Monte Carlo study of magnetization dynamics in uniaxial ferromagnetic nanowires in the presence of oscillating and biased magnetic fields.

Abstract

We examine the dynamic phase transition properties of ferromagnetic uniaxial nanowires with tunable radius r in the presence of both oscillating and biased magnetic fields. Variation of the transition temperature as a function of amplitude h0 of the oscillating field has been analyzed in the absence of magnetic bias hb and at constant oscillation period P. We find that the transition temperature as a function of h0 exhibits an exponential decay behavior. We also investigate the magnetization dynamics in terms of magnetic hysteresis loops as functions of the parameters hb, h0, and P. Our calculations are qualitatively in agreement with the recent experimental results obtained for uniaxial cobalt films in which it was concluded that the bias field hb is the conjugate field of the dynamic order parameter.