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We present theoretical predictions of spintronic transport phenomena thatshould be observable in ferromagnetic Fe nanocontacts bridged by chains of Featoms. We develop appropriate model Hamiltonians based on semi-empiricalconsiderations and the known electronic structure of bulk Fe derived from abinitio density functional calculations. Our model is shown to provide asatisfactory description of the surface properties of Fe nano-clusters as wellas bulk properties. Lippmann-Schwinger and Green's function techniques are usedtogether with Landauer theory to predict the current, magneto-resistance, andspin polarization of the current in Fe nanocontacts bridged by atomic chainsunder applied bias. Unusual device characteristics are predicted includingnegative magneto-resistance and spin polarization of the current, as well asspin polarization of the current for anti-parallel magnetization of the Fenanocontacts under moderate applied bias. We explore the effects thatstretching the atomic chain has on the magneto-resistance and spin polarizationand predict a cross-over regime in which the spin polarization of the currentfor parallel magnetization of the contacts switches from negative to positive.We find resonant transmission due to dangling bond formation on tip atoms asthe chain is stretched through its breaking point to play an important role inspin-dependent transport in this regime. The physical mechanisms underlying thepredicted phenomena are discussed.Comment: 13 pages, 6 figures, Accepted for publication in Physical Review

Theoretical study of spin-dependent electron transport in atomic Fe nanocontacts