Abstract
It is shown that the presence of equilibrium density gradients in a magnetized dusty plasma can introduce new types of drift-like waves. These give rise to oscillatory wake-potentials, which can focus ions and attract dust grains of similar polarity. Using a test particle approach, typical profiles for wake-potentials are obtained in several interesting cases. It is found that the effective attraction length is independent of the magnetic field strength for high density dusty plasmas, whereas it is larger for larger magnetic fields in a low-density dusty plasma. Furthermore, the dust attraction takes place predominantly in the inhomogeneous region of the dusty plasma having smaller lattice periodicity for smaller scale length of the density inhomogeneity.
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