Sökning: "nano-structures"

Visar resultat 6 - 10 av 28 avhandlingar innehållade ordet nano-structures.

  1. 6. Strongly non-linear magnetization dynamics in nano-structures: perturbations, multi-mode generation, and topological droplets

    Författare :Ezio Iacocca; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin torque oscillators; Spintronics; Spintronics;

    Sammanfattning : Spin torque oscillators (STOs) are magnetic nano-devices in which strongly non-linear magnetodynamic phenomena can be excited by current. In this thesis, we study some of these phenomena by means of micromagnetic simulations, analytical calculations, and electrical characterization. Three main subjects are discussed: 1. LÄS MER

  3. 7. Tailoring the magnetic order in mesoscopic spin systems

    Författare :Henry Stopfel; Vassilios Kapaklis; Hjörvarsson Björgvin; Unnar Arnalds; John Cumings; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; artificial spin ice; magnetic nano-structures; mesoscopic spin systems; mesospins; model systems; Shakti; Saint George; interaction modifier; engineering of energy-landscape; multiple energy-scales; Fysik; Physics;

    Sammanfattning : Mesoscopic spin systems can be designed and fabricated using modern nano-fabrication techniques. These systems can contain large numbers of patterned ferromagnetic elements, for which the shape will generally determine their effective mesospin dimensionality. LÄS MER

  4. 8. Collective properties of magnetic mesospins

    Författare :Erik Östman; Björgvin Hjörvarsson; Vassilios Kapaklis; Nicolas Rougemaille; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; artificial spin ice; magnetic nano-structures; mesoscopic spin systems; mesospins; mixed spin dimensionalities; interaction modifier; engineering of energy landscape; emergence;

    Sammanfattning : Mesoscopic spin systems consist of an ensemble of lithographically patterned nanomagnetic elements - mesospins. The interactions between the mesospins, can be designed at will by altering their lateral arrangement, enabling the study of collective magnetic order in a wide range of systems. LÄS MER

  5. 9. Fabrication of new silica nano structures and development of new concepts for MALDI-TOF mass spectrometry

    Författare :Andreas Woldegiorgis; Johan Roeraade; Peter J. Schoenmakers; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi; Chemistry; Kemi;

    Sammanfattning : A technique to alter the morphology of the inner surface of fused silica capillaries has been developed. The internal surface area is enlarged by means of nano-wires of silica, which are grown from the capillary walls. LÄS MER

  7. 10. Correlating structure of (arabino)xylans and their derivatives to dispersibility and film properties

    Författare :Ratchawit Janewithayapun; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Wood glucuronoxylans and wheat bran arabinoxylan represent significant sources of underutilized natural polymers. In this work, I aim to address a key challenge to their effective valorization, which is their complex chemical-structure-property relationship. LÄS MER