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We have measured the temperature dependence P(T) of the electron spin polarization of field emitted electrons from a W-EuS-vacuum junction. The shapes of the P(T) curves depend strongly on the annealing temperature of the EuS layer. Annealed at some temperature between 300°C and 600°C the polarization drops to zero at about 16 ± 2 K.doi:10.1016/0304-8853(76)90004-4 fatcat:lmv5qo7etvgrjd3tjwgicqt74u