Abstract

We present the study of magnetism of dimer ensemble deposited on a non-magnetic conducting substrate. The dimers consist of ions with spin 1/2 and have a random size. The magnetic ions are coupled by RKKY-interaction with random energy value. We consider two interaction models. The first assumes that dimer coupling energy has a Gaussian distribution, and the second model is based on a log-normal distribution of dimer size. The magnetization and susceptibility are evaluated from the exact solution for dimer energy and eigenstates. We show that the average exchange value and its dispersion have a strong effect on the system properties. The magnetic saturation exists under strong magnetic fields. High-temperature leads to the Curie’s law for susceptibility. The saturation magnetization of system with ferromagnetic coupling lowers, while the antiferromagnetic dimer ensemble can have non-zero magnetization under the strong magnetic field. It is determined by the dispersion of exchange energy.

GraphicAbstract

中文翻译：

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具有随机交换能量的二聚体集合体的磁性

摘要

我们目前对沉积在非磁性导电基底上的二聚体团合磁性的研究。二聚体由自旋为1/2的离子组成，大小随机。磁性离子通过RKKY相互作用与随机能量值耦合。我们考虑两个交互模型。第一个假设二聚体耦合能具有高斯分布，第二个模型基于二聚体尺寸的对数正态分布。从二聚体能量和本征态的精确解中评估了磁化强度和磁化率。我们表明，平均交换价值及其分散对系统性能有很大的影响。磁饱和存在于强磁场下。高温导致居里定律的敏感性。具有铁磁耦合的系统的饱和磁化强度降低，反铁磁二聚体团在强磁场下具有非零磁化强度。它取决于交换能量的分散。

图形摘要