Phase diagram of the mixed Ising model with Fe4N structure under a time-dependent oscillating magnetic field

• The mixed Ising model with Fe4N structure is studied by the mean-field theory.
• The dynamic phase boundaries in T/|J|−h0/|J|,T/|J|−DA/|J|T/|J|−h0/|J|,T/|J|−DA/|J| and T/|J|−DB/|J|T/|J|−DB/|J| planes are obtained.
• The system exhibits the dynamic tricritical point and the critical end points.
• The reentrant behavior and the first-order–order phase transition exist in this system.

The mean-field theory (MFT) is used to study the dynamical response of the mixed spin-1 and spin-3/2 Ising model with Fe4N structure in the presence of a sinusoidal oscillating magnetic field. The Glauber dynamic is used to describe the time evolution of the system and the mean-field dynamic equations are given. Dynamic phase transition diagrams are presented in the T/|J|−h0/|J|T/|J|−h0/|J| plane. The dependence of the phase diagram on single-ion anisotropy strengths is also studied by the MFT. Besides second-order phase transition, lines of first-order phase transition, the dynamic tricritical point and the critical end point are found. In particular, the system exhibits first-order–order phase transitions, which cannot be found in previous studies in the mixed spin-1 and spin-3/2 Ising model using the MFT.