  We report the observation of stationary turbulence in antiferromagnetic
spin-1 Bose-Einstein condensates driven by a radio-frequency magnetic field.
The magnetic driving injects energy into the system by spin rotation and the
energy is dissipated via dynamic instability, resulting in the emergence of an
irregular spin texture in the condensate. Under continuous driving, the spinor
condensate evolves into a nonequilibrium steady state with characteristic spin
turbulence, while the low energy scale of spin excitations ensures that the
sample's lifetime is minimally affected. When the driving strength is on par
with the system's spin interaction energy and the quadratic Zeeman energy,
remarkably, the stationary turbulent state exhibits spin-isotropic features in
spin composition and spatial spin texture. We numerically show that ambient
field fluctuations play a crucial role in sustaining the turbulent state within
the system. These results open up new avenues for exploring quantum turbulence
in spinor superfluid systems.
