The spontaneous magnetizations M (T) of the ferromagnetic glasses (Fe40P14B6, Fe75P15C10 and Fe80P16C3B1) have been measured by 57Fe Mössbauer spectroscopy. At low temperatures, the change of M (T) varies as B3/2(T/Tc)3/2, characteristic of ferromagnetic spin waves with an anomalously large value of B3/2. For T close to Tc, M (T) varies as a power law with critical exponent β close to 1/3.