  To commercialize stable, highly-integrated, and low-power-consuming magnetic
memories of skyrmions, stable control of their motion is crucial. Manipulating
the inter-skyrmion interactions is key to achieving this goal. We find that
distortion of the skyrmion shape can induce the interskyrmion attraction
between atomic-scale small skyrmions, similar to larger skyrmions. Also, the
interaction of smaller skyrmions reaches further, when scaled by the skyrmion
size, than that of larger skyrmions. The continuum model is still capable of
explaining the behavior. Moreover, the formation of the magnetic domains
between skyrmions also induces attraction, which is again the same mechanism as
larger skyrmions. This study contributes to better control of the skyrmion
motion with a wide range of their sizes.
