Three-strands helical shell structures of M19 (M=Fe, Co, and Ni) nanowires (NWs) are obtained by means of
the molecular dynamics (MD) method. The magnetic, optical and electrical transport properties of NWs are investigated.
The electronic transport properties of optimized NWs sandwiched between two gold electrodes are investigated using
non-equilibrium Green´s function (NEGF) formalism. The DOS, transmission functions (T-E), current-voltage (I-V)
characteristics, and conductance spectra (G-V) were analyzed in detail. The optical properties of NWs were studied using
density functional theory (DFT) calculations. The variation curves of reflectivity R(ω), absorption I(ω), refractive index
n(ω), dielectric function ε(ω), conductivity δ (ω) and Loss function L(ω) as the frequency were discussed. The magnetic
properties were investigated within non-spin-polarized (NSP) and spin-polarized (SP) ab initio calculation. The density of
states (DOS) and electron density difference were also obtained. The calculations indicate that the Co19 NWs have
potential to develop electronic, optical and spin-polarized transport nanodevice.