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Träfflista för sökning "WFRF:(Kapaklis Vassilios) ;pers:(Verschuuren Marc A.)"

Sökning: WFRF:(Kapaklis Vassilios) > Verschuuren Marc A.

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1.
  • Arnalds, Unnar B., et al. (författare)
  • A new look on the two-dimensional Ising model : thermal artificial spins
  • 2016
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 18
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a direct experimental investigation of the thermal ordering in an artificial analogue of an asymmetric two-dimensional Ising system composed of a rectangular array of nano-fabricated magnetostatically interacting islands. During fabrication and below a critical thickness of the magnetic material the islands are thermally fluctuating and thus the system is able to explore its phase space. Above the critical thickness the islands freeze-in resulting in an arrested thermalized state for the array. Determining the magnetic state we demonstrate a genuine artificial two-dimensional Ising system which can be analyzed in the context of nearest neighbor interactions.
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2.
  • Ciuciulkaite, Agne, et al. (författare)
  • Collective magnetization dynamics in nanoarrays of thin FePd disks
  • 2019
  • Ingår i: Physical Review B. - : AMER PHYSICAL SOC. - 2469-9950 .- 2469-9969. ; 99:18
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the magnetization dynamics of a square array of mesoscopic disks, fabricated from an iron palladium alloy film. The dynamics properties were explored using ferromagnetic resonance measurements and micromagnetic simulations. The obtained spectra exhibit features resulting from the interactions between the disks, with a clear dependence on both temperature and the direction of the externally applied field. We demonstrate a qualitative agreement between the measured and calculated spectra. Furthermore, we calculated the mode profiles of the standing spin waves excited during time-dependent magnetic field excitations. The resulting maps confirm that the features appearing in the ferromagnetic resonance absorption spectra originate from the temperature- and directional-dependent interdisk interactions.
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3.
  • Östman, Erik, et al. (författare)
  • Hysteresis-free switching between vortex and collinear magnetic states
  • 2014
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 16, s. 053002-
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate a lossless switching between vortex and collinear magnetic states in circular FePd disks arranged in a square lattice. Above a bifurcation temperature (Te) we show that thermal fluctuations are enough to facilitate flipping between the two distinctly different magnetic states. We find that the temperature dependence of the vortex annihilation and nucleation fields can be described by a simple power law relating them to the saturation magnetization.
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  • Resultat 1-3 av 3

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