Surface spin polarization in Fe(110) and Ni(110)

Local Spin Polarization at Surfaces Probed by Hollow Atoms

“…In order to determine the sign of the polarization, a complementary ECS measurement was performed while the sample was kept in a state of single-domain remanent magnetization. The sign of the SSP turns out to be negative [14]. Using the sign information, we obtain from the MECS measurements a value for the SSP of ÿ90 7% at room temperature.…”

“…The He 2 and N 6 ions that we have used, have been produced in an electron cyclotron resonance ion source and after charge-over-mass separation guided into our setup, which is described in more detail elsewhere [14]. In order to decelerate the ions down to energies of a few tens of eV, the setup is floated on high voltage, the final ion energy being determined by the difference between the source and the setup voltages, plus a small contribution due to the plasma potential.…”

“…To check that the surface does not show magnetic ordering on a macroscopic scale we did electron capture spectroscopy using 14 keV He 2 ions and detecting the He1s3d 3 D ! He1s2p 3 P triplet line at 587.5 nm [14]. Target temperatures up to 375 K could be used in order not to have the radiation of the heating filament interfere with the detection of the light emitted by the neutralized ions.…”