The control of magnetic properties at the nanoscale is a current topic of intense research. It was shown that combining both magnetic and plasmonic nanoparticles (NPs) led to the improvement of their magneto-optical signal. In this context, common strategies consist of the design of bimetallic NPs. However, the understanding of the physics leading to the coupling between magnetic and plasmonic NPs is lacking, preventing any significant progress for the development of future photonic devices. In this article, we propose to focus our attention on an efficient and commonly used magnetic metal, cobalt, and evaluate its plasmonic properties at the nanoscale through the use of NP regular arrays, as a potential candidate combining both optical and magnetic functionalities within the same metal. We show that such NPs display plasmonic properties within a large spectral range from the UV to the NIR spectral range, with efficient quality factors, when the inter-particle distance is properly selected. These as-fabricated simple materials could find applications in integrated photonic devices for telecommunications.

中文翻译：

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将钴作为潜在的等离激元候选物引入，在同一纳米结构中结合了光学和磁性功能

在纳米级控制磁性能是当前研究的热点。结果表明，将磁性纳米粒子和等离子体纳米粒子（NPs）结合使用可改善其磁光信号。在这种情况下，通用策略包括双金属NP的设计。然而，缺乏对导致磁性和等离子体NP之间耦合的物理学的理解，这阻碍了未来光子器件的开发的任何重大进展。在本文中，我们建议将注意力集中在一种有效且常用的磁性金属钴上，并通过使用NP正则阵列在纳米级评估其等离子体性能，作为在同一金属中结合光学和磁性功能的潜在候选物金属。我们表明，这样的纳米粒子从紫外到近红外光谱范围内具有大的光谱范围内显示电浆性能，具有高效的质量因素，当适当地选择粒子间距离。这些制成的简单材料可以在电信的集成光子设备中找到应用。