Effective collective barrier for magnetic relaxation in frozen ferrofluids

Details Effective collective barrier for magnetic relaxation in frozen ferrofluids Effective collective barrier for magnetic relaxation in frozen ferrofluids

2003-12-03

arxiv.org/abs/cond-mat/0312087v1

J. Mag. Mag. Mat. 281 (2-3), 312-317 (2004)

Physics

Condensed Matter

Scientific paper

10.1016/j.jmmm.2004.04.120

Magnetic relaxation and frequency response were measured in frozen ferrimagnetic colloids of different concentrations. A crossover from reversible to irreversible behavior is observed for concentrated colloids. In irreversible state, magnetic relaxation is time-logarithmic over seven orders of magnitude of experimental time windows. A master curve construction within mean field phenomenological model is applied to extract effective collective barrier as a function of the irreversible magnetization. The barrier logarithmically diverges, providing evidence for self-organized critical behavior during magnetic relaxation in frozen ferrofluids.

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