Effect of irradiation with argon ions on elastic scattering of spin-polarized electrons from W(110) surface

Satyanarayan Dhal, Shyamal Chatterjee, Sergey Samarin, James F. Williams, Franz Giebels, Herbert Gollisch, Roland Feder
2015 Radiation effects and defects in solids (Print)  
The energy and azimuthal angle dependencies of the asymmetry of spin-polarized low-energy electrons ((00) beam) elastically scattered from a W(110) surface, have been studied before and after irradiated with slow Ar + ions with energies of 200 eV, 500 eV and 1 keV at a fluence of 5 × 10 15 ions/cm 2 . The energy dependence of the scattered electron asymmetries and intensities (for a fixed azimuthal angle of 55°, which is determined by the angle between the normal to the scattering plane and the
more » ... ering plane and the [110] direction in the surface of the W(110) crystal) and the azimuthal angle dependence of the asymmetry for two different incident electron energies of 14 eV and 23 eV showed a significant change after irradiation. The low-energy ion irradiation influenced the spin-polarized electron scattering more than the higher energy ions. The reason for the change of spin-dependent electron scattering is a quenching of coherent elastic multiple scattering, mainly due to lattice defects induced by implanted ions. Thus, these modifications demonstrate a technological way to construct spin-active interface with required properties. The agreement between experimental results and theoretical ones with and without multiple scattering provides a consistent explanation of the observations.
doi:10.1080/10420150.2015.1010168 fatcat:qgci7ruuwjbx5huudnhj7vrvwe