Search for dissertations about: "natural sciences physics condensed matter physics mesoscopic physics"

Showing result 1 - 5 of 33 swedish dissertations containing the words natural sciences physics condensed matter physics mesoscopic physics.

  1. 1. Modeling mesoscopic unconventional superconductors

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Patric Holmvall; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phase transitions; Andreev bound states; quasiclassical theory; mesoscopic thin-films; spontaneous symmetry breaking; time-reversal symmetry; Unconventional superconductivity; translational symmetry;

    Abstract : High-temperature superconducting materials are often experimentally realized as thin films that can be patterned into devices operating in the mesoscopic regime. On this length scale, various finite-size and surface effects heavily influence the nature of the superconducting state, and can induce new ground states with spontaneously broken symmetries. READ MORE

  2. 2. Resonant switching and vortex dynamics in spin-flop bi-layers

    University dissertation from Stockholm : KTH

    Author : Sergiy Cherepov; Vladislav Korenivski; Thomas Silva; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; spin-dynamics; MRAM; vortex; switching; NATURAL SCIENCES Physics Condensed matter physics; NATURVETENSKAP Fysik Kondenserade materiens fysik; NATURAL SCIENCES Physics Condensed matter physics Magnetism; NATURVETENSKAP Fysik Kondenserade materiens fysik Magnetism; NATURAL SCIENCES Physics Condensed matter physics Mesoscopic physics; NATURVETENSKAP Fysik Kondenserade materiens fysik Mesoskopisk fysik;

    Abstract : This thesis is a study of the static and dynamic behavior of the magne-tization in spin-flop bi-layers, which consist of two soft ferromagnetic layerscoupled by dipolar forces through a thin nonmagnetic spacer. The focus ofthe work is three fold: collective spin dynamics in the anti-parallel groundstate; resonant switching in the presence of thermal agitation; and static anddynamic behavior of the system in the vortex-pair state, with a particularemphasis on the interlayer core-core interaction. READ MORE

  3. 3. Mesoscopic phenomena in hybrid superconductor/ferromagnet structures

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Taras Golod; Vladimir Krasnov; Alexandre Bouzdine; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Physics Condensed matter physics; NATURVETENSKAP Fysik Kondenserade materiens fysik; Physics; fysik;

    Abstract : This thesis explores peculiar effects of mesoscopic structures revealed at low temperatures. Three particular systems are studied experimentally: Ferromagnetic thin films made of diluted Pt1-xNix alloy, hybrid nanoscale Nb-Pt1-xNix-Nb Josephson junctions, and planar niobium Josephson junction with barrier layer made of Cu or Cu0.47Ni0.53 alloy. READ MORE

  4. 4. Hybrid superconductor junctions with diluted PtNi ferromagnetic interlayer

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Taras Golod; Vladimir M. Krasnov; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Physics Condensed matter physics Superconductivity; NATURVETENSKAP Fysik Kondenserade materiens fysik Supraledning; NATURAL SCIENCES Physics Condensed matter physics Low temperature physics; NATURVETENSKAP Fysik Kondenserade materiens fysik Lågtemperaturfysik; materiefysik; Physics Of Matter; Solid State Physics; fasta tillståndets fysik;

    Abstract : This thesis describes experimental investigation of thin films made of diluted Pt 1-x Ni x ferromagnet alloy and Nb-Pt 1-x -Nb Josephson junctions. Such Hybrid Superconductor-Ferromagnet (S-F) Structures are of significant interest because of the new physics involved and possible applications in low temperature and spintronic devices. READ MORE

  5. 5. Charge and Energy Noise from On-demand Electron Sources

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Nastaran Dashti; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Boltzmann-Langevin approach.; fluctua- tions and noise; single-electron source; energy and heat currents; time-dependently driven mesoscopic capaci- tor; charge current; Floquet scattering theory;

    Abstract : On-demand single electron sources (SES) are of key importance for future electronic applications such as metrology or quantum optics with electron. They allow for achieving a controlled, low-fluctuations flow of particles in a coherent mesoscopic conductor. READ MORE