Abstract
In this study, we discussed the optical properties (Faraday rotation, transmittance and Merit factor) of two samples of magnetic liquids synthesized by co-precipitation and an additional hydrothermal synthesis of cobalt ferrite (CoFe2O4) developed according to the protocol developed by R. Massart at the PHENIX laboratory at Pierre and Marie Curie University in the form of ferrofluids. The measurements were carried out using the spectral polarimetric bench (400-1600 nm). The materials did not meet the standard and did not allow a good Faraday rotation due to their preparation conditions. Cobalt ferrite is a hard ferrimagnetic material, having many important applications in the field of magnetic storage and spintronics. The results show a very high spectral Faraday rotation in the Telecom range (1550 nm) with good transparency in the infrared of the transmittance spectra and a strong merit factor around 1550 nm, with a value of the order of 11°. For a cobalt ferrite magnetic liquid obtained hydrothermally.
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