Effective collective barrier for magnetic relaxation in frozen ferrofluids
Source abstract
Abstract
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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Research context
OpenAlex topics: Theoretical and Computational Physics · Characterization and Applications of Magnetic Nanoparticles · Complex Systems and Time Series Analysis
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References (29)
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