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手性对同心纳米环动态磁化率的影响。

Impact of Chirality on the Dynamic Susceptibility of Concentric Nanotori.

作者信息

Guevara Ulises, Saavedra Eduardo, Pedraja-Rejas Liliana, Garrido-Tamayo Miguel-Angel, Aranzubia Solange, Cisternas Eduardo, Díaz Pablo, Laroze David

机构信息

Vicerrectoría de Investigación y Postgrado, Universidad de La Serena, La Serena 1700000, Chile.

Departamento de Física, Universidad de Santiago de Chile (USACH), Santiago 9170124, Chile.

出版信息

Nanomaterials (Basel). 2025 Jun 26;15(13):989. doi: 10.3390/nano15130989.

DOI:10.3390/nano15130989
PMID:40648696
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12250781/
Abstract

This study investigates the influence of chirality on the dynamic susceptibility of concentric nanotori via micromagnetic simulations. The aim is to analyze the ferromagnetic resonance characteristics of coupled nanotori structures and compare them across various ring separation distances, thus providing an insight into how vortex configurations with identical or differing chiralities affect their dynamic properties. We analyze the energetic differences between the two vortex configurations and find them to be negligible; however, these minor differences suffice to explain the significant discrepancies in the demagnetization field observed between the nanotori. We examine the dynamic susceptibility spectrum and the spatial localization of the ferromagnetic resonance modes for different nanotori separations. Our findings demonstrate that the resonant oscillation frequencies are significantly influenced by the magnetostatic interactions between the nanotori, which can be effectively modulated by varying the distance between them. Furthermore, for smaller separations, the frequency peaks in the dynamic susceptibility markedly diverge between the two vortex configurations, demonstrating that the observed differences in the demagnetization field between the rings strongly influence the frequency response. In summary, our results indicate that both the inter-ring distance and the vortex configuration play a crucial role in determining the frequency response of the system.

摘要

本研究通过微磁模拟研究了手性对同心纳米环面动态磁化率的影响。目的是分析耦合纳米环面结构的铁磁共振特性，并在不同的环间距下进行比较，从而深入了解具有相同或不同手性的涡旋构型如何影响其动态特性。我们分析了两种涡旋构型之间的能量差异，发现它们可以忽略不计；然而，这些微小差异足以解释纳米环面之间观察到的退磁场的显著差异。我们研究了不同纳米环面间距下的动态磁化率谱和铁磁共振模式的空间定位。我们的研究结果表明，共振振荡频率受到纳米环面之间静磁相互作用的显著影响，通过改变它们之间的距离可以有效地调节这种相互作用。此外，对于较小的间距，两种涡旋构型的动态磁化率频率峰值明显不同，表明环之间观察到的退磁场差异强烈影响频率响应。总之，我们的结果表明，环间距和涡旋构型在决定系统的频率响应方面都起着关键作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b83d/12250781/193596c0a7d2/nanomaterials-15-00989-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b83d/12250781/6ae0e87f8533/nanomaterials-15-00989-g005.jpg
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