Abstract
Within this work the utilization of nanostructured silicon as host material for filling with various magnetic nanostructures is reviewed whereas the magnetic and optical properties of the gained composite systems are elucidated. The metal filling of the pores is mainly performed by electroless deposition or by electrodeposition which is discussed by means of some examples. Furthermore two different types of porous silicon (PSi) morphology are used for the deposition procedure. On the one hand microporous silicon offering luminescence in the visible range is utilized as template material. It offers a branched morphology with a structure size between 2 and 5 nm. In this case not only the magnetic response is investigated but also the influence of the metal filling on the optical properties. On the other hand mesoporous and macroporous silicon in it’s low pore regime is employed which offers straight pores with diameters up to 90 nm. In this case the magnetic response strongly depends on the size, the geometry and the spatial distribution of the metal deposits within the pores. A crucial role plays also the morphology of the porous silicon, especially the distance between adjacent pores which is an important parameter regarding magnetic interactions.
Highlights
Porous silicon can be fabricated by various methods such as anodization [1], stain etching [2], metal assisted etching [3], galvanic etching [4], reactive ion etching [5], or laser ablation [6]
The obtained morphology reaches from microporous silicon offering a structure size between 2 and 5 nm to mesoporous silicon with pore diameters up to 50 nm and further to macroporous silicon with pores up to a few micrometers [7]
Considering the photoluminescence of microporous silicon, the emission can be tuned due to the structure size in the region from the near-infrared to the ultraviolet in the case of a hydrogen passivated surface
Summary
Within this work the utilization of nanostructured silicon as host material for filling with various magnetic nanostructures is reviewed whereas the magnetic and optical properties of the gained composite systems are elucidated. On the one hand microporous silicon offering luminescence in the visible range is utilized as template material. It offers a branched morphology with a structure size between 2 and 5 nm. In this case the magnetic response is investigated and the influence of the metal filling on the optical properties. On the other hand mesoporous and macroporous silicon in it’s low pore regime is employed which offers straight pores with diameters up to 90 nm In this case the magnetic response strongly depends on the size, the geometry and the spatial distribution of the metal deposits within the pores.
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