  Optical skyrmions have recently been constructed by tailoring electric or
spin field distributions through the interference of multiple surface plasmon
polaritons, offering promising features for advanced information processing,
transport and storage. Here, we construct topologically robust plasmonic
skyrmions in a wisely tailored space-coiling meta-structure supporting magnetic
localized spoof plasmons (LSPs), which are strongly squeezed down to
{\lambda}3/106 and do not require stringent external interference conditions.
By directly measuring the spatial profile of all three vectorial magnetic
fields, we reveal multiple {\pi}-twist target skyrmion configurations mapped to
multi-resonant near-equidistant LSP eigen-modes. The real-space topological
robustness of these skyrmion configurations is confirmed by arbitrary
deformations of the meta-structure, demonstrating flexible skyrmionic textures
with arbitrary shapes. The observed magnetic LSP skyrmions pave the way to
ultra-compact and topologically robust plasmonic devices, such as flexible
sensors, wearable electronics and ultra-compact antennas.
