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Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites Batlle Gelabert, Xavier García del Muro y Solans, Montserrat Labarta, Amílcar Matèria condensada Propietats magnètiques Magnetic properties Condensed matter 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. 2009-12-29T11:23:22Z 2009-12-29T11:23:22Z 1997 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0163-1829 https://hdl.handle.net/2445/10652 112428 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.55.6440 Physical Review B, 1997, vol. 55, núm. 10, p. 6440-6445 http://dx.doi.org/10.1103/PhysRevB.55.6440 (c) The American Physical Society, 1997 info:eu-repo/semantics/openAccess 6 p. application/pdf The American Physical Society Articles publicats en revistes (Física de la Matèria Condensada)