Field-emitted electrons from EuS-coated W tips cooled to below 21 K show spin polarization of up to (89 ±{} 7)%. The preferential direction of the magnetic moments of the electrons is parallel to the magnetization of the emitter. The high spin polarization is explained in terms of emission from spin-polarized 4f⁷ states of ferromagnetic EuS or in terms of emission assisted by interaction with these states.
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Müller et al. (1972) studied this question.
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