Experimental concept. (a) Consider a superconductor (SC)/ferrimagnetic insulator (FI) bilayer sample. By applying an in-plane external magnetic field, H, parallel to the y-axis and larger than the magnetization saturation field of the ferrimagnetic insulator (FI), the magnetization of FI (YIG) aligns in the same direction as the field, and magnetic domains disappear. (b) By withdrawing H from (a), perpendicularly magnetized stripes along the initially applied field direction appear in the FI layer. (c) A close-up view of (b). Superconducting vortices are created above the stripes which illustrated as confining potential for vortices. Lorentz force, F, acting on the vortices is perpendicular to the bias current. (d–f) Stripe and vortex configurations when H is applied parallel to the x-axis. (g) Measurement setup of the present study. The sample is a YIG/NbN bilayer film. An in-plane magnetic field, H, is applied at a relative angle, α, to the current direction. (h) Temperature (T) dependence of ρ for the YIG/NbN sample at H = 0. The thermodynamic superconducting transition temperature and the zero resistance temperature are denoted as Tc, and Tc0, respectively. The inset shows the T dependence of ρ up to 300 K.