Spin and phonon spin traveling wave parametric amplifiers and spin wave delay lines

Claim 1

A SPIN TRAVELING PARAMETRIC AMPLIFIER COMPRISING: (A) A FERROMAGNETIC ROD OF HIGH Q, LOW LOSS DIELECTRIC MATERIAL, SAID ROD HAVING ENTRANCE AND EXIT END REGIONS, (B) MICROWAVE TRANSMISSION MEANS COUPLED TO THE END REGIONS OF SAID ROD FOR APPLYING TO SAID ENTRANCE REGION A SIGNAL WAVE IN THE FORM OF R.-F. ELECTROMAGNETIC ENERGY AND FOR RECEIVING FROM AID EXIT REGION SAID SIGNAL AFTER BEING AMPLIFIED BY A TRANSVERSAL OF SAID ROD, (C) MEANS FOR PROVIDING A NONUNIFORM INTERNAL D.-C. MAGNETIZING FIELD TO SAID ROD HAVING A MAGNITUDE IN THE VICINITY OF SAID ENTRANCE AND EXIT REGIONS WHICH SUPPORTS EXCITATION OF THE UNIFORM PRECESSIONAL SPIN MODE, THE MAGNITUDE OF SAID FIELD BEING REDUCED TO A LOWER VALUE AT THE CENTRAL REGION OF THE ROD FOR SUPPORTING EXCITATION OF SHORT WAVELENGTH SPIN-WAVES OF FREQUENCY WS AND PHASE CONSTANT BS PROPAGATING IN A DIRECTION FROM SAID ENTRANCE REGION TO SAID EXIT REGION, SAID ELECTROMAGNETIC ENERGY BEING SUCCESSIVELY COUPLED TO SAID SPIN-WAVES AND BACK TO ELECTROMAGNETIC ENERGY, (D) A HELICAL CONDUCTOR TIGHTLY WOUND ABOUT SAID ROD AND (E) MEANS FOR APPLYING TO SAID CONDUCTOR A PUMP WAVE IN THE FORM OF R.-F. ELECTROMAGNETIC ENERGY OF FREQUENCY WP AND PHASE CONSTANT BP PROPAGATING IN A DIRECTION ALONG THAT OF SAID SPIN WAVE PROPAGATION, THE MAGNETIC FIELD OF THE PUMP WAVE BEING COUPLED TO THE SPIN WAVES WITH THE EXISTING RELATIONSHIPS WP=WS+WI AND BP=BS+BI, WHERE WI AND BI ARE THE FREQUENCY AND PHASE CONSTANT OF THE IDLER WAVE, WHEREBY PARAMETRIC INTERACTION IS PROVIDED BETWEEN THE PUMP AND SIGNAL WAVES.