The Synergetic Thermo-Acoustic and Magneto-Acoustic Emitting from Free-standing Nano-Thin Film

In this paper, the mixed thermo-acoustic and magneto-acoustic generations are synergistically discovered with respect to wave stability. Different from the thermo-acoustical nano-thin film devices, the present acoustical emitting device derives from both of the thermo-acoustical and the structural acoustical radiation. Moreover, the thermal and magnetic sounding production share the same voicing unit as well as the same simple harmonic current input. Due to the electric power excitation for thermo-acoustics and electro-magnetic loading for magneto-acoustics, the frequencies and wave stability response of the acoustic wave are apparently different as that in the steady magnetic field. The dynamic magnetic field with the same frequency as the electric current is introduced to correct the inharmonious frequency. As the thermo-acoustics and magneto-acoustics share the same velocity boundary condition, the two effects are partly coupled and affected. The characteristics of the mixed thermo-acoustics and magneto-acoustics are established and discussed. The sound pressure level is significantly improved compared with the single thermo-acoustical system.