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 26 for “"Ferromagnetic Resonance"”.
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Current-induced torque driven ferromagnetic resonance in magnetic microstructures
… and an alternating current in a uniform ferromagnetic system. Diluted magnetic semiconductors (Ga,Mn)As and (Ga,Mn)(As,P) have been studied. Due to their strong spin-orbit coupling and well-understood band-structure, these materials are well-suited to this investigation. The combined …
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Electrical Manipulation of Spin Dynamics in Ferromagnetic Multi-layers
This thesis explores spin-detection in ferromagnetic materials via two different mechanisms that drive the ferromagnetic resonance – the charge-spin conversion via inverse spin-Hall effect induced by an external charge current and the photon-magnon coupling between ferromagnetic structures and …
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High Frequency Study of Magnetic Nanostructures
… the Vector Network Analyzer (VNA) to measure the Ferromagnetic Resonance (FMR))of various magnetic Nanowire arrays. We employed different measurement geometries using microstripline and coplanar waveguide as microwave transmission lines.</p> <p>In part three our aim was to study the magnetic …
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Current-induced torques in ferromagnets at room temperature
This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature. We apply a microwave current to the sample while sweeping the external magnetic field, and measure the longitudinal …
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Interaction Effects in Nickel Nanowires Arrays
… using vibrating sample magnetometer and X-band ferromagnetic resonance experiments. The results are explained taking into account the effects of the magnetostatic interactions and shape anisotropy.
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Fabrication and Magnetic Property Investigation of Metallic Nanowire Arrays
… Vibrating sample magnetometer (VSM) and ferromagnetic resonance (FMR) were utilized to investigate the magnetic properties of single Ni nanowire arrays of different lengths and Ni/Cu superlattice nanowire arrays. The VSM data exhibited that the magnetic easy axis of samples is parallel to …
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TIME RESOLVED PROBING OF MAGNETO-ELASTIC EXCITATIONS IN MAGNETIC MATERIALS
… acoustic degrees of freedom in transition-metal ferromagnetic systems. Within the NFFA-SPRINT laboratory, hosted in the premises of the facility FERMI@Elettra (Elettra-Sincrotrone Trieste), I developed a setup to perform optical Transient-Grating spectroscopy, and correlative time-resolved …
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Spin pumping measurements at interfaces between magnetic metal or insulator and organic semiconductors
… the presence of spin current is explored using ferromagnetic resonance damp- ing. Linewidth broadening in a ferromagnetic alloy is measured due to spin current dissipation into the neighbouring material. We explore non-spin origins of linewidth broadening and attempt to detect spin dissipation …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… first experiment, acoustically driven spin wave resonance in polycrystalline Ni thin films was investigated using the Transient Grating (TG) technique. The focus was on examining how the acoustic waves generated in the substrate influence and drive the magnetization dynamics of the Ni thin films …
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Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
… of 4 – 12 nm) on the complex permeability and ferromagnetic resonance (FMR) behavior. Size-dependent studies in MnFe₂O₄ and CoFe₂O₄ reveal that increasing particle size enhances both the real (μ′) and imaginary (μ″) parts of permeability due to reduced spin frustration and improved magnetic …
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Magnetization Dynamics in Ultrathin Films and Multilayers
… ultrathin films and multilayers using broadband ferromagnetic resonance (FMR) techniques and micromagnetic simulations. Chapter one includes the theoretical background on magnetization dynamics, the explanation of FMR experiments with schematic diagrams and data analysis, and insight in …
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Spin dynamics of fine magnetic particles
… model. The model was then used to simulate ferromagnetic resonance on a single particle and the results precisely matched the results predicted by analytical theory. The effect of particle anisotropy and alignment on the response was then investigated and the computed results agreed with …
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Ferromagnetic dynamics in coupled systems
In this work, ferromagnetic thin films coupled strongly to other physical subsystems (magnetic or otherwise) are studied, and the effect this coupling has on their static and dynamic properties is investigated in order to understand both the ferromagnets themselves, and the systems they are coupled …
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Spin Currents in Organic Semiconductors
… broadening of the microwave absorption at ferromagnetic resonance due to increase in effective Gilbert damping by spin pumping from a ferromagnetic substrate into an adjacent non-magnetic semiconductor allows us to quantify the spin-mixing conductance. This technique is employed to …
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Spin-mixing and transport through superconducting interlayers in ferromagnetic Josephson junctions
… ’singlet pairs’). In this thesis I investigate ferromagnetic nanopillar Josephson devices with different types of ferromagnetic barriers,incorporating spin-mixer interfaces and Rashba spin-orbit coupling. The research focuses on equilibrium spin-transport through intermediary superconducting …
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Spin Transport in Organic Semiconductors
… all electrical spin injection and detection to ferromagnetic resonance spin pumping and ISHE spin detection. Non-local spin valves and novel all electrical spin transport device architectures based on high mobility conjugated polymers were studied systematically. The intrinsic roadblocks for …
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Electrical control of spin dynamics in spin-orbit coupled ferromagnets
… presented here, a microwave current-induced ferromagnetic resonance (spin-orbit FMR) technique is used to characterise the dynamical magnetic properties and to determine the symmetries of the spin-orbit torques of ferromagnetic layers with broken inversion symmetry. Ultra-thin …
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Magnetic and Spintronic Properties of Rare-Earth Iron Garnets
… garnet thin films grown by liquid-phase epitaxy. Ferromagnetic resonance shows linear variation of the damping and the g-factor across the composition range, consistent with prior theoretical work. Domain imaging reveals differences in reversal modes, remanant states, and domain sizes in YxTm3-x …
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Decoherence of Transverse Electronic Spin Current in Magnetic Metals
… moments. The great interest in devices based on ferromagnetic metals generated intensive theoretical and experimental studies on the basic physics of spin currents for the last few decades. Of particular interest recently is the so-called "pure" electronic spin current, which is carried by …
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Optical control and probe of ferromagnetic and ferroic orders in films, heterostructures, and perovskite-based material systems
This dissertation is focused on ferromagnetic, multiferroics, and two-dimensional (2D) perovskites, exploring different unique collective magnetic and ferroic characters: (1) ferromagnetic thin film Co/Pd multilayers, (2) BaTiO3-BiFeO3 (BTO-BFO) a magneto-electric materials system, and (3) CuCl4 …
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