AI Article Synopsis
- The study calculates the ac-susceptibility of ferromagnetic nanoclusters that are weakly interacting and arranged in a periodic lattice using perturbation theory.
- Nonspherical samples exhibit significant shape effects due to dipolar interactions, leading to different responses in prolate (elongated) vs. oblate (flattened) samples as the strength of these interactions increases.
- The research indicates that a static applied field can reverse certain effects on susceptibility and that the temperature at which the out-of-phase susceptibility peaks shifts lower with stronger dipolar interactions, although high damping cases show differing behaviors based on sample shape.
Article Abstract
The ac-susceptibility of weakly interacting ferromagnetic nanoclusters located at the vertices of a periodic lattice in a static applied field is calculated using a perturbation theory. The samples are nonspherical which gives rise to predominant shape effects due to dipolar interactions. The effects observed on the maximum of the two components of the dynamical susceptibility when increasing the strength of the dipolar interactions are opposite for prolate and oblate samples. It is also shown that a static applied field can invert these effects. The peak position of the out-of-phase component of the ac-susceptibility shifts towards lower temperatures with increasing the strength of the dipolar interactions in most cases in agreement with previous numerical studies on isotropic systems. It is shown that the opposite behaviour can be observed in the high damping case because of a sample shape effect.
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| http://dx.doi.org/10.1166/jnn.2012.4953 | DOI Listing |
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