We propose to characterize the two magnetic transitions in Nd0.75Gd0.25Rh3B2 and study the spin dynamics and field induced domain rotation via zero field (ZF) and longitudinal field μSR measurements. The ZF measurements have the potential to reveal whether there is a spontaneous reversal of local magnetization at the second transition at the lower temperature. The in-field measurements at low fields ( H ~ 100 Oe) are expected to unravel the details of domain rotations (i) at the first compensation temperature, (ii) at the the second transition and (iii) at the second compensation temperature. At much higher fields ( H> 10 kOe), the no reversals in the domain (local magnetization) are anticipated, however, the musr experiment can throw up a surprise at the local level. We propose to use the HIFI spectrometer to carry out ZF and LF musr investigations on Nd0.77Gd0.25Rh3B2.