We investigate experimentally as well as theoretically the dynamic magnetic phase diagram and its associated order parameter $Q$ upon the application of a non-antisymmetric magnetic field sequence composed of a fundamental harmonic component $H_0$, a constant bias field $H_b$, and a second-harmonic component $H_2$. The broken time antisymmetry introduced by the second-harmonic field component $H_2$ leads to an effective bias effect that is superimposed onto the influence of the static bias $H_b$. Despite this interference, we can demonstrate the existence of a generalized conjugate field $H^{*}$ for the dynamic order parameter $Q$, to which both the static bias field and the second-harmonic Fourier amplitude of the field sequence contribute. Hereby, we observed that especially the conventional paramagnetic dynamic phase is very susceptible to the impact of the second-harmonic field component $H_2$, whereas this additional field component leads to only very minor phase-space modifications in the ferromagnetic and anomalous paramagnetic regions. In contrast to prior studies, we also observe that the critical point of the phase transition is shifted upon introducing a second-harmonic field component $H_2$, illustrating that the overall dynamic behavior of such magnetic systems is being driven by the total effective amplitude of the field sequence.

• Received 13 July 2021
• Accepted 4 October 2021

DOI:https://doi.org/10.1103/PhysRevE.104.044125