Tuning skyrmions in B20 compounds by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>4</mml:mn><mml:mi>d</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>5</mml:mn><mml:mi>d</mml:mi></mml:math> doping

Skyrmion stabilization in novel magnetic systems with the B20 crystal structure is reported here, primarily based on theoretical results. The focus effect of alloying $3d$ sublattice by substitution heavier $4d$ and $5d$ elements, ambition to tune spin-orbit coupling its influence interactions. State-of-the-art methods density functional theory are used calculate both isotropic anisotropic exchange Significant enhancement Dzyaloshinskii-Moriya interaction for $5d$-doped FeSi CoSi, accompanied a large modification spin stiffness spiralization. Micromagnetic simulations coupled atomistic spin-dynamics ab initio interactions reveal spin-spiral nature ground state field-induced skyrmions all these systems. Especially small $\ensuremath{\sim}50\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ predicted ${\mathrm{Co}}_{0.75}{\mathrm{Os}}_{0.25}\mathrm{Si}$, compared $\ensuremath{\sim}148\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ ${\mathrm{Fe}}_{0.75}{\mathrm{Co}}_{0.25}\mathrm{Si}$. Convex-hull analysis suggests that compounds considered here structurally stable at elevated temperatures should be possible synthesize. This prediction confirmed experimentally synthesis structural Ru-doped CoSi discussed powder single-crystal forms.