Abstract
In magnetic nanoparticle systems, the variation of the blocking temperature TB with the measuring frequency fm is often used to determine the strength of the interparticle interactions (IPI) through a parameter Φ or the Vogel-Fulcher temperature To. Presence of IPI is inferred if To>0 and Φ=∆TB[TB∆log10fm]<0.13 where Δ signifies changes in TB and fm. Here it is shown that these two parameters are related by the Eq. Φ=Φo[1−(ToTB(1))] where Φo≈0.11–0.15 is a constant of the system depending on the magnitudes of measuring frequency and the attempt frequency fo of the Néel relaxation. Using data on a variety of nanoparticle systems, experimental verification of this relationship is also presented.
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