  In magnetic Weyl semimetals, where magnetism breaks time-reversal symmetry,
large magnetically sensitive anomalous transport responses are anticipated that
could be useful for topological spintronics. The identification of new magnetic
Weyl semimetals is therefore in high demand, particularly since in these
systems Weyl node configurations may be easily modified using magnetic fields.
Here we explore experimentally the magnetic semimetal PrAlGe, and unveil a
direct correspondence between easy-axis Pr ferromagnetism and anomalous Hall
and Nernst effects. With sizes of both the anomalous Hall conductivity and
Nernst effect in good quantitative agreement with first principles
calculations, we identify PrAlGe as a system where magnetic fields can connect
directly to Weyl nodes via the Pr magnetization. Furthermore, we find the
predominantly easy-axis ferromagnetic ground state co-exists with a low density
of nanoscale textured magnetic domain walls. We describe how such nanoscale
magnetic textures could serve as a local platform for tunable axial gauge
fields of Weyl fermions.
