Abstract
The magnetic screening of localized excitations in Ni and Fe ferromagnetic metal hosts has been investigated by magnetic circular dichroism of inelastic x-ray resonant scattering in perpendicular geometry at the Ni L2,3 absorption region. The method probes the spin-dependent screening by the electron population initially in thermodynamic equilibrium. A screening time constant of 1.5 fs in Ni metal has been reported in literature. Here an upper limit of 150 as is set for the screening time constant in Fe metal by measuring the scattering from Ni impurities in dilute Fe metal. The present time scale is among the shortest experimentally investigated in magnetic phenomena.
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