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We have imaged N\'eel skyrmion bubbles in perpendicularly magnetisedpolycrystalline multilayers patterned into 1 \mu m diameter dots, usingscanning transmission x-ray microscopy. The skyrmion bubbles can be nucleatedby the application of an external magnetic field and are stable at zero fieldwith a diameter of 260 nm. Applying an out of plane field that opposes themagnetisation of the skyrmion bubble core moment applies pressure to the bubbleand gradually compresses it to a diameter of approximately 100 nm. On removingthe field the skyrmion bubble returns to its original diameter via a hystereticpathway where most of the expansion occurs in a single abrupt step. Thiscontradicts analytical models of homogeneous materials in which the skyrmioncompression and expansion are reversible. Micromagnetic simulationsincorporating disorder can explain this behaviour using an effective thicknessmodulation between 10 nm grains.

Pinning and hysteresis in the field dependent diameter evolution of skyrmions in Pt/Co/Ir superlattice stacks