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This work presents a comparative study of magnetization reversal and domain structures in amorphous Fe-Co-Ni-Si and Fe-Ni-Si-C ribbons using magneto-optical Kerr effect (MOKE) microscopy and spectroscopy. Surface hysteresis loops and domain images reveal clear differences in magnetic anisotropy and switching mechanisms depending on composition. Variations in carbon and cobalt content affect domain size, mobility, and reversal type. The results highlight the role of local structure and composition in shaping magnetic behavior and demonstrate the effectiveness of MOKE methods for surface-sensitive magnetic analysis.