Hysteresis and the dynamic phase transition in thin ferromagnetic films

Details Hysteresis and the dynamic phase transition in thin ferromagnetic films Hysteresis and the dynamic phase transition in thin ferromagnetic films

2000-12-11

arxiv.org/abs/cond-mat/0012190v2

Physics

Condensed Matter

Statistical Mechanics

PDF file, 21 pages including 8 figure pages; added references,typos added; to be published in PRE

Scientific paper

10.1103/PhysRevE.63.066119

Hysteresis and the non-equilibrium dynamic phase transition in thin magnetic films subject to an oscillatory external field have been studied by Monte Carlo simulation. The model under investigation is a classical Heisenberg spin system with a bilinear exchange anisotropy in a planar thin film geometry with competing surface fields. The film exhibits a non-equilibrium phase transition between dynamically ordered and dynamically disordered phases characterized by a critical temperature Tcd, whose location of is determined by the amplitude H0 and frequency w of the applied oscillatory field. In the presence of competing surface fields the critical temperature of the ferromagnetic-paramagnetic transition for the film is suppressed from the bulk system value, Tc, to the interface localization-delocalization temperature Tci. The simulations show that in general Tcd < Tci for the model film. The profile of the time-dependent layer magnetization across the film shows that the dynamically ordered and dynamically disordered phases coexist within the film for T < Tcd. In the presence of competing surface fields, the dynamically ordered phase is localized at one surface of the film.

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