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3. 3) As the spin-orbit interaction induce the mixing of up-spin and down-spin electrons, it is impossible to obtain the spintronics devise of complete (100%) spin-polarization. However, it was shown by Marvropoulos et al. (Phys. Rev. B 69 (2004), 054424) that the effect due to the spin-orbit interaction is very small for the materials such as 3d element-based alloys. For example, the 100% spin-polarization for the NiMnSb, obtained by the calculations without the spin-orbit interaction, decreases only by ∼1% by taking into account the spin-orbit interaction.
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