Sökning: "noncollinear"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet noncollinear.

  1. 1. Electronic Structure and Statistical Methods Applied to Nanomagnetism, Diluted Magnetic Semiconductors and Spintronics

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Lars Bergqvist; Olle Eriksson; Warren Pickett; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; spintronics; magnetism; Monte Carlo; critical temperature; exchange interactions; percolation; disorder; noncollinear; electronic structure; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : This thesis is divided in three parts. In the first part, a study of materials aimed for spintronics applications is presented. More specifically, calculations of the critical temperature in diluted magnetic semiconductors (DMS) and half-metallic ferromagnets are presented using a combination of electronic structure and statistical methods. LÄS MER

  2. 2. Scaling and Gating Attosecond Pulse Generation

    Detta är en avhandling från Atomic Physics, Department of Physics, Lund University

    Författare :Christoph Heyl; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Coherent imaging; Ultrafast electron dynamics; Single attosecond pulses; Attosecond pulse trains; XUV sources; High-order harmonic generation; XUV frequency combs; Fysicumarkivet A:2014:Heyl;

    Sammanfattning : High-order harmonic generation (HHG) provides the basis for attosecond light sources delivering coherent pulses in the extreme ultraviolet spectral region. Such light sources are employed for a variety of applications within imaging, attosecond spectroscopy, and high-precision frequency metrology. LÄS MER

  3. 3. Generation of Ultrashort Pulses – From Femtoseconds to Attoseconds

    Detta är en avhandling från Atomic Physics, Department of Physics, Lund University

    Författare :Maite Louisy; [2017-12-19]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Attosecond; Femtosecond; Ultrashort laser pulses; Ultrafast optics; High-order harmonic generation; extreme ultraviolet; Post-compression; Hollow-core capillary; d-scan; Optical gating; Fysicumarkivet A:2017:Louisy;

    Sammanfattning : Electronic dynamics takes place on the attosecond timescale and can thus only be studied using a tool with attosecond temporal resolution. High harmonic generation (HHG) provides coherent attosecond pulses in the extreme ultraviolet spectral region. LÄS MER

  4. 4. Hydrogen in ultrathin vanadium layers

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Gabriella Andersson; [1999]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; Fysik; Physics;

    Sammanfattning : The influence of elastic boundary conditions on the thermodynamics of hydrogen in vanadium were investigated using resistometry, x-ray diffraction and nuclear reaction analysis. To provide varying lattice strain states Mo/V (110) and Fe/V (001) superlattices with thickness L of individual layers in the range 3-16 monolayers (ML) were used. LÄS MER

  5. 5. Electronic Structure and Atomistic Spin Dynamics of Nanostructured Materials

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Debora C. M. Rodrigues; Anders Bergman; Manuel Pereiro; Olle Eriksson; Helena Petrilli; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : The theoretical studies of several magnetic materials are presented in this thesis. To each of them, it was investigated the electronic structure, by means of density functional theory calculations, and/or magnetization dynamics, in the context of atomistic spin dynamics (ASD). LÄS MER