Thermodynamic geometry of two coupled spins via various Ising Hamiltonians Nayyere Einali Saghavaz, Hosein Mohammadzadeh, Zahra Ebadi and Morteza Nattagh Najafi Eur. Phys. J. Plus, 140 8 (2025) 749 Published online: 11 August 2025 DOI: 10.1140/epjp/s13360-025-06695-1