Observation of Electron Polarization in Photoemission

Abstract
We have found that photoelectrons from ferromagnetic gadolinium show spin polarization, the preferential direction of the magnetic moment being parallel to the magnetization of the sample. Our experiment yields a degree of polarization P=(5.27±0.70) %. P did not vary significantly over the energy range from 2.8 to 5.0 eV of the incident light.