Range and stopping power dependence of heavy ion-induced demagnetizations of ferromagnetic materials

Heavy ion beams induce by their stopping power severe demagnetizations of ferromagnetic materials of dynamic nature, This perturbation of ferromagnetism causes substantial attenuations of transient magnetic fields on traversing probe ions. A striking stopping power dependence has been found when the probe ions are in the H-like charge state. Due to the uncorrelated behaviour of beam ions and probe ions, moving on different trajectories through the ferromagnetic sample, the demagnetization, initially located at the ionization track of the beam ion, must propagate to the region of the probe ion. The determination of the range of demagnetization from its origin was the subject of the present measurements.