Ion beam-generated surface ripples: new insight in the underlying mechanism
1 Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110067, India
2 Indian Institute of Technology Delhi Hauz-Khas, New Delhi, 110016, India
3 UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452017, India
Nanoscale Research Letters 2013, 8:336 doi:10.1186/1556-276X-8-336Published: 26 July 2013
A new hydrodynamic mechanism is proposed for the ion beam-induced surface patterning on solid surfaces. Unlike the standard mechanisms based on the ion beam impact-generated erosion and mass redistribution at the free surface (proposed by Bradley-Harper and its extended theories), the new mechanism proposes that the incompressible solid flow in amorphous layer leads to the formation of ripple patterns at the amorphous-crystalline (a/c) interface and hence at the free surface. Ion beam-stimulated solid flow inside the amorphous layer probably controls the wavelength, whereas the amount of material transported and re-deposited at a/c interface control the amplitude of ripples.