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arxiv: cond-mat/0207417 · v1 · submitted 2002-07-17 · ❄️ cond-mat.dis-nn · cond-mat.stat-mech

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

O.Petracic (1) , S. Sahoo (1) , Ch. Binek (1) , W. Kleemann (1) , J. B. Sousa (2) , S. Cardoso (3) , P. P. Freitas (3) ((1) Laboratorium f\"ur Angewandte Physik , Gerhard-Mercator-Universit\"at Duisburg
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Germany (2) IFIMUP Universidade de Porto Portugal (3) INESC Lisbon Portugal)
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classification ❄️ cond-mat.dis-nn cond-mat.stat-mech
keywords al2o3co80fe20cole-colefunctionglasssusceptibilitysystemtemperature
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Ac 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.

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