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Vinsamlegast notið þetta auðkenni þegar þið vitnið til verksins eða tengið í það: http://hdl.handle.net/1946/35490

Titill: 
  • Titill er á ensku Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures
Námsstig: 
  • Bakkalár
Útdráttur: 
  • Útdráttur er á ensku

    Magnetic behaviour of five bi-layer V2O3/Ni thin film samples sputtered on sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with
    very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate
    this. Nickel is a cubic crystal with easy axes <111>, hard axes <100> and medium axes <110>. In the simulations an external magnetic field was applied and then rotated in-plane as was done in the MOKE
    measurements. The result are hysteresis loops as a function of azimuthal angle yielding the normalized magnetic remanence and coercive field. This was done for two sample sizes with number of cells in x-, yand
    z- direction 128x128x2 and 256x256x2 both having cell size 4x4x10nm. The results did not change when sample size was increased. These simulations were done both for growth direction [111] and [100] out of plane. Quantitatively the results from simulations agree with magneto-crystalline energy for nickel, both when rotated around [111] and [100], showing a sixfold and fourfold symmetry respectively. The measured
    samples don’t show this sixfold symmetry.

Samþykkt: 
  • 20.5.2020
URI: 
  • http://hdl.handle.net/1946/35490


Skrár
Skráarnafn Stærð AðgangurLýsingSkráartegund 
Lokaverkefni_BAJ_Final.pdf12.01 MBOpinnHeildartextiPDFSkoða/Opna
Yfirlysing_signed.pdf227.9 kBLokaðurYfirlýsingPDF