Sökning: "Magnetism"

Visar resultat 1 - 5 av 142 avhandlingar innehållade ordet Magnetism.

  1. 1. X-ray Absorption Spectroscopy on Nano-Magnet Arrays and Thin Films Magnetism and Structure

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Andreas Persson; Uppsala universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; self organization; nano-magnet; xmcd; exafs; peem; magnetism; NATURAL SCIENCES Physics Condensed matter physics Surfaces and interfaces; NATURVETENSKAP Fysik Kondenserade materiens fysik Ytor och mellanytor; NATURAL SCIENCES Physics Condensed matter physics Magnetism; NATURVETENSKAP Fysik Kondenserade materiens fysik Magnetism; Materiefysik; Physics of Matter;

    Sammanfattning : The magnetic and structural properties of nano magnet arrays and ferromagnetic thin films are investigated. Circular x-rays are used and extensive use is made in this Thesis of the X-ray Magnetic Circular Dichroism (XMCD) technique. By means of the XMCD magneto-optic sum rules the values of the orbital and spin moments are determined. LÄS MER

  2. 2. New Materials for Spintronics Electronic structure and magnetism

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ronny Knut; Uppsala universitet.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spintronics; X-ray photoemission; XPS; XMCD; XAS; magnetic semiconductors; HIKE; HAXPES; multilayer; monte carlo; magnetism; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Materials exhibiting new functionalities due to interdependent electric (e.g. conductivity) and magnetic properties are potentially interesting for spintronics applications. LÄS MER

  3. 3. Magnetism and Structure in Metallic Multilayers

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Erik Holmström; Uppsala universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Magnetism; Interfaces; Structure; KKR-ASA; CPA; Quantum Well; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : The interplay between magnetism and structure has been studied in magnetic multilayers by electronic structure calculations based on density functional theory and analyzed in terms of models. The main ideas behind the Korringa-Kohn-Rostocker Green’s function method are described and the implementation of the coherent potential approximation is outlined. LÄS MER

  4. 4. The interaction of light and magnetism in the TbxCo100-x system

    Detta är en avhandling från Uppsala : Department of Physics and Astronomy

    Författare :Agne Ciuciulkaite; Uppsala universitet.; [2019]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetism; rate-earth transition metal alloys; light-magnetism interaction; all-optical switching; Fysik; Physics;

    Sammanfattning : Development of the faster and denser magnetic memory storage elements has been an active area of research since early 20th century. The path of research on magnetization manipulation began with firstly changing the magnetization state of a medium in an external magnetic field, then heating of a medium and magnetizing with a permanent magnet was explored, while the latest efforts have been focused on switching the magnetization only by a polarized laser light. LÄS MER

  5. 5. Trends in Magnetism From Strong Correlations to “-onics” Technology

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Dmitry Yudin; Uppsala universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Strongly interacting electron systems; Spin dynamics; Topological matter; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Despite of enormous progress in experimental nanophysics theoretical studies of low-dimensional electron systems still remains a challenging task. Indeed, most of the structures are strongly correlated, so that an effective perturbative treatment is impossible due to the lack of a small parameter. LÄS MER