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We report spatially and temporally resolved measurements of magnetic fieldsgenerated by petawatt laser-solid interactions with high spatial resolution,using optical polarimetry. The polarimetric measurements map the megagaussmagnetic field profiles generated by the fast electron currents at the targetrear. The magnetic fields at the rear of a 50 $\mu$m thick aluminum targetexhibit distinct and unambiguous signatures of electron beam filamentation.These results are corroborated by hybrid simulations.

Micron-Scale Mapping of Megagauss Magnetic Fields in Petawatt Laser-Solid Interactions