Sökning: "orbital and spin magnetization"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden orbital and spin magnetization.

1. 1. First-principles theory of electrically-induced spin and orbital magnetization

   Författare :Leandro Salemi; Peter M. Oppeneer; Yuriy Mokrousov; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin-orbit torque; spin Hall effect; Rashba-Edelstein effect; spin Nernst effect; relativistic DFT; spin-orbitronics;

   Sammanfattning : Spin-orbit torques (SOTs) have emerged recently as practical tools to control the magnetization in spintronic devices, but it is debated what the underlying fundamental processes are that enable fast and energy-efficient magnetization switching.In this thesis, we investigate theoretically possible means of controlling magnetization in magnetic materials and heterostructures. LÄS MER

3. 2. X-ray Absorption Spectroscopy on Nano-Magnet Arrays and Thin Films : Magnetism and Structure

   Författare :Andreas Persson; Dimitri Arvanitis; Cormac McGuinness; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; self organization; nano-magnet; xmcd; exafs; peem; magnetism; Surfaces and interfaces; Ytor och mellanytor; Magnetism; 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

4. 3. Relativistic theory of laser-induced magnetization dynamics

   Författare :Ritwik Mondal; Peter M. Oppeneer; Jan Rusz; Olle Eriksson; Paul-Antoine Hervieux; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Relativistic quantum electrodynamics; magneto-optics; spin-orbit coupling; ultrafast demagnetization; inverse Faraday effect; magnetic inertia; Gilbert damping; Fysik; Physics;

   Sammanfattning : Ultrafast dynamical processes in magnetic systems have become the subject of intense research during the last two decades, initiated by the pioneering discovery of femtosecond laser-induced demagnetization in nickel. In this thesis, we develop theory for fast and ultrafast magnetization dynamics. LÄS MER

5. 4. Role of charge and spin fluctuations and their interplay in solids : A Green’s function approach

   Författare :Tor Sjöstrand; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Green’s function; correlations; collective excitations; screened interaction; electric polarization; orbital and spin magnetization; magnon-phonon interaction; Fierz ambiguity; time-dependent exchange-correlation potential;

   Sammanfattning : Due to the large number of electrons, solid state physics boils down to many-body approximations in which only selected types of collective excitations are taken into account, guided by the emergent properties of the material under study. In this thesis, the collective excitations of primary interest are electronic charge and spin fluctuations(plasmons and magnons) and nuclear charge fluctuations (phonons). LÄS MER

7. 5. Effects of Spin-Orbit Interactions in Ferromagnetic Metal Nanoparticles

   Författare :Aleksander Cehovin; Matematisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrical; magnetic and optical properties; elementary spin excitations; spektroskopi; magnetisk resonans; supraledare; electron tunneling spectroscopy; Condensed matter:electronic structure; magnetic anisotropy; spin-orbit interactions; magnetism in nanostructures; egenskaper elektriska; ferromagnetic materials; magnetiska och optiska ; Kondenserade materiens egenskaper:elektronstruktur; relaxation; spectroscopy; supraconductors; magnetic resonance; Fysicumarkivet A:2003:Cehovin;

   Sammanfattning : This thesis is a theoretical investigation of the effects of spin-orbit (SO) interactions in ferromagnetic metal nano-particles. Part I of the thesis is devoted to an elementary introduction of the research field, including recent experimental advances which partly motivated the work presented here. LÄS MER