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The domain patterns in a thin ferromagnetic film are investigated in bothexperiments and numerical simulations. Magnetic domain patterns under a zerofield are usually observed after an external magnetic field is removed. It isdemonstrated that the characteristics of the domain patterns depend on thedecreasing rate of the external field, although it can also depend on otherfactors. Our numerical simulations and experiments show the followingproperties of domain patterns: a sea-island structure appears when the fielddecreases rapidly from the saturating field to the zero field, while alabyrinth structure is observed for a slowly decreasing field. The mechanism ofthe dependence on the field sweeping rate is discussed in terms of the conceptsof crystallization.Comment: 4 pages, 3 figure

Magnetic Domain Patterns Depending on the Sweeping Rate of Magnetic Fields