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In Phys. Rev. Lett. 91 167206 (2003), Sun et al. study memory effects in aninteracting nanoparticle system with specific temperature and field protocols.The authors claim that the observed memory effects originate from spin-glassdynamics and that the results are consistent with the hierarchical picture ofthe spin-glass phase. In this comment, we argue their claims premature bydemonstrating that all their experimental curves can be reproducedqualitatively using only a simplified model of isolated nanoparticles with atemperature dependent distribution of relaxation times.Comment: 1 page, 2 figures, slightly changed content, the parameters involved  in Figs. 1 and 2 are changed a little for a semi-quantitative comparision  with experimental result

Comment on “Memory Effects in an Interacting Magnetic Nanoparticle System”