Fabrication 3-dimensional ferromagnetic-plasmonic nanostructures and the application as high-efficiency magnetooptical materials

研究了a- fe2o3掺杂透明玻璃在红外飞秒激光照射和退火后的光学、磁性和磁光性质。与制备的样品相比，辐照玻璃的室温饱和磁化强度有所提高，这是由于铁磁性铁氧体纳米颗粒（NPs）的析出。通过在等离子体金属前驱体中添加进一步的掺杂剂，辐照和热退火后，Au或Al NPs与铁氧体NPs在密闭区域内有空间选择性地析出。在共掺杂Al的情况下，磁光法拉第效应增强，并表现出明显的负峰，这是由于铁氧体NPs的铁磁性与Al NPs的局部表面等离子体共振之间的耦合。

Optical, magnetic, and magneto-optical properties have been investigated for the a-Fe2O3-doped transparent glasses irradiated with an infrared femtosecond laser and subsequently annealed. The values of the saturation magnetization at room temperature for the irradiated glasses were increased compared with the as-prepared samples, which is due to the precipitation of the ferrimagnetic ferrite nanoparticles (NPs). By adding further dopants as precursors of plasmonic metals, Au or Al NPs were space-selectively precipitated together with the ferrite NPs in a confined region after irradiation and thermal annealing. In the case of the glass codoped with Al, magneto-optical Faraday effect was enhanced and exhibited a negative distinct peak ascribed to a coupling between the ferrimagnetism of ferrite NPs and the localized surface plasmon resonance of Al NPs.