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We report the critical role of La doping in the topological Hall effectobserved in LaxEu1-xO thin films (~ 50 nm) grown by molecular beam epitaxy.When the La doping exceeds 0.036, topological Hall effect emerges, which weattribute to the formation of magnetic skyrmions. Besides, the La doping isfound to play a critical role in determining the phases, densities, and sizesof the skyrmions in the LaxEu1-xO thin films. The maximum region of theskyrmion phase diagram is observed on the La0.1Eu0.9O thin film. As the Ladoping increases, the skyrmion density increases while the skyrmion sizedecreases. Our findings demonstrate the important role of La doping for theskyrmions in EuO films, which could be important for future studies of magneticskyrmions in Heisenberg ferromagnets.

Role of La doping for Topological Hall Effect in Epitaxial EuO Films