Patent ID: 9132451
Filing Date: 2015-09-15
Classification: B06B,G10K

Abstract:
1. An apparatus for generating ultra-high frequency sound waves comprising: a ferromagnetic conductive material including a magnetic phonon-gain medium; wherein non-equilibrium electrons having the spin orientation opposite to the direction of magnetization of said magnetic phonon-gain medium are injected into said ferromagnetic material; wherein non-equilibrium magnons are generated in said magnetic phonon-gain medium while said non-equilibrium electrons propagate in said magnetic phonon-gain medium and change the spin orientation from the direction opposite to the direction of magnetization of said magnetic phonon-gain medium to the direction along to the direction of magnetization of said magnetic phonon-gain medium; wherein said ultra-high frequency non-equilibrium phonons are generated in said magnetic phonon-gain medium by non-equilibrium magnons having the magnon velocity exceeding the sound velocity in said magnetic phonon-gain medium; said non-equilibrium magnons having the magnon velocity exceeding the sound velocity in said magnetic phonon-gain medium being generated by said injected non-equilibrium electrons having spin opposite to the direction of magnetization of said magnetic phonon-gain medium; a means for outputting said ultra-high frequency non-equilibrium phonons generated in said magnetic phonon-gain medium by non-equilibrium magnons having the magnon velocity exceeding the sound velocity in said magnetic phonon-gain medium; and a tunnel junction coupled to said ferromagnetic conductive material; wherein electrons are injected into said ferromagnetic conductive material from an external metallic contact by tunneling via said tunnel junction.