  Realizing magnetic skyrmions in two-dimensional (2D) van der Waals (vdW)
ferromagnets offers unparalleled prospects for future spintronic applications.
The room-temperature ferromagnet Fe3GaTe2 provides an ideal platform for
tailoring these magnetic solitons. Here, skyrmions of distinct topological
charges are artificially introduced and spatially engineered using magnetic
force microscopy (MFM). The skyrmion lattice is realized by specific
field-cooling process, and can be further controllably erased and painted via
delicate manipulation of tip stray field. The skyrmion lattice with opposite
topological charges (S = +1 or -1) can be tailored at the target regions to
form topological skyrmion junctions (TSJs) with specific configurations. The
delicate interplay of TSJs and spin-polarized device current were finally
investigated via the in-situ transport measurements, alongside the topological
stability of TSJs. Our results demonstrate that Fe3GaTe2 not only serves as a
potential building block for room-temperature skyrmion-based spintronic
devices, but also presents promising prospects for Fe3GaTe2-based
heterostructures with the engineered topological spin textures.
