Spin polarization of secondary electrons from amorphous3dmetallic ferromagnets

It is shown that the spin polarization of secondary electrons from Fe-Ni-based metallic glasses (${\mathrm{Fe}}_{82}$ ${\mathrm{B}}_{12}$ ${\mathrm{Si}}_6$, ${\mathrm{Fe}}_{60}$ ${\mathrm{Ni}}_{20}$ ${\mathrm{B}}_{20}$, ${\mathrm{Fe}}_{44}$ ${\mathrm{Ni}}_{37}$ ${\mathrm{B}}_{19}$) in the energy range of 10-20 eV directly reflects the bulk magnetization of the material. All samples show a strong spin-polarization enhancement at low secondary energy (< 10 eV). No additional structure is observed for these amorphous materials, contrary to single crystals where the spin polarization is affected by band-structure (low-energy electron diffraction) effects.