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Sökning: WFRF:(Normile P.S.)

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1.
  • De Toro, J. A., et al. (författare)
  • A nanoparticle replica of the spin-glass state
  • 2013
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 102:18, s. 183104-
  • Tidskriftsartikel (refereegranskat)abstract
    • A simple single-phase material, a random close-packed (volume fraction 67%) ensemble of highly monodisperse bare maghemite (gamma-Fe2O3) nanoparticles, is shown to exhibit ideal superspin-glass behavior (mimicking that of model spin-glasses), namely, an unprecedentedly sharp onset of the absorption component of the ac susceptibility, narrow memory dips in the zero-field-cooled magnetization and a spin-glass characteristic field-dependence of the magnetic susceptibility. This ideal behavior is attributed to the remarkably narrow dispersion in particle size and to the highly dense and spatially homogeneous configuration ensured by the random close-packed arrangement. This material is argued to constitute the closest nanoparticle analogue to a conventional (atomic) magnetic state found to date. 
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4.
  • Normile, P. S., et al. (författare)
  • Demagnetization effects in dense nanoparticle assemblies
  • 2016
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 109:15
  • Tidskriftsartikel (refereegranskat)abstract
    • We highlight the relevance of demagnetizing-field corrections in the characterization of dense magnetic nanoparticle assemblies. By an analysis that employs in-plane and out-of-plane magnetometry on cylindrical assemblies, we demonstrate the suitability of a simple analytical formula-based correction method. This allows us to identify artifacts of the demagnetizing field in temperature-dependent susceptibility curves (e.g., shoulder peaks in curves from a disordered assembly of essentially bare magnetic nanoparticles). The same analysis approach is shown to be a straightforward procedure for determining the magnetic nanoparticle packing fraction in dense, disordered assemblies.
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  • Resultat 1-4 av 4

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