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Träfflista för sökning "LAR1:uu srt2:(1975-1999);pers:(Nordblad P)"

Sökning: LAR1:uu > (1975-1999) > Nordblad P

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  • Andersson, JO, et al. (författare)
  • Monte Carlo studies of the dynamics of an interacting monodispersive magnetic-particle system
  • 1997
  • Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER. - : AMER INST PHYSICS. - 0163-1829. ; 56:21, s. 13983-13988
  • Tidskriftsartikel (refereegranskat)abstract
    • The influence of the dipole-dipole interaction on the dynamics of monodispersive ensembles of magnetic nanoparticles have been studied by Monte Carlo simulations. An increased interaction strength drives the system from a state with only individual partic
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  • ANDERSSON, JO, et al. (författare)
  • OVERLAP LENGTH IN A CU-MN SPIN-GLASS PROBED BY AC SUSCEPTIBILITY
  • 1993
  • Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 48, s. 13977-13980
  • Tidskriftsartikel (refereegranskat)abstract
    • An important theoretical concept in the ‘’droplet” model of spin glasses is the existence of an overlap length. Experimentally this concept was verified by dc-magnetization measurements. However, recent ac-susceptibility measurements by Lefloch et al. [Europhys. Lett. 18, 647 (1992)] have been interpreted to contradict this result. In this paper, ac-susceptibility and dc-magnetization measurements on a Cu (2% Mn) spin glass are reported. The results of the ac-susceptibility measurements are consistent with dc measurements and provide evidence for the existence of an overlap length in 3d spin glasses at low temperatures.
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  • AYADI, M, et al. (författare)
  • SPIN-GLASS FREEZING IN CD1-XMNXTE
  • 1986
  • Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 54-7, s. 1223-1224
  • Tidskriftsartikel (refereegranskat)
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  • BAJOREK, A, et al. (författare)
  • ON EXCHANGE MECHANISM IN HG1-XMNXS
  • 1994
  • Ingår i: Journal of Magnetism and Magnetic Materials. - 0304-8853 .- 1873-4766. ; 131, s. 363-368
  • Tidskriftsartikel (refereegranskat)abstract
    • The magnetic susceptibility of Hg0.95Mn0.05S and Hg0.90Mn0.10S was measured by the SQUID technique. The experimental data were compared with the extended nearest neighbour pair approximation (ENNPA) calculation. The long range exchange interaction J = J(NN)R(-n), with the exponent n = 4, was found for both samples. The nearest neighbour exchange integral J(NN) was found to be around two times smaller than the effective exchange integral J(eff). The small value of the exponent n, which is a characteristic of the narrow gap semimagnetic semiconductors (SMSC’s), as well as the small J(NN)/J(eff) ratio, show the importance of a long-range exchange mechanism.
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  • Resultat 1-10 av 145

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