Spin Transport in Ferromagnetic Metals

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Abstract
Ferromagnetism is a collective phenomenon, but some properties of ferromagnetic metals can be well understood in terms of a single-particle band picture. We investigate transport phenomena in ferromagnetic metals by means of a simple, solvable model in which the magnetic electrons are independent except for spin-spin correlations generated by an effective exchange field similar to a molecular field. The explicit solution shows that spin transport is reduced to negligible proportions, while charge transport remains the same as in the independent-particle case.