Magnetic structure determination and refinement using FullProf

| Step | Action | |------|--------| | 1 | Start with correct zero shift, scale, and background. | | 2 | Refine lattice parameters only. | | 2 | Add profile parameters (U, V, W – Caglioti). | | 3 | Refine atomic coordinates (if needed). | | 4 | Refine thermal factors (Biso). | | 5 | Refine occupancy (only for mixed sites). | | 6 | Check Rwp , Rexp , GoF (chi²). |

The core refinement engine that processes input files to perform least-squares fitting of diffraction profiles.