基于一阶反转曲线三维Ni反点阵列磁学特性研究

First-Order Reversal Curve Study on the Magnetic Properties of Nickel Three-Dimensional Antidot Arrays

采用一阶反转曲线方法研究了三维Ni反点阵列中的磁偶极相互作用和磁化反转行为。以自组装聚苯乙烯球为胶体晶体模板,采用电化学沉积法制备出有序的三维Ni反点阵列。样品的孔径尺寸均为大约500 nm,厚度依次从0.3μm到1.2μm。通过一阶反转曲线方法分析表明,随着样品厚度的增加,磁偶极相互作用减小,矫顽力分布变窄。这主要是由于随着厚度的增加,磁偶极相互作用向交换耦合作用转变的结果。

The investigation on the dipolar interactions and magnetization reversal in Ni three-Dimensional antidot arrays(3 DAAs)using the first-order reversal curve(FORC)method.Ordered Ni 3 DAAs were fabricated by electrochemical deposition into colloidal crystal templates of self-assembled polystyrene spheres.The samples have the same pore size of about500 nm but different thicknesses,ranging from 0.3μm to 1.2μm.The FORC diagram analysis reveals a decrease in the magnetic dipolar interaction with the increasing sample thickness,as well as a decrease in the coercivity distribution.This results from the transition from the dipolar interaction to the exchange coupling as the thickness increases.