On-Surface Synthesis of a Ferromagnetic Molecular Spin Trimer - Alessio Vegliante; Manuel Vilas-Varela; Ricardo Ortiz; Francisco Romero Lara; Manish Kumar; Lucía Gómez-Rodrigo; Stefano Trivini; Fabian Schulz; Diego Soler-Polo; Hassan Ahmoum; Emilio Artacho; Thomas Frederiksen; et al. (Journal of the American Chemical Society, 2025)