  A fundamental property of particles and antiparticles, such as electrons and
positrons, is their ability to annihilate one another. Similar behavior is
predicted for magnetic solitons -- localized spin textures that can be
distinguished by their topological index $Q$. Theoretically, magnetic
topological solitons with opposite values of $Q$, such as skyrmions and their
antiparticles -- antiskyrmions -- are expected to be able to merge continuously
and to annihilate. However, experimental verification of such
particle-antiparticle pair production and annihilation processes has been
lacking. Here, we report the creation and annihilation of skyrmion-antiskyrmion
pairs in an exceptionally thin film of the cubic chiral magnet B20-type FeGe
observed using transmission electron microscopy. Our observations are highly
reproducible and are fully consistent with micromagnetic simulations. Our
findings provide a new platform for fundamental studies of particles and
antiparticles based on magnetic solids and open new perspectives for practical
applications of thin films of isotropic chiral magnets.
