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 18 of 18 for “"Magneto-optical Kerr effect"”.
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A Biaxial Magneto-optical Kerr Magnetometer for Studying Magnetic Thin Films
I have designed and built a biaxial magneto-optical Kerr magnetometer to study thin magnetic films. The design enables researchers to measure perpendicular and in-plane hysteresis curves of ultra thin films down to a thickness of 9 A. The optical components are fastened to a vibration isolation …
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Einfluß der magnetischen Dipolkopplung auf den Tunnelmagnetowiderstand in Schichtsystemen und strukturierten Elementen
We have studied the effect of the dipolar magnetic coupling (also known as Néel coupling or "orange-peel" coupling) in tunneling magnetoresistive (TMR) elements. With an in situ scanning tunneling microscope we directly accessed the roughness of the films and found a close correspondence …
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Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
… thermoreflectance (BO-FDTR) and frequency domain magneto-optical Kerr effect (FD-MOKE) used to measure the anisotropic thermal properties with enhanced sensitivity. Monte Carlo computational method is also explained for uncertainty calculations. Finally, the demonstrations of measuring in-plane …
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The c33 elastic constant of MoS2 as a function of pressure and the deposition of multilayer thin films by sputtering
… multilayer transducers for use in time-resolved magneto-optical Kerr effect (TR-MOKE) experiments is also discussed, along with the preliminary film and transducer characterization. Four-point probe measurements of the thin films indicated high resistivities corresponding to roughness or small …
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Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling
… of this project was to study some unexplored optical and magneto-optical properties of the newest member of III-V ferromagnetic structures, InMnSb, as well as InSb films and InSb/AlInSb quantum wells. The emphasis was on dynamical aspects such as charge and spin dynamics in order to address …
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Ultrathin films on semiconductor substrates : growth, magneto-optical characteristics and spin injection
… especially their magneto-optical properties and spin injection.Magnetic ultrathin films were grown on different GaAs substrates using an e-beamevaporation technique. The MBE system which is used to fabricate and analyseultrathin films is home designed and assembled. …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… magnetization dynamics of the Ni thin films via magnetoelastic coupling. In a second experiment, the 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 …
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Dzyaloshinskii-Moriya Interaction and Local Exchange Variation in Rare-Earth Transition-Metal Ferrimagnets
… We develop a simple method for determining magneto-optical Kerr angles that informs efficient design of magneto-optical Kerr effect microscopes. Additionally, we observe a significant variation in both RE and TM average atomic moment as a function of composition well described by a local …
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Systematic Study of Parameters Affecting Unconventional Magnetism in Gold Nanostructures
… to the thiol used to coat it, and that the effect of an electron-withdrawing terminal group of the thiol is much greater than its chain length. The second series establishes that thiolate-coated gold thin-films are indeed magnetic, a notion previously debated. It shows the thin-films to be …
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Modifying the magnetic properties of Laves phase intermetallic multilayers and films by nano-patterning and ion implantation
… microelectromechanical sensors and actuators, to magnetoresistive random access memory and permanent magnetic data storage. Artificial structuring on the nano-scale will be beneficial in improving the functionality of exchange spring systems in all of these areas. In this work, two distinctly …
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An Investigation of the Structure, Pinning and Magnetoresistance of Domain Walls in Ni81Fe19 Planar Nanowires
… microstructural influences on the magnetic and magnetoresistance properties, along with a thorough understanding of the effect of geometrical confinement on domain wall (DW) structure and pinning behaviour in nanowire structures. The out-of-plane structural properties of thermally evaporated …
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Optical control and probe of ferromagnetic and ferroic orders in films, heterostructures, and perovskite-based material systems
… Co/Pd multilayers, (2) BaTiO3-BiFeO3 (BTO-BFO) a magneto-electric materials system, and (3) CuCl4 halide organic-inorganic perovskites. Low-power all-optical memory offers a unique opportunity to achieve ultra-fast magnetic switching in which the switching dynamics are not thermally mediated and …
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Ultrafast laser driven spin generation in metallic ferromagnets
… FM. The probe light measures spin responses by magneto-optical Kerr effect or temperature responses by time-domain thermoreflectance. I find that ultrafast laser light generates spins in FM in three distinct mechanisms: (i) demagnetization; (ii) spin-dependent Seebeck effect (SDSE); (iii) …
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Growth, Structural and Electrical Characterization of Topological Dirac Materials
… A comparison between electrical transport, Magneto-optical Kerr effect and terahertz time domain spectroscopy measurements revealed that the mechanism of magnetization was RKKY mediated. Furthermore, the bilayer structure displays a clear exchange bias coupling arising from the proximity of …
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Probing Coherent States and Nonlinear Properties in Multifunctional Material Systems
… of their coherent states and nonlinear optical properties. This study is aimed at characterizing, modeling, and controlling the fundamental electronic, phononic, and spin properties of several classes of materials through nonequilibrium and nonlinear light-matter interactions, coupled …
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Fabrication and Characterization of Three-Dimensional Magnetic Nanostructures
… in 3D geometries and adapting existing magneto-optical techniques to rapidly probe 3D nanostructures in the lab. As a result of this work, new tools and skills are available in the field of 3D nano-magnetism, unlocking a path for the development of sophisticated 3D nanomagnetic devices …
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Nanostructured magnetic materials for integrated magnonic devices
… fields. The MMAs, comprising patterned arrays of magnetostrictive nanomagnets embedded in piezoelectric heterostructures, generate multimode microwave frequencies through the phonon-magnon coupling. Static magnetic studies elucidate various magnetization reversal processes within the nanowire and …