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We report on the structural, magnetic, and electron transport properties of aL1o-ordered epitaxial iron-platinum alloy layer fabricated bymagnetron-sputtering on a MgO(001) substrate. The film studied displayed a longrange chemical order parameter of S~0.90, and hence has a very strongperpendicular magnetic anisotropy. In the diffusive electron transport regime,for temperatures ranging from 2 K to 258 K, we found hysteresis in themagnetoresistance mainly due to electron scattering from magnetic domain walls.At 2 K, we observed an overall domain wall magnetoresistance of about 0.5 %. Byevaluating the spin current asymmetry alpha = sigma_up / sigma_down, we wereable to estimate the diffusive spin current polarization. At all temperaturesranging from 2 K to 258 K, we found a diffusive spin current polarization of >80%. To study the ballistic transport regime, we have performed point-contactAndreev-reflection measurements at 4.2 K. We obtained a value for the ballisticcurrent spin polarization of ~42% (which compares very well with that of apolycrystalline thin film of elemental Fe). We attribute the discrepancy to adifference in the characteristic scattering times for oppositely spin-polarizedelectrons, such scattering times influencing the diffusive but not theballistic current spin polarization.

Diffusive and ballistic current spin-polarization in magnetron-sputtered L1o-ordered epitaxial FePt