Sökning: "magnetism"

Visar resultat 1 - 5 av 54 uppsatser innehållade ordet magnetism.

  1. 1. Reducing the dynamical diffraction effects in EMCD by electron beam precession

    Kandidat-uppsats,

    Författare :Arvid Forsberg; [2020]
    Nyckelord :electron microscope; TEM; transmission electron microscope; EMCD; electron energy-loss magnetic chiral dichroism; magnetism; precession electron diffraction; crystals; crystallography;

    Sammanfattning : Dynamical effects are known to reduce the signal to noise ratio in EMCD measurements making them highly dependent on sample thickness. Precession of the electron beam has been shown to reduce these effects in ordinary crystallography. LÄS MER

  2. 2. Out-of-plane Ferromagnetic Resonance (FMR) measurements on magnetic nanoparticle dispersions for biomedical sensor applications

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Fasta tillståndets fysik

    Författare :Markus Back; [2020]
    Nyckelord :Ferromagnetic; magnetic; resonance; FMR; EPR; nanoparticle; microwave; coplanar; waveguide; cavity; s-parameter; gilbert; damping; gyromagnetic; liquid; biosensor; landau; lifshits; spin; polymer; composites; engineering physics; teknisk fysik; magnetism; ferromagnetisk; vågledare; resonans; mikrovågsteknik; nanopartiklar;

    Sammanfattning : In this master work, we investigated the feasibility of a magnetic resonance measurement technique using magnetic nanoparticle dispersions in both liquid and solid form. The implementation is realised as a coplanar waveguide operating in the frequency range of 0.5 - 20 GHz and an electromagnet producing a static magnetic field of strength up to 1. LÄS MER

  3. 3. Fabrication and characterization of novel nano-magnets

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Molekyl- och kondenserade materiens fysik

    Författare :Louise Lifvenborg; [2020]
    Nyckelord :nanotechnology; nano-magnets; magnetism; Master s Programme in Materials Engineering; Q; lithography;

    Sammanfattning : Magnetic data storing has been of great interest since 1950 when the first magnetic hard drive was fabricated. A lot has happened since then, but there is still a need for smaller and cheaper devices.  One way to achieve this is by creating nano-sized ferromagnetic areas in a thin film at room temperature, or nano-magnets. LÄS MER

  4. 4. Analysis of Cooling System and Its Influence on Magnetic Flux Density in a Motor

    Master-uppsats, Uppsala universitet/Institutionen för elektroteknik

    Författare :Ronaldo Gustav Pangihutan Hasibuan; [2020]
    Nyckelord :Generator; Motor; Permanent Machine;

    Sammanfattning : After Michael Faraday invented the magnetism theory in 1821, the application of the permanent magnet machine was rapidly developed. The permanent magnet synchronous machine is one of the popular applications of electromagnetic theory, which is implemented in most electric vehicles nowadays. LÄS MER

  5. 5. Accelerating longitudinal spinfluctuation theory for iron at high temperature using a machine learning method

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Marian Arale Brännvall; [2020]
    Nyckelord :Machine learning; longitudinal spin fluctuations; kernel ridge regression;

    Sammanfattning : In the development of materials, the understanding of their properties is crucial. For magnetic materials, magnetism is an apparent property that needs to be accounted for. There are multiple factors explaining the phenomenon of magnetism, one being the effect of vibrations of the atoms on longitudinal spin fluctuations. LÄS MER