Density waves were studied in a phase-separated binary complex plasma under microgravity conditions. For the big particles, waves were self-excited by the two-stream instability, while for small particles, they were excited by heartbeat instability with the presence of reversed propagating pulses of a different frequency. By studying the dynamics of wave crests at the interface, we recognize a collision zone and a merger zone before and after the interface, respectively. The results provide a generic picture of wave-wave interaction at the interface between two mediums.
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