Abstract
The designs and fabrications of magnetic nanostructures that are intended to enhance and tailor magneto-optical rotations have been the subject of intense interest for ultrasensitive biosensor and communication applications. In this research study, flexibly regulated longitudinal magneto-optical Kerr effects (L-MOKE) were investigated in CoFeB (Co40Fe40B20) nanostructure arrays patterned on the single pass anodic aluminum oxide template (AAO/Al) using a magnetron sputtering method, showing a great nano-cavity enhancement effect. The optical and L-MOKE properties of the as-prepared nanostructural thin films on the AAO/Al substrate are significantly distinguished from those of the CoFeB granular film on the Al substrate, exhibiting a distinct resonance. The L-MOKE peak gives a clear blue-shift with the increase of the pore diameter of the AAO template, which can be elucidated by the pure optical interference theory. By optimizing the pore diameter of the AAO template, the Kerr rotation of the CoFeB nanoporous arrays can reach 0.153 degree, which is approximately 1.65 times higher than that of the CoFeB granular film. The proposed nanostructural thin film could be potentially applied as highly accurate magneto-optical sensors, conveying new pathways in the construction of advanced magneto-optical devices for optoelectronic and magneto-optical applications.
Published Version
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