Spin polarization of nucleons: Limits of low and high temperatures

Abstract

The problem of explaining the origin of the magnetic fields of white dwarfs with hydrogen envelopes and of type II supernovae via the spin polarization of nucleons is considered. The question of the ferromagnetism of an electron-nucleon system with contact nuclear spin-isospin-dependent interaction is considered at densities two and more orders of magnitude lower than the nuclear saturation density at high and low temperatures using the minimum of energy density at finite degrees of spin polarization and the Stoner criterion. The importance of considering Coulomb exchange and correlation energy is shown. The initiation of spin polarization is found to be energetically advantageous at proton and neutron densities on the orders of 1030–1031 cm−3 and 1035–1036 cm−3. The first region of densities is shown to exist due to the Coulomb exchange energy, the effect of which is reduced by the Coulomb correlation energy.