A Theory for Spin Glass Phenomena in Interacting Nanoparticle Systems
msra(2006)
摘要
Dilute magnetic nanoparticle systems exhibit slow dynamics [1] due to a broad
distribution of relaxation times that can be traced to a correspondingly broad
distribution of particle sizes [1]. However, at higher concentrations
interparticle interactions lead to a slow dynamics that is qualitatively
indistinguishable from that dislayed by atomic spin glasses. A theory is
derived below that accounts quantitatively for the spin-glass behaviour. The
theory predicts that if the interactions become too strong the spin glass
behaviour disappears. This conclusion is in agreement with preliminary
experimental results.
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关键词
neural network,particle size,spin glass,relaxation time
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