Patterned magnetic thin films for ultra high density recording
The epitaxially induced tensile stress in the MnSi thin films creates an easy-plane uniaxial anisotropy.
Magnetic Thin Films | Thin Film | Quantum Mechanics
Daniel Loss received a Ph.D. in Theoretical Physics at the University of Zurich in 1985 under the supervision of Prof. A. Thellung. He stayed there as postdoctoral researcher for four more years before moving to the US in 1989. From 1989 to 1991 he worked as postdoctoral researcher in the group of Prof. A. J. Leggett, Urbana, and from 1991 to 1993 at IBM Research Center, NY (USA). In 1993 he moved to Vancouver (Canada) to become Assistant and then Associate Professor of Physics at Simon Fraser University. In 1996 he returned to Switzerland to become full Professor of Theoretical Physics at the University of Basel. Loss is director of the Basel Center for Quantum Computing and Quantum Coherence (QC2), and co-director (2006) of the Swiss National Center of Competence and Research (NCCR) in Nanoscale Science at the University of Basel. He received several prestigious fellowships, is a Fellow of the American Physical Society, has been awarded the Humboldt Research Prize in 2005, and the Marcel Benoist Prize in 2010 — the most prestigious science prize in Switzerland (see , and ). He is married and has two sons.
Loss′s research interests include many aspects of the theory of condensed matter systems with a particular focus on spin-dependent and phase-coherent phenomena (‘mesoscopics’) in semiconducting nanostructures and molecular magnets. A major portion of Loss′s current research involves the theory of spin dynamics, spin coherence, spintronics in two-dimensional electron gases, and spin-related phenomena in semiconducting quantum dots--artificial atoms and molecules. Part of this work is related to quantum information processing (QIP)--quantum computing and quantum communication in solid state systems with focus on spin qubits, where Loss and collaborators made seminal contributions. Their theoretical predictions and proposals have stimulated many further investigations, and in particular many experimental programs on spin qubits worldwide. Current research includes spin relaxation and decoherence in quantum dots due to spin-orbit and hyperfine interaction; non-Markovian spin dynamics in bosonic and nuclear spin environments; generation and characterization of non-local entanglement with quantum dots, superconductors, Luttinger liquids or Coulomb scattering in interacting 2DEGs; spin currents in magnetic insulators and in semiconductors; spin Hall effect in disordered systems; spin orbit effects in transport and noise; asymmetric quantum shot noise in quantum dots; entanglement transfer from electron spins to photons; QIP with spin qubits in quantum dots and molecular magnets; macroscopic quantum phenomena (spin tunneling and coherence) in molecular and nanoscale magnetism.
Applying a magnetic field to natural water causes a redistribution of flow energy because of a momentum change of charged particles. All the particles and ions are electrically charged such that when magnetic fields are introduced convection and induced currents cause the liquid to spin. This movement then effects changes in gas content and the amount of salt crystallization centers in the water (Sherkliff, 1965). The quick change of the magnetic field in a properly designed magnetic water softener loosens hydrate layers and films in a moving liquid, thus enabling coagulation and coalescence (Bogatin et al., 1999).
backbone for monetary support for magnetic thin films
The interest in the interaction of laser pulses with materials for formation of noble metal nanoparticles in order to design photonic structures with novel optical properties is provoked by the development of the modern optoelectronics, which is based on nanostructured materials, and the need to refine the fundamental concepts of the effect of laser beams on the properties of inhomogeneous media. One of the approaches to developing novel materials and improving their functions is to combine two or more functional phases. The investigation of nanoparticle-doped transparent materials could determine the effective methods for fabrication to control the spatial distribution of nanoparticles in the glass matrice. The size of nanoparticles and their spatial distribution can be controlled by the conditions of the laser deposition and the parameters of laser irradiation. Noble metal doped thin films are grown from a mosaic target, consisted of glass covered by a sector of Ag or Au. Thus, the ablation of a rotating target during the PLD (pulsed laser deposition) process results in the growing of composite thin films. A nanosecond fourth-harmonic Nd:YAG laser is used for ablation at room temperature in a vacuum chamber. A laser-assisted method for manipulation of the optical properties of the grown nanocomposite material is applied. The changes of structural and morphological properties are studied with respect the induced defectrs and coloration of the samples. The influence of the nanosecond UV-laser annealing on the optical spectra and plasmon resonance properties of the samples is investigated.
Although Silicon is the dominant technology in photovoltaic area, in a surprisingly short time, Hybrid Inorganic-Organic perovskites, lead halide MAPbI3 typically, have emerged with excellent photophysical properties reaching similar solar efficiencies as commercial CdTe and CIGS thin films solar cells, surpassing 20% certified efficiency. Perovskite solar cells have the advantage of enabling cost-effective and low temperature processing. However, there are critical yet unresolved issues such as reproducibility, stability in environmental conditions and toxicity of its components. We have previously shown that substrate nature influences the final properties of the MAPbI3 thin film in terms of deegre of preferential orientation, lattice paramenters and optical bulk properties. On the other hand, due to its excellent electronic and optical properties, graphene is also being intensively studied for optoelectronic applications. It is described here how the optical and structural properties are affected by the partial substitution of lead by other less toxic ions and how the incorporation of graphene in the active layer can lead to a marked improvement in the yield of the graphene-free sample. In addition, an increase in environmental stability was observed due to the inhibition of PbI2 formation.
Dynamic processes in magnetic thin films
4-Dimethylamino-2ʹ-hydroxychalcone (DHC) shows unusual deep red to near-infrared emission with high quantum yield in its single crystalline form, making it a potential candidate for in vivo imaging and probing, night vision devices, and optical communication applications. In this talk, we reveal the excited state deactivation mechanisms of DHC in solution and in crystalline form by measuring the femtosecond-nanosecond dynamics using fluorescence upconversion and transient absorption techniques. The ultrafast dynamics show that the source of the intense red fluorescence is due to an excited-state intermolecular proton transfer (ESIPT) process that leads to a keto tautomer. This process takes place during the initial 2-3 ps after excitation in the rigid crystalline form. The ultrafast ESIPT process is absent in solution due mainly to a twisting motion within the molecular backbone that acts as an efficient nonradiative decay channel. The current results should serve as a benchmark for possible substituent modifications in the chalcone backbone in order to stabilize the keto tautomer in solution. This should be useful in imaging and diagnostic applications in vivo.
» ~ The superb classic Tantric text on Pranayama Yoga.
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(1967) Dynamic processes in magnetic thin films
Surface effects on spinwave resonance in thin magnetic films
Ciccacci"Structural versus magnetic properties at the surface of Fe filmsduring oxygen-assisted homoepitaxial growth"
Magnetic Thin Film Thesis - ReCAAP ISC
Mattera"Study of the growth and the magnetism of ultrathin films of Cr on Fe"
especially in the field of magnetic thin films.
Valbusa"Uniaxial magnetic anisotropy tuned by nanoscale ripple formation:Ion-sculpting of Co/Cu(001) thin films"
Investigating magnetisation dynamics in magnetic thin films and ..
She has fluorinated YBa2Cu3Ox thin films using the same solid/gas technique. The crystallographic studies performed on these thin films have shown that they were not degraded, their crystalline characteristics being entirely maintained after fluorination. In any case, the superconducting properties of deficient thin films were improved after fluorination.
This thesis deals with electrical conductivity in thin films
As we are rapidly approaching year 2050 and the population capacity of planet Earth, it becomes a must to, sooner better than later, face our gigantic challenges. It is widely known that our global stability is seriously threatened by the consequences of our depleting energy and clean water resources. Extensive scientific research over the past 15 years has shown that Nano-technology-based solutions hold promising answers to our pressing needs. However, it is very important to understand the thermodynamic fundamentals governing the structure and performance of such thermodynamic small systems especially their ability to selectively interact with certain chemical moieties and with electromagnetic radiation. Understanding such fundamentals will definitely lead to unique solutions for our pressing challenges. Nanostructured films based photovoltaics are a very promising rout to explore when addressing energy challenges. In this talk, we will discuss both experimental and molecular simulation fundamental work, done in our research group, as related to solar Energy.
Ross Ulbricht Masters Thesis | Thin Film | Ferromagnetism
Thermodynamics vs kinetics; Homogeneous and heterogeneous reactions - chemical reaction control rate equation, reaction rate constant, reaction order, non-elementary reactions; Solid State Diffusion -Fick’s Law, mechanisms of diffusion, uphill diffusion, Kirkendall effect, steady and transient diffusion; External mass transfer -fluid flow and its relevance to mass transfer, general mass transport equation, concept of mass transfer coefficient, models of mass transfer -film theory and Higbie’s penetration theory; Internal mass transfer-ordinary and Knudsen diffusion, mass transfer with reaction; Adsorption –physical adsorption vs. chemisorption, adsorption isotherms - Langmuir, BET; Adsorption as the rate limiting step examples - gasification of C by CO2, dissolution of N2 in molten steel; Porous solids - specific surface area and pore size distribution; Reactor design -batch vs continuous reactors, ideal stirred tank and plug flow reactors; Mass balance in ideal reactors, residence time distribution; Models of industrial reactors; Electrochemical kinetics-concept of polarization, activation over potential, Butler-Volmer and Tafel’s equation, applications in electro-deposition and corrosion.
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