| 摘要 |
<p>An apparatus for generating ultra-high frequency sound waves with frequencies between (1 GHz -10 GHz) is proposed. The apparatus comprises a magnetic phonon-gain medium (116, 124, 134) configured to generate high frequency non-equilibrium phonons (70) by non- equilibrium magnons (68) having the magnon velocity exceeding the sound velocity in the magnetic phonon-gain medium. The non- equilibrium magnons having the magnon velocity exceeding the sound velocity in the magnetic phonon-gain medium are generated by injected non-equilibrium electrons having spin opposite to the direction of magnetization of the magnetic phonon-gain medium. The apparatus further comprises a means (118, 126, 136) for outputting the ultra-high frequency non-equilibrium phonons.</p> |
