Profiles of the poloidal magnetic field, B_r, and the toroidal magnetic field, B_ϕ, generated by the ST dynamo in the donor star at different evolutive stages. The profiles represents the stages of inversion of the ¹H/⁴He ratio (X₁ stage), the initiation of mass transfer (E stage), the mass inversion (U₁ stage), and the current stage (X₂ stage). The Eulerian diffusion coefficient for mixing is shown in orange, the ST diffusion coefficient as a brown line, the poloidal magnetic field in black, the toroidal magnetic field in green, the angular momentum in blue, and the angular velocity in red.