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Magnetic topological insulators (MTIs) have received a lot of attention dueto the existence of various quantum phenomena such as quantum anomalous Halleffect (QAHE) and topological magnetoelectric effect, etc. The intrinsicsuperlattice-like layered MTIs, MnBi2Te4/(Bi2Te3)n, have been extensivelyinvestigated mainly through the transport measurements, while the directinvestigation of their superlattice-sensitive magnetic behaviors is relativelyrare. Here, we report a microscopic real-space investigation of magnetic phasebehaviors in MnBi4Te7 using cryogenic magnetic force microscopy (MFM). Theintrinsic robust A-type antiferromagnetic (AFM), and emerged surface spin-flop(SSF), canted AFM (CAFM), ferromagnetic (FM)+CAFM, forced FM phases aresequentially visualized via the increased external magnetic field, in agreementwith the metamagnetic behavior in the M-H curve. The temperature-dependentmagnetic phase evolution behaviors are further investigated to obtain thecomplete H-T phase diagram of MnBi4Te7. The tentative local phase manipulationvia the stray field of the magnetic tip is demonstrated by transforming the AFMto FM phase in its surface layers of MnBi4Te7. Our study the not only providekey real-space ingredients for understanding their complicated magnetic,electronic, and topological properties of these intrinsic MTIs, but alsosuggest new directions for manipulating spin textures and locally controllingtheir exotic properties.

Coexisting Ferromagnetic-antiferromagnetic Phase and Manipulation in Magnetic Topological Insulator MnBi4Te7