论文标题
Stoner-Wohlfarth模型中的基本不平等现象
Fundamental inequalities in the Stoner-Wohlfarth model
论文作者
论文摘要
我们报告了Stoner-Wohlfarth模型中的两个基本不平等现象。具体而言，我们研究了用Stoner-Wohlfarth方法描述的系统中初始磁敏感性的理论极限。我们还发现了低场式磁化的分析解决方案，并在这种理想的stoner-wohlfarth系统中获得单轴各向异性常数的边界值。我们超越并引入了一种一般的平均场理论，用于相互作用的stoner-wohlfarth样系统，从而估算了系统内部的偶极和交换相互作用如何影响初始磁敏感性。通过从基本不平等的简单见解，即理想的stoner-wohlfarth系统的磁敏感性，我们表明其违规是纳米颗粒之间存在交换相互作用的签名，这是相互作用的stoner-wohlfarth类似系统中存在的。
We report two fundamental inequalities in the Stoner-Wohlfarth model. Specifically, we investigate the theoretical limit for the initial magnetic susceptibility in a system described by the Stoner-Wohlfarth approach. We also find analytical solutions for the magnetization in the low-field regime and obtain the borderline value for the uniaxial anisotropy constant in such an ideal Stoner-Wohlfarth system. We go beyond and introduce a general mean-field theory for interacting Stoner-Wohlfarth-like systems, thus estimating how the initial magnetic susceptibility is affected by the dipolar and exchange interactions inside the system. By means of a simple insight from a fundamental inequality for the magnetic susceptibility of an ideal Stoner-Wohlfarth system, we show its violation is a signature of the existence of exchange interactions between nanoparticles in an interacting Stoner-Wohlfarth-like system.
