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It is well known that there are two types of magnetic bubbles in uniaxialmagnets. Here, using Lorentz-transimission electronic microscopy magneticimaging, we report the direct experimental observation of 3D type-III hybridbubbles, which comprise N\'eel-twisted skyrmion bubbles with topological chargeQ = -1 in near-surface layers and type-II bubbles with Q = 0 in interiorlayers, in Fe3Sn2 nanodisks. Using the tilted magnetic field, we further showthe controlled topological magnetic transformations of three types of bubblesin a confined ferromagnetic nanodisk. Our observations are well reproducedusing micromagnetic simulations based on measured magnetic parameters. Ourresults advance fundamental classification and understanding of magneticbubbles, which could propel the applications of three-dimensional magnetism.

Observation of Hybrid Magnetic Skyrmion Bubbles in Fe3Sn2 Nanodisks