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The field of topological electronic materials has seen rapid growth in recentyears, in particular with the increasing number of weakly interacting systemspredicted and observed to host topologically non-trivial bands. Given the broadappearance of topology in such systems, it is expected that correlatedelectronic systems should also be capable of hosting topologically non-trivialstates. Interest in correlated platforms is heightened by the prospect thatcollective behavior therein may give rise to new types of topological statesand phenomena not possible in non-interacting systems. However, to date only alimited number of correlated topological materials have been definitivelyreported due to both the challenge in calculation of their electronicproperties and the experimental complexity of correlation effects imposed onthe topological aspects of their electronic structure. Here, we report a deHaas-van Alphen (dHvA) study of the recently discovered kagome metalFe$_3$Sn$_2$ mapping the massive Dirac states strongly coupled to the intrinsicferromagnetic order. We observe a pair of quasi-two-dimensional Fermi surfacesarising from the massive Dirac states previously detected by spectroscopicprobes and show that these band areas and effective masses are systematicallymodulated by the rotation of the ferromagnetic moment. Combined withmeasurements of Berry curvature induced Hall conductivity, we find that alongwith the Dirac fermion mass, velocity, and energy are suppressed with rotationof the moment towards the kagome plane. These observations demonstrate thatstrong coupling of magnetic order to electronic structure similar to thatobserved in elemental ferromagnets can be extended to topologically non-trivialelectronic systems, suggesting pathways for connecting topological states torobust spintronic technologies.

de Haas-van Alphen effect of correlated Dirac states in kagome metal Fe3Sn2