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Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

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The static and dynamic magnetic properties of nanocrystalline BaFe10.4Co0.8Ti0.8O19 M-type doped barium
ferrite were studied in detail to clarify the effect of interactions on the magnetic relaxation of an assembly of
small particles. The logarithmic approximation was unable to account for the magnetic relaxation of the
sample. Interaction effects were analyzed from the low-field susceptibility, DM plots and the time dependence
of thermoremanence, indicating that demagnetizing interactions led to an enhancement of both the relaxation
rate at low temperatures and the amount of the lowest energy barriers. It is thus suggested that care should be
taken when analyzing thermoremanent data at low temperature, in order not to confuse these experimental
findings with the signature of macroscopic quantum tunneling.

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Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.55.6440

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Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites