Effects of low ion dose on SE imaging and orientation dependent Ga-ion channeling
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms(2015)
Abstract
Grain contrasts produced during ion induced secondary electron imaging depend upon grain orientation and ability of Ga-ion beam to channel in it. The current study aims to investigate critical Ga-ion dose for Ni-alloy where a transition from grain surface imaging to sputtering dominated Ga-ion channeling occurs. It is observed that critical dose is in the vicinity of 1015ions/cm2. Strong orientation dependent Ga-ion channeling effects were observed at dose values higher than 1017ions/cm2. When a normalized orientation dependent grain transparency factor was estimated for each grain in a limited sampling volume, it was observed that despite low sampling volume for a random polycrystalline orientations and variation in Ga-ion dose, the range of sputter depth variation during Ga-ion channeling remains above 80% indicating dose or sampling volume (for randomly oriented poly-crystals) independency in the sputter dominated dose region. This study attempts to establish a correlation between high resolution imaging, applied Ga-ion dose and orientation dependent Ga-ion beam channeling effects.
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Key words
Ga-ion channeling,Sputtering,EBSD,Grain orientation
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