The discovery and experiments on the acousto-magnetic effect are introduced
which confirmed that the acousto-magnetic effect is a universal physicalphenomenon of the ferromagnetic materials. For acousto-magnetic conversion under demagnethation state more intensive acoustic wave is required. When a D. C.bias magnetic field is applied on the surface of the sample
even a weak acousticwave can produce much stronger acousto-magnetic conversion. In addition
themechanism of the acousto-magnetic coversion is analyzed briefly.