doped graphene
Spin-waves have been studied to a great extent in solids and two-dimensional electron gases. These phenomena have garnered much interest in developing new kinds of devices for information processing and transmission. A major feature of these devices is that they would consume much less power than …
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SPIN WAVES AND PHASE TRANSITIONS IN FERROMAGNETIC SUPERLATTICES
… techniques such as sputtering and epitaxy, spin excitations in magnetic superlattices have been the subject of increasing interest in recent years. Much of this work is motivated by a desire to achieve technically useful characteristics, such as man-tailored superlattice materials, surface …
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Quantization of spin waves in ferromagnetic Ni80Fe20 nanoring
… using deep ultraviolet lithography and their spin dynamicsmeasured by Brillouin light scattering with the magnetic field applied along long (easy) axes of the rings. The dispersionless behavior of the spin wave modes observed reveals their standing wave nature. Two-dimensional simulations and …
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Nonlinear spin waves in magnetic thin films - foldover, dispersive shock waves, and spin pumping
Three nonlinear phenomena of spin waves and the spin Seebeck effect in yttrium iron garnet (YIG)/Pt bi-layer structures are studied in this thesis and are reported in detail in Chapters 4-7. In the fourth chapter, the first observation of foldover effect of nonlinear eigenmodes in feedback ring …
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Spin wave characterization in a 1D YIG magnonic crystal
… thesis, I will analyze and discuss features of spin wave propagation characteristics measured in a one-dimensional (1D) yttrium iron garnet (YIG) magnonic crystal using time-resolved Brillouin light scattering (TR-BLS) measurements. Magnonic crystals are a promising candidate to aid in …
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Percolation phenomena in amorphous iron-nickel alloys
… Various parameters describing the excitation of spin waves were extracted from the magnetization data. There has been a great deal of theoretical work on the problem of spin waves in dilute magnets. The data are consistent with current models based on a fractal description of the infinite cluster.
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Domain Wall Based Magnonics in Iron Garnet
Magnonic devices leverage magnons, quantized spin waves, as the mechanism to process and transfer information. In materials with low Gilbert damping, these spin wave-based systems enable ultra-fast operation while eliminating thermal heating and leakage currents inherent to conventional …
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Taking Steps Towards Superfluid-like Spin Transport in Metallic Ferromagnets
… of electrons. Recent works in the field of spintronics have focused on using magnetic excitations (e.g., spin waves) instead of electrons as a means of information transport without Joule heating. However, realizing long distance information transport using conventional spin waves has proven …
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Manipulation of spin textures by unconventional spin torques
… high-performance, low-power solid-state spintronic devices. The manipulation of nonuniform 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 …
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Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices
… substrates achieve ultralow Gilbert damping of spin waves ([alpha] = 2.2-7 x 10-4 ), which enable em-long in-plane propagation of spin waves. This demonstration enables researchers to fabricate near-dissipationless magnon-based logic computers. Finally, we present a substitutionally-doped …
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… optical techniques have been developed to study spin wave generation in large area patterned thin films and the interaction of different modes. The study revealed the influence of pattern geometry on the spin wave modes and their interference patterns at different distances. Additionally, MAMR …
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Brillouin scattering investigation of nanomagnetic structures
… bulk magnon quantization in Ni nanowires: bulk spin wave quantization has been observed, and the magnon frequencies are found to decrease with increasing wire diameter. (2) investigation into the magnetic interaction between FeCo nanowires in closely-packed arrays: conclusive evidence of …
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Point contact studies of rare earth-transition metal compounds
… contact techniques have been used to study the spin-dependent properties of rare earth-transition metal compounds and transition metal thin films and bi-layers. The transport spin polarisation of Cu, Co and Fe has been measured using point contact Andreev reflection (PCAR), and found to be in …
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The ground state of the spin-1/2 kagomé lattice antiferromagnet : neutron scattering studies of the zinc-paratacamite mineral family
… the nature of the ground state of the spin-1 2 kagomé lattice antiferromagnet, as such a system is considered ideal for the emergence of spin liquid physics. Clinoatacamite, a distorted kagomé lattice antiferromagnet with weak inter-plane coupling, undergoes a Néel or- dering transition …
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Magnetic Excitations in Cylindrical Multilayered Nanostructures
… experimental studies, have motivated a theory of spin waves (SW) in ferromagnetic and antiferromagnetic cylindrical systems. The calculations are applied to situations where the external magnetic field is parallel to the cylindrical axis and the structures have a large length-to-diameter aspect …
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Raman scattering in heavy rare earth metals
… ferromagnetic phase. The ferromagnetic acoustic spin wave gap in Dy was observed. To our knowledge this is the first observation of a metallic spin wave by Raman scattering. The light scattering measurement of the spin wave gap energy agrees with and corroborates earlier infrared resonance …
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Magnetic Weyl Semimetals for Spintronic Applications
… of topological materials that hold promise for spintronic applications due to their unconventional transport properties, which arise from both bulk and surface topological states, as well as the rich interplay between band topology and magnetism. Among the family of semimetallic materials, the …
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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
Spintronics utilizes the intrinsic spin of electrons to design next-generation electronic devices, reducing power consumption and enabling innovative computing functions. Over the past decades, significant research interest has been directed toward two types of spin-based systems: collective …
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Polyoxometalates and Block Copolymers: Templated Self-Assembly for Nanomaterials Applications
… magnetic materials that are able to propagate spin waves, and are potential candidates for the next generation of computing. The research presented in this thesis explores templated self-assembly to create polyoxometalate (POM) assemblies in the theme of magnonic crystals. Initially, a …
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Generalized phononic networks : of length scales, symmetry breaking and (non) locality : "controlling complexity through simplicity"
… allows extension to other vector and scalar waves, such as photonic, plasmonic and magnonic structures and provides a promising route forward to the development of integrated structured material platforms that allow for the rational manipulation and interactions of phonons with other waves, …
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