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 “"Magnons"”.
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Giant Magnons and Giant Gravitons
… by constructing the full set of boundary giant magnons on $\mathbb{R}\times S^{2}$ attached to the maximal $Z=0$ giant graviton by mapping from the general solution to static sine-Gordon theory on the interval. We then compute the values of the anomalous dimension, $\Delta-J$, of the dual gauge …
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Strong coupling between microwave photons and nanomagnet magnons
Coupled microwave photon-magnon hybrid systems offer promising applications by harnessing various magnon physics. At present, in order to realize high coupling strength between the two subsystems, bulky ferromagnetic insulators with large spin numbers are utilized, which limit their potential …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… TG approach has been exploited to drive coherent magnons at a selected wavevector non-relying on the magnetoelastic coupling but rather on the spatially modulated temperature profile generated by the TG excitation mechanism itself. The approach was successfully tested on ferrimagnetic Co78Gd22 …
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Brillouin scattering from single-crystal dysprosium and gadolinium films
… Dy films and longwavelength acoustic magnons in single-crystal Gd filins. The spectra were analyzed by using elastic and magnetic continuum models for the Dy and Gd systems, respectively. The room temperature dispersion and the temperature dependence of the velocities of surface and …
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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
… excitations of spins, known as spin waves or magnons, in magnetic materials, and optically active spin defects as represented by nitrogen-vacancy (NV) centers in diamond, leading to the prosperity of magnonics, quantum sensing, and quantum information processing. As the understanding of …
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Brillouin scattering from single-crystal dysprosium and gadolinium films
… Dy films and long-wavelength acoustic magnons in single-crystal Gd films. The spectra were analyzed by using elastic and magnetic continuum models for the Dy and Gd systems, respectively.
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Unidirectional Magnetoresistive Behaviors: Materials, Characterization, and Prospects
… contributions including electron accumulation, magnons, spin momentum locking, and spin-orbit torque. This dissertation studied the unidirectional magnetoresistive behaviors, including USMR, UMR, and BMER, from several aspects: physics, materials, characterization, and applications. A universal …
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Magnon Transport in Insulating Magnetic Thin Films
… opens up the possibility of transportation of magnons in the low energy multi-domain state without the need for external magnetic fields.
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Novel Phenomena Induced by Magnon-Magnon and Magnon-Spin Coupling
… chiral dipolar interaction between propagating magnons generates bulk bands with non-zero Chern integers and magnonic surface states carrying chiral spin currents. The surface states are highly localized and can be easily toggled between non-trivial and trivial phases through an external …
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Ultrafast laser driven spin generation in metallic ferromagnets
… is due to energy transport between electrons and magnons of FM and conservation of angular momentum for electron-magnon coupling. Ultrafast laser light deposits its energy in electrons of metallic layers and leads to a sharp increase of the electron temperature. The excited electrons transport …
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Thermal transport in two-dimensional materials and magnetic multilayers
… parameters between electrons, phonons, and magnons, by using time-resolved quadratic and linear magneto-optical Kerr effects (TR-QMOKE and TR-MOKE, respectively) on 10-nm-thick and sub-nm-thick Co layers, respectively. Then I use sub-nm-thick Co layers embedded in much thicker Pt layers to …
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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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Synchrotron radiation-based characterization of GaN- based MQW structures and strongly correlated materials
… is proposed that the proximity in energy between magnons and Ho^{3+} ligand fields (LF) might connect the magnetism and dielectric properties of this compound through coupling with the Mn spin structure.
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Harnessing Magnetic Switching and Dynamics Using Electron and Magnon Spin Currents
… currents, as carried by conduction electrons and magnons, respectively, to realize efficient magnetic switching and transmission of dynamical spin signals. Using electron spin current, we firstly demonstrated current-induced magnetic switching via the strong spin-orbit torque from topological …
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Hybrid Magnonics in Antiferromagnets and Cavity Spintronic Devices
… tasks in both classical and quantum domains. Magnons, the collective spin wave excitations in magnetically ordered materials, have recently attracted great attention for realizing hybrid dynamic systems. In this thesis, we develop hybrid magnonic systems with reduced complexity, improved …
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Controlling and probing nonlinear collective mode dynamics in quantum materials
… vibrations (phonons) and spin precessions (magnons)—to large amplitudes opens fundamentally new pathways for controlling and probing material properties that are otherwise inaccessible under thermal equilibrium conditions. In this regime, both the nonlinear interactions between light and …
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Quantum critical matter: Casimir pairing, emergent orders and topological defects
… becomes screened by the cloud of critical magnons and we calculate the distribution of a magnetization in the cloud. Our results show that adding a small concentration of impurities can significantly affect critical properties of the system. Next, we perform a phenomenological study of …
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Neutron Scattering Studies of Unusual Spin Structure and Local Correlation in Complex Oxides
… an anomalous softening and broadening of the magnons near the zone boundary, where a longitudinal optical phonon is present, indicating that magnon-phonon coupling could play a critical role in the behavior of the spin wave dispersion of these systems. The work presented in this thesis should …
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Ultrafast Terahertz Spectroscopy of Collective Excitations in Correlated Materials
… in magnetite, the interplay between excitons and magnons in the van derWaals antiferromagnet NiPS₃, the crossover between distinct optical generation mechanisms of a coherent magnon in NiPS₃, and the dynamics of coherent electromagnons in the van der Waals multiferroic NiI₂.
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THz polaritonics : control, confinement, and strong light-matter interactions
… in the strong coupling regime, where phonons and magnons where strongly coupled to the electric and magnetic fields of THz light, respectively. Our experiments, performed in both waveguide and cavity geometries, conclusively proved the formation of new quasiparticles we termed …
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