A detailed $3d$ band structure of ferromagnetic Ni is incorporated into a calculation of the electron spin polarization in field emission from the (100) crystal plane. In agreement with a recent experiment of Gleich, Regenfus, and Sizmann, the calculated electron spin polarization is found to -4%, with the preferred spin direction parallel to the magnetization of the crystal.

• Received 7 February 1972

DOI:https://doi.org/10.1103/PhysRevLett.28.1330