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<p>The present Monte Carlo study employed a ferrimagnetic mixed-spin Ising model to explore the magnetic properties of a kekulene-like structure with alternate multilayers. We investigated the temperature dependence of the magnetization, magnetic susceptibility, energy, specific heat, and entropy for kekulene-like structure. <i>D</i><sub><i>a</i></sub> and <i>D</i><sub><i>b</i></sub> represent the crystal fields of sublattice a and b, respectively. First, we used the ground state phase diagram to show all possible spin configurations. <i>D</i><sub><i>a</i></sub> causes the system to appear in 8 spin configurations. In the study of magnetization, changing <i>D</i><sub><i>b</i></sub> and <i>J</i><sub><i>ab</i></sub> causes the magnetization to exhibit five saturation values. In addition, we found compensation points. The study of phase diagrams illustrates that decreasing exchange coupling and increasing crystal field can improve the compensation temperature <i>T</i><sub><i>comp</i></sub> and phase transition temperature <i>T</i><sub><i>C</i></sub>. <i>T</i><sub><i>C</i></sub> is more susceptible to the change of <i>D</i><sub><i>b</i></sub> and the exchange coupling <i>J</i><sub><i>ab</i></sub>. In addition, it can be observed that the triple-loop hysteresis characteristics frequently manifested.</p>

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Compensation temperatures and hysteresis loops in a kekulene with alternate multilayer

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Xiao-Han Zhang,
  • Ji Liang,
  • Wei Wang,
  • Bo-Chen Li

摘要

The present Monte Carlo study employed a ferrimagnetic mixed-spin Ising model to explore the magnetic properties of a kekulene-like structure with alternate multilayers. We investigated the temperature dependence of the magnetization, magnetic susceptibility, energy, specific heat, and entropy for kekulene-like structure. Da and Db represent the crystal fields of sublattice a and b, respectively. First, we used the ground state phase diagram to show all possible spin configurations. Da causes the system to appear in 8 spin configurations. In the study of magnetization, changing Db and Jab causes the magnetization to exhibit five saturation values. In addition, we found compensation points. The study of phase diagrams illustrates that decreasing exchange coupling and increasing crystal field can improve the compensation temperature Tcomp and phase transition temperature TC. TC is more susceptible to the change of Db and the exchange coupling Jab. In addition, it can be observed that the triple-loop hysteresis characteristics frequently manifested.