  The discovery of a superconducting dome in the proximity of the magnetic to
paramagnetic transition in the electronic phase diagram of MnP as a function of
hydrostatic pressure has renewed the interest in the magnetic properties of
this binary pnictide. Here we present an ab initio study obtained with Density
Functional Theory (DFT) simulations as a function of pressure. We show that the
itinerant-electron magnetism of MnP is well characterized by the mean-field
Kohn-Sham method which correctly describes the ambient pressure magnetic
states, the anomalous trend of the lattice parameters as a function of pressure
and the critical pressure for the disappearance of the magnetic order. We are
finally able to confirm the nature of the new helical structure observed at
high pressure.
