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Additionally, NdFeB permanent magnets have been manufactured for roughly 40 years.
Yuan Cao et al, Dual mid-infrared wavelength Faraday rotation spectroscopy NO sensor based on NdFeB ring magnet array, Sensors and Actuators B: ChemicalDOI: 10.1016/j.
Source: https://phys.org/news/2023-05-faraday-rotation-spectroscopy-sensor-enables.html