Moiseienko V. Non-resonant wave front reversal of spin waves and correlation data processing in yttrium-iron garnet films.

A non-resonant WFR of SW (signal frequency differs from the half of pumping frequency) in YIG films induced by a parallel parametric pumping is proposed and experimentally studied. A possibility of spectral analysis of input signals and its microwave filtering using non-resonant WFR of backward volume magnetostatic waves (BVMSW) in YIG films is shown. A possibility of separation of two microwave signals simultaneously acting on the detector using non-resonant WFR of BVMSW is proven experimentally. A parametric frequency conversion of surface magnetostatic waves (SMSW) signal frequency to an intermediate signal frequency controlled by a magnetic field as a result of the WFR in a non-reciprocal media is discovered. Several designs of microwave correlators based on the WFR phenomenon are proposed and their microwave properties are investigated. Microwave correlation receiver based on the parametric interaction of SW with a parallel parametric pumping is experimentally investigated. An application of the WFR of SW for the creation of time-reversal signal pulses is proposed. Microwave properties of the correlator in the presence of noise are studied using the non-resonant WFR of SW. A possibility of the creation of correlator having only one antenna for both input and output signals is considered. Also the correlation processing of input signals having variable frequency is analyzed. A method of MSW spectra study based on the application of the correlator is proposed. An effective numerical model for calculating time profiles of correlation signal is developed. The obtained results can be used for the development of microwave analog data processing devices based on magnetic films.