Dr. Alexandros Barnasas is a Postdoctoral Researcher at the Department of Physics and Astronomy, Uppsala University, specializing in experimental materials physics with a focus on magnetic thin films, amorphous alloys, and nanoscale systems. His research addresses growth–structure–property relationships, finite - size effects, structural disorder, and phase transitions in low-dimensional materials, aligning with advances in thin-film and surface deposition. He has extensive expertise in thin-film fabrication via ultra-high vacuum (UHV) magnetron sputtering and in advanced characterization techniques, including polarized neutron reflectometry and cryogenic magneto-optical Kerr effect (MOKE) measurements, as well as experience from large-scale facilities such as the Institut Laue-Langevin (ILL). He is author or co-author of 15 peer-reviewed publications (220+ citations, h-index 7). He obtained his BSc, MSc, and PhD in Materials Science and Nanotechnology from the University of Patras, where his doctoral research focused on metal-oxide thin films, including the investigation of finite-size effects, band gap determination, and optoelectronic properties through techniques such as UV-Vis spectroscopy and photoluminescence. His current work expands toward magnetic systems, exploring emergent phenomena driven by reduced dimensionality and disorder.