Cloning and trapping of magnetostatic spin-wave pulses by parametric pumping

Magnetostatic backward volume spin-wave SW pulses have been cloned and trapped through the use of multiple, properly timed, parametric pumping PP pulses. The experiment was done with 30-ns-wide pulses at 5 GHz in a 7.1m-thick yttrium iron garnet film. Well-timed, large-area, high-power, 2-ns-wide microwave pulses at 10 GHz were used to pump the SW pulses. The interaction between the initial SW and PP pulses created a mirror-image, time-reversed idle SW pulse with the same frequency as, but opposite wave vector to, the initial SW pulse. Additional properly timed PP pulses continued the reversal process and yielded exact clones of the original SW pulse. The relative peak output powers of the clone pulses could be adjusted through changes in the pumping power.