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<p>We employed the Monte Carlo (MC) method and constructed the mixed-spin (5/2, 1/2) ferrimagnetic Ising model for the purpose of investigating the influences of various parameters such as crystal field <i>D</i>, exchange couplings <i>J</i><sub><i>ab</i></sub> and <i>J</i><sub><i>b</i></sub>, the amplitude of the time-oscillating magnetic field <i>h</i><sub><i>0</i></sub>, bias field <i>h</i><sub><i>b</i></sub>, and angular frequency of time-oscillating magnetic field <i>ω</i> on the dynamic magnetic characteristics and magnetocaloric effects of the metal-coordinated polymer [Dy<sub>2</sub>Cu<sub>2</sub>]<sub>n</sub>. It was found that the decrease of |<i>D</i>|, |<i>J</i><sub><i>ab</i></sub>|, <i>J</i><sub><i>b</i></sub>, and <i>h</i><sub><i>0</i></sub> or the increase of <i>ω</i> would lead to the increase of the compensation temperature <i>T</i><sub><i>comp</i></sub>. For example, when <i>J</i><sub><i>ab</i></sub> = −0.1, <i>T</i><sub><i>comp</i></sub> = 0.1 is found in the system. Interestingly, the double compensation temperatures occur under certain physical parameters. When <i>J</i><sub><i>b</i></sub> = 1.1, the double compensation points are observed. Small values of |<i>D</i>|, |<i>J</i><sub><i>ab</i></sub>|, <i>J</i><sub><i>b</i></sub>, and <i>ω,</i> or large values of <i>h</i><sub><i>0</i></sub> and <i>h</i><sub><i>b</i></sub> can improve the relative cooling power (RCP) of the system. For instance, when <i>J</i><sub><i>b</i></sub> increases progressively from 0.1 to 4, the RCP decreases from 0.668 to 0.545. Similarly, as <i>h</i><sub><i>0</i></sub> ascends gradually from 0.1 to 2, the value of RCP rises from 0.043 to 1.08.</p>

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Exploration of dynamic magnetic characteristics and magnetocaloric effects of the metal-coordinated polymer [Dy2Cu2]n

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Dan Lv,
  • Hui-yi Li,
  • Bo-chen Li,
  • Gong-zhao Liu

摘要

We employed the Monte Carlo (MC) method and constructed the mixed-spin (5/2, 1/2) ferrimagnetic Ising model for the purpose of investigating the influences of various parameters such as crystal field D, exchange couplings Jab and Jb, the amplitude of the time-oscillating magnetic field h0, bias field hb, and angular frequency of time-oscillating magnetic field ω on the dynamic magnetic characteristics and magnetocaloric effects of the metal-coordinated polymer [Dy2Cu2]n. It was found that the decrease of |D|, |Jab|, Jb, and h0 or the increase of ω would lead to the increase of the compensation temperature Tcomp. For example, when Jab = −0.1, Tcomp = 0.1 is found in the system. Interestingly, the double compensation temperatures occur under certain physical parameters. When Jb = 1.1, the double compensation points are observed. Small values of |D|, |Jab|, Jb, and ω, or large values of h0 and hb can improve the relative cooling power (RCP) of the system. For instance, when Jb increases progressively from 0.1 to 4, the RCP decreases from 0.668 to 0.545. Similarly, as h0 ascends gradually from 0.1 to 2, the value of RCP rises from 0.043 to 1.08.