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A dynamic phase transition (DPT) with respect to the period P of an appliedalternating magnetic field has been observed previously in numericalsimulations of magnetic systems. However, experimental evidence for this DPThas thus far been limited to qualitative observations of hysteresis loopcollapse in studies of hysteresis loop area scaling. Here, we presentsignificantly stronger evidence for the experimental observation of this DPT,in a [Co(4 A)/Pt(7 A)]_3-multilayer system with strong perpendicularanisotropy. We applied an out-of-plane, time-varying (sawtooth) field to the[Co/Pt]_3 multilayer, in the presence of a small additional constant field,H_b. We then measured the resulting out-of-plane magnetization time series toproduce nonequilibrium phase diagrams (NEPDs) of the cycle-averagedmagnetization, Q, and its variance, Var(Q), as functions of P and H_b. Theexperimental NEPDs are found to strongly resemble those calculated fromsimulations of a kinetic Ising model under analagous conditions. The similarityof the experimental and simulated NEPDs, in particular the presence of alocalized peak in the variance Var(Q) in the experimental results, constitutesstrong evidence for the presence of this DPT in our magnetic multilayersamples. Technical challenges related to the hysteretic nature and responsetime of the electromagnet used to generate the time-varying applied fieldprecluded us from extracting meaningful critical scaling exponents from thecurrent data. However, based on our results, we propose refinements to theexperimental procedure which could potentially enable the determination ofcritical exponents in the future.

Evidence for a dynamic phase transition in [Co/Pt]_3 magnetic multilayers