Two conventional methods for evaluating interparticle magnetic interactions are applied to magnetic nanoparticle assemblies with various interparticle distances that are controlled by a silica coating. According to Weiss temperatures derived from superparamagnetic response analysis, the mean values of the interparticle magnetic interactions are relatively small and seem to be independent of the interparticle distance. The interaction fields in the first-order reversal curve diagram for narrow interparticle distances are widely distributed. However, the interaction fields disappear when the interparticle distance is sufficiently large. Analysis of these two contrasting results indicates that ferromagnetic-like and antiferromagnetic-like magnetic couplings coexist and cancel each other, as in atomic spin glasses.

两种用于评估粒子间磁性相互作用的传统方法被应用于具有不同粒子间距离的磁性纳米粒子组件，这些粒子间距离由二氧化硅涂层控制。根据来自超顺磁响应分析的 Weiss 温度，粒子间磁相互作用的平均值相对较小，似乎与粒子间距离无关。粒子间距离较窄的一阶反转曲线图中的相互作用场分布广泛。然而，当粒子间距离足够大时，相互作用场就会消失。对这两个对比结果的分析表明，类似铁磁和类似反铁磁的磁耦合共存并相互抵消，就像在原子自旋玻璃中一样。