Sökning: "X-ray reflectometry"

Visar resultat 6 - 10 av 14 avhandlingar innehållade orden X-ray reflectometry.

1. 6. 11B4C containing Ni/Ti neutron multilayer mirrors

   Författare :Sjoerd Broekhuijsen; Fredrik Eriksson; Jens Birch; Thierry Bigault; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The work in this thesis covers the design, growth and characterisation of neutron multilayers. The performance of these multilayers is highly dependent on the obtained interface width between the layers, even a modest improvement can offer a substantial increase in reflectivity performance. LÄS MER

3. 7. Structural and Magnetic Properties of Fe/Co (001) and Fe/V (001) Superlattices

   Författare :Peter Blomqvist; Jens Birch; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Tunna filmer; kristallin struktur; magnetism; järn; kobolt; vanadin; Physics; Fysik; fysik; Physics;

   Sammanfattning : The structural and magnetic properties of Fe/Co (001) and Fe/V (001) superlattices have been investigated. The thin film structures were deposited on MgO (001) substrates using a four source ultra-high-vacuum based sputtering equipment. LÄS MER

4. 8. Growth of high quality Fe thin films : A study of the effect of mismatch strain on the physical properties of Fe

   Författare :Anna Lena Ravensburg; Vassilios Kapaklis; Björgvin Hjörvarsson; Tomas Kubart; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; thin film growth; crystal quality; strain; magnetism; electronic transport; Fysik; Physics;

   Sammanfattning : The work in this licentiate is devoted to investigating the epitaxial growth of thin Fe layers on MgAl2O4 (001) and MgO (001) substrates using dc magnetron sputtering. The aim is to qualitatively and quantitatively determine the crystal quality of the grown Fe layers depending on their thickness, substrate material, and selected deposition parameters. LÄS MER

5. 9. The effect of nano-confinement on hydrogen uptake in metallic superlattices

   Författare :Sotirios A. Droulias; Max Wolff; Gunnar K. Pálsson; Björgvin Hjörvarsson; Daniel Azofeifa; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The absorption of hydrogen is exothermic in vanadium whereas it is endothermic in iron and chromium. Investigations of the hydrogen uptake within Fe/V(001) and Cr/V(001) superlattices allow therefore a detailed exploration of finite size effects and the influence of boundaries on hydrogen absorption. LÄS MER

7. 10. Hydrogen in ultrathin vanadium layers

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