New developments in transient field measurements

New data for electron polarization were obtained in transient field (TF) measurements for H-like ions at high velocities. Spin-exchange scattering calculations with the polarized electrons in bound states of the ferromagnetic host atoms are successful for explaining experimental data. The deteriorating effect of ion-beam-induced perturbations on the TF strength in ferromagnetic materials has been studied systematically. Concepts for its control or elimination are introduced and discussed.