Solid solution magnetic FeNi nanostrand-polymer composites by connecting-coarsening assembly

An approach to assemble high aspect ratio nanostrands consisting of magnetic nanowires and their incorporation in a polymer with the aim of tailoring transparent FeNi nanostrand-PMMA-composites is presented. These nanostrands are controllable in length (<600 mu m) and width (<12 mu m) via process parameters and have an ultra-high aspect ratio (similar to 160). This rapid and universal method provides flexible and transparent magnetic materials with tunable transparency and magnetic attraction force by adjusting the density of nanoparticles in the composite. These composites can be used as a window coating for shielding radio frequency electromagnetic waves while being transparent in the optical range.