Abstract The emergence of novel effects such as giant magnetoresistance and magnetothermopower in single nanowires (NWs) and multilayered NWs (MNWs) makes it necessary to comprehensively understand and distinguish between their magnetic behavior and subtle characteristics. Herein, experimental fine-tuning of both ferromagnetic and non-magnetic segment thicknesses in 50 nm diameter FeNi/Cu MNW arrays from TFeNi = 25–260 nm and TCu = 2–23 nm, respectively, enables us to find the threshold TCu, below which the coercive field behavior of rod-like MNW systems magnetically saturated parallel to their long axis shows a continuous decreasing trend, which is similar to that of single NWs with integrated structure. This is in turn accompanied with enhanced magnetizing- and demagnetizing-type interactions as evidenced by first-order reversal curve (FORC) analysis. FORC measurements of disk-shaped to rod-like FeNi segments also indicate a transition from dipolar to monopolar interaction regime which coincides with continuous increasing and decreasing trends of the parallel coercivity and magnetization reversibility, being in agreement with typical MNW magnetic characteristics. Our results on the variation behavior of interaction field distribution as a function of TCu allows for evaluating the credibility of the theoretical approach proposed in the literature on the interaction field, providing threshold conditions based on the segment aspect ratio of MNW arrays.

中文翻译：

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通过微调段厚度捕获 FeNi/Cu 纳米线阵列中平行矫顽力的双重行为

摘要 单纳米线（NWs）和多层纳米线（MNWs）中巨磁电阻和磁热能等新效应的出现使得有必要全面了解和区分它们的磁性行为和细微特征。在此，分别从 TFeNi = 25-260 nm 和 TCu = 2-23 nm 对 50 nm 直径 FeNi/Cu MNW 阵列中的铁磁和非磁段厚度进行实验微调，使我们能够找到阈值 TCu，如下其中平行于其长轴磁饱和的棒状MNW系统的矫顽场行为显示出持续下降的趋势，这与具有集成结构的单个NW相似。这反过来又伴随着增强的磁化和退磁型相互作用，如一阶反转曲线 (FORC) 分析所证明的那样。盘状到棒状 FeNi 段的 FORC 测量也表明从偶极到单极相互作用状态的转变，这与平行矫顽力和磁化可逆性的连续增加和减少趋势一致，与典型的 MNW 磁特性一致。我们关于作为 TCu 函数的相互作用场分布的变化行为的结果允许评估在相互作用场的文献中提出的理论方法的可信度，提供基于 MNW 阵列段纵横比的阈值条件。盘状到棒状 FeNi 段的 FORC 测量也表明从偶极到单极相互作用状态的转变，这与平行矫顽力和磁化可逆性的连续增加和减少趋势一致，与典型的 MNW 磁特性一致。我们关于作为 TCu 函数的相互作用场分布的变化行为的结果允许评估在相互作用场的文献中提出的理论方法的可信度，提供基于 MNW 阵列段纵横比的阈值条件。盘状到棒状 FeNi 段的 FORC 测量也表明从偶极到单极相互作用状态的转变，这与平行矫顽力和磁化可逆性的连续增加和减少趋势一致，与典型的 MNW 磁特性一致。我们关于作为 TCu 函数的相互作用场分布的变化行为的结果允许评估在相互作用场的文献中提出的理论方法的可信度，提供基于 MNW 阵列段纵横比的阈值条件。