Are there superspin glasses?
نویسندگان
چکیده
منابع مشابه
- 1 - Spin glass behavior in an interacting γ - Fe 2 O 3 nanoparticle system
In this paper we investigate the superspin glass behavior of a concentrated assembly of interacting maghemite nanoparticles and compare it to that of canonical atomic spin glass systems. ac versus temperature and frequency measurements show evidence of a superspin glass transition taking place at low temperature. In order to fully characterize the superspin glass phase, the aging behavior of bo...
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The spin-glass-like behavior observed in mechanically alloyed Al49Fe30Cu21 is attributed to the collective freezing of ferromagnetic nanoclusters, i.e., the appearance of a superspin glass phase. The presence of the clusters and their estimated size (;1 nm) were inferred from magnetization measurements. The transition critical exponent zn513.860.4, extracted from ac-susceptibility data, is simi...
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In this paper we report on zero field cooled magnetization relaxation experiments on a concentrated frozen ferrofluid exhibiting a low temperature superspin glass transition. Using a method initially developped for spin glasses we are able to extract the dynamical correlation length and its time dependence from the Zeeman coupling between the applied magnetic field and the typical number of cor...
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The Parisi solution of the mean-field spin glass has been widely accepted and celebrated. Its marginal stability in 3d and its complexity however raised the question of its relevance to real spin glasses. This paper gives a short overview of the important experimental results which could be understood within the mean-field solution. The existence of a true phase transition and the particular be...
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Nanomagnetism is a branch of nanotechnology, which studies the magnetic properties of nanoparticles. Single-domain superparamagnetim, superferromagnetism and superspin glasses are different magnetic states which have been observed in a system of nanoparticles. Each of these magnetic states has unique features which determines the application range of magnetic nanoparticles assembly. Shell of na...
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