Abstract
A spin-dependent generalization of the Appelbaum-Brinkman transfer-Hamiltonian method is used to develop a practical formalism for including many-body and spin-dependent surface-potential effects in the calculation of the field-emitted current from a ferromagnet. It is shown that this formalism reduces to that of Politzer and Cutler when many-body effects, the spin dependence of the surface potential, and the detailed position dependence of the surface potential are neglected. If, finally, the band structure is treated in the nearly-free-electron limit, the theory reduces to that of Chazalviel and Yafet.
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