IMPULSIVE ELECTROMAGNETIC-ACOUSTIC CONVERSION OF THE HIGHER HARMONICSOF SURFACE-WAVES IN FERROMAGNETIC MATERIALS

An experimental study is made of impulsive electromagnetic-acoustic co nversion of the higher harmonics of surface waves associated with vert ical and horizontal polarization in ferromagnetic materials. It is sho wn that in contrast to the resonance method, efficiency in the convers ion of the second harmonic may reach tens of percent of the value for the first harmonic. The equivalent efficiency for the third harmonic i s several percent. A thermodynamic approach is used to explain all of the experimentally observed features of the electromagnetic-acoustic c onversion of harmonics of acoustic surface waves.