Search for dissertations about: "Hjörvarsson Björgvin"

Showing result 16 - 20 of 33 swedish dissertations containing the words Hjörvarsson Björgvin.

2. 16. Magnetic Ordering in Layered Magnets

   Author : Moreno Marcellini; Björgvin Hjörvarsson; Roger C.C Ward; Uppsala universitet; []
   Keywords : Physics; Magnetic thin films and superlattices; Magnetic phase transitions; Polarized neutron reflectometry; Fysik;

   Abstract : The preparation of layered magnets needs the knowledge of growth techniques which are focused on the growth of Fe/V(001) superlattices. Such films have been structurally investigated by X-rays reflectivity and diffraction. READ MORE

4. 17. Magnetoplasmonic nanostructures

   Author : Emil Melander; Vassilios Kapaklis; Björgvin Hjörvarsson; Evangelos Th. Papaioannou; Paolo Vavassori; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Magnetism; nanostructures; plasmons; magneto-optics; magnetoplasmonics; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Abstract : Surfaces that are nanopatterned, metallic, and magnetic can support surface plasmon resonances, providing an alternative and effective way to reconfigure flat optical components. Utilising a range of near- and far-field characterisation techniques, the optical and magneto-optical properties of lithographically patterned thin magnetic films are investigated. READ MORE

5. 18. Phase Transitions and Phase Formation of Hydrogen in Quasi-2D Lattices

   Author : Stefan Olsson; Björgvin Hjörvarsson; Yuh Fukai; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; hydrogen; finite-size effects; long-ranged interactions; superlattices; phase transitions; elastic interaction; Fysik; Physics; Fysik;

   Abstract : The role of the dimensionality and strain state of metallic lattices on the phase behavior of dissolved hydrogen was explored. Metallic superlattices with well defined hydrogen absorption potential on the nm scale, were utilized as test systems. READ MORE

6. 19. Influence of Self-trapping, Clamping and Confinement on Hydrogen Absorption

   Author : Gunnar Karl Pálsson; Björgvin Hjörvarsson; Keith Ross; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydrogen diffusion; thin films; superlattices; phase transitions; confinement; clamping; self-trapping; finite-size effect; Surfaces and interfaces; Ytor och mellanytor; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Abstract : The dissociation of hydrogen molecules at surfaces is the first step in the absorption process. If the absorbing material is covered by an oxide, this layer will determine the effective uptake rate of an underlying absorbing material. READ MORE

7. 20. The Influence of Interlayer Exchange Coupling on Magnetic Ordering in Fe-based Heterostructures

   Author : Martin Pärnaste; Björgvin Hjörvarsson; Bryan Hickey; Uppsala universitet; []
   Keywords : Physics; magnetism; magnetic dimensionality; MOKE; magneto-optics; hydrogen loading; phase transitions; Fysik;

   Abstract : Temperature dependent magnetization measurements were conducted on Fe-based heterostructures. A linear increase of the magnetic critical temperature with increasing Fe thickness was found for Fe/V superlattices with strong interlayer exchange coupling. READ MORE