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Cole-Cole analysis of the superspin glass system Co80Fe20/Al2O3 | O.Petracic
; S. Sahoo
; Ch. Binek
; W. Kleemann
; J. B. Sousa
; S. Cardoso
; P. P. Freitas
; | Date: |
17 Jul 2002 | Subject: | Disordered Systems and Neural Networks; Statistical Mechanics | cond-mat.dis-nn cond-mat.stat-mech | Affiliation: | Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität Duisburg, Germany, IFIMUP, Universidade de Porto, Portugal, INESC, Lisbon, Portugal | Abstract: | 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. | Source: | arXiv, cond-mat/0207417 | Services: | Forum | Review | PDF | Favorites |
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