We demonstrate an efficient mechanism for generating magnetic fields in turbulent, collisionless plasmas. By using
fully kinetic, particle-in-cell simulations of an initially nonmagnetized plasma, we inspect the genesis of
magnetization, in a nonlinear regime. The complex motion is initiated via a Taylor–Green vortex, and the plasma
locally develops strong electron temperature anisotropy, due to the strain tensor of the turbulent flow.
Subsequently, in a domino effect, the anisotropy triggers a Weibel instability, localized in space. In such active
wave–particle interaction regions, the seed magnetic field grows exponentially and spreads to larger scales due to
the interaction with the underlying stirring motion. Such a self-feeding process might explain magnetogenesis in a
variety of astrophysical plasmas, wherever turbulence is present.
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