METHOD OF CONTINUOUS AMPLIFICATION OF SURFACE AND TRANSVERSE COUPLED ELASTIC-SPIN WAVES

摘要

A method of continuous amplification of elastic-spin waves with use of a circuit of a slab ferromagnetic crystal on which a semi-conductor layer is superposed comprises generating a propagating waves in the slab, and applying a direct voltage to the semi-conductor layer to produce a current of drifting electrons in the layer, inducing an elastic wave in the layer through the propagating wave in the slab which produces a piezoelectric field in the layer, modulating the current of drifting electrons with the piezoelectric field, amplifying the elastic wave in the semi-conductor layer and in the slab when the drift velocity of the drifting electron reaches a critical velocity, and applying a constant magnetic field to the circuit to produce a spin-acoustic resonance, the elastic wave in the ferromagnetic slab amplifying the spin wave in the slab through spin-elastic coupling.