CIC nanoGUNE, E-20018 Donostia - San Sebastian, Spain.
Nanoscale. 2018 Oct 21;10(39):18672-18679. doi: 10.1039/c8nr03201g. Epub 2018 Sep 28.
The combination of magnetic and plasmonic materials and their nanostructurization have revealed a prominent pathway to develop novel photonic materials for the active control of the light polarization using a magnetic field. Until now, physical growth methods have been the only exploitable approach to prepare these types of nanostructures. Here, we demonstrate the chemical synthesis of magneto-plasmonic core/shell nanocrystals with enhanced magnetic control of optical properties comparable to the best results reported for nanostructure growth by physical methods. Ag/FeCo core/shell nanocrystals were synthesized using a combination of hot injection and polyol approaches, demonstrating that the well-defined structures of both components, their interface and the optimized morphology, where the plasmonic and magnetic components are placed in the core and the shell regions, are responsible for the observed large enhancement of magnetic control of light polarization. Therefore, there is a possibility to develop tunable magneto-optical materials from hybrid magneto-plasmonic structures synthesized by chemical methods.
磁性和等离子体材料的组合及其纳米结构化揭示了一种新途径，可以开发新型光子材料，通过磁场对光偏振进行主动控制。到目前为止，物理生长方法一直是制备这些类型纳米结构的唯一可行方法。在这里，我们展示了磁等离子体核/壳纳米晶体的化学合成，其光学性质的磁控制得到了增强，可与通过物理方法生长纳米结构所报道的最佳结果相媲美。使用热注入和多元醇方法合成了 Ag/FeCo 核/壳纳米晶体，证明了两个组成部分的明确结构、它们的界面和优化的形态（其中等离子体和磁性组件分别位于核和壳区域）是导致观察到的光偏振的磁控制大大增强的原因。因此，有可能从通过化学方法合成的混合磁等离子体结构开发可调谐的磁光材料。
