Faraday rotation spectroscopy (FRS) is a powerful new tool that enables scientists to measure extremely weak magnetic fields. This new technique has been developed by researchers at the University of Oxford and has numerous potential applications in a range of fields, from medical diagnostics to astrophysics.

FRS works by exploiting the Faraday effect - the rotation of the plane of polarization of light when it passes through a magnetic field. When the light is passed through a gas or liquid sample containing a magnetic field, the polarization of the light is rotated by an amount proportional to the magnetic field strength. By measuring this rotation, scientists can calculate the strength of the field at a given location. This makes FRS an incredibly sensitive tool for detecting extremely weak magnetic fields.

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source: Phys.org