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MnBi$_{2}$Te$_{4}/$(Bi$_{2}$Te$_{3}$)$_{n}$ materials system has recentlygenerated strong interest as a natural platform for realization of the quantumanomalous Hall (QAH) state. The system is magnetically much better ordered thansubstitutionally doped materials, however, the detrimental effects of certaindisorders are becoming increasingly acknowledged. Here, from compilingstructural, compositional, and magnetic metrics of disorder in ferromagneticMnBi$_{2}$Te$_{4}/$(Bi$_{2}$Te$_{3}$)$_{n}$ it is found that migration of Mnbetween MnBi$_{2}$T$e_{4}$ septuple layers (SLs) and otherwise non-magneticBi$_{2}$Te$_{3}$ quintuple layers (QLs) has systemic consequences - it inducesferromagnetic coupling of Mn-depleted SLs with Mn-doped QLs, seen inferromagnetic resonance as an acoustic and optical resonance mode of the twocoupled spin subsystems. Even for a large SL separation (n $\gtrsim$ 4 QLs) thestructure cannot be considered as a stack of uncoupled two-dimensional layers.Angle-resolved photoemission spectroscopy and density functional theory studiesshow that Mn disorder within an SL causes delocalization of electronwavefunctions and a change of the surface bandstructure as compared to theideal MnBi$_{2}$Te$_{4}/$(Bi$_{2}$Te$_{3}$)$_{n}$. These findings highlight thecritical importance of inter- and intra-SL disorder towards achieving new QAHplatforms as well as exploring novel axion physics in intrinsic topologicalmagnets.

Systemic Consequences of Disorder in Magnetically Self-Organized Topological MnBi$_{2}$Te$_{4}/$(Bi$_{2}$Te$_{3}$)$_{n}$ Superlattices