Altermagnets represent a new class of magnetic materials that uniquely combine the advantages of ferromagnets (spin polarization of electric currents) and antiferromagnets (robustness against magnetic fields and ultrafast spin dynamics). As part of an international collaboration, we have experimentally discovered one of the very first and still rare altermagnets, Mn5Si3, thereby opening the way for new fundamental and applied research. Until now, Mn5Si3 has mainly been synthesized by molecular beam epitaxy, a high-precision technique but one that presents limitations for broader studies. Our goal is to develop the growth of Mn5Si3 using high-temperature sputtering, a more versatile and industry-compatible method, in order to explore and demonstrate its exceptional spin properties.