Ferrofluid thin films as optical gaussmeters proposed for field and magnetic moment sensing
Source abstract
Abstract
Ferrofluids belonging to the series, NixFe1-xFe2O4 and ZnxFe1-xFe2O4, were synthesized using cold co-precipitation. Liquid films of these ferrofluids were prepared by encapsulating the ferrofluids in between two optically smooth and ultrasonically cleaned glass plates. Magnetic field induced laser transmission through these ferrofluid films has been investigated. Magnetic field values can be calibrated in terms of output laser power in the low field region in which the variation is linear. This set up can be used as a cheap optical gaussmeter in the low field regime. Using the same set-up, the saturation magnetization of the sample used can also be calculated with a sample that is pre-characterized. Hence both magnetization of the sample, as well as applied magnetic field can be sensed and calculated with a precalibrated sample.
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Research context
OpenAlex topics: Characterization and Applications of Magnetic Nanoparticles · Magneto-Optical Properties and Applications · Surface Roughness and Optical Measurements
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