A Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"

Details A Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System" A Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"

2004-03-15

arxiv.org/abs/cond-mat/0403368v1

Phys. Rev. Lett. 93, 139702 (2004)

Physics

Condensed Matter

Other Condensed Matter

A comment on "Phys. Rev. Lett. 91, 167206"

Scientific paper

10.1103/PhysRevLett.93.139702

Recently, Sun et al reported that striking memory effects had been clearly observed in their new experiments on an interacting nanoparticle system [1]. They claimed that the phenomena evidenced the existence of a spin-glass-like phase and supported the hierarchical model. No doubt that a particle system may display spin-glass-like behaviors [2]. However, in our opinion, the experiments in Ref. [1] cannot evidence the existence of spin-glass-like phase at all. We will demonstrate below that all the phenomena in Ref. [1] can be observed in a non-interacting particle system with a size distribution. Numerical simulations of our experiments also display the same features.

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