  Topologically non-trivial spin textures, such as skyrmions and dislocations,
display emergent electrodynamics and can be moved by spin currents over
macroscopic distances. These unique properties and their nanoscale size make
them excellent candidates for the development of next-generation logic gates,
race-track memory, and artificial synapses for neuromorphic computing. A major
challenge for these applications - and the investigation of nanoscale magnetic
structures in general - is the realization of detection schemes that provide
high resolution and sensitivity. We study the local magnetic properties of
disclinations, dislocations, and domain walls in FeGe, and reveal a pronounced
response that distinguishes the individual spin textures from the helimagnetic
background. Combination of magnetic force microscopy and micromagnetic
simulations links the non-linear response to the local magnetic susceptibility.
Based on the findings, we propose a read-out scheme using superconducting
micro-coils, representing an innovative approach for detecting topologically
non-trivial spin textures and domain walls in device-relevant geometries.
