Laser-induced plasma deposition of magnesium alloys for surface structuring and thin-film coating: A comparison of with and without of Transverse Agnetic Field (TMF)
Asadullah Dawood
National Excellence Institute, Pakistan
: Res J Opt Photonics
Abstract
This research investigates the impact of a Transverse Magnetic Field (TMF) of 1.1 tesla on Laser-Induced Breakdown Spectroscopy (LIBS) of Mg-alloy plasma. An Nd: YAG laser (1064 nm, 10 ns) with an intensity of 2 GW/cm2 was used to generate the Mg plasma. At pressures ranging from 1 to 100 Torr, inert gases of Ar, Ne, and He were pumped in as atmosphere fill. Using a spectrometer, we were able to identify the optical emission spectra of the laser-generated plasma and calculate its electron temperature (Te) and electron number density (ne). Under all experimental circumstances, including those with various ambient gases at variable pressures and time delays (0.42 s-9.58 s), an increase in the Te and ne of the Mg plasma was seen when TMF was present. The thermal beta (βt) values were used to analytically analyze plasma confinement by applied TMF, and they were found to be 1 in all cases. For Mg-alloy plasma, the best results were achieved with ambient Ar in TMF whereas the worst results were obtained with He gas in the absence of TMF. Laser-ablated Mg alloy in the presence and absence of TMF was analyzed using SEM to evaluate the surface structure. Cone formation, cavities, and nonuniform melting were shown to be major aspects of ambient Ar, whereas spike formation and cavity creation were found to be typical of Ne gas settings. When ambient He is present, the dendrites and spikes take on a distinctive conical shape. Clearly distinguishable and well-defined structures were seen when TMF was present, in contrast to the field-free condition. The surface structure of Mg alloy may be modified by adjusting the LPP parameters. Thin film deposition, multilayer coatings, and ion implantation/doping all benefit greatly from LPP thanks to its optimized and enhanced settings.
Biography
Asadullah Dawood has completed his PhD at the age of 30 years from Government College University Lahore and University of Waterloo Canada and postdoctoral studies from Advanced Materials Research & Laser Technologies (AMRELAT) Laboratory in the Department of Physics at School of Sciences and Humanities, Nazarbayev University, Nur Sultan Kazaqstan. He is the Head of Physics department of National Excellence Institute (University), Islamabad, a private organization. He has published more than 16 papers in reputed journals.
