Sökning: "magnetism"

Visar resultat 1 - 5 av 141 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. 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

  5. 5. A Theoretical Study of Magnetism in Nanostructured Materials

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anders Bergman; Uppsala universitet.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; magnetism; clusters; non-collinear; multilayers; first-principles theory; electronic structure; high-moment materials; exchange interactions; linear scaling methods; Fysik;

    Sammanfattning : A first-principles linear scaling real-space method for investigating non-collinear magnetic behaviour of nanostructured materials has been developed. With this method, the magnetic structures of small supported transition metal clusters have been examined. LÄS MER