In 1845, Michael Faraday discovered that light passing through a transparent medium can be altered with an externally applied magnetic field. It is not surprising, given the science and engineering involved, that the ideal medium for observing the Faraday effect and the process by which it is made have only recently been developed. This article explains how magneto-optical sensors make use of advanced materials and processes to harness the Faraday effect, making it possible to see magnetic fields and domains with detailed resolution and instantly obtain flux density measurements over the surface of magnetic materials and magnetized parts.

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