Dust-magnetoacoustic waves in magnetized dusty plasmas

A new kind of magnetoacoustic wave which is different from the usual compressional hydromagnetic wave (fast Alfven wave) is shown to exist in a magnetized, three component dusty plasma. The ''dust-magnetoacoustic mode'' arises due essentially to the effects which account for the departures from the frozen-in-field approximation for the ion dynamics. Other normal modes in a magnetized dusty plasma are also pointed out. (orig.)