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Low-frequency polarisation observations of pulsars, facilitated bynext-generation radio telescopes, provide powerful probes of astrophysicalplasmas that span many orders of magnitude in magnetic field strength andscale: from pulsar magnetospheres to intervening magneto-ionic plasmasincluding the ISM and the ionosphere. Pulsar magnetospheres with teragaussfield strengths can be explored through their numerous emission phenomenaacross multiple frequencies, the mechanism behind which remains elusive.Precise dispersion and Faraday rotation measurements towards a large number ofpulsars probe the three-dimensional large-scale (and eventually small-scale)structure of the Galactic magnetic field, which plays a role in manyastrophysical processes, but is not yet well understood, especially towards theGalactic halo. We describe some results and ongoing work from the Low FrequencyArray (LOFAR) and the Murchison Widefield Array (MWA) radio telescopes in theseareas. These and other pathfinder and precursor telescopes have reinvigoratedlow-frequency science and build towards the Square Kilometre Array (SKA), whichwill make significant advancements in studies of astrophysical magnetic fieldsin the next 50 years.

Studying Magnetic Fields using Low-frequency Pulsar Observations