Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System" by Sun et. al, prl, 91, 167206 (2003)
Abstract
In this Comment we report a phenomenon identical to that observed in (Y. Sun, M. B. Salamon, K. Garnier and R. S. Averback, Phys. Rev. Lett. 91, 167206 (2003)) for systems of NiFe2O4 particles (mean size ≈ 3nm) embedded in a SiO2 matrix with two different interparticle spacings 4 nm (1) and 15 nm (2), which controls the strength of the dipolar interactions. Not only do we find the memory effect to be present in the non-interacting sample (2), indeed we find it to be more prominent than in the interacting case (1). We demonstrate that this effect can be simply attributed to a superposition of relaxation times of two sets of particles.
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