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Particles of the FePt intermetallic compound with L10 structure embedded in silica films were submitted to irradiation by 120 MeV Au ions at different fluences. Observations by transmission electron microscopy evidenced an elongation of the particles, ascribed to an anisotropic ripening process during the thermal spikes occurring in the wake of the ions. However, the observed changes in the magnetic properties are attributed to the magnetostriction of the particles. Their compression by the matrix induces a tilt of easy magnetization axis from in-plane to perpendicular to the film surface, together with an increase in coercivity.