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 69 for “"Magnon"”.
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Novel Phenomena Induced by Magnon-Magnon and Magnon-Spin Coupling
Realization of novel topological phases in magnonic band structures represents a new opportunity for the development of spintronics and magnonics with low power consumption. While several approaches have been proposed for generating topological magnonic surface states, they usually require …
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Magnon heat transport and magnon-hole scattering in one and two dimensions spin systems
The magnon thermal conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 …
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Magnon Transport in Insulating Magnetic Thin Films
Magnon-mediated spin flow in magnetically ordered insulators enables long-distance spin-based information transport with low dissipation. MAFO (MgAl0.5Fe1.5O4) is a spinel ferrite that has been recently stabilized in epitaxial thin-film form and has a substantial in-plane four-fold magnetic …
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Magnon and phonon thermal transport in oxides
… I advanced the understanding of the mechanism of magnon and phonon thermal transport in oxides. In these studies, I use ultrafast pump-probe metrology, time-domain thermoreflectance to measure the thermal conductivity. The first subject is the relationship between magnons and phonons in …
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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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Initialisation, control and readout of a nuclear-magnon quantum register
… of a single nuclear-spin excitation -- a nuclear magnon. In this way we readout magnon population in modes distinguished by polarity and nuclear species. This work constitutes a step towards quantum state tomography of nuclear spin-wave superposition states; a valuable tool in the operation of a …
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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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Raman scattering studies of spinels CoV2O4 and MnV2O4
… and lattice degrees of freedom. We find a q = 0 magnon spectrum that differs significantly from spin-wave calculations and analysis of previous inelastic neutron scattering data for MnV2O4. Our high-resolution q = 0 spin-wave excitation results put constraints on spin-wave calculations that …
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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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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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Brillouin scattering investigation of nanomagnetic structures
… projects are reported: (1) observation of 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 …
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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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Nanoscale electron, phonon and spin transport in thermoelectric materials
… and phonons in most semiconductors, and magnons in magnetic materials. These understandings have been achieved through the development of both first-principles simulations and experimental spectroscopic tools, in particular for phonon transport and phonon-phonon interaction, which have …
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Phonon-mediated Casimir effect
… the finite quasiparticle weight. The considered magnon scattering processes on a single itinerant electron (hole) in a two-dimensional ferromagnet can be used further for the magnon-mediated Casimir interaction in quasi-two-dimensional ferromagnets.
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Inelastic light scattering in low-dimensional spin systems
… chain system LiCu2O2, (ii) the presence of three-magnon scattering and dynamic spin-phonon coupling in the three-dimensional coupled spin dimer systems ACuCl3 (A=Tl, K), (iii) anomalous low-energy excitations including two-magnon scattering and electronic/orbital excitations in the two-dimensional …
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Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies
… We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above …
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Control of Nonlinear Properties of van der Waals Materials
… due to the inter-layer coupling of the exciton-magnon complexes present in the system. Strong coupling of CrSBr allows for tunable exciton-magnon-polaritons, and nonlinear experiments provide a platform for re-writable polariton landscapes. The ability to enhance second-harmonic generation, …
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