Dynamic phase transition phenomena and magnetization reversal process in uniaxial ferromagnetic nanowires

• Ferromagnetic nanowires in the presence of ac fields have been simulated.
• We give hysteresis loops, magnetization time series, magnetic domain patterns.
• Physical origin of maximum lossy point in HLA curves has been clarified.
• We found a number of interesting phenomena peculiar to dynamic systems.

By utilizing the Monte Carlo simulation technique with Metropolis algorithm, we have studied the dynamic phase transition properties such as dynamic hysteresis loops and frequency dispersion of their area in the presence of externally applied oscillating magnetic fields. Particular attention has been paid on the variation of the hysteresis loop area (HLA) curves and their maximal behavior at different temperature regimes. In order to understand the physical mechanism behind the maximum lossy point observed in HLA curves, time series of instantaneous magnetization, as well as micromagnetic domain structures have been provided. Most of the qualitative aspects of the results reported in the present work are shown to be not model-specific type but common phenomenon observed in dynamic magnetic systems.

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