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MnBi2nTe3n+1(MBT) is the first intrinsic magnetic topological insulator andis promising to hostemergent phenomena such as quantum anomalous Hall effect.They can be made ferromagnetic by having n >= 4 or with Sb doping. We studiedthe magnetic dynamics in a few selected ferromag-netic (FM) MBT compounds,including MnBi8Te13and Sb doped MnBi2nTe3n+1(n= 2,3) usingAC susceptibility andmagneto-optical imaging. Slow relaxation behavior is observed in allthreecompounds, suggesting its universality among FM MBT. We attribute theorigin of the relaxationbehavior to the irreversible domain movements sincethey only appear below the saturation fieldswhen ferromagnetic domains form.The very soft ferromagnetic domain nature is revealed by thelow-fieldfine-structured domains and high-field sea-urchin-shaped remanent-state domainsimagedvia our magneto-optical measurements. Finally, we ascribe the rare"double-peak" behavior ob-served in the AC susceptibility under small DC biasfields to the very soft ferromagnetic domainformations.

Unusual dynamic susceptibility arising from soft ferromagnetic domains in MnBi8Te13 and Sb-doped MnBi2nTe3n+1 (n=2, 3)