Dynamic magnetic response in ABA type trilayered systems and compensation phenomenon

Abstract: Dynamic magnetic response in a trilayered structure with non-equivalent layers (ABA type) has been studied with Monte Carlo simulation using Metropolis algorithm. In each layer, ferromagnetic (FM) nearest neighbour Ising interactions are present along with antiferromagnetic (AFM) nearest neighbour coupling across different layers. The system is studied under a harmonically oscillating external magnetic field. It is revealed that along with dynamic phase transition (DPT), compensation phenomenon emerges in this system under dynamic scenario too. This feature in dynamic case is unique for such trilayered systems only, in contrast to the bulk system reported earlier. The temporal behaviour of the magnetisation of each individual layer shows that different magnetic response of the non-equivalent layers results into such dynamic compensation phenomenon. The difference in response also results into warping of the dynamic hysteresis loops, under various external parameter values, such as amplitude of the oscillating field and temperature.