beta-manganese is the only room-temperature-stable crystal structrure of elemental manganese, which remains paramagnetic at all temperatures. This is in stark contrast to both alpha- and gamma-manganese which are both strong itinerant antiferromagnets (IAFM) at 110 K and 500 K respectively. It is commonly thought that the topology of the beta-Mn lattice is the cause of its non-magnetic ground-state - with the lattice supporting geometrical frustration of AFM correlated Mn spins. Despite this, DFT calculations suggest that the magnetic ground state of beta-Mn should actually be ferrimagnetic. Surprisingly, the magnetic spin-dynamics at low temperature (< 1K) has never been studied before, and we now propose to look at the magnetic dynamical properties, using muon spin relaxation. This experiment will take 2 days to complete.