Cole-Cole analysis of the superspin glass system Co80Fe20/Al2O3

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dc.creatorPetracic, O.
dc.creatorSahoo, S.
dc.creatorBinek, Ch.
dc.creatorKleemann, W.
dc.creatorSousa, J. B.
dc.creatorCardoso, S.
dc.creatorFreitas, P. P.
dc.date2002-07-17
dc.date.accessioned2026-07-07T02:46:18Z
dc.date.available2026-07-07T02:46:18Z
dc.descriptionAc susceptibility measurements were performed on discontinuous magnetic multilayers [Co80Fe20(t)/Al2O3(3nm)]x10, t = 0.9 and 1.0nm, by Superconducting Quantum Interference Device (SQUID) magnetometry. The CoFe forms nearly spherical ferromagnetic single-domain nanoparticles in the diamagnetic Al2O3 matrix. Due to dipolar interactions and random distribution of anisotropy axes the system exhibits a spin-glass phase. We measured the ac susceptibility as a function of temperature 20 < T < 100K at different dc fields and as a function of frequency 0.01 < f < 1000Hz. The spectral data were successfully analysed by use of the phenomenological Cole-Cole model, giving a power-law temperature dependence of the characteristic relaxation time tau_c and a high value for the polydispersivity exponent, alpha = 0.8, typical of spin glass systems.
dc.description11 pages (LaTeX2e), 6 figures (eps), Proceedings SDHS 2001-Duisburg, Germany, submitted to Phase Transitions
dc.identifierhttps://arxiv.org/abs/cond-mat/0207417
dc.identifierhttp://arxiv.org/abs/cond-mat/0207417
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19622
dc.subjectDisordered Systems and Neural Networks
dc.subjectStatistical Mechanics
dc.titleCole-Cole analysis of the superspin glass system Co80Fe20/Al2O3
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