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首页> 外文期刊>Physical review >Interaction effects on microwave-assisted switching of Ni_(80)Fe_(20) nanowires in densely packed arrays
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Interaction effects on microwave-assisted switching of Ni_(80)Fe_(20) nanowires in densely packed arrays

机译：相互作用对密集堆积阵列中Ni_（80）Fe_（20）纳米线的微波辅助转换的影响

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摘要

We perform broadband microwave absorption spectroscopy and explore the switching behavior of 300-nm-wide and 20-nm-thick Ni_(80)Fe_(20) nanowires under irradiation of a magnetic rf field. In particular, we investigate two arrays where the nanowires exhibit a different edge-to-edge separation, a= 100 and 700 nm. In the arrays we observe microwave-assisted switching (MAS). The MAS process with a resonant behavior near 6 GHz is attributed to the excitation of a confined Damon-Eshbach-type mode. Dipolar interactions between nanowires are found to decrease the optimum frequency for MAS and to increase the switching efficiency for the small separation a. The observed characteristics are substantiated by model considerations. We propose a modification of the previously introduced analytical demagnetization factors of an individual thin wire and incorporate the effect of dipolar interactions occurring in the array. The approach explains the dependence of the MAS-relevant eigenmode on the edge-to-edge separation a. MAS is also found to narrow the switching field distribution of the nanowire array.
机译：我们执行宽带微波吸收光谱法，并探讨了在射频磁场的作用下300nm宽和20nm厚的Ni_（80）Fe_（20）纳米线的开关行为。特别是，我们研究了两个阵列，其中纳米线表现出不同的边到边间隔，a = 100和700 nm。在阵列中，我们观察到微波辅助开关（MAS）。共振行为接近6 GHz的MAS过程归因于受限的Damon-Eshbach型模式的激发。发现纳米线之间的偶极相互作用降低了MAS的最佳频率，并增加了小间隔a的开关效率。观察到的特征通过模型考虑得到证实。我们建议对单个细线先前引入的分析消磁因子进行修改，并考虑阵列中发生的偶极相互作用的影响。该方法说明了与MAS相关的本征模对边到边分离a的依赖性。还发现MAS使纳米线阵列的开关场分布变窄。

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